CN114867544A

CN114867544A - Exhaust gas treatment device

Info

Publication number: CN114867544A
Application number: CN202180007543.4A
Authority: CN
Inventors: 糸川和芳; 中川匡
Original assignee: Fuji Electric Co Ltd
Current assignee: Fuji Electric Co Ltd
Priority date: 2020-07-15
Filing date: 2021-05-24
Publication date: 2022-08-05
Also published as: WO2022014165A1; JPWO2022014165A1; KR20220100075A

Abstract

The present invention provides an exhaust gas treatment device, including: a reaction tower that introduces an exhaust gas containing sulfur, introduces a liquid for treating the exhaust gas, and discharges a waste liquid containing sulfur, which is a waste liquid obtained by treating the exhaust gas; a storage section that stores at least a part of the waste liquid discharged from the reaction tower; and a calculation unit that calculates the amount of the waste liquid stored in the storage unit, the calculation unit calculating the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the waste liquid.

Description

Exhaust gas treatment device

Technical Field

The present invention relates to an exhaust gas treatment device.

Background

Conventionally, there is an exhaust gas treatment device that removes foreign matter contained in a liquid in which exhaust gas is treated (see, for example, patent documents 1 and 2).

Patent document 1: japanese patent laid-open publication No. 2019-118903

Patent document 2: japanese patent laid-open No. 2017-6883

Technical problem to be solved by the invention

In the exhaust gas treatment device, it is preferable to suppress the generation of foreign matter in the liquid in which the exhaust gas is treated.

Disclosure of Invention

A first aspect of the present invention provides an exhaust gas treatment device. The waste gas treatment device comprises a reaction tower for introducing waste gas containing sulfur, introducing liquid for treating the waste gas and discharging waste liquid containing sulfur, wherein the waste liquid is waste liquid after the waste gas is treated; a storage unit for storing at least a part of the waste liquid discharged from the reaction tower; and a calculation unit for calculating the amount of waste liquid stored in the storage unit. The calculation unit calculates the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the waste liquid.

The exhaust gas treatment device may further include a first sulfur concentration measuring unit that measures the sulfur concentration of the exhaust gas after the liquid treatment. The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the waste gas measured by the first sulfur concentration measurement unit.

The first sulfur concentration measuring unit may further measure the sulfur concentration of the exhaust gas introduced into the reaction tower. The calculator may calculate the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the waste gas after the liquid treatment and the sulfur concentration of the waste gas introduced into the reaction tower.

The reaction tower may include an exhaust gas discharge port that discharges the liquid-treated exhaust gas. The first sulfur concentration measuring portion may be provided at the exhaust gas outlet.

The exhaust gas treatment device may further include a gas flow rate measurement unit that measures the flow rate of the exhaust gas. The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on the flow rate of the waste gas measured by the gas flow rate measurement unit.

The exhaust gas treatment device may further include a power unit for discharging the exhaust gas, and a consumption amount measuring unit for measuring a consumption amount of fuel of the power unit. The calculation unit may calculate the amount of waste liquid stored in the storage unit based on the amount of fuel consumed by the consumption measurement unit.

The exhaust gas treatment device may further include a second sulfur concentration measurement unit that measures the sulfur concentration of the fuel. The calculation unit may calculate the amount of waste liquid stored in the storage unit based on the amount of consumption of the fuel measured by the consumption amount measurement unit and the sulfur concentration of the fuel measured by the second sulfur concentration measurement unit.

The exhaust gas treatment device may further include an output measurement unit that measures an output of the power unit. The calculation unit may calculate the amount of waste liquid stored in the storage unit based on the output of the power unit measured by the output measurement unit.

The exhaust gas treatment device may further include a conductivity measurement section that measures an electrical conductivity of the waste liquid. The electrical conductivity of the spent liquor may vary based on the sulfur concentration of the spent liquor. The calculation section may calculate the amount of the waste liquid stored in the storage section based on a waveform indicating a temporal change in electrical conductivity of the waste liquid.

The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on a time rate of change indicating the electrical conductivity of the waste liquid.

The exhaust gas treatment device may further include a conductivity measurement section that measures an electrical conductivity of the waste liquid. The electrical conductivity of the spent liquor may vary based on the sulfur concentration of the spent liquor. The calculation portion may calculate the amount of the waste liquid stored in the storage portion based on a waveform representing a temporal change in electrical conductivity of the waste liquid and a waveform representing a temporal change in output of the power unit.

The exhaust gas treatment device may further include a temperature control portion that controls the temperature of the waste liquid. The conductivity measuring section may measure a first electrical conductivity of the waste liquid at a predetermined first time and a second electrical conductivity of the waste liquid at a second time after a predetermined time has elapsed from the first time. The temperature control portion may control the temperature of the waste liquid based on the first electrical conductivity and the second electrical conductivity.

The temperature control unit may reduce the temperature of the waste liquid when the second electrical conductivity is higher than the first electrical conductivity.

The exhaust gas treatment device may further include a temperature control portion that controls the temperature of the waste liquid. The temperature control unit may control the temperature of the waste liquid based on the sulfur concentration of the waste liquid calculated by the calculation unit.

The calculation unit may calculate a first concentration of sulfur at a predetermined first time and a second concentration of sulfur at a second time after a predetermined time elapses from the first time. The temperature control portion may control the temperature of the waste liquid based on the first concentration and the second concentration.

The temperature control unit may decrease the temperature of the waste liquid when the second concentration is higher than the first concentration.

The temperature control portion may control the temperature of the waste liquid so that the temperature of the waste liquid is higher than a predetermined temperature.

The exhaust gas treatment device may further include a waste liquid flow rate measuring unit that measures a flow rate of the waste liquid. The calculation unit may calculate the sulfur concentration of the waste liquid, and may calculate the amount of the waste liquid stored in the storage unit based on the calculated sulfur concentration of the waste liquid and the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit.

The exhaust gas treatment device may further include a temperature measurement unit that measures the temperature of the waste liquid. The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on the temperature of the waste liquid measured by the temperature measurement unit.

The exhaust gas treatment device may further include a concentration measuring unit. The exhaust gas may also contain particulate matter. The storage part is provided with a first water storage part for storing the waste liquid containing the granular substances discharged from the reaction tower, and a second water storage part for storing the waste liquid from which at least a part of the granular substances are removed. The concentration measuring section may measure the sulfur concentration of the waste liquid stored in the second water storage section. The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the waste liquid measured by the concentration measurement unit.

The exhaust gas treatment device may further include an exhaust gas amount calculation unit for calculating an amount of exhaust gas, an exhaust gas component analysis unit for analyzing a component of the exhaust gas, and a water quality calculation unit for calculating a water quality of the waste liquid. The exhaust gas amount calculation unit may calculate the amount of exhaust gas discharged from the power unit based on the output of the power unit measured by the output measurement unit. The exhaust gas component analyzing unit may analyze the components contained in the exhaust gas based on the sulfur concentration of the exhaust gas measured by the first sulfur concentration measuring unit and the sulfur concentration of the fuel measured by the second sulfur concentration measuring unit. The water quality calculation unit may calculate the water quality of the waste liquid based on the amount of the waste gas calculated by the waste gas amount calculation unit, the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit, and the waste gas component precipitated by the waste gas component analysis unit. The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on at least one index of the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit, the temperature of the waste liquid measured by the temperature measurement unit, and the water quality of the waste liquid calculated by the water quality calculation unit.

The exhaust gas treatment device may further include an exhaust gas amount calculation unit that calculates an amount of exhaust gas, an exhaust gas component analysis unit that analyzes components of the exhaust gas, a water quality calculation unit that calculates a water quality of the waste liquid, a waste liquid component analysis unit that analyzes a concentration of an element included in the waste liquid, and a concentration threshold calculation unit that calculates a concentration threshold of the element included in the waste liquid. The exhaust gas amount calculation unit may calculate the amount of exhaust gas discharged from the power unit based on the output of the power unit measured by the output measurement unit. The exhaust gas component analyzing unit may analyze the components contained in the exhaust gas based on the sulfur concentration of the exhaust gas measured by the first sulfur concentration measuring unit and the sulfur concentration of the fuel measured by the second sulfur concentration measuring unit. The water quality calculation unit may calculate the water quality of the waste liquid based on the amount of the waste gas calculated by the waste gas amount calculation unit, the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit, and the waste gas component precipitated by the waste gas component analysis unit. The concentration measuring section may measure the concentration of each element contained in the waste liquid. The waste liquid component analyzing section may analyze the concentrations of the respective elements of the waste liquid measured by the concentration measuring section, respectively. The concentration threshold value calculation unit may calculate the concentration threshold value based on the temperature of the waste liquid measured by the temperature measurement unit and the concentration of each element of the waste liquid precipitated by the waste liquid component analysis unit. The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on at least one of the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit, the water quality of the waste liquid calculated by the water quality calculation unit, and the concentration threshold calculated by the concentration threshold calculation unit.

The calculation unit may calculate the amount of the waste liquid stored in the storage unit based on at least one of the flow rate of the waste liquid, the water quality of the waste liquid, a concentration threshold, the flow rate of the waste gas measured by the gas flow rate measurement unit, the consumption amount of the fuel measured by the consumption amount measurement unit, and the electrical conductivity of the waste liquid measured by the conductivity measurement unit.

The calculation unit may calculate the sulfur concentration of the waste liquid based on at least one of the flow rate of the waste liquid, the water quality of the waste liquid, a concentration threshold, the flow rate of the waste gas measured by the gas flow rate measurement unit, the consumption amount of the fuel measured by the consumption amount measurement unit, and the electrical conductivity of the waste liquid measured by the conductivity measurement unit. The temperature control unit may control the temperature of the waste liquid based on the sulfur concentration of the waste liquid calculated by the calculation unit.

In addition, the summary of the invention does not list all necessary features of the invention. Furthermore, sub-combinations of these feature sets may also constitute the invention.

Drawings

Fig. 1 is a diagram showing an example of an exhaust gas treatment device 100 according to an embodiment of the present invention.

Fig. 2 is a graph showing a relationship between the concentration D of the solute S contained in the waste liquid 46 and the elapsed time t.

Fig. 3 is a diagram showing an example of a block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

FIG. 4 is a graph showing the relationship between the solubility Dm of the solute S and the temperature T (. degree. C.) of the solvent Sv.

Fig. 5 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 6 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 7 is a graph qualitatively showing a relationship between the concentration D of the solute S dissolved in the waste liquid 46 and the electrical conductivity σ of the waste liquid 46.

Fig. 8 is a diagram showing an example of a waveform of a temporal change in the electrical conductivity σ of the waste liquid 46.

Fig. 9 is a diagram showing another example of a waveform of a temporal change in the electrical conductivity σ of the waste liquid 46.

Fig. 10 is a diagram showing an example of a waveform of a temporal change in the output P of the power unit 50.

Fig. 11 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 12 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 13 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 14 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 15 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 16 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Fig. 17 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention.

Detailed Description

The present invention will be described below with reference to embodiments thereof, but the following embodiments are not intended to limit the invention according to the claims. In addition, the combination of the features described in the embodiments is not all necessary for the technical means to solve the technical problems of the present invention.

Fig. 1 is a diagram showing an example of an exhaust gas treatment device 100 according to an embodiment of the present invention. The exhaust gas treatment device 100 includes a reaction tower 10, a storage unit 73, and a calculation unit 74. The arithmetic unit 74 will be described later. The exhaust treatment device 100 may include an exhaust introduction pipe 32 and a power plant 50.

The power plant 50 is, for example, an engine, a boiler, or the like. The power plant 50 exhausts the exhaust gas 30. The exhaust gas introduction pipe 32 connects the power plant 50 and the reaction tower 10. The exhaust gas 30 is introduced into the reaction tower 10. In this example, the exhaust gas 30 discharged from the power plant 50 is introduced into the reaction tower 10 after passing through the exhaust gas introduction pipe 32.

The exhaust gas 30 contains sulfur (S). The exhaust gas 30 may contain Sulfur Oxides (SO) _X ). The exhaust gas 30 may also contain Nitrogen Oxides (NO) _X )。

The reaction tower 10 has an off-gas inlet 11 for introducing the off-gas 30 and an off-gas outlet 17 for discharging the off-gas 30. The liquid 40 for treating the exhaust gas 30 is introduced into the reaction tower 10. The liquid 40 introduced into the reaction tower 10 treats the exhaust gas 30 inside the reaction tower 10. The liquid 40 is, for example, an alkaline liquid. The liquid 40 may also be seawater. Treating the exhaust gas 30 means removing harmful substances contained in the exhaust gas 30. The liquid 40 becomes a waste liquid 46 after the exhaust gas 30 is treated. As described above, the exhaust gas 30 contains sulfur (S). Therefore, the waste liquid 46 after the treatment of the exhaust gas 30 contains sulfur (S). The reaction tower 10 discharges this waste liquid 46 containing sulfur (S).

The reaction tower 10 of the present example has a side wall 15, a bottom surface 16, a gas processing portion 18, and a liquid discharge port 19. The reaction tower 10 of this example is cylindrical. In this example, the exhaust gas outlet 17 is disposed at a position facing the bottom surface 16 in a direction parallel to the central axis of the columnar reactor 10. In this example, the side wall 15 and the bottom surface 16 are the inner side surface and the bottom surface of the cylindrical reaction tower 10, respectively. The off-gas introduction port 11 may be provided on the side wall 15. In this example, the exhaust gas 30 passes through the exhaust gas inlet 11 from the exhaust gas inlet pipe 32, and is then introduced into the gas treatment section 18.

The side walls 15 and the bottom surface 16 are formed of a material that is durable to the exhaust gas 30, the liquid 40, and the waste liquid 46. The material may be a combination of an iron material such as SS400 or S-TEN (registered trademark) and at least one of a plating coat and a coating coat, a copper alloy such as naval copper, an aluminum alloy such as aluminum brass, a nickel alloy such as cupronickel, hastelloy (registered trademark), SUS316L, SUS329J4L, or SUS 312.

In this specification, technical matters will be described using orthogonal coordinate axes of X, Y, and Z axes. In the present specification, a plane parallel to the bottom surface 16 of the reaction tower 10 is an XY plane, and a direction from the bottom surface 16 toward the exhaust gas outlet 17 (a direction perpendicular to the bottom surface 16) is a Z axis. In this specification, a predetermined direction in the XY plane is referred to as an X-axis direction, and a direction orthogonal to the X axis in the XY plane is referred to as a Y-axis direction.

The Z-axis direction may be parallel to the vertical direction. When the Z-axis direction is parallel to the vertical direction, the XY plane may be a horizontal plane. The Z-axis direction may be parallel to the horizontal direction. When the Z-axis direction is parallel to the horizontal direction, the XY plane may be parallel to the vertical direction.

The exhaust gas treatment device 100 is, for example, a rotary scrubber for a ship. In the rotary scrubber, the flue gas 30 introduced into the reactor 10 moves forward in the direction (in this example, the Z-axis direction) from the flue gas inlet 11 to the flue gas outlet 17 while rotating inside the reactor 10. In this example, the exhaust gas 30 rotates in the XY plane when viewed from the exhaust gas discharge port 17 toward the bottom surface 16.

The direction of movement of the flue gas 30 inside the reaction tower 10 from the flue gas inlet 11 to the flue gas outlet 17 is defined as the direction of movement E1. The fact that the flue gas 30 advances in the advancing direction E1 means that the flue gas 30 advances in the direction from the flue gas introduction port 11 to the flue gas discharge port 17. In this example, the direction of advance E1 of the exhaust gas 30 is parallel to the Z-axis. In fig. 1, the advancing direction E1 of the exhaust gas 30 is indicated by a solid arrow.

The reaction column 10 may have one or more main pipes 12 and one or more branch pipes 13 for providing the liquid 40. The reaction tower 10 may have one or more injection parts 14 for injecting the liquid 40. In this example, the injection part 14 is connected with the branch pipe 13, and the branch pipe 13 is connected with the main pipe 12.

The reaction tower 10 of this example has 3 main pipes 12 (main pipe 12-1, main pipe 12-2, and main pipe 12-3). In the illustrated example, the main duct 12-1 and the main duct 12-3 are the main ducts 12 disposed closest to the exhaust gas introduction port 11 side and closest to the exhaust gas discharge port 17 side, respectively, in the direction parallel to the Z axis. In the present example, the main pipe 12-2 is the main pipe 12 disposed between the main pipe 12-1 and the main pipe 12-3 in the Z-axis direction.

The reaction column 10 of this example is provided with branch pipes 13-1 to 13-12. In the present example, the branch pipe 13-1 and the branch pipe 13-12 are the branch pipes 13 disposed on the side closest to the exhaust gas introduction port 11 and the side closest to the exhaust gas discharge port 17 in the direction parallel to the Z axis, respectively. In this example, branch 13-1, branch 13-3, branch 13-5, branch 13-7, branch 13-9, and branch 13-11 extend in the Y-axis direction, and branch 13-2, branch 13-4, branch 13-6, branch 13-8, branch 13-10, and branch 13-12 extend in the X-axis direction.

In this example, branch 13-1 through branch 13-4 are connected to main pipe 12-1, branch 13-5 through branch 13-8 are connected to main pipe 12-2, and branch 13-9 through branch 13-12 are connected to main pipe 12-3. Branch pipe 13-1, branch pipe 13-3, branch pipe 13-5, branch pipe 13-7, branch pipe 13-9, and branch pipe 13-11 may be disposed on both sides of main pipe 12 in a direction parallel to the Y-axis. Branch pipe 13-2, branch pipe 13-4, branch pipe 13-6, branch pipe 13-8, branch pipe 13-10, and branch pipe 13-12 may be disposed on both sides of main pipe 12 in a direction parallel to the X-axis.

Taking branch pipe 13-1 as an example, branch pipe 13-1A and branch pipe 13-1B are branch pipes 13-1 arranged on one side and the other side of main pipe 12-1, respectively, in a direction parallel to the Y axis. In a direction parallel to the Y-axis, branch 13-1A and branch 13-1B may be disposed to sandwich trunk 12-1. In FIG. 1, the branch pipe 13-1A and the branch pipe 13-3A are not shown because they are disposed at positions overlapping the main pipe 12-1.

Taking branch pipe 13-2 as an example, branch pipe 13-2A and branch pipe 13-2B are branch pipes 13-2 arranged on one side and the other side of main pipe 12-1, respectively, in a direction parallel to the X-axis. In a direction parallel to the X-axis, branch pipe 13-2A and branch pipe 13-2B may be disposed so as to sandwich main pipe 12-1.

The reaction tower 10 of the present example includes the ejection units 14-1 to 14-12. In the present example, the injection part 14-1 and the injection part 14-12 are injection parts 14 provided on the side closest to the exhaust gas introduction port 11 and the side closest to the exhaust gas discharge port 17 in the direction parallel to the Z axis, respectively. The ejection parts 14-1 to 14-12 of the present example are connected to the branch pipes 13-1 to 13-12, respectively. In one branch pipe 13 extending in the Y-axis direction, a plurality of ejection portions 14 may be provided on one side of the main pipe 12 in the direction parallel to the Y-axis, and a plurality of ejection portions 14 may be provided on the other side. In one branch pipe 13 extending in the X-axis direction, a plurality of injection parts 14 may be provided on one side of the main pipe 12 in the direction parallel to the X-axis, and a plurality of injection parts 14 may be provided on the other side. In fig. 1, the ejection portion 14-1A, the ejection portion 14-3A, the ejection portion 14-5A, the ejection portion 14-7A, the ejection portion 14-9A, and the ejection portion 14-11A are not shown because they are disposed at positions overlapping the main pipe 12.

The ejection portion 14 has an opening surface for ejecting the liquid 40. In FIG. 1, the opening surface is indicated by an "X" mark. In the one branch pipe 13, the opening surfaces of the injection parts 14 arranged on one side and the other side of the main pipe 12 may be one direction and the other direction forming a predetermined angle with the extending direction of the branch pipe 13. In the present example, the opening surface of the injection part 14-2A provided on one side of the main pipe 12-1 is a direction forming a predetermined angle with the branch pipe 13-2A, and the opening surface of the injection part 14-2B provided on the other side of the main pipe 12-1 is a direction forming a predetermined angle with the branch pipe 13-2B.

The exhaust gas treatment device 100 may further include a circulation pipe 20 and a circulation pump 60. In this example, the waste liquid 46 is discharged to the circulation pipe 20 after passing through the liquid discharge port 19. The circulation pump 60 may be provided to the circulation pipe 20.

The exhaust gas treatment device 100 may be provided with a purifying agent input portion 77. As described above, the exhaust gas 30 contains sulfur (S). The exhaust gas 30 contains, for example, Sulfur Oxides (SO) _X ) And the like. Sulfur Oxides (SO) _x ) For example, sulfurous acid gas (SO) ₂ ). The depurative input 77 inputs a depurative 78 for removing at least a part of the harmful substance from the exhaust gas 30 into at least one of the waste liquid 46 and the liquid 40.

The scavenger 78 may be at least one of a magnesium compound, a sodium compound, and a calcium compound. Scavenger 78 may be magnesium hydroxide (Mg (OH) ₂ ) Magnesium oxide (MgO), sodium hydroxide (NaOH), sodium carbonate (Na) ₂ CO ₃ ) And calcium carbonate (CaCO) ₃ ) At least one of (1).

The scavenger input 77 may input a scavenger 78 into the waste stream 46. The depurative input part 77 may input the depurative 78 to the waste flowing through the circulation pipe 20In the liquid 46. In the case where the scavenger 78 is sodium hydroxide (NaOH), the scavenger 78 is introduced into the waste liquid 46 to become a sodium hydroxide (NaOH) solution. The waste liquid 46 is introduced into the reaction tower 10 by the circulation pump 60. The liquid 46 introduced into the reaction tower 10 passes through the main pipe 12, and is then injected from the injection unit 14 into the reaction tower 10 (gas processing unit 18). The waste liquid 46 and sulfurous acid gas (SO) ₂ ) The reaction in the gas processing section 18 utilizes the following [ chemical formula 1]]And [ chemical formula 2]To indicate.

[ chemical formula 1]

SO ₂ +H ₂ O→HSO3 ^- +H ⁺

[ chemical formula 2]

HSO ₃ ^- +H ⁺ +2NaOH→Na ₂ SO ₄ +H ₂ O

Such as [ chemical formula 1]]Shown as sulfurous acid gas (SO) ₂ ) By chemical reaction into bisulfite ions (HSO) ₃ ^- ). The waste stream 46 is made to contain bisulfite ions (HSO) by this chemical reaction ₃ ^- ) An aqueous solution of (a). The waste liquid 46 is introduced into the reaction tower 10 again by the circulation pump 60, and then is again injected into the reaction tower 10 from the injection unit 14. Bisulfite ion (HSO 3) ^- ) At least a portion of the bisulfite ions (HSO 3) contained in the aqueous solution ^- ) Is changed into sodium sulfate (Na) by a chemical reaction shown in chemical formula 2 ₂ SO ₄ ) And water (H) ₂ O). Sodium sulfate (Na) ₂ SO ₄ ) The aqueous solution contains sulfate ions (SO) ₄ ^2- )。

In the present specification, bisulfite ion (HSO) ₃ ^- ) And sulfate ion (SO) ₄ ^2- ) Is referred to as a sulfur oxide ion. Waste liquid 46 was used to repeat the above [ chemical formula 1]]And [ chemical formula 2]The chemical reaction shown. Therefore, the concentration of the sulfur oxide ions contained in the waste liquid 46 is likely to increase with the number of times the waste liquid 46 is circulated. When the concentration of the sulfur oxide ions contained in the waste liquid 46 increases, the waste liquid 46 becomes difficult to remove the harmful substances contained in the exhaust gas 30.

The exhaust gas treatment device 100 may include a supplement unit 76. The replenishment section 76 can replenish the waste liquid 46 with the liquid 40. The replenishing portion 76 may replenish the liquid 40 into the waste liquid 46 flowing through the circulation pipe 20. In this example, the storage portion 73 is connected to the circulation pipe 20. The storage section 73 stores at least a part of the waste liquid 46 discharged from the reaction tower 10. The storage section 73 stores a part of the circulating waste liquid 46. This part of the waste liquid 46 may for example be so-called extract water. Replenishment section 76 may replenish waste liquid 46 with the same amount of liquid 40 as the portion of waste liquid 46. Therefore, it becomes easy to suppress an increase in the concentration of the sulfur oxide ions contained in the waste liquid 46. The circulation pump 60 may introduce the liquid 40 and the waste liquid 46 into the reaction tower 10.

The exhaust gas treatment device 100 may include a flow rate control unit 70. The flow rate control unit 70 controls the flow rates of the liquid 40 and the waste liquid 46 supplied to the reaction tower 10. The flow control portion 70 may have a valve 72. In this example, the flow rate control section 70 controls the flow rates of the liquid 40 and the waste liquid 46 supplied to the ejection section 14 through the valve 72. The flow rate control unit 70 of this example includes 3 valves 72 (valve 72-1, valve 72-2, and valve 72-3). The flow rate control unit 70 in this example controls the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-1, the main pipe 12-2, and the main pipe 12-3 by the valves 72-1, 72-2, and 72-3, respectively. The liquid 40 and the waste liquid 46 supplied to the main pipe 12 pass through the branch pipe 13, and are then injected from the injection part 14 into the reaction tower 10 (gas processing part 18).

The flow rate control section 70 may control the flow rates of the liquid 40 and the waste liquid 46 so that the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-1 are larger than the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-2. The flow rate control section 70 may control the flow rates of the liquid 40 and the waste liquid 46 so that the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-2 are larger than the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-3. The ratio of the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-3, the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-2, and the flow rates of the liquid 40 and the waste liquid 46 supplied to the main pipe 12-1 is, for example, 1:2: 9.

The storage part 73 may have a first water storage part 71, a second water storage part 75, and a lead-out pump 61. The first water storage portion 71 of the present example stores a part of the waste liquid 46 flowing through the circulation pipe 20. In this example, the second water storage unit 75 stores at least a part of the waste liquid 46 stored in the first water storage unit 71. The discharge pump 61 discharges the at least a part of the waste liquid 46 stored in the first water storage section 71. The lead-out pump 61 leads the lead-out waste liquid 46 to the second water storage unit 75.

Exhaust gas treatment device 100 may further include a lead-out amount control unit 84. The lead-out amount control unit 84 controls at least one of the amount of the waste liquid 46 led out from the first water storage unit 71 and the amount of the waste liquid 46 led into the second water storage unit 75. In this example, the lead-out amount control unit 84 controls at least one of the amount of the waste liquid 46 led out from the first water storage unit 71 and the amount of the waste liquid 46 introduced into the second water storage unit 75 by controlling the lead-out pump 61.

Fig. 2 is a graph showing a relationship between the concentration D of the solute S contained in the waste liquid 46 and the elapsed time t. The concentration D of solute S refers to the solvent Sv (in this example, water (H) dissolved in a unit volume or unit mass ₂ O)) the mass of solute S in the solution. Solute S is, for example, sodium sulfate (Na) ₂ SO ₄ ). In fig. 2, the temperature of the solvent Sv is fixed at a predetermined temperature T (e.g., room temperature) regardless of the elapsed time T. In this example, at the elapsed time 0 (time 0) in fig. 2, the removal of the harmful substances contained in the exhaust gas 30 by the liquid 40 is started.

The solubility Dm is the maximum value of the mass of solute S that can be dissolved in the solvent Sv at the temperature T. When the concentration D of the solute S is greater than the solubility Dm, the solute S having the difference between the concentration D and the solubility Dm of the solute S is precipitated. Referring to fig. 1, the precipitated solute S is easily retained in at least one of the inside of the reaction tower 10, the circulation pipe 20, and the storage part 73. When the solute S is retained, circulation of the waste liquid 46 and the liquid 40 is easily hindered. Therefore, the concentration D of the solute S contained in the waste liquid 46 is preferably maintained to be less than the solubility Dm.

As illustrated in fig. 1, the storage section 73 stores at least a part of the waste liquid 46 discharged from the reaction tower 10. At least a part of the waste liquid 46 is drawn out to the storage section 73. In fig. 2, the dashed line portion is a relationship between the concentration D of dissolved S and the elapsed time t when the waste liquid 46 is not drawn out from the storage portion 73. When the waste liquid 46 is not extracted, the concentration of the sulfur oxide ions contained in the waste liquid 46 is likely to increase with time. The time when the concentration of the sulfur oxide ions reaches the solubility Dm is defined as time tm.

The amount of the waste liquid 46 extracted from the reservoir 73 per unit time is referred to as an extraction amount M. In the case where the solute S is dissolved in the waste liquid 46, when the draw-out amount M per unit time of the waste liquid 46 is M1 and M2 (> M1), the relationship between the concentration D of the solute S and the elapsed time t is shown by a chain line and a two-dot chain line, respectively, in fig. 2. The concentration D of the solute S easily increases with the time elapsed from time zero. When the extraction amounts M are M1 and M2, the concentration D of the solute S tends to converge to a constant concentration at a time ts after the time tm. Concentrations after convergence when the extraction amounts were M1 and M2 were set as concentrations D1 and D2. Both the concentration D1 and the concentration D2 were less than the solubility Dm. The time ts when the extraction amount is M1 and the time ts when the extraction amount is M2 may be the same or different.

Since the extraction amount M2 is larger than the extraction amount M1, the difference between the concentration D2 and the solubility Dm is easily larger than the difference between the concentration D1 and the solubility Dm. That is, the concentration D2 is easily smaller than the concentration D1. Therefore, the risk of precipitation of solute S at the concentration D2 is easily smaller than that at the concentration D1. That is, the concentration D of the solute S is preferably small from the viewpoint of the precipitation risk.

However, since the withdrawal amount M2 is larger than the withdrawal amount M1, the capacity of the storage portion 73 in the case of the withdrawal amount M2 is likely to be larger than the capacity of the storage portion 73 in the case of the withdrawal amount M1. When the exhaust gas treatment device 100 is mounted on a ship, for example, the size of the storage unit 73 is preferably as small as possible. As described above, for example, when the exhaust gas treatment device 100 is mounted on a ship, the extraction amount M of the waste liquid 46 is preferably kept as small as possible by keeping the concentration D of the solute S as large as possible to be less than the solubility Dm.

Fig. 3 is a diagram showing an example of a block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. In fig. 3, the circulation pipe 20 in fig. 1 is shown by a thick solid line. In fig. 3, the flow rate control portion 70 and the valve 72 shown in fig. 1 are not shown.

Exhaust gas treatment device 100 may have arithmetic unit 74. The calculation unit 74 calculates the amount of the waste liquid 46 stored in the storage unit 73 based on the sulfur (S) concentration of the waste liquid 46. The sulfur (S) concentration of the waste stream 46 may be the sulfur (S) concentration of the sulfur oxide ions dissolved in the waste stream 46. The amount of the waste liquid 46 stored in the storage section 73 may be the amount of the waste liquid 46 moving from the circulation pipe 20 to the storage section 73 per unit time (i.e., the above-described drawn-out amount M). The storage unit 73 stores the amount of the waste liquid 46 calculated by the calculation unit 74, thereby easily suppressing the precipitation of the solute S in the inside of the reaction tower 10, the circulation pipe 20, and the storage unit 73. The arithmetic unit 74 is, for example, a PLC (Programmable Logic Controller). .

The calculation portion 74 may calculate the amount of the waste liquid 46 stored in the storage portion 73 so that the sulfur (S) concentration of the waste liquid 46 is less than the solubility Dm. In the example of fig. 2, the calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 per unit time as the extraction amount M1 so that the sulfur (S) concentration of the waste liquid 46 becomes the concentration D1. The calculation unit 74 may calculate the extraction amount M of the waste liquid 46 stored in the storage unit 73 per unit time so that the sulfur (S) concentration of the waste liquid 46 is less than the solubility Dm, that is, equal to or less than the predetermined concentration threshold Dth.

The calculation unit 74 may store in advance the relationship between the sulfur (S) concentration of the waste liquid 46 flowing through the circulation pipe 20 and the minimum value Mmin of the extraction amount M of the waste liquid 46. The calculation unit 74 can calculate the minimum value Mmin of the extraction amount M corresponding to the sulfur (S) concentration of the waste liquid 46 flowing through the circulation pipe 20, based on the relationship between the sulfur (S) concentration of the waste liquid 46 flowing through the circulation pipe 20 and the stored minimum value Mmin of the sulfur (S) concentration of the waste liquid 46 and the extraction amount M.

The exhaust gas treatment device 100 may further include a first sulfur concentration measurement unit 80. The first sulfur concentration measuring unit 80 can measure the sulfur (S) concentration of the exhaust gas 30 treated with the liquid 40. The off-gas 30 treated with the liquid 40 may refer to the off-gas 30 discharged from the reaction tower 10. The first sulfur concentration measuring unit 80 can measure the sulfur (S) concentration of the exhaust gas 30 introduced into the reaction tower 10. The off-gas 30 introduced into the reaction tower 10 may refer to the off-gas 30 passing through an off-gas introduction pipe 32 (refer to fig. 1).

The exhaust gas treatment device 100 may further include a plurality of first sulfur concentration measurement units 80. In this example, the exhaust gas treatment device 100 includes 3 first sulfur concentration measurement units 80 (a first sulfur concentration measurement unit 80-1, a first sulfur concentration measurement unit 80-2, and a first sulfur concentration measurement unit 80-3). In this example, the first sulfur concentration measuring unit 80-1 and the first sulfur concentration measuring unit 80-2 measure the sulfur (S) concentration of the exhaust gas 30 treated with the liquid 40, and the first sulfur concentration measuring unit 80-3 measures the sulfur (S) concentration of the exhaust gas 30 introduced into the reaction tower 10.

In this example, the first sulfur concentration measuring unit 80-1 is provided in the exhaust gas outlet 17, the first sulfur concentration measuring unit 80-2 is provided in the reaction tower 10, and the first sulfur concentration measuring unit 80-3 is provided in the exhaust gas introduction pipe 32 (see fig. 1). The exhaust gas treatment device 100 may have all of the first sulfur concentration measurement unit 80-1 to the first sulfur concentration measurement unit 80-3, or any one of them.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the sulfur (S) concentration measured by the first sulfur concentration measurement unit 80. In this example, the calculation unit 74 calculates the sulfur (S) concentration of the waste liquid 46 based on the sulfur (S) concentration measured by the first sulfur concentration measurement unit 80, and calculates the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on at least one of the first sulfur concentration measurement unit 80-1 and the first sulfur concentration measurement unit 80-2 or the first sulfur concentration measurement unit 80-3. The calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 based on the sulfur (S) concentration measured by at least one of the first sulfur concentration measurement unit 80-1 and the first sulfur concentration measurement unit 80-2 or the sulfur (S) concentration measured by the first sulfur concentration measurement unit 80-3. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on at least one of the first sulfur concentration measurement unit 80-1 and the first sulfur concentration measurement unit 80-2 and the first sulfur concentration measurement unit 80-3. The calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 based on the sulfur (S) concentration measured by at least one of the first sulfur concentration measurement unit 80-1 and the first sulfur concentration measurement unit 80-2 and the sulfur (S) concentration measured by the first sulfur concentration measurement unit 80-3. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration.

The waste liquid 46 stored in the first water storage section 71 can be discharged to the second water storage section 75 in the drawn-out amount M. The pumped-out amount M of the waste liquid 46 can be led out from the first water storage section 71 to the second water storage section 75 by the pump 61. In this example, the amount of the waste liquid 46 calculated by the calculation unit 74 is input to the discharge pump 61. In the present example, the lead-out pump 61 controls the amount of the waste liquid 46 led out from the first water storage section 71 to the second water storage section 75 per unit time based on the amount of the waste liquid 46 calculated by the calculation section 74.

The replenishment unit 76 may replenish the liquid 40 in an amount equal to the amount of the waste liquid 46 calculated by the calculation unit 74. In this example, the replenishing part 76 replenishes the amount of the liquid 40 into the first water storage part 71.

The arithmetic unit 74 may store the relationship between the sulfur (S) concentration of the waste liquid 46 and the sulfur (S) concentration of the exhaust gas 30 in advance. The calculation unit 74 can calculate the sulfur (S) concentration of the waste liquid 46 corresponding to the measured sulfur (S) concentration of the exhaust gas 30 from the relationship between the sulfur (S) concentration of the exhaust gas 30 measured by the first sulfur concentration measurement unit 80 and the stored sulfur (S) concentration of the waste liquid 46 and the sulfur (S) concentration of the exhaust gas 30. The calculation unit 74 may calculate the minimum value Mmin of the extraction amount M corresponding to the sulfur (S) concentration of the waste liquid 46 from the relationship between the stored sulfur (S) concentration of the waste liquid 46 and the minimum value Mmin of the extraction amount M. The discharge pump 61 can control the amount of the waste liquid 46 discharged from the first water storage portion 71 to the second water storage portion 75 per unit time to be equal to or more than the minimum value Mmin.

The sulfur (S) concentration of the waste liquid 46 can be measured by at least one of ion chromatography and Pack test (registered trademark). In the case where the sulfur (S) concentration of the waste liquid 46 is measured by the Pack test (registered trademark), the sulfur (S) concentration of the waste liquid 46 can be measured based on the color of the waste liquid 46 discolored by the Pack test (registered trademark). The measured sulfur (S) concentration of the waste liquid 46 may be input to the arithmetic unit 74.

The exhaust gas treatment device 100 may further include a gas flow rate measuring unit 82. The gas flow rate measuring unit 82 measures the flow rate of the exhaust gas 30. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the flow rate of the exhaust gas 30 measured by the gas flow rate measurement unit 82. This flow rate of the exhaust gas 30 may be a flow rate of the exhaust gas 30 per unit time. In the present example, the calculation unit 74 calculates the sulfur (S) concentration of the waste liquid 46 based on the flow rate of the exhaust gas 30 measured by the gas flow rate measurement unit 82, and calculates the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration of the waste liquid 46.

The gas flow rate measuring unit 82 can measure the flow rate of the exhaust gas 30 discharged from the reaction tower 10. The gas flow rate measuring unit 82 may measure the flow rate of the off-gas 30 flowing through the reaction tower 10. The gas flow rate measuring unit 82 may measure the flow rate of the off-gas 30 introduced into the reaction tower 10. The flow rate of the off-gas 30 introduced into the reaction tower 10 may refer to the flow rate of the off-gas 30 passing through the off-gas introduction pipe 32 (see fig. 1).

The exhaust gas treatment device 100 may include a plurality of gas flow rate measurement units 82. In this example, the exhaust gas treatment device 100 has 3 gas flow rate measurement units 82 (a gas flow rate measurement unit 82-1, a gas flow rate measurement unit 82-2, and a gas flow rate measurement unit 82-3). In this example, the gas flow rate measuring unit 82-1 measures the flow rate of the off-gas 30 discharged from the reaction tower 10, the gas flow rate measuring unit 82-2 measures the flow rate of the off-gas 30 flowing inside the reaction tower, and the gas flow rate measuring unit 82-3 measures the flow rate of the off-gas 30 introduced into the reaction tower 10.

In this example, the gas flow rate measuring unit 82-1 is provided in the exhaust gas outlet 17, the gas flow rate measuring unit 82-2 is provided in the reaction tower 10, and the gas flow rate measuring unit 82-3 is provided in the exhaust gas inlet pipe 32 (see fig. 1). The exhaust gas treatment device 100 may have all of the gas flow rate measurement unit 82-1 to the gas flow rate measurement unit 82-3, or any one of them.

The calculation unit 74 can calculate the amount of the waste liquid 46 stored in the storage unit 73 based on at least one of the gas flow rate measurement unit 82-1, the gas flow rate measurement unit 82-2, and the gas flow rate measurement unit 82-3. The calculation unit 74 can calculate the sulfur (S) concentration of the waste liquid 46 based on at least one of the gas flow measurement unit 82-1, the gas flow measurement unit 82-2, and the gas flow measurement unit 82-3. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration. The discharge pump 61 controls the amount (the discharge amount M) of the waste liquid 46 discharged from the first water storage unit 71 to the second water storage unit 75 per unit time based on the amount of the waste liquid 46 calculated by the calculation unit 74.

The arithmetic unit 74 may store the relationship between the sulfur (S) concentration of the waste liquid 46 and the flow rate of the exhaust gas 30 in advance. The calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 corresponding to the measured flow rate of the waste gas 30, based on the relationship between the flow rate of the waste gas 30 measured by the gas flow rate measurement unit 82 and the stored sulfur (S) concentration of the waste liquid 46 and the flow rate of the waste gas 30. The calculation unit 74 may calculate the minimum value Mmin of the extraction amount M corresponding to the sulfur (S) concentration of the waste liquid 46 from the relationship between the stored sulfur (S) concentration of the waste liquid 46 and the minimum value Mmin of the extraction amount M. The discharge pump 61 can control the amount of the waste liquid 46 discharged from the first water storage portion 71 to the second water storage portion 75 per unit time to be equal to or more than the minimum value Mmin.

The calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 by multiplying the flow rate of the exhaust gas 30 measured by the gas flow rate measurement unit 82 and the sulfur (S) concentration of the exhaust gas 30 measured by the first sulfur concentration measurement unit 80. The product of the flow rate of the exhaust gas 30 and the sulfur (S) concentration of the exhaust gas 30 is equal to the mass of sulfur (S) contained in the flow rate of the exhaust gas 30. The calculation unit 74 calculates the mass contained in the exhaust gas 30, and can calculate the sulfur (S) concentration of the waste liquid 46 based on the calculated mass.

The exhaust gas treatment device 100 may further include a fuel supply unit 97 and a consumption amount measurement unit 98. The consumption measuring unit 98 measures the fuel consumption of the power plant 50. The fuel supply unit 97 supplies the fuel 96 for driving the power unit 50 to the power unit 50.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the consumption amount of the fuel 96 measured by the consumption amount measurement unit 98. The consumption of the fuel 96 may be the mass of fuel 96 consumed by the power plant 50 per unit time. The consumption amount measuring unit 98 may measure the consumption amount of the fuel 96 based on the amount of decrease in the mass of the fuel 96 stored in the fuel supply unit 97.

In the case where the fuel 96 is C heavy oil, sulfur (S) is contained in the fuel 96. Therefore, as the fuel 96 of the power plant 50 is consumed, sulfur (S) is likely to be contained in the exhaust gas 30. When the exhaust gas 30 containing sulfur (S) is treated with the liquid 40 (see fig. 1), the waste liquid 46 easily contains sulfur (S). In the present example, the calculation unit 74 calculates the sulfur (S) concentration of the waste liquid 46 based on the consumption amount of the exhaust gas 96 measured by the consumption amount measurement unit 98, and calculates the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration of the waste liquid 46.

The arithmetic unit 74 may store in advance the relationship between the sulfur (S) concentration of the waste liquid 46 and the consumption amount of the fuel 96. The calculation unit 74 can calculate the sulfur (S) concentration of the waste liquid 46 corresponding to the measured consumption amount of the fuel 96, from the relationship between the consumption amount of the fuel 96 measured by the consumption amount measurement unit 98 and the sulfur (S) concentration of the stored waste liquid 46 and the consumption amount of the fuel 96. The calculation unit 74 may calculate the minimum value Mmin of the extraction amount M corresponding to the sulfur (S) concentration of the waste liquid, based on the relationship between the stored sulfur (S) concentration of the waste liquid 46 and the minimum value Mmin of the extraction amount M. The discharge pump 61 can control the amount of the waste liquid 46 discharged from the first water storage portion 71 to the second water storage portion 75 per unit time to be equal to or more than the minimum value Mmin.

The exhaust gas treatment device 100 may further include a second sulfur concentration measuring unit 99. The second sulfur concentration measuring station 99 measures the sulfur (S) concentration of the fuel 96. The second sulfur concentration measuring portion 99 may be provided between the fuel supply portion 97 and the power unit 50.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the consumption amount of the fuel 96 measured by the consumption amount measurement unit 98 and the sulfur (S) concentration of the fuel 96 measured by the second sulfur concentration measurement unit 99. In this example, the calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 based on the consumption amount of the fuel 96 measured by the consumption amount measurement unit 98 and the sulfur (S) concentration of the fuel 96 measured by the second sulfur concentration measurement unit 99. In this example, the calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration of the waste liquid 46.

The calculation unit 74 may calculate the mass of sulfur (S) contained in the consumption amount of the fuel 96 based on the predetermined sulfur (S) concentration of the fuel 96 and the consumption amount of the fuel 96 measured by the consumption amount measurement unit 98. The predetermined sulfur (S) concentration of the fuel 96 refers to the mass of sulfur (S) per unit volume or unit mass specified in, for example, a composition table of C heavy oil when the fuel 96 is C heavy oil. The computing unit 74 computes the mass of the fuel 96, and can compute the sulfur (S) concentration of the waste liquid 46 based on the computed mass.

The calculation unit 74 may store in advance the relationship between the sulfur (S) concentration of the waste liquid 46, the consumption amount of the fuel 96, and the sulfur (S) concentration of the fuel 96. The calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 corresponding to the measured consumption amount of the fuel 96, based on the relationship between the consumption amount of the fuel 96 measured by the consumption amount measurement unit 98 and the sulfur (S) concentration of the stored waste liquid 46, the consumption amount of the fuel 96, and the sulfur (S) concentration of the fuel 96.

The exhaust gas treatment device 100 may further include an output measurement unit 52. The output measuring unit 52 measures the output P of the power unit 50. In the case where the power plant 50 is an engine, the output P of the power plant 50 may be the rotational speed of the engine per unit time.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the output P of the power unit 50 measured by the output measurement unit 52. Since the power plant 50 is driven by consuming the fuel 96, the greater the output P of the power plant 50, the greater the consumption of the fuel 96 tends to be. When the fuel 96 is C heavy oil, since sulfur (S) is contained in the fuel 96, the exhaust gas 30 easily contains sulfur (S) as the power plant 50 consumes the fuel 96 as described above. When the waste gas 30 containing sulfur (S) is treated with the liquid 40 (see fig. 1), the waste liquid 46 easily contains sulfur (S). In the present example, the calculation unit 74 calculates the sulfur (S) concentration of the waste liquid 46 based on the output P of the power unit 50 measured by the output measurement unit 52, and calculates the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration of the waste liquid 46.

The calculation unit 74 may store in advance the relationship between the sulfur (S) concentration of the waste liquid 46 and the output P of the power plant 50. The calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 corresponding to the measured output P of the power unit 50, based on the relationship between the output P of the power unit 50 measured by the output measurement unit 52 and the stored sulfur (S) concentration of the waste liquid 46 and the output P of the power unit 50. The calculation unit 74 may calculate the minimum value Mmin of the extraction amount M corresponding to the sulfur (S) concentration of the waste liquid 46 based on the relationship between the stored sulfur (S) concentration of the waste liquid 46 and the minimum value Mmin of the extraction amount M. The discharge pump 61 can control the amount of the waste liquid 46 discharged from the first water storage portion 71 to the second water storage portion 75 per unit time to be equal to or more than the minimum value Mmin.

The exhaust gas treatment device 100 may further include a waste liquid flow rate measuring unit 93. The waste liquid flow rate measuring section 93 measures the flow rate of the waste liquid 46. The waste liquid flow rate measuring section 93 can measure the flow rate of the waste liquid 46 flowing through the circulation pipe 20.

The calculation unit 74 can calculate the sulfur (S) concentration of the waste liquid 46. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration of the waste liquid 46 and the flow rate of the waste liquid 46 measured by the waste liquid flow rate measurement unit 93. The sulfur (S) concentration of the waste liquid 46 may vary depending on the inside of the reaction tower 10, the circulation pipe 20, and the storage section 73. The sulfur (S) concentration of the waste liquid 46 may vary locally in the reaction tower 10, the circulation pipe 20, and the storage section 73. Therefore, the sulfur (S) concentration of the waste liquid 46 in at least one of the inside of the reaction tower 10, the circulation pipe 20, and the storage unit 73 may be higher than the sulfur (S) concentration of the waste liquid 46 calculated by the calculation unit 74.

Since the liquid 40 and the waste liquid 46 remove harmful substances contained in the exhaust gas 30 inside the reaction tower 10, the flow rate f of the liquid 40 and the waste liquid 46 needs to be a predetermined flow rate fa or more. It is necessary to provide the liquid 40 and the waste liquid 46 in sufficient amounts required for removing the harmful substances contained in the off-gas 30 inside the reaction tower 10.

When the sulfur (S) concentration of the waste liquid 46 in at least one of the inside of the reaction tower 10, the circulation pipe 20, and the storage unit 73 is higher than the sulfur (S) concentration of the waste liquid 46 calculated by the calculation unit 74, the concentration of the solute S in at least one of the inside of the reaction tower 10, the circulation pipe 20, and the storage unit 73 may be higher than the solubility Dm. In the case where the concentration of the solute S is greater than the solubility Dm, the solute S precipitates. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 in a range where the flow rate f is equal to or higher than the flow rate fa when the sulfur (S) concentration of the exhaust gas 46 is higher than the predetermined concentration Da (< solubility Dm). The discharge pump 61 may control the amount of the waste liquid 46 discharged from the first water storage unit 71 to the second water storage unit 75 per unit time to the amount of the waste liquid 46 calculated by the calculation unit 74.

FIG. 4 is a graph showing the relationship between the solubility Dm of the solute S and the temperature T (. degree. C.) of the solvent Sv. In FIG. 4, solvent Sv is water (H) ₂ 0). In FIG. 4, solutes S are shown as sodium hydroxide (NaOH), sodium carbonate (NaCO), respectively ₃ ) Sodium sulfate (Na) ₂ SO ₄ ) And calcium carbonate (CaCO) ₃ ) Solubility Dm in the case of (1). In fig. 4, the solubility Dm of each solute S is normalized by the maximum value of the solubility Dm of each solute S.

Sodium carbonate (NaCO) ₃ ) Solubility Dm and sodium sulfate (Na) ₂ SO ₄ ) Shows a maximum at the temperature Tp of the solvent Sv. In the present example, the temperature Tp is 40 ℃. As the temperature T of the solvent Sv increases, the solubility Dm of sodium hydroxide (NaOH) increases. As the temperature T of the solvent Sv increases, calcium carbonate (CaCO) ₃ ) The solubility Dm of (a) decreases.

Fig. 5 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example differs from the exhaust gas treatment device 100 shown in fig. 3 in that it further includes a temperature measurement unit 95 and a temperature control unit 94.

The temperature of the waste liquid 46 is set to a temperature T. The temperature measuring unit 95 measures the temperature T. The temperature measuring unit 95 may be provided in the circulation pipe 20 or may be provided inside the reaction tower 10. In this example, the temperature measuring unit 95 is provided in the circulation pipe 20. In this example, the temperature measuring unit 95 measures the temperature T of the waste liquid 46 flowing through the circulation pipe 20. The temperature measuring unit 95 may have a temperature sensor for measuring the temperature T of the waste liquid 46. The temperature sensor may be provided inside the circulation pipe 20.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the temperature T of the waste liquid 46 measured by the temperature measurement unit 95. In the present example, the calculation unit 74 calculates the solubility Dm of the waste liquid 46 at the temperature T of the waste liquid 46 measured by the temperature measurement unit 95, and calculates the amount (extraction amount M) of the waste liquid 46 stored in the storage unit 73 based on the calculated solubility Dm. The calculation unit 74 may calculate the amount of the waste liquid 46 (draw-out amount M) based on the temperature T of the waste liquid 46 measured by the temperature measurement unit 95 so that the concentration of the solute S is higher than the solubility Dm at the temperature T. The storage unit 73 stores the amount of the waste liquid 46 calculated by the calculation unit 74, thereby easily suppressing the precipitation of the solute S in the inside of the reaction tower 10, the circulation pipe 20, and the storage unit 73.

As shown in fig. 4, the arithmetic unit 74 may store in advance a relationship between the solubility Dm of the solute S and the temperature T of the solvent Sv. The calculation unit 74 may calculate the minimum value Mmin of the extraction amount M of the waste liquid 46 corresponding to the measured temperature T of the waste liquid 46, based on the relationship between the temperature T of the waste liquid 46 measured by the temperature measurement unit 95 and the stored solubility Dm and temperature T. The discharge pump 61 can control the amount of the waste liquid 46 discharged from the first water storage portion 71 to the second water storage portion 75 per unit time to be equal to or more than the minimum value Mmin.

The temperature control unit 94 controls the temperature T of the waste liquid 46. Temperature controller 94 may control the temperature of waste liquid 46 based on the sulfur (S) concentration of waste liquid 46 calculated by calculator 74. The sulfur (S) concentration of the waste liquid 46 may be the sulfur (S) concentration calculated by the calculation unit 74 based on the sulfur (S) concentration measured by the first sulfur concentration measurement unit 80. The sulfur (S) concentration of the waste liquid 46 may be the sulfur (S) concentration calculated by the calculation unit 74 based on the sulfur (S) concentration measured by at least one of the first sulfur concentration measurement unit 80-1 and the first sulfur concentration measurement unit 80-2 and the sulfur (S) concentration measured by the first sulfur concentration measurement unit 80-3.

The sulfur (S) concentration of the waste liquid 46 is the sulfur (S) concentration calculated by the calculation unit 74, and may be the sulfur (S) concentration calculated based on the flow rate of the exhaust gas 30 measured by the gas flow rate measurement unit 82. The sulfur (S) concentration of the waste liquid 46 may be the sulfur (S) concentration calculated by the calculation unit 74, or may be the sulfur (S) concentration calculated based on the consumption amount of the fuel 96 measured by the gas flow rate measurement unit 98. The sulfur (S) concentration of the waste liquid 46 may be the sulfur (S) concentration calculated by the calculation unit 74, or may be the sulfur (S) concentration calculated based on the consumption amount of the fuel 96 measured by the consumption amount measurement unit 98 and the sulfur (S) concentration of the fuel 96 measured by the second sulfur concentration measurement unit 99. The sulfur (S) concentration of the waste liquid 46 may be the sulfur (S) concentration calculated by the calculation unit 74, or may be the sulfur (S) concentration calculated based on the output P of the power unit 50 measured by the output measurement unit 52.

The temperature control unit 94 may control the temperature T of the waste liquid 46 based on the relationship between the sulfur (S) concentration of the waste liquid 46 calculated by the calculation unit 74, the temperature T of the waste liquid 46 measured by the temperature measurement unit 95, and the solubility Dm stored in the calculation unit 74, so as to prevent the concentration of the solute S from being greater than the solubility Dm. This makes it easy to suppress the precipitation of solute S in the interior of the reaction tower 10, the circulation pipe 20, and the storage unit 73.

The sulfur (S) concentration of the waste liquid 46 at a predetermined first time t1 is set to a first concentration D1. The sulfur (S) concentration of the waste liquid 46 at the second time t2 after a predetermined time has elapsed from the first time t1 is set as a second concentration D2. Temperature control unit 94 may control the temperature of waste liquid 46 based on first concentration D1 and second concentration D2.

The sulfur (S) concentration of the liquid 40 and the waste liquid 46 may increase by performing the above-described reactions of [ chemical formula 1] and [ chemical formula 2] while circulating the liquid 40 and the waste liquid 46 inside the reaction tower 10, the circulation pipe 20, and the storage section 73. When the sulfur (S) concentrations of the liquid 40 and the waste liquid 46 increase with the passage of time, the second concentration D2 is easily higher than the first concentration D1.

When the second concentration D2 is higher than the first concentration D1, the temperature controller 94 can lower the temperature of the waste liquid. Solute S is sodium carbonate (NaCO) ₃ ) And sodium sulfate (Na) ₂ SO ₄ ) In the case of at least one of them, as shown in fig. 4, the solubility Dm shows a maximum value at the temperature Tp of the solvent Sv. When the second concentration D2 is higher than the first concentration D1 and the temperature T of the waste liquid 46 is higher than the temperature Tp, the temperature controller 94 may lower the temperature of the waste liquid 46.

The temperature control portion 94 may control the temperature of the waste liquid 46 such that the temperature T of the waste liquid 46 is higher than a predetermined temperature. The predetermined temperature may be a temperature Tp shown in fig. 4. As shown in FIG. 4, when solute S is sodium carbonate (NaCO) ₃ ) And sodium sulfate (Na) ₂ SO ₄ ) In the case of at least one of them, the rate of decrease in the solubility Dm at a temperature less than Tp (the amount of decrease in the solubility Dm at every 1 ℃ C. decrease in temperature) is greater than the rate of decrease in the solubility Dm at a temperature equal to or higher than Tp. Therefore, the temperature T of the waste liquid 46 is preferably equal to or higher than the temperature Tp. Since the temperature controller 94 controls the temperature T of the waste liquid 46 so that the temperature T of the waste liquid 46 becomes equal to or higher than the temperature Tp, the precipitation of the solute S in the interior of the reaction tower 10, the circulation pipe 20, and the storage unit 73 is easily suppressed.

Fig. 6 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example differs from the exhaust gas treatment device 100 shown in fig. 5 in that it further includes a conductivity measurement unit 92.

The conductivity measuring section 92 measures the electrical conductivity σ of the waste liquid 46. The conductivity measuring unit 92 of the present example is provided in the wastewater pipe 20. Conductivity measuring unit 92 in this example is provided outside storage unit 73.

Fig. 7 is a graph qualitatively showing a relationship between the concentration D of the solute S dissolved in the waste liquid 46 and the electrical conductivity σ of the waste liquid 46. The electrical conductivity σ of the waste liquid 46 is likely to change based on the sulfur (S) concentration of the waste liquid 46. When solute S is sodium carbonate (NaCO) ₃ ) And sodium sulfate (Na) ₂ SO ₄ ) In the case of at least one of the above, the electrical conductivity σ easily shows the maximum value σ m at the predetermined concentration D. The predetermined concentration D of the solute S is set to a concentration Dp. A concentration region where the concentration D is equal to or less than the concentration Dp is defined as a region A, and a concentration region where the concentration D > the concentration Dp is defined as a region B.

In the exhaust gas treatment device 100, the concentration D of the solute S in the waste liquid 46 is likely to change in the region a. In the exhaust gas treatment device 100 of the present example, the concentration D of the solute S dissolved in the waste liquid 46 is easily distributed in the region a. That is, in the exhaust gas treatment device 100 of the present example, the higher the concentration of the solute S, the more easily the electrical conductivity σ of the waste liquid 46 increases.

Fig. 8 is a diagram showing an example of a waveform of a temporal change in the electrical conductivity σ of the waste liquid 46. Fig. 8 qualitatively shows the relationship between the elapsed time t after the start of the circulation of the liquid 40 and the waste liquid 46 in the reaction tower 10, the circulation pipe 20, and the storage unit 73 and the electrical conductivity σ of the liquid 40 and the waste liquid 46. Fig. 8 is a waveform from time t1 to time t2, which is a waveform showing a temporal change in the electrical conductivity σ of the waste liquid 46.

In fig. 8, when the amount M of the waste liquid 46 drawn out per unit time is zero, and M1 and M2 (> M1) of the reservoir 73, the relationship between the elapsed time t and the electrical conductivity σ of the waste liquid 46 is shown by a broken line, a chain line, and a two-dot chain line, respectively. The case where the extraction amount of the waste liquid 46 is zero is a case where the waste liquid 46 is not extracted.

As described above, the waste liquid 46 repeats the chemical reactions shown in [ chemical formula 1] and [ chemical formula 2] above. Therefore, the sulfur (S) concentration of the waste liquid 46 easily increases with the lapse of time t. Therefore, the electrical conductivity σ of the waste liquid 46 easily increases with the lapse of time t.

The electrical conductivities σ at the time t1 when the extraction amount M per unit time of the waste liquid 46 was zero, M1 and M2 (> M1) were σ 0-1, σ 1-1 and σ 2-1, respectively. The electrical conductivities σ at time t1 when the extraction amount M per unit time of the waste liquid 46 was zero and M1 and M2 (> M1) were σ 0-1, σ 1-1 and σ 2-1, respectively.

When the extraction amount M per unit time of the waste liquid 46 is zero, the increase in the electrical conductivity σ between the time t1 and the time t2 is defined as σ 0i (═ σ 0-2) - (σ 0-1). When the extraction amount M per unit time of the waste liquid 46 is M1, the increase in the electrical conductivity σ from the time t1 to the time t2 is defined as σ 1i (═ σ 1-2) - (σ 1-1). When the extraction amount M per unit time of the waste liquid 46 is M2, the increase in the electrical conductivity σ from the time t1 to the time t2 is defined as σ 2i (═ 2-2) - (σ 2-1).

From time t1 to time t2, the increase in the sulfur (S) concentration of the waste liquid 46 when the extraction amount is M1 or when the extraction amount is M2 tends to be smaller than the increase in the sulfur (S) concentration of the waste liquid 46 when the extraction amount is zero. Therefore, from time t1 to time t2, the increase σ 1i and the increase σ 2i easily become larger than the increase σ 0 i.

From time t1 to time t2, the increase in the sulfur (S) concentration of the waste liquid 46 in the case where the extraction amount is M1 tends to be larger than the increase in the sulfur (S) concentration of the waste liquid 46 in the case where the extraction amount is M2. Therefore, from time t1 to time t2, the increase σ 1i easily becomes larger than the increase σ 2 i.

The explanation will be made with reference to fig. 6 again. The exhaust gas treatment device 100 may further include a waveform acquisition unit 91. The waveform acquiring unit 91 acquires a waveform indicating a temporal change in the electrical conductivity σ of the waste liquid 46. The waveform acquiring unit 91 acquires a waveform shown in fig. 8, for example.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on a waveform indicating a temporal change of the waste liquid 46. In the present example, the calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 per unit time based on the waveform indicating the temporal change of the waste liquid 46 acquired by the waveform acquisition unit 91. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 per unit time so that the electrical conductivity σ in the waveform acquired by the waveform acquisition unit 91 is equal to or less than the maximum value σ m (see fig. 7). The calculation unit 74 may calculate the extraction amount M of the waste liquid 46 stored in the storage unit 73 per unit time so that the electrical conductivity σ in the waveform acquired by the waveform acquisition unit 91 is equal to or less than a predetermined conductivity threshold value σ th, which is the maximum value σ M of the electrical conductivity σ. The arithmetic unit 74 may or may not store the conductivity threshold σ th.

The waste liquid 46 stored in the first water storage section 71 can be discharged to the second water storage section 75 in the drawn-out amount M. The pumped-out amount M of the waste liquid 46 can be led out from the first water storage section 71 to the second water storage section 75 by the pump 61. In the present example, the amount of the waste liquid 46 calculated by the calculation unit 74 is input to the lead-out pump 61. In the present example, the lead-out pump 61 controls the amount of the waste liquid 46 led out from the first water storage section 71 to the second water storage section 75 per unit time based on the amount of the waste liquid 46 calculated by the calculation section 74.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the time rate of change in the electrical conductivity σ of the waste liquid 46. In the present example, the calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 per unit time based on the waveform indicating the temporal change of the waste liquid 46 acquired by the waveform acquisition unit 91. The time rate of change in the electrical conductivity σ is represented as σ d.

When the extraction amounts of the waste liquid 46 per unit time were M1 and M2, the time change rates of the electrical conductivity σ were σ d1 and σ d2, respectively, from the time t1 to the time t 2.σ d1 ═ σ 1i/(t2-t1) · σ d2 ═ σ 2i/(t2-t1).

The calculation unit 74 may calculate the extraction amount M of the waste liquid 46 stored in the storage unit 73 per unit time so that the time change rate σ d of the electrical conductivity σ in the waveform acquired by the waveform acquisition unit 91 is equal to or less than a predetermined change rate threshold value σ dth. When the temporal change rate σ d1 is greater than the change rate threshold σ dth, the calculation unit 74 may calculate the extraction amount M1 of the waste liquid 46 so that the temporal change rate σ d1 is equal to or less than the change rate threshold σ dth. When the temporal change rate σ d2 is smaller than the change rate threshold σ dth, the calculation unit 74 may calculate the extraction amount M2 of the waste liquid 46 so that the temporal change rate σ d2 is maintained in a state of being smaller than the change rate threshold σ dth.

The time change rate σ d of the electrical conductivity σ may be a differential value of the electrical conductivity σ obtained based on the time t at any time. The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the differential value.

Fig. 9 is a diagram showing another example of a waveform of a temporal change in the electrical conductivity σ of the waste liquid 46. Fig. 9 is a waveform showing a time change in the electrical conductivity σ of the waste liquid 46, and a waveform from time t1 to time t4 elapses. The electrical conductivity σ of the waste liquid 46 from time t1 to time t4 was set to σ p1 to σ p4, respectively.

Fig. 10 is a diagram showing an example of a waveform of a temporal change in the output P of the power unit 50. Fig. 10 is a waveform of elapsed time from time t1 to time t4, among waveforms showing temporal changes in the output P of the power unit 50. The output P of the power unit 50 from time t1 to time t2 is assumed to be the output P2. The output P of the power unit 50 from time t3 to time t4 is set as the output P1 (< output P2).

The calculation section 74 may calculate the amount of the waste liquid 46 stored in the storage section 73 based on a waveform representing a temporal change in the electrical conductivity σ of the waste liquid 46 and a waveform representing a temporal change in the output P of the power unit 50. In the present example, the calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 per unit time based on the waveform indicating the temporal change of the waste liquid 46 acquired by the waveform acquisition unit 91 (see fig. 6).

The increase in the electrical conductivity σ from time t1 to time t2 was defined as σ p1i (σ p2- σ p 1). The increase in the electrical conductivity σ from time t3 to time t4 was defined as σ p2i (σ p4- σ p 3).

The time change rates of the electrical conductivity σ from the time t1 to the time t2 are σ dp1 and σ dp2, respectively. σ dp1 ═ σ p1i/(t2-t 1). σ dp2 ═ σ p2i/(t4-t 3).

The explanation will be made again returning to fig. 6. The greater the output P of the power plant 50, the greater the sulfur (S) concentration of the exhaust gas 30 discharged from the power plant 50 tends to become. Therefore, the temporal change rate σ dp1 of the electrical conductivity σ in the case of the output P2 is likely to be larger than the temporal change rate σ dp2 of the electrical conductivity σ in the case of the output P1. That is, the temporal change in the output P is easily correlated with the temporal change in the electrical conductivity σ.

When the output P2 is larger than the output P1 and the temporal change rate σ dp1 is larger than the temporal change rate σ dp2, the calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73. In the case where the temporal change in the output P is correlated with the temporal change in the electrical conductivity σ, the temporal change in the electrical conductivity σ of the waste liquid 46 is likely to be caused by the temporal change in the output P. Therefore, the calculation unit 74 can calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the waveform indicating the temporal change in the electrical conductivity σ of the waste liquid 46 and the waveform indicating the temporal change in the output P of the power plant 50, whereby the amount of the waste liquid 46 can be calculated more accurately than the case where the amount of the waste liquid 46 is calculated based on only the temporal change in the electrical conductivity σ of the waste liquid 46.

The amount of the waste liquid 46 calculated by the calculation unit 74 can be input to the lead-out pump 61 (see fig. 6). The discharge pump 61 may control the amount of the waste liquid 46 discharged from the first water storage unit 71 (see fig. 6) to the second water storage unit 75 (see fig. 6) per unit time based on the amount of the waste liquid 46 calculated by the calculation unit 74.

In fig. 10, time t1 is set as a first time, and time t2 is set as a second time. In fig. 9, the electrical conductivity σ p1 is set to the first electrical conductivity, and the electrical conductivity σ p2 is set to the second electrical conductivity. The conductivity measuring unit 92 may measure a first electrical conductivity σ p1 of the waste liquid 46 at a predetermined first time t1 and a second electrical conductivity σ p2 of the waste liquid 46 at a second time t2 after a predetermined time has elapsed from the first time.

Temperature control portion 94 may control a temperature T of waste liquid 46 based on the first electrical conductivity σ p1 and the second electrical conductivity σ p 2. In the case where the second electrical conductivity σ p2 is higher than the first electrical conductivity σ p1 (in the case of the example shown in fig. 9), the sulfur (S) concentration of the waste liquid 46 is likely to increase together with the elapsed time. When the second electrical conductivity σ p2 is higher than the first electrical conductivity σ p1, the temperature control portion 94 may lower the temperature T of the waste liquid 46. When the temperature T of the waste liquid 46 is equal to or higher than the temperature Tp (see fig. 4), the temperature control unit 94 may decrease the temperature T of the waste liquid 46 within a range in which the temperature T of the waste liquid 46 is not lower than the temperature Tp (see fig. 4).

When the temperature T of the waste liquid 46 is equal to or higher than the temperature Tp (see fig. 4), the temperature control unit 94 lowers the temperature T of the waste liquid 46, and the solubility Dm of the solute S is easily increased. This makes it easy to suppress the precipitation of solute S in the interior of the reaction tower 10, the circulation pipe 20, and the storage unit 73.

Fig. 11 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example is different from the exhaust gas treatment device 100 shown in fig. 6 in that a concentration measurement unit 90 is further provided.

The concentration measuring section 90 can measure the concentration of each element contained in the waste liquid 46. Each element contained in the waste liquid 46 is, for example, at least one of sulfur (S), nitrogen (N), and carbon (C). The concentration measuring unit 90 of the present example measures the sulfur (S) concentration of the waste liquid 46 stored in the second water storage unit 75. The concentration measuring unit 90 may be included in the storage unit 73, or may not be included in the storage unit 73. The concentration measuring unit 90 of the present example is included in the storage unit 73. The concentration measuring unit 90 may be provided in the circulation pipe 20.

The exhaust gas 30 discharged from the power plant 50 may contain Particulate Matter (PM) or the like. The Particulate Matter (PM) is also referred to as Black Carbon (BC). Particulate Matter (PM) is produced by incomplete combustion of fossil fuels. The Particulate Matter (PM) is fine particles containing carbon (C) as a main component. The Particulate Matter (PM) is, for example, coal.

The exhaust gas treatment device 100 may further include a separation unit 81 and a particulate matter storage unit 83. Particulate Matter (PM) contained in the exhaust gas 30 is referred to as particulate matter 35. The first water storage portion 71 can store the waste liquid 46 containing the granular matters 35. The waste stream 46 may be the waste stream 46 discharged from the reaction column 10. That is, the waste liquid 46 stored in the first water storage section 71 may be the waste liquid 46 flowing between the reaction tower 10 and the first water storage section 71 in the flow path of the waste liquid 46.

The waste liquid 46 containing the particulate matter 35 is introduced into the separation section 81. The separator 81 separates the particulate matter 35 from the moisture contained in the waste liquid 46. In this example, the waste liquid 46 stored in the first water storage portion 71 is introduced into the separation portion 81. First water storage unit 71 may introduce at least a part of waste liquid 46 introduced from circulation pipe 20 into first water storage unit 71 into separation unit 81. The first water storage part 71 may determine the amount of the waste liquid 46 introduced from the first water storage part 71 to the separation part 81 per unit time based on the concentration of the particulate matter 35 contained in the waste liquid 46 flowing through the circulation pipe 20.

In this example, the particulate matter 35 separated by the separating portion 81 is introduced into the particulate matter storing portion 83. The particulate matter storage portion 83 stores the particulate matter 35. In this example, a part of the waste liquid 46 separated by the separation unit 81 is introduced into the second storage unit 75 by the lead-out pump 61. The second water storage section 75 stores the waste liquid 46 from which at least a part of the particulate matter 35 is removed.

The particulate matter 35 stored in the particulate matter storage 83 may contain the waste liquid 46. The waste liquid 46 stored in the second water storage portion 75 may contain the particulate matter 35. The first granular material storage part 83 may be a sludge tank that stores the granular material 35 including the waste liquid 46. The second storage part 75 may be a storage tank that stores the waste liquid 46 including the granular matters 35. The waste liquid 46 stored in the second storage portion 75 may be the above-described drain water.

The separation section 81 may have a turbidity removing section 85 and a dewatering section 86. In this example, the waste liquid 46 stored in the first water storage section 71 is introduced into the turbidity removing section 85. The turbidity removing section 85 in this example removes the turbidity of the waste liquid 46 to lead out the waste liquid 46 from which the particulate matter 35-1 has been removed and the particulate matter 35-1. A part of the waste liquid 46 from which the particulate matter 35-1 is removed may be introduced into the second water storage part 75. The other part of the waste liquid 46 from which the particulate matter 35-1 is removed may be introduced into the dewatering section 86. The particulate matter 35-1 is at least a portion of the particulate matter 35.

In this example, the turbidity removing section 85 introduces the particulate matter 35-1 into the dewatering section 86. The dehydration unit 86 of the present example dehydrates the particulate matter 35-1 to remove the particulate matter 35-2. The particulate matter 35-2 may be introduced into the particulate matter storage 83.

The dehydration unit 86 may be a dehydrator that dehydrates water by centrifugal force of rotation. The particulate matter 35-1 includes waste liquid 46. The dehydration section 86 can dehydrate a part of the water contained in the waste liquid 46 by rotating the particulate matter 35-1. The dehydration unit 86 may be a heater that evaporates water by heating. The separation section 81 may not have the dewatering section 86.

In the present example, the conductivity measuring unit 92 and the waveform acquiring unit 91 are included in the storage unit 73. Conductivity measuring unit 92 may be provided between separation unit 81 and first water storage unit 71 in the flow path of waste liquid 46.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on the sulfur (S) concentration of the waste liquid 46 measured by the concentration measurement unit 90. In the present example, the calculation unit 74 calculates the sulfur (S) concentration of the waste liquid 46 based on the sulfur (S) concentration measured by the concentration measurement unit 90, and calculates the amount of the waste liquid 46 stored in the storage unit 73 based on the calculated sulfur (S) concentration. In the present example, the discharge pump 61 controls the amount of the waste liquid 46 discharged from the separation unit 81 to the second water storage unit 75 per unit time based on the amount of the waste liquid 46 calculated by the calculation unit 74.

In this example, the second water storage unit 75 stores the waste liquid 46 from which the particulate matter 35-1 is removed by the turbidity removing unit 85. Therefore, the sulfur (S) concentration of the waste liquid 46 stored in the second water storage unit 75 may be lower than the sulfur (S) concentration of the waste liquid 46 from which the particulate matter 35-1 is not removed. In the case where the sulfur (S) concentration of the waste liquid 46 is less than the predetermined concentration threshold Dth', the waste liquid 46 is likely to remove the harmful substances contained in the exhaust gas 30. In the case where the sulfur (S) concentration of the waste liquid 46 stored in the second water storage portion 75 is less than the concentration threshold Dth', the waste liquid 46 may be introduced into the interior of the reaction tower 10.

The exhaust gas treatment device 100 may further include a pump 62. In this example, in the case where the sulfur (S) concentration of the waste liquid 46 stored in the second water storage portion 75 is less than the concentration threshold Dth', the waste liquid 46 may be introduced into the first water storage portion 71 by the pump 62.

The calculation unit 74 may calculate the amount of the waste liquid 46 introduced from the second water storage unit 75 to the first water storage unit 71 based on the sulfur (S) concentration of the waste liquid 46 measured by the concentration measurement unit 90. The pump 62 controls the amount of the waste liquid 46 introduced from the second water storage unit 75 to the first water storage unit 71 per unit time based on the amount of the waste liquid 46 calculated by the calculation unit 74.

The calculation unit 74 may calculate the amount of the waste liquid 46 stored in the storage unit 73 based on at least one of the first sulfur concentration measurement unit 80-1 and the first sulfur concentration measurement unit 80-2 and at least one of the first sulfur concentration measurement unit 80-3 and the concentration measurement unit 90. The temperature controller 94 may control the temperature of the waste liquid 46 based on the sulfur (S) concentration of the waste liquid 46 calculated by the calculator 74, that is, the sulfur (S) concentration of the waste liquid 46 stored in the second water storage unit 75.

Fig. 12 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example includes a first sulfur concentration measurement unit 80, a gas flow rate measurement unit 82, a consumption amount measurement unit 98, a second sulfur concentration measurement unit 99, a calculation unit 74, and a derived amount control unit 84.

The first sulfur concentration measuring unit 80 of the present example measures the sulfur (S) concentration of the exhaust gas 30 (see fig. 3) treated with the liquid 40 (see fig. 3). The gas flow rate measuring unit 82 of the present example measures the flow rate of the exhaust gas 30 (see fig. 3). The consumption amount measuring unit 98 of the present example measures the consumption amount of the fuel 96 of the power plant 50 (see fig. 3). The second sulfur concentration measuring unit 99 of the present example measures the sulfur (S) concentration of the fuel 96 (see fig. 3).

The exhaust gas treatment device 100 may include a plurality of first sulfur concentration measurement units 80. The exhaust gas treatment device 100 of the present example includes 3 first sulfur concentration measurement units 80 (the first sulfur concentration measurement unit 80-1 (see fig. 3), the first sulfur concentration measurement unit 80-2 (see fig. 3), and the first sulfur concentration measurement unit 80-3 (see fig. 3)).

The sulfur (S) concentration measured by the first sulfur concentration measuring unit 80 is set as the sulfur concentration Ds 1. The flow rate of the exhaust gas 30 measured by the gas flow rate measuring unit 82 is defined as a flow rate Fg. The consumption amount of the fuel 96 measured by the consumption amount measuring unit 98 is referred to as a consumption amount C. The sulfur (S) concentration of the fuel 96 measured by the second sulfur concentration measuring station 99 is set as the sulfur concentration Ds 2.

The calculation unit 74 calculates the amount of the waste liquid 46 (see fig. 3) stored in the storage unit 73 (see fig. 3) per unit time based on at least one of the sulfur concentration Ds1, the consumption amount C, and the sulfur concentration Ds2, and the flow rate Fg. The amount of waste liquid 46 calculated by the calculation unit 74 may be introduced to the derived amount control unit 84. The lead-out amount controller 84 may control the amount of the waste liquid 46 led out from the first water storage unit 71 (see fig. 3) to the second water storage unit 75 (see fig. 3) per unit time to the amount of the waste liquid 46.

Fig. 13 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example includes a conductivity measurement unit 92, a waste liquid flow rate measurement unit 93, a temperature measurement unit 95, a calculation unit 74, and a derived amount control unit 84.

The conductivity measuring unit 92 of the present example measures the electrical conductivity σ (see fig. 6) of the waste liquid 46 (see fig. 6). The waste liquid flow rate measuring section 93 of this example measures the flow rate of the waste liquid 46. The temperature measuring unit 95 in this example measures the temperature T of the waste liquid 46.

The flow rate of the waste liquid 46 measured by the waste liquid flow rate measuring unit 93 is set to flow rate F1. The calculation unit 74 may calculate the amount of the waste liquid 46 (see fig. 6) stored in the storage unit 73 (see fig. 6) per unit time based on at least one of the electrical conductivity σ, the flow rate F1, and the temperature T. The calculation unit 74 may calculate the amount of the waste liquid 46 (see fig. 6) stored in the storage unit 73 (see fig. 6) per unit time based on at least one of the electrical conductivity σ, the conductivity threshold σ th, the flow rate F1, and the temperature T. The calculation unit 74 may calculate the amount of the waste liquid 46 based on the waveform indicating the temporal change in the electrical conductivity σ acquired by the waveform acquisition unit 91 (see fig. 6).

The amount of waste liquid 46 calculated by the calculation unit 74 may be introduced to the derived amount control unit 84. The lead-out amount controller 84 may control the amount of the waste liquid 46 led out from the first water storage unit 71 (see fig. 6) to the second water storage unit 75 (see fig. 6) per unit time to the amount of the waste liquid 46.

Fig. 14 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example includes a concentration measurement unit 90, a waste liquid flow rate measurement unit 93, a temperature measurement unit 95, a calculation unit 74, and a derived amount control unit 84.

In this example, the concentration measuring section 90 measures the sulfur (S) concentration of the waste liquid 46. The concentration measuring unit 90 can measure the sulfur (S) concentration of the waste liquid 46 stored in the second water storage unit 75 (see fig. 11).

The sulfur (S) concentration of the waste liquid 46 measured by the concentration measuring unit 90 is set as the sulfur concentration Ds 3. The arithmetic unit 74 may calculate the amount of the waste liquid 46 (see fig. 11) stored in the storage unit 73 (see fig. 11) per unit time based on at least one of the sulfur concentration Ds3, the flow rate F1, and the temperature T. The calculation unit 74 may calculate the amount of the waste liquid 46 (see fig. 11) stored in the storage unit 73 (see fig. 11) per unit time based on at least one of the sulfur concentration Ds3, the concentration threshold Dth', the flow rate F1, and the temperature T.

The amount of waste liquid 46 calculated by the calculation unit 74 may be introduced to the derived amount control unit 84. The lead-out amount control unit 84 may control the amount of the waste liquid 46 led out from the separation unit 81 (see fig. 11) to the second water storage unit 75 (see fig. 11) per unit time to the amount of the waste liquid 46.

Fig. 15 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example includes an output measurement unit 52, a first sulfur concentration measurement unit 80, a waste liquid flow measurement unit 93, a temperature measurement unit 95, a second sulfur concentration measurement unit 99, a calculation unit 74, and a derived amount control unit 84. The exhaust gas treatment device 100 of the present example further includes an exhaust gas amount calculation unit 87, an exhaust gas component analysis unit 88, and a water quality calculation unit 89.

The exhaust gas amount calculation unit 87 of the present example can calculate the amount of the exhaust gas 30 discharged from the power plant 50 based on the output P of the power plant 50 measured by the output measurement unit 52. The exhaust gas 30 contains Nitrogen Oxides (NO) _x ) Sulfur Oxide (SO) _x ) And the like. The exhaust gas component analyzing section 88 of the present example can analyze the components contained in the exhaust gas 30 based on the sulfur concentration Ds1 measured by the first sulfur concentration measuring section 80 and the sulfur concentration Ds2 measured by the second sulfur concentration measuring section 99. Analyzing the components contained in the exhaust gas 30 may refer to calculating the amount of each component contained in the exhaust gas 30.

The flow rate of the exhaust gas 30 calculated by the exhaust gas calculating unit 87 is set as a flow rate Fg'. The water quality calculation unit 89 of this example calculates the water quality of the waste liquid 46 based on the flow rate Fg', the flow rate F1, and the component of the exhaust gas 30 analyzed by the exhaust gas component analysis unit 88. The quality of the waste stream 46 may refer to the concentration of each component contained in the waste stream 46. The water quality calculation unit 89 may calculate the water quality of the waste liquid 46 based on the flow rate Fg measured by the gas flow rate measurement unit 82 (see fig. 12) instead of the flow rate Fg'.

The calculation unit 74 may calculate the amount of the waste liquid 46 (see fig. 5) stored in the storage unit 73 (see fig. 5) per unit time based on at least one of the flow rate F1, the temperature T, and the water quality of the waste liquid 46 calculated by the water quality calculation unit 89. The calculation unit 74 may calculate the amount of the waste liquid 46 (see fig. 5) stored in the storage unit 73 (see fig. 5) per unit time based on at least one of the flow rate F1, the temperature T, the concentration threshold Dth', and the water quality of the waste liquid 46 calculated by the water quality calculation unit 89.

The amount of waste liquid 46 calculated by the calculation unit 74 may be introduced to the derived amount control unit 84. The lead-out amount controller 84 may control the amount of the waste liquid 46 led out from the first water storage unit 71 (see fig. 5) to the second water storage unit 75 (see fig. 5) per unit time to the amount of the waste liquid 46.

Fig. 16 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example differs from the exhaust gas treatment device 100 shown in fig. 15 in that it further includes a concentration measurement unit 90, a waste liquid component analysis unit 65, and a concentration threshold value calculation unit 66.

The concentration measuring unit 90 in this example measures the concentrations De1 to DeN of the respective elements contained in the waste liquid 46. N is the kind of the element contained in the waste liquid 46, and is the number of the element measured by the concentration measuring unit 90. As described above, each element contained in the waste liquid 46 is, for example, at least one of sulfur (S), nitrogen (N), and carbon (C). The waste liquid component analyzing section 65 of the present example analyzes the concentrations De1 to DeN of the respective elements of the waste liquid 46 measured by the concentration measuring section 90. In addition, the above-described sulfur concentration Ds3 may be included in any one of the concentrations De1 to DeN.

Among the waste liquid 46, for example, the waste liquid 46 in the case where the plurality of elements are contained is referred to as a waste liquid 46-1. Among the waste liquid 46, the waste liquid 46 in the case where only sulfur (S) is contained is set as a waste liquid 46-2. The solubility Dm of the solute S in the waste liquid 46-1 may be different from the solubility Dm of the solute S in the waste liquid 46-2. Therefore, the concentration D of solute S precipitated in the waste liquid 46-1 may be different from the concentration D of solute S precipitated in the waste liquid 46-2.

The density threshold calculated by the density threshold calculation unit 66 is set as a density threshold Dth ". The concentration threshold Dth "may be the solubility Dm or may be a predetermined threshold value smaller than the solubility Dm. Even when the concentration threshold value Dth "is less than or equal to the solubility Dm, the concentration threshold value Dth" of the waste liquid 46-1 may be different from the concentration threshold value Dth "of the waste liquid 46-2.

The concentration threshold calculation unit 66 calculates the concentration threshold Dth "based on the concentrations De1 to DeN of the respective elements of the waste liquid 46 analyzed by the waste liquid component analysis unit 65. The concentration threshold value calculation unit 66 in this example calculates the concentration threshold value Dth "of the waste liquid 46-1. Therefore, the concentration threshold Dth ″ can be calculated more easily and accurately than the concentration threshold Dth ″ of the waste liquid 46-2 by the concentration threshold calculation unit 66.

The calculation unit 74 may calculate the amount of the waste liquid 46 (see fig. 11) stored in the storage unit 73 (see fig. 11) per unit time based on at least one of the water quality calculated by the water quality calculation unit 89, the flow rate F1, and the concentration threshold Dth ″. The amount of waste liquid 46 calculated by the calculation unit 74 may be introduced to the derived amount control unit 84. The lead-out amount controller 84 may control the amount of the waste liquid 46 led out from the first water reservoir 71 (see fig. 11) to the second water reservoir 75 (see fig. 11) per unit time to the amount of the waste liquid 46.

Fig. 17 is a diagram showing another example of the block diagram of the exhaust gas treatment device 100 according to the embodiment of the present invention. The exhaust gas treatment device 100 of the present example differs from the exhaust gas treatment device 100 shown in fig. 16 in that it further includes a gas flow rate measurement unit 82, a consumption amount measurement unit 98, a conductivity measurement unit 92, and a temperature control unit 94.

The calculation unit 74 may calculate the amount of the waste liquid 46 (see fig. 11) stored in the storage unit 73 (see fig. 11) per unit time based on at least one of the flow rate Fg, the consumption amount C, the electrical conductivity σ, and the water quality calculated by the water quality calculation unit 89, the flow rate F1, and the concentration threshold Dth ″. The amount of waste liquid 46 calculated by the calculation unit 74 may be introduced to the derived amount control unit 84. The lead-out amount controller 84 may control the amount of the waste liquid 46 led out from the first water reservoir 71 (see fig. 11) to the second water reservoir 75 (see fig. 11) per unit time to the amount of the waste liquid 46.

The calculation unit 74 may calculate the sulfur (S) concentration of the waste liquid 46 based on at least one of the flow rate Fg, the consumption amount C, the electrical conductivity σ, the water quality calculated by the water quality calculation unit 89, the flow rate F1, and the concentration threshold Dth ″. The temperature controller 94 may control the temperature of the waste liquid 46 based on the sulfur (S) concentration of the waste liquid 46 calculated by the calculator 74. The temperature control unit 94 may control the temperature of the waste liquid 46 based on the sulfur (S) concentration of the waste liquid 46-1.

The present invention has been described above with reference to the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes and modifications can be made in the above embodiments. The embodiments in which the above-described various changes and modifications are made are also included in the technical scope of the present invention, as apparent from the description of the claims.

Note that the execution order of each process such as the operation, the process, the step, and the stage in the apparatus, the system, the program, and the method shown in the claims, the description, and the drawings can be realized in any order unless "before", or the like is explicitly indicated, and also as long as the output of the previous process is not used in the subsequent process. In the operational flow in the claims, the specification, and the drawings, the description is made using "first", "next", and the like for convenience of description, but it is not necessarily meant to be carried out in this order.

[ item 1]

The exhaust gas treatment device may further include an exhaust gas amount calculation unit for calculating the amount of the exhaust gas, an exhaust gas component analysis unit for analyzing the component of the exhaust gas, and a water quality calculation unit for calculating the water quality of the waste liquid,

the exhaust gas amount calculation unit calculates the amount of exhaust gas discharged from the power unit based on the output of the power unit measured by the output measurement unit,

the exhaust gas component analyzing section analyzes components contained in the exhaust gas based on the sulfur concentration of the exhaust gas measured by the first sulfur concentration measuring section and the sulfur concentration of the fuel measured by the second sulfur concentration measuring section,

the water quality calculation unit calculates the water quality of the waste liquid based on the amount of the waste gas calculated by the waste gas amount calculation unit, the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit, and the component of the waste gas precipitated by the waste gas component analysis unit,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on at least one index of the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit, the temperature of the waste liquid measured by the temperature measurement unit, and the water quality of the waste liquid calculated by the water quality calculation unit.

[ item 2]

The exhaust gas treatment device may further include an exhaust gas amount calculation unit for calculating an amount of the exhaust gas, an exhaust gas component analysis unit for analyzing a component of the exhaust gas, a water quality calculation unit for calculating a water quality of the waste liquid, a waste liquid component analysis unit for analyzing a concentration of an element contained in the waste liquid, and a concentration threshold value calculation unit for calculating a concentration threshold value of the element contained in the waste liquid,

the concentration measuring section measures the concentrations of the respective elements contained in the waste liquid,

the waste liquid component analyzing section analyzes the concentrations of the respective elements of the waste liquid measured by the concentration measuring section,

the concentration threshold value calculation unit calculates a concentration threshold value based on the temperature of the waste liquid measured by the temperature measurement unit and the concentration of each element of the waste liquid precipitated by the waste liquid component analysis unit,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on at least one of the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit, the water quality of the waste liquid measured by the water quality measurement unit, and the concentration threshold calculated by the concentration threshold calculation unit.

[ item 3]

The exhaust gas treatment device according to item 2, wherein the calculation unit calculates the amount of the waste liquid stored in the storage unit based on at least one of the flow rate of the waste liquid, the water quality of the waste liquid, the concentration threshold, the flow rate of the exhaust gas measured by the gas flow rate measurement unit, the consumption amount of the fuel measured by the consumption amount measurement unit, and the electrical conductivity of the waste liquid measured by the conductivity measurement unit.

[ item 4]

The exhaust gas treatment device according to item 2, wherein the calculation unit calculates the sulfur concentration of the waste liquid based on at least one of the flow rate of the waste liquid, the water quality of the waste liquid, the concentration threshold, the flow rate of the exhaust gas measured by the gas flow rate measurement unit, the consumption amount of the fuel measured by the consumption amount measurement unit, and the electrical conductivity of the waste liquid measured by the conductivity measurement unit,

the temperature control unit may control the temperature of the waste liquid based on the sulfur concentration of the waste liquid calculated by the calculation unit.

Description of the reference symbols

10 reaction tower, 11 waste gas inlet, 12 trunk, 13 branch, 14 injection part, 15 side wall, 16 bottom, 17 waste gas outlet, 18 gas treatment part, 19 liquid outlet, 20 circulation pipe, 30 waste gas, 32 waste gas inlet pipe, 35 particulate matter, 40 liquid, 46 waste liquid, 50 power plant, 52 output measurement part, 60 circulation pump, 61 export pump, 62 pump, 65 waste liquid component analysis part, 66 concentration threshold value calculation part, 70 flow control part, 71 first water storage part, 72 valve, 73 storage part, 74 calculation part, 75 second water storage part, 76 supplement part, 77 purifying agent input part, 78 purifying agent, 80 first sulfur concentration, 81 separation part, 82 gas flow rate, 83 measurement part particulate matter storage part, 84 export control part, 85 turbidity removal part, 86 dehydration part, 87 waste gas quantity calculation part, 88 waste gas component analysis part, 89 water quality calculation part, a concentration measuring part 90, a waveform acquiring part 91, a conductivity measuring part 92, a waste liquid flow measuring part 93, a temperature control part 94, a temperature measuring part 95, fuel 96, fuel 97, a consumption measuring part 98, a second sulfur concentration measuring part 99 and a waste gas treating device 100.

Claims

1. An exhaust gas treatment device, comprising:

a reaction tower that introduces an exhaust gas containing sulfur, introduces a liquid for treating the exhaust gas, and discharges a waste liquid containing sulfur, which is a waste liquid obtained by treating the exhaust gas;

a storage unit for storing at least a part of the waste liquid discharged from the reaction tower; and

a calculation unit that calculates the amount of the waste liquid stored in the storage unit,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the waste liquid.

2. The exhaust gas treatment device according to claim 1,

further comprising a first sulfur concentration measuring section for measuring the sulfur concentration of the exhaust gas after the liquid treatment,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the exhaust gas measured by the first sulfur concentration measurement unit.

3. The exhaust gas treatment device according to claim 2,

the first sulfur concentration measuring section further measures the sulfur concentration of the exhaust gas introduced into the reaction tower,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the exhaust gas after the liquid treatment and the sulfur concentration of the exhaust gas introduced into the reaction tower.

4. The exhaust gas treatment device according to claim 2 or 3,

the reaction tower is provided with an exhaust gas outlet for discharging the exhaust gas treated by the liquid,

the first sulfur concentration measuring portion is provided at the exhaust gas outlet.

5. The exhaust gas treatment device according to any one of claims 1 to 4,

further comprises a gas flow rate measuring part for measuring the flow rate of the exhaust gas,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the flow rate of the exhaust gas measured by the gas flow rate measurement unit.

6. The exhaust gas treatment device according to any one of claims 1 to 5,

a power plant for discharging the exhaust gas; and

a consumption amount measuring unit for measuring the consumption amount of the fuel in the power plant,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the consumption amount of the fuel measured by the consumption amount measurement unit.

7. The exhaust gas treatment device according to claim 6,

further comprising a second sulfur concentration measuring section for measuring the sulfur concentration of the fuel,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the consumption amount of the fuel measured by the consumption amount measurement unit and the sulfur concentration of the fuel measured by the second sulfur concentration measurement unit.

8. The exhaust gas treatment device according to claim 6 or 7,

further comprises an output measuring unit for measuring the output of the power unit,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the output of the power unit measured by the output measurement unit.

9. The exhaust gas treatment device according to any one of claims 1 to 7,

further comprising a conductivity measuring section for measuring the electrical conductivity of the waste liquid,

the electrical conductivity of the spent liquor varies based on the sulfur concentration of the spent liquor,

the calculation section calculates the amount of the waste liquid stored in the storage section based on a waveform representing a temporal change in electrical conductivity of the waste liquid.

10. The exhaust gas treatment device according to claim 9,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on a temporal change in electrical conductivity of the waste liquid.

11. The exhaust gas treatment device according to claim 8,

the calculation portion calculates the amount of the waste liquid stored in the storage portion based on a waveform representing a temporal change in electrical conductivity of the waste liquid and a waveform representing a temporal change in the output of the power unit.

12. The exhaust gas treatment device according to claim 11,

also comprises a temperature control part for controlling the temperature of the waste liquid,

the conductivity measuring section measures a first electrical conductivity of the waste liquid at a predetermined first time and a second electrical conductivity of the waste liquid at a second time after a predetermined time has elapsed from the first time,

the temperature control portion controls a temperature of the waste liquid based on the first electrical conductivity and the second electrical conductivity.

13. The exhaust gas treatment device according to claim 12,

the temperature control portion reduces the temperature of the waste liquid in a case where the second electrical conductivity is higher than the first electrical conductivity.

14. The exhaust gas treatment device according to any one of claims 2 to 7,

the temperature control unit controls the temperature of the waste liquid based on the sulfur concentration of the waste liquid calculated by the calculation unit.

15. The exhaust gas treatment device of claim 14,

the calculation unit calculates a first concentration of sulfur at a predetermined first time and a second concentration of sulfur at a second time after a predetermined time has elapsed from the first time,

the temperature control unit controls the temperature of the waste liquid based on the first concentration and the second concentration.

16. The exhaust gas treatment device of claim 15,

the temperature control unit reduces the temperature of the waste liquid when the second concentration is higher than the first concentration.

17. The exhaust gas treatment device according to any one of claims 14 to 16,

the temperature control section controls the temperature of the waste liquid so that the temperature of the waste liquid is higher than a predetermined temperature.

18. The exhaust gas treatment device according to any one of claims 2 to 17,

further comprises a waste liquid flow rate measuring section for measuring the flow rate of the waste liquid,

the calculation unit calculates a sulfur concentration of the waste liquid, and calculates the amount of the waste liquid stored in the storage unit based on the calculated sulfur concentration of the waste liquid and the flow rate of the waste liquid measured by the waste liquid flow rate measurement unit.

19. The exhaust gas treatment device according to any one of claims 1 to 18,

further comprises a temperature measuring unit for measuring the temperature of the waste liquid,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the temperature of the waste liquid measured by the temperature measurement unit.

20. The exhaust gas treatment device according to any one of claims 1 to 19,

also comprises a concentration measuring part which is arranged on the device,

the exhaust gas also contains particulate matter,

the storage part has a first water storage part for storing the waste liquid containing the granular matters discharged from the reaction tower and a second water storage part for storing the waste liquid from which at least a part of the granular matters are removed,

the concentration measuring section measures the sulfur concentration of the waste liquid stored in the second water storage section,

the calculation unit calculates the amount of the waste liquid stored in the storage unit based on the sulfur concentration of the waste liquid measured by the concentration measurement unit.