CN111135673A - Two-stage wet flue gas deacidification system and method - Google Patents
Two-stage wet flue gas deacidification system and method Download PDFInfo
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- CN111135673A CN111135673A CN202010099552.8A CN202010099552A CN111135673A CN 111135673 A CN111135673 A CN 111135673A CN 202010099552 A CN202010099552 A CN 202010099552A CN 111135673 A CN111135673 A CN 111135673A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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Abstract
The invention relates to the field of flue gas deacidification and hazardous waste disposal, in particular to a two-stage wet flue gas deacidification system and a method, wherein the system comprises a precooling tower, a precooling spray gun, a precooling water tank, a precooling water heat exchanger, a washing tower and a smoke passing pipe; the smoke passing pipe is arranged in a certain elevation angle, the lower end of the smoke passing pipe is connected with the bottom of the pre-cooling tower, the elevation end of the smoke passing pipe is connected with the washing tower, and the smoke passing pipe is also provided with a demisting device; the pre-cooling tower is connected with a high-temperature flue gas fan, and the washing tower is connected with an alkali liquor replenishing pump and is connected with a flue gas heater; by adopting the invention, the clear water pre-cooling tower and the alkali liquor washing tower carry out two-stage deacidification, so that the alkali liquor consumption of a two-stage washing device can be reduced; the pre-cooling water heat exchanger 4 is arranged to improve the deacidification efficiency of the pre-cooling tower; the absorption liquid in the pre-cooling tower is changed into an acidic solution, so that waste is changed into valuable, and the production cost of enterprises is further reduced; compared with the traditional wet deacidification process, the method can reduce the discharge of more than 80% of salt-containing wastewater and greatly reduce the wastewater treatment load.
Description
Technical Field
The invention relates to the field of flue gas deacidification and hazardous waste disposal, in particular to a two-stage wet flue gas deacidification system and a two-stage wet flue gas deacidification method.
Background
The field is dealt with to solid useless, especially the useless burning of danger deals with the field, and flue gas deacidification is an indispensable key ring. The elements of S, CL, F and the like contained in the incineration materials finally enter the flue gas in the form of acid gas, and in order to meet the standard emission requirement of the flue gas, a flue gas purification system must be provided with a wet deacidification system.
Present wet-type deacidification system adopts one-level deacidification system more, and wet-type deacidification tower from the bottom up divide into the triplex in proper order: cooling, deacidifying and demisting, wherein the following operation results are as follows: 1. a large amount of alkali liquor is consumed, so that the deacidification cost is greatly increased; 2. a large amount of high-salinity wastewater is generated, and the wastewater treatment load is increased; 3. the waste salt generated in the high-salinity wastewater treatment process is soluble waste salt, and no effective treatment means is available;
according to the landfill standard newly established in 2019, the landfill is prohibited when the content of soluble waste salt exceeds 5%. Therefore, it is necessary to provide a new wet deacidification process, which can reduce the generation of high-salt wastewater, reduce the usage of alkali liquor, reduce the cost, improve the benefit and reduce the efficiency while meeting the standard emission of flue gas.
Disclosure of Invention
In order to solve the technical problems, the invention provides a two-stage wet flue gas deacidification system and a two-stage wet flue gas deacidification method, which have the characteristics of integrating a two-stage washing system and precooling and washing, reducing the use amount of alkali liquor, reducing the treatment cost and reducing the treatment load.
In order to achieve the purpose, the invention adopts the following technical scheme:
a flue gas two-stage wet deacidification system and a method thereof, wherein the system comprises a precooling tower, a precooling spray gun penetrating the precooling tower, a precooling water tank arranged below the precooling tower, a precooling water heat exchanger for cooling precooling water, a washing tower and a smoke passing pipe; the precooling water heat exchanger is arranged on a precooling water circulating loop consisting of a precooling water tank, a precooling spray gun and a precooling tower and is connected with the precooling water tank and the precooling spray gun; an adjusting valve is arranged at the water inlet of the precooling spray gun; the smoke passing pipe is arranged in a certain elevation angle, the lower end of the smoke passing pipe is connected with the bottom of the pre-cooling tower, the elevation end of the smoke passing pipe is connected with the washing tower, and the smoke passing pipe is also provided with a demisting device; the pre-cooling tower is connected with the high-temperature flue gas fan, and the washing tower is connected with the alkali liquor replenishing pump and is connected with the flue gas heater.
Further, a water tank liquid inlet, a water tank liquid outlet and a water tank circulation port are formed in the precooling water tank; the liquid inlet of the water tank is connected with a water replenishing pump of the water tank, and the liquid outlet of the water tank is connected with an acid discharge pump; the water tank circulating port is connected with a precooling circulating pump, and the precooling circulating pump is connected with a precooling water heat exchanger; and the pre-cooling water tank is also provided with a water tank thermometer, a water tank liquid level meter and a water tank online PH densimeter.
Furthermore, the precooling water heat exchanger is provided with a circulating water feeding pump and a circulating water returning pump.
Furthermore, the washing tower is provided with a washing liquid inlet and a washing liquid outlet; the washing liquid inlet is connected with a washing water replenishing pump, and the washing liquid outlet is connected with a salt discharging pump; the bottom of the washing tower is connected with a washing circulating pump, and the washing circulating pump pumps washing liquid to the position above washing filler of the washing tower; a smoke demister is also arranged at the smoke outlet of the washing tower; and a washing thermometer, a washing liquid level meter and a washing online PH densimeter are further arranged at the bottom of the washing tower.
Furthermore, the precooling circulating pump and the washing circulating pump are arranged into two paths, and one path is started and the other path is standby.
Furthermore, pipe valves are connected between the precooling circulating pump, the washing circulating pump and the devices and are made of PTFE materials.
A two-stage wet flue gas deacidification method comprises the following steps:
step 1, starting a precooling heat exchanger to ensure that precooling water is kept below 55 ℃;
step 3, starting a high-temperature flue gas fan, enabling waste gas to be treated to enter a precooling tower, spraying cooling mist from the precooling spray gun in the step 2, and cooling the high-temperature flue gas to 70-80 ℃;
step 4, enabling the cooled flue gas to pass through a flue pipe, enabling precooled water to be in contact with high-temperature flue gas, cooling and reacting, enabling the cooled flue gas to enter the flue pipe, pumping the reacted precooled water into a precooled water heat exchanger through a precooling water tank through a precooling circulating pump, enabling the specific gravity of the precooled water in the precooled water tank to reach 1.05g/cm3 through a water tank online PH densimeter, a water tank thermometer and a water tank liquid level meter matched with a water tank water replenishing pump and an acid discharging pump, and enabling the HCl concentration in the precooled water to be about 10-15;
step 5, enabling the flue gas to pass through a flue gas pipe and a demisting device and enter a washing tower, and discharging the flue gas through a flue gas demister after the flue gas is subjected to alkali washing through the washing tower;
and step 6, matching a washing thermometer, a washing liquid level meter and a washing online PH densimeter arranged at the bottom of the washing tower with a washing water replenishing pump and a salt discharging pump, so that the pH value of the washing water is changed to 5.0-7.0.
Further, in the step 1, the outlet pressure of the pre-cooling water heat exchanger is ensured to be greater than 0.15 MPa.
Further, in the step 4, the liquid level of the pre-cooling water tank is controlled to be 500-1500 mm.
Furthermore, in the step 4, the amount of precooled water discharged each time is preferably 2 to 3 tons.
When the device works specifically, flue gas to be treated enters the precooling tower 2 from the high-temperature flue gas fan and contacts with precooling water downstream, the high-temperature flue gas at the temperature of 170 ℃ is rapidly cooled to 75 ℃, and meanwhile HCl and HF in the flue gas are partially absorbed by the precooling water. The cooled and deacidified flue gas passes through a smoke tube, is demisted by a demisting device and then enters a washing tower, and high-temperature precooling water enters a precooling water tank at the bottom of a precooling tower. Precooling water in the precooling water tank is sent out by a precooling circulating pump, the temperature of the precooling water is reduced to below 50 ℃ after heat exchange with circulating cooling water in a precooling water heat exchanger, the precooling water is atomized into small liquid drops through a precooling spray gun nozzle, and the small liquid drops enter a precooling tower to directly contact with high-temperature flue gas for heat exchange and temperature reduction. The spray gun is positioned at the top of the precooling tower, the water quantity of the spray gun can be adjusted through an adjusting valve 31 at the inlet of a hose of the spray gun, and the outlet temperature of the precooling tower is controlled; the washing tower is a packed tower and is provided with two layers of packing, SO that the alkali liquor is ensured to be fully contacted with the flue gas, and the residual acidic gases such as HCl, SO2 and HF in the flue gas are completely absorbed by the alkali liquor; by adopting the invention, the clear water pre-cooling tower and the alkali liquor washing tower carry out two-stage deacidification, the pre-cooling tower can absorb most of HCl and HF in the flue gas, the alkali liquor consumption of the secondary washing device can be reduced, and the deacidification cost is further reduced; the pre-cooling water heat exchanger 4 is arranged, so that the temperature of pre-cooling water is reduced, and the deacidification efficiency of the pre-cooling tower is effectively improved; acid gas in the flue gas is partially absorbed in the precooling tower, the absorption liquid is changed into acid solution, the main component is hydrochloric acid, and the method can be used for the workshop sections needing to adjust the pH value, such as a materialization workshop, a sewage treatment workshop and the like, so that waste is changed into valuable, and the production cost of enterprises is further reduced; as the alkali liquor consumption is reduced and the acid gas is partially absorbed in the precooling tower, the soluble waste salt in the deacidification wastewater is correspondingly greatly reduced, and compared with the traditional wet deacidification process, the method can reduce the discharge of more than 80 percent of salt-containing wastewater and greatly reduce the wastewater treatment load.
Drawings
FIG. 1 is a schematic structural diagram of a two-stage wet flue gas deacidification system and a two-stage wet flue gas deacidification method according to the present invention;
reference numerals: 1-precooling water tank, 11-water tank liquid outlet, 12-water tank liquid inlet, 13-water tank circulation port, 14-water tank online PH densimeter, 15-water tank thermometer, 16-water tank liquidometer, 17-precooling circulating pump, 18-acid discharge pump, 19-water tank water replenishing pump, 2-precooling tower, 3-precooling spray gun, 4-precooling water heat exchanger, 41-circulating water feeding pump, 42-circulating water returning pump, 5-smoke passing pipe, 6-washing tower, 61-smoke demister, 62-washing liquid inlet, 63-washing liquid outlet, 64-washing online PH densimeter, 65-washing thermometer, 66-washing liquidometer, 67-washing circulating pump, 68-salt discharge pump, 69-washing water replenishing pump, 7-alkali liquor replenishing pump, 8-flue gas heater, 9-flue gas heater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a two-stage wet flue gas deacidification system and a method thereof include a pre-cooling tower 2, a pre-cooling spray gun 3 penetrating in the pre-cooling tower 2, a pre-cooling water tank 1 arranged below the pre-cooling tower 2, a pre-cooling water heat exchanger 4 for cooling pre-cooling water, a washing tower 6 and a flue pipe 5; the pre-cooling water heat exchanger 4 is arranged on a pre-cooling water circulation loop consisting of the pre-cooling water tank 1, the pre-cooling spray gun 3 and the pre-cooling tower 2 and is connected with the pre-cooling water tank 1 and the pre-cooling spray gun 3; an adjusting valve 31 is arranged at the water inlet of the precooling spray gun 3; the smoke passing pipe 5 is arranged in a certain elevation angle, the lower end of the smoke passing pipe is connected with the bottom of the pre-cooling tower 2, the elevation end of the smoke passing pipe is connected with the washing tower 6, and the smoke passing pipe 5 is also provided with a demisting device 51; the pre-cooling tower 1 is connected with a high-temperature flue gas fan 9, and the washing tower 6 is connected with an alkali liquor replenishing pump 7 and is connected with a flue gas heater 8.
When the device works specifically, flue gas to be treated enters the precooling tower 2 from the high-temperature flue gas fan 9 and contacts with precooling water downstream, the high-temperature flue gas at the temperature of 170 ℃ is rapidly cooled to 75 ℃, and meanwhile HCl and HF in the flue gas are partially absorbed by the precooling water. The cooled and deacidified flue gas passes through a smoke pipe 5, is demisted by a demisting device 51 and then enters a washing tower 6, and high-temperature precooling water enters a precooling water tank 1 at the bottom of a precooling tower 2. Precooling water in the precooling water tank 1 is sent out by a precooling circulating pump 17, the temperature of the precooling water is reduced to below 50 ℃ after heat exchange with circulating cooling water in a precooling water heat exchanger 4, the precooling water is atomized into small liquid drops through a spray head of a precooling spray gun 3, and the small liquid drops enter a precooling tower 2 and directly contact with high-temperature flue gas for heat exchange and temperature reduction. The spray gun is positioned at the top of the pre-cooling tower 2, the water quantity of the spray gun can be adjusted through an adjusting valve 31 at the inlet of a hose of the spray gun, and the outlet temperature of the pre-cooling tower 2 is controlled; the washing tower 6 is a packed tower provided with two layers of packing to ensure the sufficient contact of the alkali liquor and the flue gas, the residual acid gases such as HCl, SO2, HF and the like in the flue gas are completely absorbed by the alkali liquor, and then the acid gases are heated by the flue gas heater 8 and discharged into the atmosphere through a chimney
By adopting the invention, the clear water pre-cooling tower 2 and the alkali liquor washing tower 6 carry out two-stage deacidification, the pre-cooling tower 2 can absorb most of HCl and HF in the flue gas, the alkali liquor consumption of a secondary washing device can be reduced, and the deacidification cost is further reduced; by arranging the pre-cooling water heat exchanger 4, the temperature of pre-cooling water is reduced, and the deacidification efficiency of the pre-cooling tower 2 is effectively improved; acid gas in the flue gas is partially absorbed in the precooling tower 2, the absorption liquid is changed into acid solution, the main component is hydrochloric acid, and the method can be used for the workshop sections needing to adjust the pH value, such as a materialization workshop, a sewage treatment workshop and the like, so that waste is changed into valuable, and the production cost of enterprises is further reduced; as the alkali liquor consumption is reduced and the acid gas is partially absorbed in the precooling tower, the soluble waste salt in the deacidification wastewater is correspondingly greatly reduced, and compared with the traditional wet deacidification process, the method can reduce the discharge of more than 80 percent of salt-containing wastewater and greatly reduce the wastewater treatment load.
Referring to fig. 1, a two-stage wet flue gas deacidification system and a method thereof are further provided, wherein a water tank inlet 12, a water tank outlet 11 and a water tank circulation port 13 are formed in the pre-cooling water tank 2; the water tank liquid inlet 12 is connected with a water tank water replenishing pump 19, and the water tank liquid outlet 11 is connected with an acid discharge pump 18; the water tank circulation port 13 is connected with a pre-cooling circulation pump 17, and the pre-cooling circulation pump 17 is connected with the pre-cooling water heat exchanger 4; the precooling water tank 1 is also provided with a water tank thermometer 15, a water tank liquid level meter 16 and a water tank online PH densimeter 14;
the precooling water tank 1 has the functions of temporarily storing precooling water and maintaining a certain liquid level to ensure the continuous circulation of the precooling water; the precooling water tank 1 is connected with the precooling tower 2, the material is the same as that of the precooling tower 2, and precooling water sprayed from the top of the precooling tower absorbs HCl and HF and then enters the precooling water tank 1 at the bottom of the tower; the device is provided with a water tank thermometer 15 and a water tank liquid level meter 16, when the water level of circulating cooling water in the pre-cooling water tank 1 is too low or acid solution is discharged from an acid discharge port 11, production water is timely supplemented to an operation liquid level through a liquid inlet 12, the acid concentration in the pre-cooling water tank 1 is detected in real time by a water tank online PH densimeter 14 and is interlocked with the valve arrangement on an acid discharge pipeline of the pre-cooling water tank 1, and when the acid concentration in the pre-cooling water tank 1 reaches a set value, the acid solution is timely discharged.
Further, the pre-cooling water heat exchanger 4 is provided with a circulating water feeding pump 41 and a circulating water returning pump 42; the pre-cooling water heat exchanger 4 is used for cooling pre-cooling water absorbing heat of the flue gas and transferring heat released by cooling the flue gas out of the system.
Further, the washing tower 6 is provided with a washing liquid inlet 62 and a washing liquid outlet 63; the washing liquid inlet 62 is connected with a washing water replenishing pump 69, and the washing liquid outlet 63 is connected with a salt discharging pump 68; the bottom of the washing tower 6 is connected with a washing circulating pump 67, and the washing circulating pump 67 pumps washing liquid to the upper part of the washing filler of the washing tower; a smoke demister 61 is also arranged at the smoke outlet of the washing tower 6; the bottom of the washing tower 6 is also provided with a washing thermometer 65, a washing liquid level meter 66 and a washing online PH densimeter 64;
the washing tower 6 further utilizes acid-base neutralization reaction to absorb acid gas in the flue gas by utilizing a sodium hydroxide solution, so that the standard emission of the flue gas is ensured; the top of the washing tower 6 is provided with a flue gas demister 61 to prevent liquid drops from being brought to a subsequent working section along with flue gas to corrode equipment; through washing online PH densimeter 64, real time monitoring pH value size, then supplementary alkali lye through controlling alkali lye supplementary pump 7, the washing liquid after the cooperation is discharged the reaction is discharged to the cooperation salt discharge mouth 63, with the general control of scrubbing tower 6pH value at 5 ~ 7, alkali lye is not basically reacted with CO2 under this condition, only takes place the reaction with the acid gas in the flue gas to effectively improve the utilization ratio of alkali lye, also reduced the product of high salt solution
Further, the pre-cooling circulation pump 17 and the washing circulation pump 67 are both provided with two paths, and one path is started and the other path is standby.
Preferably, pipe valves are connected between the pre-cooling circulating pump 17, the washing circulating pump 67 and the devices, and are made of PTFE materials; the polytetrafluoroethylene has excellent chemical stability, and does not corrode in the environment of strong acid, strong base, strong oxidant and organic solvent at normal temperature and high temperature; ultraviolet resistance, aging resistance and no embrittlement after long-term use; high-temperature resistance and long-term use at the temperature of not higher than 250 ℃.
Further, a two-stage wet flue gas deacidification method comprises the following steps:
step 1, starting a precooling heat exchanger 4 to ensure that precooling water is kept below 55 ℃;
step 3, starting a high-temperature flue gas fan 9, allowing waste gas to be treated to enter a precooling tower 2, spraying cooling mist from a precooling spray gun 3 in the step 2, and cooling the high-temperature flue gas to 70-80 ℃;
step 4, enabling the cooled flue gas to pass through a flue pipe 5, enabling pre-cooling water to be in contact with high-temperature flue gas, cooling and reacting, enabling the cooled flue gas to enter the flue pipe 5, pumping the pre-cooling water after reaction into a pre-cooling water heat exchanger 4 through a pre-cooling circulating pump 17 by a pre-cooling water tank 1, enabling the specific gravity of the pre-cooling water in the pre-cooling water tank 1 to reach 1.05g/cm3 through a water tank online pH densimeter 14, a water tank thermometer 15 and a water tank liquid level meter 16 in cooperation with a water tank water replenishing pump 19 and an acid discharge pump 18, and enabling the HCl concentration in;
step 5, the flue gas passes through a flue pipe 5 and a demisting device 51 and enters a washing tower 6, and the flue gas is subjected to alkali washing in the washing tower 6 and then is discharged through a flue gas demister 61;
and step 6, a washing thermometer 65, a washing liquid level meter 66 and a washing on-line PH densimeter 64 which are arranged at the bottom of the washing tower 6 are matched with a washing water replenishing pump 69 and a salt discharging pump 68, so that the pH value of the washing water is changed to 5.0-7.0.
Further, in the step 1, the outlet pressure of the pre-cooling water heat exchanger 4 is ensured to be greater than 0.15 MPa.
Further, in the step 4, the liquid level of the pre-cooling water tank 1 is controlled to be 500-1500 mm.
Further, in the step 4, the amount of precooled water discharged each time is preferably 2-3 tons.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A flue gas two-stage wet deacidification system and a flue gas two-stage wet deacidification method are characterized by comprising a pre-cooling tower (2), a pre-cooling spray gun (3) arranged in the pre-cooling tower (2) in a penetrating mode, a pre-cooling water tank (1) arranged below the pre-cooling tower (2), a pre-cooling water heat exchanger (4) used for cooling pre-cooling water, a washing tower (6) and a smoke passing pipe (5);
the pre-cooling water heat exchanger (4) is arranged on a pre-cooling water circulation loop composed of the pre-cooling water tank (1), the pre-cooling spray gun (3) and the pre-cooling tower (2) and is connected with the pre-cooling water tank (1) and the pre-cooling spray gun (3); an adjusting valve (31) is arranged at the water inlet of the precooling spray gun (3); the smoke passing pipe (5) is arranged at a certain elevation angle, the lower end of the smoke passing pipe is connected with the bottom of the pre-cooling tower (2), the elevation end of the smoke passing pipe is connected with the washing tower (6), and the smoke passing pipe (5) is also provided with a demisting device (51);
the pre-cooling tower (1) is connected with a flue gas heater (9), and the washing tower (6) is connected with an alkali liquor replenishing pump (7) and is connected with a flue gas heater (8).
2. The two-stage wet flue gas deacidification system and the two-stage wet flue gas deacidification method according to claim 1, wherein a water tank inlet (12), a water tank outlet (11) and a water tank circulation port (13) are formed in the pre-cooling water tank (2); the water tank liquid inlet (12) is connected with a water tank water replenishing pump (19), and the water tank liquid outlet (11) is connected with an acid discharge pump (18); the water tank circulation port (13) is connected with a precooling circulating pump (17), and the precooling circulating pump (17) is connected with the precooling water heat exchanger (4); and a water tank thermometer (15), a water tank liquid level meter (16) and a water tank online PH densimeter (14) are also arranged in the precooling water tank (1).
3. The two-stage wet flue gas deacidification system and method according to claim 1, wherein the pre-cooling water heat exchanger (4) is provided with a circulating water feeding pump (41) and a circulating water returning pump (42).
4. The two-stage wet flue gas deacidification system and the two-stage wet flue gas deacidification method according to the claim 1, wherein the washing tower (6) is provided with a washing liquid inlet (62) and a washing liquid outlet (63); the washing liquid inlet (62) is connected with a washing water replenishing pump (69), and the washing liquid outlet (63) is connected with a salt discharging pump (68); the bottom of the washing tower (6) is connected with a washing circulating pump (67), and the washing circulating pump (67) pumps washing liquid to the position above washing fillers of the washing tower; a smoke demister (61) is also arranged at the smoke outlet of the washing tower (6); the bottom of the washing tower (6) is also provided with a washing thermometer (65), a washing liquid level meter (66) and a washing online PH densimeter (64).
5. The two-stage wet flue gas deacidification system and method as claimed in claim 1, wherein the pre-cooling circulating pump (17) and the washing circulating pump (67) are arranged in two ways, one for starting and one for standby.
6. The two-stage wet flue gas deacidification system and method according to claim 1, wherein pipe valves are connected between the pre-cooling circulating pump (17), the washing circulating pump (67) and each device, and the pipe valves are made of PTFE (polytetrafluoroethylene).
7. A two-stage wet flue gas deacidification method is characterized by comprising the following steps:
step 1, starting a precooling heat exchanger (4) to ensure that precooling water is kept below 55 ℃;
step 2, adjusting an adjusting valve (31) for adjusting the water inlet and outlet of the precooling spray gun (3), and adjusting the spraying amount of the precooling water in the step 1;
step 3, starting a high-temperature flue gas fan (9), enabling waste gas to be treated to enter a precooling tower (2), spraying cooling mist from a precooling spray gun (3) in the step 2, and cooling the high-temperature flue gas to 70-80 ℃;
step 4, enabling the cooled flue gas to pass through a flue pipe (5), enabling pre-cooling water to be in contact with high-temperature flue gas, cooling and reacting, enabling the cooled flue gas to enter the flue pipe (5), pumping the pre-cooling water after reaction into a pre-cooling water heat exchanger (4) through a pre-cooling circulating pump (17) by a pre-cooling water tank (1), enabling the specific gravity of the pre-cooling water in the pre-cooling water tank (1) to reach 1.05g/cm3 through a water tank online pH densimeter (14), a water tank thermometer (15) and a water tank liquid level meter (16) in cooperation with a water tank water replenishing pump (19) and an acid discharge pump (18), and enabling the HCl concentration in the;
step 5, enabling the flue gas to pass through a flue pipe (5) and a demisting device (51) and enter a washing tower (6), and discharging the flue gas through a flue gas demister (61) after the flue gas is subjected to alkali washing in the washing tower (6);
and step 6, a washing thermometer (65), a washing liquid level meter (66) and a washing online PH density meter (64) which are arranged at the bottom of the washing tower (6) are matched with a washing water replenishing pump (69) and a salt discharging pump (68), so that the pH value of the washing water is changed to 5.0-7.0.
8. The two-stage wet flue gas deacidification method according to claim 7, wherein in the step 1, the outlet pressure of the pre-cooling water heat exchanger (4) is ensured to be greater than 0.15 MPa.
9. The two-stage wet flue gas deacidification method according to claim 7, wherein in the step 4, the liquid level of the pre-cooling water tank 1 is controlled to be 500-1500 mm.
10. The two-stage wet flue gas deacidification method according to claim 7, wherein in the step 4, the amount of pre-cooling water discharged each time is preferably 2 to 3 tons.
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| CN101063527A (en) * | 2006-04-13 | 2007-10-31 | 巴布考克及威尔考克斯公司 | Process for controlling the moisture concentration of a combustion flue gas |
| CN101634453A (en) * | 2009-08-31 | 2010-01-27 | 北京航天动力研究所 | Quenching process and quenching device of incineration smoke of waste liquid and waste gas containing chlorine |
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