CN111545026A - Low-temperature efficient desulfurization and denitrification device and method for flue gas - Google Patents

Low-temperature efficient desulfurization and denitrification device and method for flue gas Download PDF

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CN111545026A
CN111545026A CN202010395416.3A CN202010395416A CN111545026A CN 111545026 A CN111545026 A CN 111545026A CN 202010395416 A CN202010395416 A CN 202010395416A CN 111545026 A CN111545026 A CN 111545026A
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ammonia
flue gas
gas
desulfurization
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潘日喜
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Jiangsu Fengfeng Hongyun Environment Protect Technology Development Co ltd
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Jiangsu Fengfeng Hongyun Environment Protect Technology Development Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • 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
    • B01D53/02—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 adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B01D53/83—Solid phase processes with moving reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

Abstract

The invention discloses a low-temperature efficient desulfurization and denitrification device and a method for flue gas, wherein the low-temperature efficient desulfurization and denitrification device for flue gas comprises a flue gas exhaust pipe, a desulfurization system, a mixer, an ammonia preparation system, a denitrification system, a recovery system and an ammonia preparation tank, firstly, a fluidized desulfurizer is sprayed out through a nano hole in a powder spraying pipeline by using a compressed air assembly, is fully mixed and filtered with flue gas introduced by the flue gas exhaust pipe in a mixing filter, is introduced into the mixer, and is fully mixed with heated and dried ammonia gas; then the mixed gas after mixing passes through the active coke layer earlier and adsorbs sulfur dioxide gas, further carries out desulfurization treatment, secondly makes the mixed gas runs through a plurality of catalyst layers and carries out denitration reaction to utilize recovery system to retrieve the impurity that filters the flue gas and obtain with the active coke layer, the gas after will denitration reaction simultaneously passes through the system ammonia groove and then discharges into the atmosphere, can high-efficient SOx/NOx control, and reduce cost.

Description

Low-temperature efficient desulfurization and denitrification device and method for flue gas
Technical Field
The invention relates to the technical field of flue gas harmless treatment, in particular to a low-temperature efficient flue gas desulfurization and denitrification device and method.
Background
The nitrogen oxide treatment process in the industries of electric power, cement, glass and the like is quite mature, but the temperature of the coke oven flue waste gas discharged by a coke oven plant is relatively low, and NO is generatedX、SO2The content is relatively high, if the traditional denitration process is adopted, the low temperature and SO of the flue gas are bound to be influenced2The restriction of high content factors and the like can not meet the requirement of NO in the coking industryXAnd (5) emission standard requirements. However, the current technical means is to reduce SO2The influence on the low-temperature flue gas denitration efficiency leads the traditional desulfurization process in the denitration process, and ammonia gas is required to be provided independently, so that the desulfurization and denitration efficiency is reduced, and the cost is increased.
Disclosure of Invention
The invention aims to provide a low-temperature efficient flue gas desulfurization and denitrification device and method, which can efficiently perform desulfurization and denitrification and reduce the cost.
In order to achieve the above object, in a first aspect, the present invention provides a low-temperature high-efficiency desulfurization and denitrification device for flue gas, including a flue gas exhaust pipe, a desulfurization system, a mixer, an ammonia production system, a denitrification system, a recovery system and an ammonia production tank, where the desulfurization system includes a mixing filter, a desulfurizer storage tank, a fluidizing component and a compressed air component, the mixing filter is communicated with the flue gas exhaust pipe and is located at one side of the flue gas exhaust pipe, the fluidizing component is communicated with the mixing filter and is located at one side of the flue gas exhaust pipe, the desulfurizer storage tank is communicated with the fluidizing component and is located at one side of the fluidizing component, and the compressed air component is communicated with the fluidizing component and is located at one side far away from the flue gas exhaust pipe; the mixer is communicated with the mixing filter and is positioned on one side far away from the smoke exhaust pipe; the ammonia production system comprises an ammonia water storage tank, an evaporation pipe and a dryer, the dryer is communicated with the mixer and is positioned on one side of the mixer, the evaporation pipe is communicated with the dryer, is fixedly connected with the smoke exhaust pipe and is positioned on one side of the smoke exhaust pipe, and the ammonia water storage tank is communicated with the evaporation pipe and is positioned on one side far away from the dryer; denitration system includes box, active burnt layer and a plurality of catalyst layer, the catalyst layer is arc, the box with the blender intercommunication, and be located keep away from mix filter one side, active burnt layer with the box can be dismantled to be connected, and be located in the box, it is a plurality of the catalyst layer with the box can be dismantled to be connected, and is located active burnt layer with between the box, recovery system with mix the filter with active burnt layer is connected, and is located box one side, ammonia making groove with the box with aqueous ammonia storage jar intercommunication, and be located keep away from catalyst layer one side.
The mixed filter comprises a pipe wall, a plurality of powder spraying pipelines and a filter layer, wherein the pipe wall is communicated with the smoke exhaust pipe and is positioned on one side of the smoke exhaust pipe, the powder spraying pipelines penetrate through the pipe wall and are communicated with the fluidization assembly and are positioned far away from one side of the compressed air assembly, and the filter layer is fixedly connected with the pipe wall and is positioned far away from one side of the smoke exhaust pipe.
The mixing filter also comprises a collecting tank, wherein the collecting tank is detachably connected with the pipe wall and is positioned on one side far away from the filter layer.
The ammonia production system further comprises a plurality of ammonia injection grilles, and the plurality of ammonia injection grilles are communicated with the dryer and the mixer, penetrate through the mixer and are located on one side far away from the evaporation pipe.
The powder spraying pipeline and the ammonia spraying grid are both provided with a plurality of nano holes, and the nano holes are respectively positioned in the powder spraying pipeline and the ammonia spraying grid.
The denitration system further comprises a soot blower, wherein the soot blower is detachably connected with the box body and is positioned between the catalyst layer and the active coke layer.
The denitration system further comprises a filter disc, and the filter disc is detachably connected with the box body and is positioned between the soot blower and the catalyst layer.
The low-temperature efficient flue gas desulfurization and denitrification device further comprises an induced draft fan, wherein the induced draft fan is communicated with the ammonia making tank and is positioned far away from one side of the box body.
The low-temperature efficient flue gas desulfurization and denitrification device further comprises a control valve, wherein the control valve is connected with the ammonia preparation tank and is positioned between the ammonia preparation tank and the ammonia water storage tank.
In a second aspect, the invention provides a low-temperature high-efficiency desulfurization and denitrification method for flue gas, which comprises the following steps:
mixing and filtering the flue gas and the fluidized desulfurizer, and transmitting the flue gas and the fluidized desulfurizer to a mixer to be mixed with ammonia gas;
and carrying out denitration treatment on the mixed gas, and recycling and removing ammonia from the obtained waste product.
Wherein, after mixing the flue gas with the desulfurizer after the fluidization and filtering, transmit to the blender and mix with ammonia, include:
and (3) spraying the fluidized desulfurizer out through the nano holes in the powder spraying pipeline by using a compressed air assembly, fully mixing and filtering the desulfurizer and the flue gas introduced by the smoke discharge pipe in a mixing filter, introducing the mixture into a mixer, and fully mixing the mixture and the heated and dried ammonia.
Wherein, the mixed gas is denitrated, and the obtained waste products are recycled and discharged by removing ammonia, comprising the following steps:
and adsorbing sulfur dioxide gas by the mixed gas through an active coke layer, enabling the mixed gas to penetrate through a plurality of catalyst layers by using an induced draft fan to perform denitration reaction, recovering impurities obtained by filtering flue gas and the active coke layer by using a recovery system, and simultaneously discharging the gas after the denitration reaction into the atmosphere after passing through an ammonia preparation tank.
The invention relates to a low-temperature efficient desulfurization and denitrification device and a method for flue gas, wherein the low-temperature efficient desulfurization and denitrification device for flue gas comprises a flue gas exhaust pipe, a desulfurization system, a mixer, an ammonia preparation system, a denitrification system, a recovery system and an ammonia preparation tank, firstly, a fluidized desulfurizer is sprayed out through a nano hole in a powder spraying pipeline by using a compressed air assembly, and is fully mixed and filtered with flue gas introduced by the flue gas exhaust pipe in a mixing filter, and then introduced into the mixer to be fully mixed with heated and dried ammonia gas; then the mixed gas after mixing passes through the active coke layer earlier and adsorbs sulfur dioxide gas, further carries out desulfurization treatment, secondly makes the mixed gas run through a plurality of catalyst layers and carries out denitration reaction to utilize recovery system to retrieve the impurity that filters the flue gas and obtain with the active coke layer, the gas after will denitration reaction simultaneously passes through the system ammonia groove and then discharges into the atmosphere, can high-efficient SOx/NOx control, reduce cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a low-temperature high-efficiency flue gas desulfurization and denitrification device provided by the invention.
Fig. 2 is a rear view of fig. 1 provided by the present invention.
FIG. 3 is an enlarged view of a portion of FIG. 1A provided in accordance with the present invention.
FIG. 4 is an enlarged view of a portion of FIG. 1B provided in accordance with the present invention.
FIG. 5 is a schematic step diagram of a low-temperature efficient desulfurization and denitrification method for flue gas provided by the invention.
1-smoke exhaust pipe, 2-desulfurization system, 3-mixer, 4-ammonia production system, 5-denitration system, 6-recovery system, 7-ammonia production tank, 8-mixing filter, 9-desulfurizer storage tank, 10-fluidization component, 11-compressed air component, 12-ammonia water storage tank, 13-evaporation pipe, 14-dryer, 15-box, 16-active coke layer, 17-catalyst layer, 18-pipe wall, 19-powder spraying pipeline, 20-filter layer, 21-ammonia spraying grid, 22-nanopore, 23-soot blower, 24-induced draft fan, 25-control valve, 26-collecting tank and 27-filter plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 and 2, the invention provides a low-temperature high-efficiency desulfurization and denitrification device for flue gas, which comprises a flue gas discharge pipe 1, a desulfurization system 2, a mixer 3, an ammonia production system 4, a denitrification system 5, a recovery system 6 and an ammonia production tank 7, wherein the desulfurization system 2 comprises a mixing filter 8, a desulfurizer storage tank 9, a fluidizing component 10 and a compressed air component 11, the mixing filter 8 is communicated with the flue gas discharge pipe 1 and is positioned on one side of the flue gas discharge pipe 1, the fluidizing component 10 is communicated with the mixing filter 8 and is positioned on one side of the flue gas discharge pipe 1, the desulfurizer storage tank 9 is communicated with the fluidizing component 10 and is positioned on one side of the fluidizing component 10, and the compressed air component 11 is communicated with the fluidizing component 10 and is positioned on one side far away from the flue gas discharge pipe 1; the mixer 3 is communicated with the mixing filter 8 and is positioned on one side far away from the smoke exhaust pipe 1; the ammonia production system 4 comprises an ammonia water storage tank 12, an evaporation pipe 13 and a dryer 14, the dryer 14 is communicated with the mixer 3 and is positioned on one side of the mixer 3, the evaporation pipe 13 is communicated with the dryer 14, is fixedly connected with the smoke exhaust pipe 1 and is positioned on one side of the smoke exhaust pipe 1, and the ammonia water storage tank 12 is communicated with the evaporation pipe 13 and is positioned on one side far away from the dryer 14; denitration system 5 includes box 15, active burnt layer 16 and a plurality of catalyst layer 17, catalyst layer 17 is arc, box 15 with 3 intercommunications of blender are located keep away from 8 one side of hybrid filter, active burnt layer 16 with box 15 can dismantle the connection, and lie in the box 15, it is a plurality of catalyst layer 17 with box 15 can dismantle the connection, and lie in active burnt layer 16 with between the box 15, recovery system 6 with hybrid filter 8 with active burnt layer 16 connects, and lies in box 15 one side, ammonia making tank 7 with box 15 with aqueous ammonia storage jar 12 intercommunication, and lie in keeping away from catalyst layer 17 one side.
In the present embodiment, flue gas is firstly introduced into the mixing filter 8 through the smoke exhaust pipe 1, then the desulfurizer stored in the desulfurizer storage tank 9 is fluidized by the fluidization component 10 in the desulfurization system 2, and then the fluidized desulfurizer is sprayed into the mixing filter 8 through the compressed air component 11 to be mixed with the flue gas, while the desulfurizer is usually sodium bicarbonate powder, and can react with sulfur dioxide in the flue gas to generate sodium sulfite powder, because the sodium sulfite powder is harmful to human body, after the sodium sulfite powder is filtered by the mixing filter 8, the gas is introduced into the mixer 3 to be mixed with ammonia gas, and the ammonia gas is provided by the ammonia production system 4, and the ammonia water in the ammonia water storage tank 12 is firstly introduced into the evaporation pipe 13 by a pump or a motor, because the melting boiling point of ammonia water is low, ammonia gas can be evaporated by utilizing the high temperature of flue gas in the smoke exhaust pipe 1 to obtain ammonia gas and water vapor, the gas in the mixer 3 may have two types of oxynitride and sulfur dioxide, and the ammonia gas can generate ammonium sulfite with the sulfur dioxide under the condition of water vapor to influence the mixing condition of the ammonia gas and the oxynitride, so that the ammonia gas is dried by utilizing the dryer 14 before being introduced into the mixer 3 to absorb the mixer 3 in the ammonia gas, thereby ensuring the denitration efficiency; secondly, the mixed gas is led into the denitration system 5 for denitration treatment, in order to avoid sulfur dioxide in the gas, the gas firstly passes through the active coke layer 16 to adsorb the sulfur dioxide therein, the desulfuration efficiency is further ensured, then the gas passes through the multiple layers of arc-shaped catalyst layers 17 for denitration reaction, the contact area of the gas and the catalyst can be increased by adopting the arc-shaped catalyst layers 17 with the honeycomb structure, the denitration efficiency can be improved compared with the reaction time and the contact area of the traditional planar catalyst layers 17, then the gas remained after the reaction is led into the ammonia making tank 7, the ammonia gas remained in the gas is absorbed by utilizing the characteristic that the ammonia gas is dissolved in water, and can be prepared into ammonia water, the ammonia water is led into the ammonia water storage tank 12 for circular denitration, and the production cost is reduced. For the powder that mixed filter 8 filters and obtains, utilize recovery system 6 to carry out recovery processing, and recovery system 6 still will active burnt layer 16 retrieves, utilizes high temperature will the sulfur dioxide of active burnt layer 16 absorption carries out the desorption and makes the vulcanization product, improves energy utilization, has reduced manufacturing cost and has still guaranteed SOx/NOx control efficiency.
Further, the mixing filter 8 comprises a pipe wall 18, a plurality of powder spraying pipes 19 and a filter layer 20, the pipe wall 18 is communicated with the smoke exhaust pipe 1 and is positioned on one side of the smoke exhaust pipe 1, the powder spraying pipes 19 penetrate through the pipe wall 18 and are communicated with the fluidization assembly 10 and are positioned on one side far away from the compressed air assembly 11, and the filter layer 20 is fixedly connected with the pipe wall 18 and is positioned on one side far away from the smoke exhaust pipe 1.
In this embodiment, as shown in fig. 4, the fluidized desulfurizer is sprayed into the mixing filter 8 through a plurality of powder spraying pipelines 19, and is mixed with the gas introduced by the smoke exhaust pipe 1, so that the sprayed desulfurizer is always excessive, sulfur dioxide in the gas can be fully reacted with the desulfurizer, the desulfurization efficiency is ensured, the filter layer 20 is utilized to filter out the produced desulfurization powder and desulfurizer, the existence of no two kinds of powder in the gas introduced into the mixer 3 is ensured, the subsequent denitration efficiency is effectively ensured, and the powder generated by desulfurization is harmful to human body, so that the powder left after filtration is recovered, and secondary pollution is avoided.
Further, the mixing filter 8 further comprises a collecting trough 26, and the collecting trough 26 is detachably connected to the pipe wall 18 and located on a side away from the filter layer 20.
In the present embodiment, a collecting groove 26 is added in the mixing filter 8, and since the powder generated in the mixing filter 8 is harmful to human body, the powder filtered by the filtering layer 20 is collected in a concentrated manner, which facilitates the concentrated collection by the recovery system 6.
Further, the ammonia production system 4 further comprises a plurality of ammonia injection grills 21, and the plurality of ammonia injection grills 21 are communicated with the dryer 14 and the mixer 3, penetrate through the mixer 3 and are positioned on the side far away from the evaporation pipe 13.
In the present embodiment, the dried ammonia gas is injected into the mixer 3 through the plurality of ammonia injection grills 21, so that the injected ammonia gas has a wide range, contact with nitrogen oxides is increased, and denitration efficiency is improved, as shown in fig. 3.
Further, the powder spraying pipe 19 and the ammonia spraying grid 21 are both provided with a plurality of nano holes 22, and the plurality of nano holes 22 are respectively located in the powder spraying pipe 19 and the ammonia spraying grid 21.
In this embodiment, a plurality of nano holes 22 are respectively arranged in the powder spraying pipeline 19 and the ammonia spraying grid 21, and the orientations of the nano holes 22 can be asymmetric, the number can be designed by self, so that the coverage of the desulfurizer or ammonia sprayed through the nano holes 22 is wide, the molecular gap is small, the desulfurization degree of the desulfurizer and sulfur dioxide and the mixing degree of ammonia and nitrogen oxide are ensured, and the desulfurization and denitrification efficiency is improved.
Further, the denitration system 5 further comprises a soot blower 23, wherein the soot blower 23 is detachably connected with the box body 15 and is positioned between the catalyst layer 17 and the active coke layer 16.
In the present embodiment, the soot blower 23 removes dust on the surface of the catalyst layer 17 on the side close to the activated coke layer 16, thereby ensuring the activity of the catalyst and improving the denitration efficiency, and the removed dust drops on the activated coke layer 16, thereby facilitating the recovery processing by the recovery system 6.
Further, the denitration system 5 further comprises a filter 27, and the filter 27 is detachably connected with the box body 15 and is located between the soot blower 23 and the catalyst layer 17.
In the present embodiment, a filter 27 is added between the soot blower 23 and the catalyst layer 17 to further reduce dust in the gas passing through the activated coke layer 16, so that dust entering the catalyst layer 17 is reduced, thereby preventing excessive dust from affecting the catalytic efficiency of the catalyst layer 17 and ensuring the denitration efficiency of the denitration system 5.
Further, the low-temperature high-efficiency flue gas desulfurization and denitrification device further comprises an induced draft fan 24, wherein the induced draft fan 24 is communicated with the ammonia making tank 7 and is positioned far away from one side of the box body 15.
In this embodiment, the induced draft fan 24 is used to ensure that gas can pass through the catalyst layer 17 at a set speed, so as to ensure denitration efficiency, and the induced draft fan 24 is used to stably discharge gas, so as to ensure effective reaction.
Further, the low-temperature and high-efficiency flue gas desulfurization and denitrification device further comprises a control valve 25, wherein the control valve 25 is connected with the ammonia preparation tank 7 and is positioned between the ammonia preparation tank 7 and the ammonia water storage tank 12.
In this embodiment, since the ammonia tank 7 absorbs ammonia gas, PH paper or other acid-base detection methods can be used to detect the PH value in the ammonia tank 7, and after the water in the ammonia tank 7 is saturated, the control valve 25 is opened to make the liquid in the ammonia tank 7 flow into the ammonia water storage tank 12, and then evaporation and denitration treatment can be performed, so that the ammonia in the device can be recycled, the cost for purchasing ammonia water can be reduced, and the ammonia gas can be prevented from being discharged into the atmosphere to cause pollution.
Referring to fig. 5, the present invention provides a low-temperature high-efficiency desulfurization and denitrification method for flue gas, including:
and S101, mixing and filtering the flue gas and the fluidized desulfurizer, and transmitting the flue gas to a mixer 3 to be mixed with ammonia gas.
Specifically, firstly, the flue gas generated in the boiler is discharged through the smoke exhaust pipe 1, then the fluidized desulfurizer is sprayed out through the nano holes 22 in the powder spraying pipeline 19 by using the compressed air assembly 11, wherein the desulfurizer usually adopts sodium bicarbonate powder, the sodium bicarbonate powder is fluidized, the powder is conveniently sprayed out from the nano holes 22 by using the compressed air assembly 11 and is conveniently and fully mixed with sulfur dioxide gas in the flue gas, the sodium bicarbonate powder and the sulfur dioxide gas are mixed to easily obtain sodium sulfite powder, and the sodium sulfite powder is harmful to human body, so the powder is filtered by using the filter layer 20 in the mixing filter 8, then the powder is led into the mixer 3 and is fully mixed with heated and dried ammonia gas, and ammonia gas and water vapor can be obtained after the ammonia water is heated under the condition of water vapor, sulfur dioxide reacts with ammonia gas to affect the denitration efficiency, so that the ammonia gas is dried before being introduced into the mixer 3, and the denitration efficiency is ensured; and the heating of ammonia utilizes the flue gas in discharging fume pipe 1 is from the high temperature of taking, practices thrift the running cost to the ammonia is spout from the nanopore 22 in ammonia injection grid 21, can increase the area of contact with the flue gas, increases the mixed degree, guarantees orderly denitration efficiency.
S102, carrying out denitration treatment on the mixed gas, and recycling and removing ammonia from the obtained waste product for discharge.
Specifically, the mist after will mixing passes through active coke layer 16 earlier and adsorbs sulfur dioxide gas, can further reduce sulfur dioxide's emission, improves desulfurization efficiency, then utilizes draught fan 24 to make the mist runs through a plurality of catalyst layers 17 in proper order and carries out denitration reaction, catalyst layer 17 is circular-arcly, can increase with gaseous area of contact and time, improves denitration efficiency to can also utilize soot blower 23 to clear away by the dust that gas brought on catalyst layer 17 guarantees catalyst activity and catalytic efficiency. Finally, a recovery system 6 is utilized to recover sodium sulfite impurities obtained by filtering flue gas and the active coke layer 16, sodium sulfite powder obtained by the mixing filter 8 and the active coke layer 16 are recovered, so that the overflow of sulfides is avoided, secondary pollution is avoided, sulfides can be recycled, and the energy utilization rate is improved; meanwhile, after the gas after the denitration reaction passes through the ammonia preparation tank 7, ammonia water is prepared by utilizing the characteristic that ammonia gas is dissolved in water, the prepared ammonia water can be heated and dried to perform the denitration reaction, and then the residual gas is discharged into the atmosphere, so that the cost is reduced, and the environmental pollution is reduced.
The invention relates to a low-temperature efficient desulfurization and denitrification device and a method for flue gas, wherein the low-temperature efficient desulfurization and denitrification device for flue gas comprises a flue gas exhaust pipe 1, a desulfurization system 2, a mixer 3, an ammonia preparation system 4, a denitrification system 5, a recovery system 6 and an ammonia preparation tank 7, firstly, a fluidized desulfurizer is sprayed out through a nano hole 22 in a powder spraying pipeline 19 by using a compressed air assembly 11, and is fully mixed and filtered with flue gas introduced by the flue gas exhaust pipe 1 in a mixing filter 8, and then introduced into the mixer 3 to be fully mixed with heated and dried ammonia gas; then the mixed gas after mixing passes through active coke layer 16 earlier and adsorbs sulfur dioxide gas, further carries out desulfurization treatment, secondly makes the mixed gas run through a plurality of catalyst layers 17 and carries out denitration reaction to utilize recovery system 6 to retrieve the impurity that filters the flue gas and active coke layer 16, the gas after will denitration reaction passes through ammonia making groove 7 back and discharges into the atmosphere simultaneously, can high-efficient SOx/NOx control, and reduce cost.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The low-temperature efficient desulfurization and denitrification device for the flue gas is characterized by comprising a flue gas exhaust pipe, a desulfurization system, a mixer, an ammonia making system, a denitrification system, a recovery system and an ammonia making tank, wherein the desulfurization system comprises a mixing filter, a desulfurizer storage tank, a fluidizing component and a compressed air component, the mixing filter is communicated with the flue gas exhaust pipe and is positioned on one side of the flue gas exhaust pipe, the fluidizing component is communicated with the mixing filter and is positioned on one side of the flue gas exhaust pipe, the desulfurizer storage tank is communicated with the fluidizing component and is positioned on one side of the fluidizing component, and the compressed air component is communicated with the fluidizing component and is positioned on one side far away from the flue gas exhaust pipe; the mixer is communicated with the mixing filter and is positioned on one side far away from the smoke exhaust pipe; the ammonia production system comprises an ammonia water storage tank, an evaporation pipe and a dryer, the dryer is communicated with the mixer and is positioned on one side of the mixer, the evaporation pipe is communicated with the dryer, is fixedly connected with the smoke exhaust pipe and is positioned on one side of the smoke exhaust pipe, and the ammonia water storage tank is communicated with the evaporation pipe and is positioned on one side far away from the dryer; denitration system includes box, active burnt layer and a plurality of catalyst layer, the catalyst layer is arc, the box with the blender intercommunication, and be located keep away from mix filter one side, active burnt layer with the box can be dismantled to be connected, and be located in the box, it is a plurality of the catalyst layer with the box can be dismantled to be connected, and is located active burnt layer with between the box, recovery system with mix the filter with active burnt layer is connected, and is located box one side, ammonia making groove with the box with aqueous ammonia storage jar intercommunication, and be located keep away from catalyst layer one side.
2. The low-temperature high-efficiency flue gas desulfurization and denitrification device according to claim 1, wherein the mixing filter comprises a pipe wall, a plurality of powder spraying pipes and a filter layer, the pipe wall is communicated with the smoke exhaust pipe and is positioned on one side of the smoke exhaust pipe, the plurality of powder spraying pipes penetrate through the pipe wall, are communicated with the fluidization assembly and are positioned on one side far away from the compressed air assembly, and the filter layer is fixedly connected with the pipe wall and is positioned on one side far away from the smoke exhaust pipe.
3. The low-temperature high-efficiency desulfurization and denitrification device for flue gas as claimed in claim 2, wherein the ammonia production system further comprises a plurality of ammonia injection grids, and the plurality of ammonia injection grids are communicated with the dryer and the mixer, penetrate through the mixer and are positioned on the side far away from the evaporation pipe.
4. The low-temperature high-efficiency flue gas desulfurization and denitrification device according to claim 3, wherein the powder spraying pipeline and the ammonia spraying grid are respectively provided with a plurality of nanopores, and the nanopores are respectively positioned in the powder spraying pipeline and the ammonia spraying grid.
5. The low-temperature high-efficiency desulfurization and denitrification device for flue gas as claimed in claim 1, wherein the denitrification system further comprises a soot blower, and the soot blower is detachably connected with the box body and is positioned between the catalyst layer and the active coke layer.
6. The low-temperature high-efficiency flue gas desulfurization and denitrification device of claim 1, further comprising an induced draft fan, wherein the induced draft fan is communicated with the ammonia preparation tank and is positioned on one side far away from the box body.
7. The low-temperature high-efficiency desulfurization and denitrification device for flue gas as claimed in claim 6, further comprising a control valve, wherein the control valve is connected with the ammonia making tank and is positioned between the ammonia making tank and the ammonia water storage tank.
8. A low-temperature efficient desulfurization and denitrification method for flue gas is characterized by comprising the following steps:
mixing and filtering the flue gas and the fluidized desulfurizer, and transmitting the flue gas and the fluidized desulfurizer to a mixer to be mixed with ammonia gas;
and carrying out denitration treatment on the mixed gas, and recycling and removing ammonia from the obtained waste product.
9. The method for low-temperature and high-efficiency desulfurization and denitrification of flue gas according to claim 8, wherein the step of mixing and filtering the flue gas and the fluidized desulfurizer, and then conveying the flue gas to a mixer to be mixed with ammonia gas comprises the following steps:
and (3) spraying the fluidized desulfurizer out through the nano holes in the powder spraying pipeline by using a compressed air assembly, fully mixing and filtering the desulfurizer and the flue gas introduced by the smoke discharge pipe in a mixing filter, introducing the mixture into a mixer, and fully mixing the mixture and the heated and dried ammonia.
10. The method for low-temperature and high-efficiency desulfurization and denitrification of flue gas as claimed in claim 9, wherein the denitration treatment of the mixed gas and the recovery and ammonia removal of the obtained waste products comprises the following steps:
and adsorbing sulfur dioxide gas by the mixed gas through an active coke layer, enabling the mixed gas to penetrate through a plurality of catalyst layers by using an induced draft fan to perform denitration reaction, recovering impurities obtained by filtering flue gas and the active coke layer by using a recovery system, and simultaneously discharging the gas after the denitration reaction into the atmosphere after passing through an ammonia preparation tank.
CN202010395416.3A 2020-05-12 2020-05-12 Low-temperature efficient desulfurization and denitrification device and method for flue gas Pending CN111545026A (en)

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Application publication date: 20200818