CN114558448A - SCR (Selective catalytic reduction) process-based boiler external flue gas denitration device and process thereof - Google Patents
SCR (Selective catalytic reduction) process-based boiler external flue gas denitration device and process thereof Download PDFInfo
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- CN114558448A CN114558448A CN202210195491.4A CN202210195491A CN114558448A CN 114558448 A CN114558448 A CN 114558448A CN 202210195491 A CN202210195491 A CN 202210195491A CN 114558448 A CN114558448 A CN 114558448A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 121
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010531 catalytic reduction reaction Methods 0.000 title abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 129
- 238000002156 mixing Methods 0.000 claims description 49
- 229910021529 ammonia Inorganic materials 0.000 claims description 44
- 239000007789 gas Substances 0.000 claims description 44
- 239000000428 dust Substances 0.000 claims description 17
- 238000001704 evaporation Methods 0.000 claims description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 6
- 239000012717 electrostatic precipitator Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 4
- 239000003595 mist Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004887 air purification Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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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
- B01D53/74—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
- F23J2217/102—Intercepting solids by filters electrostatic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an SCR (selective catalytic reduction) process-based denitration device and process for external boiler flue gas, and relates to the technical field of boiler flue gas treatment, in particular to an SCR process-based denitration device for external boiler flue gas. This outer flue gas denitrification facility of boiler and technology based on SCR technology detects the temperature of flue gas through temperature sensor, then temperature sensor gives the temperature controller with signal transmission, and when the temperature was less than the setting value, temperature controller control air heating device heated the flue gas, improved the temperature of flue gas, was favorable to keeping the activity of catalyst, improved catalytic efficiency.
Description
Technical Field
The invention relates to the technical field of boiler flue gas treatment, in particular to a boiler outer flue gas denitration device based on an SCR (selective catalytic reduction) process and a process thereof.
Background
Selective Catalytic Reduction (SCR) technology is directed to NO in exhaust emissionsXThe treatment process of (1) is to inject reducing agent ammonia or urea under the action of catalyst to treat NO in the waste gasXReduction to N2And H2And O. The basic working principle of the system is as follows: a urea metering injection device is arranged on the waste gas discharge pipeline and is used for injecting urea aqueous solution, and the urea is hydrolyzed and pyrolyzed at high temperature to generate NH3Using NH on the surface of the SCR system catalyst3Reduction of NOXDischarge of N2Excess NH3Is also oxidized to N2And leakage is prevented.
At present, the SCR system at home and abroad mostly adopts high-temperature catalysts, and the reaction temperature needs higher temperature. The factor influencing the efficiency of the denitration device to the maximum is the temperature of the flue gas, when the inlet flue gas temperature of the denitration reactor is lower than a certain temperature, the activity of the catalyst is reduced, the efficiency of the flue gas denitration is influenced, and simultaneously NH (NH) is adopted3Combined together after being ejected from the injection device, NH3Insufficient mixing with the exhaust gas, only peripheral NH3Mixed reaction with the waste gas, resulting in incomplete flue gas denitration and high NH consumption3Therefore, the denitration device and the denitration process for the boiler external flue gas based on the SCR process are provided.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a boiler external flue gas denitration device based on an SCR (selective catalytic reduction) process and a process thereof, and solves the problems in the background art.
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides an outer flue gas denitrification facility of boiler based on SCR technology, includes the boiler, the right side fixedly connected with discharge flue of boiler, the inside fixed mounting of discharge flue has the filter, fixed mounting has temperature sensor on the inner wall of discharge flue, temperature sensor's right side fixedly connected with temperature controller, the bottom fixed mounting of discharge flue inner chamber has air heater, the right side fixedly connected with SCR reactor of discharge flue, the inside fixed mounting of SCR reactor has the injector head, the water conservancy diversion grid is installed on the right side of injector head, the bottom of water conservancy diversion grid is installed and is mixed the gas device, the bottom fixed mounting who mixes the gas device has fairing, catalyst storage device is installed to fairing's bottom, catalyst storage device's inside storage has the catalyst, the bottom fixedly connected with air preheater of SCR reactor, the right side fixedly connected with discharge pipe of air preheater, the right side fixedly connected with electrostatic precipitator of discharge pipe, electrostatic precipitator's right side fixedly connected with exhaust fan.
Optionally, air heating device is L shape, air heating device's inside fixed cover has cup jointed the heating pipe, temperature controller and air heating device electric connection, the outside fixed cup joint of heating pipe has the heating plate, the equidistant distribution of heating plate through setting up air heating device, utilizes the heating pipe circular telegram to produce the heat, then with heat transfer to the heating plate on, the heating plate can increase with the area of contact of air, improves the heating efficiency to the flue gas.
Optionally, there is the blending tank bottom of injector head through the pipe connection, the fixed intercommunication in bottom of blending tank has the evaporating pot, the bottom fixedly connected with ammonia pump of evaporating pot, the left side fixedly connected with ammonia storage tank of ammonia pump, the blending tank has air intake fan through the pipe connection, carries the evaporating pot with the inside aqueous ammonia of ammonia storage tank through the ammonia pump, makes the aqueous ammonia evaporate into the ammonia in the evaporating pot, then the ammonia enters into the blending tank, utilizes air intake fan to let in to the blending tank simultaneously, blows injector head department blowout with the ammonia.
Optionally, the diversion grid is located the bending part at upper and lower both ends of SCR reactor, the diversion grid inclines forty-five degrees and places, through setting up the diversion grid, utilizes the flow direction of guide flue gas, avoids the flue gas to appear the condition of backward flow in bending part, is favorable to the flow of flue gas.
Optionally, mix gas device fixed mounting in the inside of SCR reactor, mix the bottom fixedly connected with backup pad of gas device, the top activity of backup pad has cup jointed the gas fan that mixes, mixes the gas device through setting up, and the mixed gas stream promotion of ammonia and flue gas mixes the gas fan and rotates, makes flue gas and ammonia produce the disturbance by mixing the gas fan again, makes the abundant mixture of ammonia and flue gas, improves the reaction efficiency of ammonia and flue gas.
Optionally, fairing fixed mounting is in the inside of SCR reactor, the arrangement hole has been seted up to fairing's inside, the intensive equidistance in arrangement hole distributes, and through setting up fairing, the mist of flue gas and ammonia is separated into stranded strand air current by the inside arrangement hole of fairing, and strand air current can be along the vertical downward flow in arrangement hole, avoids the condition that the air current appears the sinuous flow.
The process for denitration of the flue gas outside the boiler by the device comprises the following steps:
s1, heating the flue gas, enabling the flue gas generated by the boiler to enter a discharge flue, detecting the temperature of the flue gas by using a temperature sensor, transmitting a temperature signal to a temperature controller by using the temperature sensor, and controlling an air heating device to be started by using the temperature controller to heat the flue gas when the temperature of the flue gas is lower than a set value so as to improve the temperature of the flue gas;
s2, spraying ammonia gas, conveying ammonia water in an ammonia storage tank to an evaporation tank through an ammonia pump to evaporate the ammonia water into ammonia gas, then introducing the ammonia gas into a mixing tank, blowing air into the mixing tank through an air inlet fan to dilute and mix the ammonia gas, conveying the ammonia gas to an injection head through a pipeline to be sprayed out, and adding the ammonia gas into flue gas;
s3, mixing ammonia gas, enabling ammonia gas and flue gas to flow into a gas mixing device through a flow guide grid, pushing a gas mixing fan to rotate by utilizing the flow of the flue gas, enabling the flue gas and the ammonia gas to be disturbed and mixed together through the rotation of the gas mixing fan, and rectifying the flue gas into a plurality of streams of vertically downward flowing air flow through a rectifying device, so that the air flow is not disturbed any more;
s4, catalyzing reaction, namely allowing the mixed gas of ammonia gas and flue gas to downwards pass through a catalyst storage device, catalyzing the flue gas to react with the ammonia gas by using a catalyst, and reacting NO in the waste gasXReduction to N2And H2O；
S5, dedusting and filtering, wherein the denitrated flue gas enters an electric dust remover, dust particles contained in the flue gas are removed by the electric dust remover, the flue gas is purified to a dischargeable standard, and finally an exhaust fan discharges the flue gas.
The invention provides a boiler external flue gas denitration device based on an SCR (selective catalytic reduction) process and a process thereof, which have the following beneficial effects:
1. this outer flue gas denitrification facility of boiler and technology based on SCR technology detects the temperature of flue gas through temperature sensor, then temperature sensor gives the temperature controller with signal transmission, and when the temperature was less than the setting value, temperature controller control air heating device heated the flue gas, improved the temperature of flue gas, was favorable to keeping the activity of catalyst, improved catalytic efficiency.
2. This outer flue gas denitrification facility of boiler and technology based on SCR technology, the mist fan that promotes through the mixed gas flow of ammonia and flue gas rotates, make flue gas and ammonia produce the disturbance by the mist fan again, make the abundant mixture of ammonia and flue gas, improve the reaction efficiency of ammonia and flue gas, through setting up fairing, the mixed gas of flue gas and ammonia is separated into stranded strand air current by the inside arrangement hole of fairing, strand air current can be along the vertical downstream in arrangement hole, avoid the condition that the air current appears the sinuous flow.
3. The denitration device and the denitration process of the boiler outer flue gas based on the SCR process are catalyzed by a catalystNO in flue gasXReacting with ammonia gas to remove NO in the flue gasXReduction to N2And H2And O, realizing the denitration treatment of the flue gas, removing dust particles in the flue gas by using an electric dust remover in the process that the flue gas enters the electric dust remover, and purifying the flue gas.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a half section of the present invention;
FIG. 3 is a schematic structural view of an air heating apparatus according to the present invention;
FIG. 4 is a schematic structural view of the gas mixing device of the present invention;
FIG. 5 is a schematic view of a rectifying device according to the present invention.
In the figure: 1. a boiler; 2. a discharge flue; 3. a filter; 4. a temperature sensor; 5. a temperature controller; 6. an air heating device; 61. heating a tube; 62. a heating plate; 7. an SCR reactor; 8. an injector head; 9. a mixing tank; 10. an evaporator tank; 11. an ammonia pump; 12. an ammonia storage tank; 13. an air intake fan; 14. a flow-guiding grille; 15. a gas mixing device; 151. a support plate; 152. a gas mixing fan; 16. a rectifying device; 161. arranging holes; 17. a catalyst storage device; 18. an air preheater; 19. a discharge pipe; 20. an electric dust collector; 21. an exhaust fan.
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 to 3, the present invention provides a technical solution: a denitration device of boiler external flue gas based on SCR technology comprises a boiler 1, a discharge flue 2 is fixedly connected to the right side of the boiler 1, a filter 3 is fixedly installed inside the discharge flue 2, a temperature sensor 4 is fixedly installed on the inner wall of the discharge flue 2, the temperature of the flue gas is detected by the temperature sensor 4 through the temperature sensor 4, the temperature of the flue gas flowing out can be conveniently and accurately mastered, a temperature controller 5 is fixedly connected to the right side of the temperature sensor 4, the temperature controller 5 is arranged to control the air heating device 6 to be turned on or off, when the temperature of the flue gas is low, the air heating device 6 is automatically controlled by the temperature controller 5 to be turned on without manual operation, an air heating device 6 is fixedly installed at the bottom of an inner cavity of the discharge flue 2, the air heating device 6 is L-shaped, and a heating pipe 61 is fixedly sleeved inside the air heating device 6, temperature controller 5 and 6 electric connection of air heating device, the fixed cover in outside of heating pipe 61 has connect heating plate 62, and equidistant distribution of heating plate 62 through setting up air heating device 6, utilizes heating pipe 61 circular telegram to produce the heat, then with heat transfer to heating plate 62 on, heating plate 62 can increase the area of contact with the air, improves the heating efficiency to the flue gas.
Please refer to fig. 1 to 2, the right side of the discharge flue 2 is fixedly connected with an SCR reactor 7, the inside fixed mounting of the SCR reactor 7 has an injector head 8, through setting up the injector head 8, utilize the injector head 8 to spout ammonia, make things convenient for the mixing of ammonia and flue gas, the bottom of the injector head 8 has a blending tank 9 through the pipe connection, the bottom fixed intercommunication of the blending tank 9 has an evaporating pot 10, the bottom fixed connection of the evaporating pot 10 has an ammonia pump 11, carry the inside aqueous ammonia of the ammonia storage tank 12 to the evaporating pot 10 through the ammonia pump 11, make the aqueous ammonia evaporate into ammonia in the evaporating pot 10, the left side fixed connection of the ammonia pump 11 has an ammonia storage tank 12, the blending tank 9 has an air intake fan 13 through the pipe connection, let in air into the blending tank 9 through the air intake fan 13, when the ammonia enters into the blending tank 9, mix ammonia and air, can reduce the concentration of ammonia.
Referring to fig. 2 and 4, a flow guide grid 14 is installed on the right side of the injector head 8, the flow guide grid 14 is located at a bending position at the upper end and the lower end of the SCR reactor 7, the flow guide grid 14 is placed in an inclined forty-five degree angle, the flow direction of the flue gas is guided by the flow guide grid 14, the flue gas backflow at the bending position is avoided, and the flow of the flue gas is facilitated, a gas mixing device 15 is installed at the bottom of the flow guide grid 14, the gas mixing device 15 is fixedly installed inside the SCR reactor 7, a support plate 151 is fixedly connected to the bottom of the gas mixing device 15, a gas mixing fan 152 is movably sleeved at the top of the support plate 151, the mixed gas flow of the ammonia and the flue gas pushes the gas mixing fan 152 to rotate by the arrangement of the gas mixing device 15, and then the flue gas and the ammonia gas are disturbed by the gas mixing fan 152, so that the ammonia and the flue gas are sufficiently mixed, and the reaction efficiency of the ammonia and the flue gas is improved.
Referring to fig. 2 and 5, a rectifying device 16 is fixedly installed at the bottom of the gas mixing device 15, the rectifying device 16 is fixedly installed inside the SCR reactor 7, arranging holes 161 are formed in the rectifying device 16, the arranging holes 161 are distributed densely and equidistantly, by arranging the rectifying device 16, the mixed gas of the flue gas and the ammonia gas is divided into a plurality of small streams by the arranging holes 161 in the rectifying device 16, and the small streams flow vertically and downwards along the arranging holes 161, so that the condition of turbulent flow of the gas stream is avoided.
Referring to fig. 2, a catalyst storage device 17 is installed at the bottom of the rectifying device 16, a catalyst is stored in the catalyst storage device 17, the catalyst is used for catalyzing the reaction of the flue gas and ammonia gas by the catalyst, so as to reduce NOX in the exhaust gas into N2 and H2O, an air preheater 18 is fixedly connected to the bottom of the SCR reactor 7, a discharge pipe 19 is fixedly connected to the right side of the air preheater 18, an electric dust remover 20 is fixedly connected to the right side of the discharge pipe 19, dust contained in the flue gas is removed by the electric dust remover 20, so that air purification is facilitated, and an exhaust fan 21 is fixedly connected to the right side of the electric dust remover 20.
The process for denitration of the flue gas outside the boiler by using the device comprises the following steps:
s1, heating the flue gas, enabling the flue gas generated by the boiler 1 to enter a flue 2, detecting the temperature of the flue gas by using a temperature sensor 4, transmitting a temperature signal to a temperature controller 5 by using the temperature sensor 4, and controlling an air heating device 6 to start to heat the flue gas by using the temperature controller 5 when the temperature of the flue gas is lower than a set value so as to improve the temperature of the flue gas;
s2, spraying ammonia gas, conveying ammonia water in an ammonia storage tank 12 to an evaporation tank 10 through an ammonia pump 11 to evaporate the ammonia water into ammonia gas, then introducing the ammonia gas into a mixing tank 9, blowing air into the mixing tank 9 through an air inlet fan 13 to dilute and mix the ammonia gas, then conveying the ammonia gas to an injection head 8 through a pipeline to be sprayed out, and adding the ammonia gas into flue gas;
s3, mixing ammonia gas, enabling ammonia gas and flue gas to flow into the gas mixing device 15 through the flow guide grid 14, pushing the gas mixing fan 152 to rotate by using the flow of the flue gas, enabling the flue gas and the ammonia gas to be disturbed and mixed together through the rotation of the gas mixing fan 152, and rectifying the flue gas into a plurality of air flows flowing vertically downwards through the rectifying device 16, so that the air flows are not disturbed any more;
s4, catalyzing reaction, namely allowing the mixed gas of ammonia gas and flue gas to downwards pass through the catalyst storage device 17, catalyzing the flue gas to react with the ammonia gas by using the catalyst, and reacting NO in the waste gasXReduction to N2And H2O；
S5, dedusting and filtering, wherein the denitrated flue gas enters the electric dust collector 20, dust particles contained in the flue gas are removed by the electric dust collector 20, the flue gas is purified to reach the dischargeable standard, and finally the flue gas is discharged by the exhaust fan 21.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The utility model provides an outer flue gas denitrification facility of boiler based on SCR technology, includes boiler (1), its characterized in that: the utility model discloses a boiler, including boiler (1), right side fixedly connected with discharge flue (2), the inside fixed mounting of discharge flue (2) has filter (3), fixed mounting has temperature sensor (4) on the inner wall of discharge flue (2), the right side fixedly connected with temperature controller (5) of temperature sensor (4), the bottom fixed mounting of discharge flue (2) inner chamber has air heating device (6), the right side fixedly connected with SCR reactor (7) of discharge flue (2), the inside fixed mounting of SCR reactor (7) has injector head (8), water conservancy diversion grid (14) are installed on the right side of injector head (8), gas mixing device (15) is installed to the bottom of water conservancy diversion grid (14), the bottom fixed mounting of gas mixing device (15) has fairing (16), catalyst storage device (17) is installed to the bottom of fairing (16), the inside storage of catalyst storage device (17) has the catalyst, the bottom fixedly connected with air preheater (18) of SCR reactor (7), the right side fixedly connected with discharge pipe (19) of air preheater (18), the right side fixedly connected with electrostatic precipitator (20) of discharge pipe (19), the right side fixedly connected with exhaust fan (21) of electrostatic precipitator (20).
2. The SCR technology-based denitration device for boiler external flue gas, according to claim 1, is characterized in that: air heating device (6) are L shape, heating pipe (61) have been cup jointed to the inside of air heating device (6) is fixed, temperature controller (5) and air heating device (6) electric connection, heating plate (62) have been cup jointed to the external fixation of heating pipe (61), heating plate (62) equidistant distribution.
3. The SCR technology-based denitration device for boiler external flue gas, according to claim 1, is characterized in that: the bottom of injection head (8) has blending tank (9) through the pipe connection, the fixed intercommunication in bottom of blending tank (9) has evaporating pot (10), the bottom fixedly connected with ammonia pump (11) of evaporating pot (10), the left side fixed connection of ammonia pump (11) has ammonia storage tank (12), blending tank (9) have air intake fan (13) through the pipe connection.
4. The SCR technology-based denitration device for boiler external flue gas, according to claim 1, is characterized in that: the flow guide grids (14) are located at the bent positions of the upper end and the lower end of the SCR reactor (7), and the flow guide grids (14) are placed in a manner of inclining at a forty-five-degree angle.
5. The SCR technology-based denitration device for boiler external flue gas, according to claim 1, is characterized in that: mix gas device (15) fixed mounting in the inside of SCR reactor (7), the bottom fixedly connected with backup pad (151) of mixing gas device (15), the top activity of backup pad (151) is cup jointed and is mixed gas fan (152).
6. The SCR technology-based denitration device for boiler external flue gas, according to claim 1, is characterized in that: fairing (16) fixed mounting is in the inside of SCR reactor (7), arrangement hole (161) have been seted up to fairing (16) inside, the intensive equidistance distribution of arrangement hole (161).
7. The process for denitration of flue gas outside a boiler by using the device according to any one of claims 1 to 6, wherein: the method comprises the following steps:
s1, heating flue gas, enabling the flue gas generated by the boiler (1) to enter a discharge flue (2), detecting the temperature of the flue gas by using a temperature sensor (4), then transmitting a temperature signal to a temperature controller (5) by using the temperature sensor (4), and controlling an air heating device (6) to be started to heat the flue gas by using the temperature controller (5) when the temperature of the flue gas is lower than a set value, so as to improve the temperature of the flue gas;
s2, spraying ammonia gas, conveying ammonia water in an ammonia storage tank (12) to an evaporation tank (10) through an ammonia pump (11) to evaporate the ammonia water into ammonia gas, then introducing the ammonia gas into a mixing tank (9), blowing air into the mixing tank (9) through an air inlet fan (13) to dilute and mix the ammonia gas, then conveying the ammonia gas to an injection head (8) through a pipeline to be sprayed out, and adding the ammonia gas into flue gas;
s3, mixing ammonia gas, enabling ammonia gas and flue gas to flow into a gas mixing device (15) through a flow guide grid (14), pushing a gas mixing fan (152) to rotate by utilizing the flow of the flue gas, enabling the flue gas and the ammonia gas to be disturbed and mixed together through the rotation of the gas mixing fan (152), and rectifying the flue gas into a plurality of air flows flowing vertically downwards through a rectifying device (16) to enable the air flows not to be disturbed any more;
s4, catalyzing reaction, namely allowing the mixed gas of ammonia gas and flue gas to downwards pass through a catalyst, catalyzing the flue gas to react with the ammonia gas by using the catalyst, and reacting NO in the waste gasXReduction to N2And H2O；
S5, dedusting and filtering, wherein the denitrated flue gas enters an electric dust collector (20), dust particles contained in the flue gas are removed by the electric dust collector (20), the flue gas is purified to be in a dischargeable standard, and finally, the flue gas is discharged by an exhaust fan (21).
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| CN202210195491.4A CN114558448A (en) | 2022-03-01 | 2022-03-01 | SCR (Selective catalytic reduction) process-based boiler external flue gas denitration device and process thereof |
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| CN103055696A (en) * | 2012-12-27 | 2013-04-24 | 浙江信耳科技有限公司 | A SCR flue gas denitrification system having a pre-positioned dual fluid injection system |
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