CN219765000U - NOx-containing flue gas microwave catalytic NH3 reduction device and system - Google Patents
NOx-containing flue gas microwave catalytic NH3 reduction device and system Download PDFInfo
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- CN219765000U CN219765000U CN202321373420.5U CN202321373420U CN219765000U CN 219765000 U CN219765000 U CN 219765000U CN 202321373420 U CN202321373420 U CN 202321373420U CN 219765000 U CN219765000 U CN 219765000U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000003546 flue gas Substances 0.000 title claims abstract description 68
- 230000009467 reduction Effects 0.000 title claims abstract description 22
- 230000003197 catalytic effect Effects 0.000 title claims description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 185
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims abstract description 49
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 40
- 239000003054 catalyst Substances 0.000 claims abstract description 33
- 238000005507 spraying Methods 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims description 31
- 238000011084 recovery Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 238000006722 reduction reaction Methods 0.000 abstract description 14
- 230000009471 action Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 5
- 238000006555 catalytic reaction Methods 0.000 abstract description 3
- 239000007795 chemical reaction product Substances 0.000 abstract description 3
- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- 230000023556 desulfurization Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- 239000007789 gas Substances 0.000 description 12
- 239000003638 chemical reducing agent Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model provides a device and a system for carrying out microwave catalysis on NH3 reduction on NOx-containing flue gas, and relates to the field of desulfurization and denitrification. The device utilizes the characteristic that the microwave ultraviolet catalytic reduction reaction can run at low temperature, and the NOx in low-temperature flue gas and NH3 are subjected to high-efficiency rapid reduction reaction at 50-60 ℃ under the action of microwaves, ultraviolet and a catalyst, and the reaction product is N2. Under the action of the controller, the spraying amount of NH3 and microwave power can be adaptively adjusted according to the concentration of NOx in the flue gas, so that ammonia escape and electric energy waste are prevented, and the method can be widely applied to the field of industrial flue gas treatment.
Description
Technical Field
The utility model relates to the field of desulfurization and denitrification, in particular to a device and a system for microwave catalytic NH3 reduction of NOx-containing flue gas.
Background
The most popular denitration treatment system at present generally adopts an SNCR+SCR combined technology, and SNCR selective non-catalytic reduction refers to that under the action of no catalyst, a reducing agent is sprayed into a temperature window suitable for denitration reaction to reduce nitrogen oxides in flue gas into harmless nitrogen and water. This technology typically employs in-furnace ammonia injection, urea or hydrogen ammonia as a reductant to reduce NOx. The SCR denitration technology, i.e., a selective catalyst reduction method, is to inject ammonia gas or other suitable reducing agent into the flue gas upstream of the catalyst, and convert NOX in the flue gas into nitrogen gas and water by using the catalyst. The reducing agent reacts only with NOx in the flue gas and generally does not react with oxygen, and the technology does not use a catalyst, so this method is called selective non-catalytic reduction (SNCR). Since the process does not use a catalyst, a reducing agent must be added in the high temperature zone. The reducing agent is sprayed into the area with the temperature of 850-1100 ℃ of the hearth, is quickly thermally decomposed into NH3 and reacts with NOx in the flue gas to generate N2 and water. The traditional denitration treatment equipment mainly has the problems of complex system structure, large volume, high operation cost, catalyst replacement and treatment, incapability of recycling low-temperature waste heat and the like.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art in the denitration process, and improve a device and a system for microwave catalytic NH3 reduction of NOx-containing flue gas, so as to solve the problems of complex equipment structure, high investment cost and difficult recovery of waste heat in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the embodiment of the utility model is as follows:
the utility model provides a device and a system for microwave catalytic NH3 reduction of NOx-containing flue gas, wherein the device comprises: the device comprises a high-temperature flue gas outlet, an ammonia spraying grid, a heat energy recovery device, a MW-LEP reaction cavity, a chimney and a control system;
the high-temperature flue gas outlet is connected with the exhaust port of the combustion furnace, the ammonia injection grid is arranged on a high-temperature flue of the combustion chamber outlet, the inlet of the heat energy recovery device is connected with a high-temperature flue gas pipeline of the ammonia injection grid, the outlet of the heat energy recovery device is connected with the MW-LEP reaction cavity, and the inlet of the chimney is connected with a pipeline of the MW-LEP reaction cavity outlet.
Optionally, the ammonia spraying grid comprises an ammonia spraying pipeline, a supporting accessory and an ammonia gas distribution device. Optionally, the MW-LEP reaction chamber includes: the device comprises an air inlet, a metal cavity, a microwave source, an electrodeless ultraviolet lamp tube, an air outlet and a catalyst.
Optionally, the electrodeless ultraviolet lamp tube is a 254nm ultraviolet lamp tube, and the lamp tube is fixed in the reaction cavity through a lamp tube bracket, and the length direction of the lamp tube is perpendicular to the air flow direction.
Optionally, the catalyst is supported on a carrier to form a catalyst net, and the catalyst net is fixed in the microwave ultraviolet reaction cavity through a bracket, and the direction of the catalyst net is parallel to the direction of the air flow.
Optionally, the microwave sources are distributed on the outer surface of the microwave ultraviolet reaction cavity at intervals.
Optionally, the carrier is a mesh material which does not absorb microwaves, and can be one of a glass fiber mesh and a silica gel mesh.
Optionally, the control system comprises 1 air volume sensor, 2 NOx concentration sensors, 1 NH3 concentration sensor, 1 controller and 2 actuators.
Optionally, the air volume sensor is arranged at the inlet of the chimney and is used for measuring the air volume of the system, one of the NOx concentration sensors is arranged at the outlet of the high-temperature flue gas and is used for measuring the NOx concentration in the high-temperature flue gas, the other NOx concentration sensor is arranged at the inlet end of the chimney and is used for measuring the NOx concentration in the flue gas after the system is used for processing, and the NH3 concentration sensor is arranged at the inlet end of the flue gas and is used for measuring the NOx concentration in the flue gas after the system is used for processing.
Optionally, the control system may, according to the air volume and the information of the concentration of NOx before treatment, determine, according to a molar ratio NH3: NH3 is injected into the furnace according to the proportion of NOx= (0.8-1) to (1.3-2); and adjusts the system power.
The utility model has the beneficial effects that: the utility model provides a device and a system for microwave catalytic NH3 reduction of NOx-containing flue gas, which are characterized in that: the device comprises: the device comprises a high-temperature flue gas outlet, an ammonia spraying grid, a heat energy recovery device, a MW-LEP reaction cavity, a chimney and a control system; the high-temperature flue gas outlet is connected with the exhaust port of the combustion furnace, the ammonia injection grid is arranged on a high-temperature flue of the combustion chamber outlet, the inlet of the heat energy recovery device is connected with a high-temperature flue gas pipeline of the ammonia injection grid, the outlet of the heat energy recovery device is connected with the MW-LEP reaction cavity, and the inlet of the chimney is connected with a pipeline of the MW-LEP reaction cavity outlet. The device utilizes the characteristic that the microwave ultraviolet catalytic reduction reaction can run at low temperature, and the NOx in low-temperature flue gas and NH3 are subjected to efficient and rapid reduction reaction at 50-60 ℃ under the action of microwaves, ultraviolet and a catalyst, and the reaction product is N2. Under the action of the controller, the spraying amount of NH3 and microwave power can be adaptively adjusted according to the concentration of NOx in the flue gas, so that ammonia escape and electric energy waste are prevented, and the method can be widely applied to the field of denitration.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an apparatus for microwave catalytic NH3 reduction of NOx-containing flue gas according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a microwave ultraviolet reaction chamber according to an embodiment of the present utility model: 1-microwave source, 2-air inlet, 3-air outlet, 4-electrodeless ultraviolet lamp, 5-lamp bracket and 6-catalyst net.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. Based on the embodiments of the present utility model, all other embodiments that can be obtained by a person skilled in the art without making any inventive effort fall within the scope of protection of the present utility model: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
FIG. 1 is a flow chart of an apparatus for microwave catalytic NH3 reduction of NOx-containing flue gas according to an embodiment of the present utility model; FIG. 2 is a schematic diagram of a microwave ultraviolet reaction chamber in an embodiment of the utility model; embodiments of the present utility model are described below with reference to fig. 1 and 2.
The utility model provides a device and a system for microwave catalytic NH3 reduction of NOx-containing flue gas, which are characterized in that: the device comprises: the device comprises a high-temperature flue gas outlet, an ammonia spraying grid, a heat energy recovery device, a MW-LEP reaction cavity, a chimney and a control system;
the high-temperature flue gas outlet is connected with the exhaust port of the combustion furnace, the ammonia injection grid is arranged on a high-temperature flue of the combustion chamber outlet, the inlet of the heat energy recovery device is connected with a high-temperature flue gas pipeline of the ammonia injection grid, the outlet of the heat energy recovery device is connected with the MW-LEP reaction cavity, and the inlet of the chimney is connected with a pipeline of the MW-LEP reaction cavity outlet.
Specifically, the ammonia spraying grid comprises an ammonia spraying pipeline, a supporting accessory and an ammonia gas distribution device.
In the production process of enterprises such as electric power, cement, coking and the like, a large amount of exhaust gas is generated, and a large amount of nitrogen oxides are contained in the exhaust gas, so that in order to prevent the air from being polluted by the nitrogen oxides, the nitrogen oxides need to be removed from the exhaust gas and then the exhaust gas is discharged. The uniformity of mixing of ammonia gas or ammonia-containing air and flue gas directly determines the NO and ammonia escape concentration distribution at the outlet of the denitration reactor, and influences the overall denitration efficiency and NH4HSO4 blockage of downstream equipment. The ammonia spraying grids adopted by the denitration system are mostly grid-type, a large number of ammonia pipes are crossed and extend into the flue, and a plurality of small nozzles (100-1000 nozzles are unequal) are arranged on each pipe.
The ammonia spraying grille adopts liquid ammonia or ammonia water as a reducing agent, the liquid ammonia or ammonia water is mixed with air and sprayed into a high-temperature flue gas pipeline, and further reacts with nitrogen oxides in waste gas under the action of a catalyst through the combined action of a heat energy recovery device and microwave ultraviolet to generate harmless nitrogen and water, so that nitrogen oxides are removed from the waste gas.
Further, the MW-LEP reaction chamber includes: the device comprises an air inlet, a metal cavity, a microwave source, an electrodeless ultraviolet lamp tube, an air outlet and a catalyst.
Furthermore, the electrodeless ultraviolet lamp tube is a 254nm ultraviolet lamp tube, and the lamp tube is fixed in the reaction cavity through a lamp tube bracket, and the length direction of the lamp tube is perpendicular to the air flow direction.
Further, the catalyst is loaded on the carrier to form a catalyst net, and the catalyst net is fixed in the microwave ultraviolet reaction cavity through the bracket, and the direction of the catalyst net is parallel to the direction of the air flow.
Further, the microwave sources are distributed on the outer surface of the outer reaction cavity at intervals. Further, the carrier is a mesh material which does not absorb microwaves, and can be selected from one of a glass fiber mesh and a silica gel mesh.
It should be noted that, in the embodiment of the present utility model, the catalyst is made of metal oxide, and in particular, one or more of v2o5, WO3, MNOx, moO3, and Tio2 may be selected, the catalyst is supported on a carrier by an impregnation manner to form a catalyst mesh, the carrier is a mesh material that does not absorb microwaves, and may be a glass fiber mesh, a silica gel mesh, or the like, the catalyst mesh is fixed in a microwave ultraviolet reaction cavity by a bracket, and the plane of the catalyst mesh hinders which is parallel to the airflow direction, so that wind resistance may be reduced, an electrodeless ultraviolet lamp tube uniformly and vertically forms a plurality of catalyst meshes, and the radiation range of microwaves is enhanced once.
Further, the control system comprises 1 air volume sensor, 2 NOx concentration sensors, 1 NH3 concentration sensor, 1 controller and 2 actuators.
Specifically, the air volume sensor is arranged at the inlet of the chimney and is used for measuring the air volume of the system, one of the NOx concentration sensors is arranged at the outlet of the high-temperature flue gas and is used for measuring the NOx concentration in the high-temperature flue gas, the other NOx concentration sensor is arranged at the inlet end of the chimney and is used for measuring the NOx concentration in the flue gas after the system is used for processing, and the NH3 concentration sensor is arranged at the inlet end of the flue gas and is used for measuring the NOx concentration in the flue gas after the system is used for processing.
Further, the control system can control the air quantity and the concentration information of the NOx before treatment according to the mole ratio NH3: NH3 is injected into the furnace according to the proportion of NOx= (0.8-1) to (1.3-2); and adjusts the system power.
It should be noted that, in the embodiment of the present utility model, the controller is used for supplying power to the sensor and the actuator; and collecting sensor data, specifically collecting the concentration of NOx before and after the air quantity treatment of the system and the concentration of NH3 after the treatment, performing data treatment, and sending an instruction to an actuator. Specifically, according to the air quantity and the NO degree information before treatment, the method comprises the following steps of: NOx= (0.8-1): (1.3-2) NH3 is injected and the power is regulated, the regulation process comprising the following cases:
(1) When the ammonia concentration in the tail gas measured by the NH3 concentration sensor is smaller than or equal to the emission standard, and the ammonia spraying proportion is smaller than NH3: nox=0.8:2, and the content of NOx in the tail gas reaches the standard, so that the microwave power is reduced;
(2) When the ammonia concentration in the tail gas measured by the NH3 concentration sensor is greater than the emission standard, and the ammonia injection proportion is greater than NH3: nox=1:1.3, and the content of NOx in the tail gas reaches the standard, so that the spray amount is reduced;
(3) When the ammonia concentration in the tail gas measured by the NH3 concentration sensor is greater than the emission standard, and the ammonia spraying proportion is less than or equal to NH3: when NOx=0.8:2, and the content of NOx in the tail gas reaches the standard, the microwave power is improved;
(4) When the ammonia concentration in the tail gas measured by the NH3 concentration sensor is smaller than or equal to the emission standard, and the ammonia spraying proportion is smaller than or equal to NH3: nox=0.8:1.7, and the NOx content in the exhaust gas exceeds the standard, so that the spray amount is increased.
That is, in the denitration process, through the mutual coordination of the ammonia spraying grille, the heat energy recovery and the microwave ultraviolet catalysis, the device can realize the full recovery of the heat energy in the high-temperature flue gas, SO that the outlet temperature of the high-temperature flue gas is more than or equal to 50 ℃, the recovered heat energy can be used for supplying heat, preheating, producing water vapor, generating power and the like, and simultaneously, the device can realize low-cost deamination under the action of the microwave ultraviolet catalysis.
The embodiment of the utility model provides a device and a system for microwave catalytic NH3 reduction of NOx-containing flue gas, which are characterized in that: the device comprises: the device comprises a high-temperature flue gas outlet, an ammonia spraying grid, a heat energy recovery device, a MW-LEP reaction cavity, a chimney and a control system; the high-temperature flue gas outlet is connected with the exhaust port of the combustion furnace, the ammonia injection grid is arranged on a high-temperature flue of the combustion chamber outlet, the inlet of the heat energy recovery device is connected with a high-temperature flue gas pipeline of the ammonia injection grid, the outlet of the heat energy recovery device is connected with the MW-LEP reaction cavity, and the inlet of the chimney is connected with a pipeline of the MW-LEP reaction cavity outlet. That is, the device of the utility model utilizes the characteristic that the microwave ultraviolet catalytic reduction reaction can run at low temperature, and the NOx in the low-temperature flue gas and NH3 are subjected to high-efficiency rapid reduction reaction at 50-60 ℃ under the action of microwaves, ultraviolet and catalysts, and the reaction product is N2. Under the action of the controller, the spraying amount of NH3 and microwave power can be adaptively adjusted according to the concentration of NOx in the flue gas, so that ammonia escape and electric energy waste are prevented. The device has the advantages of small investment, small equipment volume, high treatment efficiency and low operation cost, and can recycle about 300 ℃ more flue gas heat than the prior desulfurization and denitrification system under the condition of only using one set of preheating recovery equipment, thereby having obvious economic benefit and being widely applied to the field of denitrification.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. A device and a system for microwave catalytic NH3 reduction of NOx-containing flue gas are characterized in that: the device comprises: the device comprises a high-temperature flue gas outlet, an ammonia spraying grid, a heat energy recovery device, a MW-LEP reaction cavity, a chimney and a control system;
the high-temperature flue gas outlet is connected with the exhaust port of the combustion furnace, the ammonia injection grid is arranged on a high-temperature flue of the combustion chamber outlet, the inlet of the heat energy recovery device is connected with a high-temperature flue gas pipeline of the ammonia injection grid, the outlet of the heat energy recovery device is connected with the MW-LEP reaction cavity, and the inlet of the chimney is connected with a pipeline of the MW-LEP reaction cavity outlet.
2. The device and system for microwave catalytic NH3 reduction of NOx-containing flue gas of claim 1, wherein: the ammonia spraying grille comprises an ammonia spraying pipeline, a supporting fitting and an ammonia gas distribution device.
3. The device and system for microwave catalytic NH3 reduction of NOx-containing flue gas of claim 1, wherein: the MW-LEP reaction chamber comprises: the device comprises an air inlet, a metal cavity, a microwave source, an electrodeless ultraviolet lamp tube, an air outlet and a catalyst.
4. A NOx-containing flue gas microwave catalytic NH3 reduction apparatus and system according to claim 3, wherein: the electrodeless ultraviolet lamp tube is a 254nm ultraviolet lamp tube, and is fixed in the reaction cavity through a lamp tube bracket, and the length direction of the electrodeless ultraviolet lamp tube is perpendicular to the air flow direction.
5. A NOx-containing flue gas microwave catalytic NH3 reduction apparatus and system according to claim 3, wherein: the catalyst is loaded on the carrier to form a catalyst net, and the catalyst net is fixed in the microwave ultraviolet reaction cavity through the bracket, and the direction of the catalyst net is parallel to the direction of the air flow.
6. A NOx-containing flue gas microwave catalytic NH3 reduction apparatus and system according to claim 3, wherein: the microwave sources are distributed on the outer surface of the microwave external reaction cavity at intervals.
7. The device and system for microwave catalytic NH3 reduction of NOx containing flue gas of claim 5, wherein: the carrier is a mesh material which does not absorb microwaves, and can be selected from one of a glass fiber mesh and a silica gel mesh.
8. The device and system for microwave catalytic NH3 reduction of NOx-containing flue gas of claim 1, wherein: the control system comprises 1 air quantity sensor, 2 NOx concentration sensors, 1 NH3 concentration sensor, 1 controller and 2 actuators.
9. The device and system for microwave catalytic NH3 reduction of NOx containing flue gas of claim 8, wherein: the air quantity sensor is arranged at the inlet of the chimney and used for measuring the air quantity of the system, one of the NOx concentration sensors is arranged at the outlet of the high-temperature flue gas and used for measuring the NOx concentration in the high-temperature flue gas, the other NOx concentration sensor is arranged at the inlet end of the chimney and used for measuring the NOx concentration in the flue gas after the system is used for processing, and the NH3 concentration sensor is arranged at the inlet end of the flue gas and used for measuring the NOx concentration in the flue gas after the system is used for processing.
10. The device and system for microwave catalytic NH3 reduction of NOx-containing flue gas of claim 1, wherein: the control system can control the air quantity and the concentration information of the NOx before treatment according to the mole ratio NH3:
NH3 is injected into the furnace according to the proportion of NOx= (0.8-1) to (1.3-2); and adjusts the system power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321373420.5U CN219765000U (en) | 2023-06-01 | 2023-06-01 | NOx-containing flue gas microwave catalytic NH3 reduction device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321373420.5U CN219765000U (en) | 2023-06-01 | 2023-06-01 | NOx-containing flue gas microwave catalytic NH3 reduction device and system |
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| Publication Number | Publication Date |
|---|---|
| CN219765000U true CN219765000U (en) | 2023-09-29 |
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| CN202321373420.5U Active CN219765000U (en) | 2023-06-01 | 2023-06-01 | NOx-containing flue gas microwave catalytic NH3 reduction device and system |
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| Country | Link |
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| CN (1) | CN219765000U (en) |
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2023
- 2023-06-01 CN CN202321373420.5U patent/CN219765000U/en active Active
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