CN210845565U - SCR denitration dust collector - Google Patents
SCR denitration dust collector Download PDFInfo
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- CN210845565U CN210845565U CN201921723839.2U CN201921723839U CN210845565U CN 210845565 U CN210845565 U CN 210845565U CN 201921723839 U CN201921723839 U CN 201921723839U CN 210845565 U CN210845565 U CN 210845565U
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- Prior art keywords
- scr denitration
- denitration reactor
- catalyst
- reactor
- dust
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- 239000000428 dust Substances 0.000 title claims abstract description 54
- 239000003054 catalyst Substances 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 230000005674 electromagnetic induction Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 17
- 239000003546 flue gas Substances 0.000 abstract description 17
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 238000006555 catalytic reaction Methods 0.000 abstract description 7
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 230000036632 reaction speed Effects 0.000 abstract description 4
- 238000007086 side reaction Methods 0.000 abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model relates to a SCR denitration dust removal device, which belongs to the technical field of flue gas dust removal, comprising an SCR denitration reactor for denitration treatment, an inlet flue arranged between an economizer and the SCR denitration reactor and an outlet flue arranged between the SCR denitration reactor and an air preheater, guide vanes, a rectifying grid and a catalyst are sequentially arranged in the SCR denitration reactor from top to bottom, an ash removal device is arranged on a catalyst layer, the ash removal device comprises an air compressor arranged outside the SCR denitration reactor, a branch pipe arranged on the catalyst layer and a header pipe communicated with the branch pipe and the air compressor, the outer wall of the header pipe is provided with a heating device, one end of the header pipe connected with the branch pipe is provided with a temperature controller, the heating device heats compressed air entering the SCR denitration reactor, cold compressed air is prevented from entering the SCR denitration reactor, the temperature of the SCR denitration reactor is too low, and the catalytic reaction speed is slow, even side reactions are generated which are not conducive to NOx degradation, thereby affecting the denitrification reaction.
Description
Technical Field
The utility model relates to a flue gas dust removal technical field, more specifically say, it relates to a SCR denitration dust collector.
Background
SCR denitration is a selective catalytic reduction flue gas denitration process, the SCR denitration technology is flue gas which currently occupies the mainstream, and the technical principle is that a denitration reducing agent is sprayed into a denitration reactor with the temperature of 280-420 ℃, NOx in the flue gas is reduced into harmless N2 and H2O under the action of a catalyst, and the aim of removing the NOx is achieved. Because the arrangement mode is usually arranged between the economizer and the air preheater of the boiler system, the ash content in the flue gas is higher, the arrangement mode belongs to a high-dust arrangement mode, and the influence on the activity of the catalyst is very large.
In order to solve the above technical problem, a device for removing the dust on the surface of the catalyst appears in the prior art, for example, the chinese utility model patent with the publication number of CN205914019U proposes a novel SCR denitration device. Including SCR denitration reactor and soot blower, soot blower is including setting up the air compressor outside at SCR denitration reactor, house steward and the setting of air compressor intercommunication at SCR denitration catalyst layer and ammonia desorption catalyst layer upper portion and house steward's main pipe of intercommunication, set up a plurality of branch pipes that communicate with the main pipe perpendicularly on the main pipe, the branch pipe bottom sets up a plurality of exhaust holes, compressed air gets into the main pipe in the SCR denitration reactor through the house steward, blow off through the branch pipe and remove dust with the catalyst layer.
The above prior art solutions have the following drawbacks: compressed air discharged by an air compressor directly enters the SCR denitration reactor through a compressor main pipe, and the temperature of the compressed air entering the SCR denitration reactor is low, so that the temperature of SCR denitration reaction needs to be controlled between 280 ℃ and 420 ℃, and the reaction of NOx in flue gas and a reducing agent is insufficient.
SUMMERY OF THE UTILITY MODEL
Get into the low problem of compressed air temperature in the SCR denitration reactor among the prior art, the utility model provides an SCR denitration dust collector, concrete scheme is as follows:
the utility model provides a SCR denitration dust collector, is including the SCR denitration reactor that carries out denitration treatment, set up the entry flue between economizer and SCR denitration reactor and the export flue between SCR denitration reactor and the air preheater, from the top down sets gradually guide vane, rectification grid and catalyst in the SCR denitration reactor, be provided with ash removal device on the catalyst layer, ash removal device is including setting up at the outside air compressor machine of SCR denitration reactor, the branch pipe of setting on the catalyst layer and the house steward of intercommunication branch pipe and air compressor machine, the house steward outer wall is provided with heating device, house steward and branch connection's one end is provided with the temperature controller, the temperature controller is connected with the heating device electricity.
Through above-mentioned technical scheme, heating device heats the compressed air that gets into SCR denitration reactor, avoids cold compressed air to get into SCR denitration reactor, leads to SCR denitration reactor to hang down the low temperature excessively, and catalytic reaction is slow, generates the side reaction that is unfavorable for NOx degradation even to influence denitration reaction.
Further, the temperature setting interval of the temperature controller is 280-420 ℃.
By adopting the technical scheme, the temperature of the compressed air entering the SCR reactor is set to be 280-420 ℃, so that the phenomenon that the catalytic reaction is too low in temperature and the reaction is slow and insufficient is avoided; or the denitration reaction is influenced by the phenomenon that the temperature is too high and the catalyst is sintered at high temperature.
Further, the heating device is preferably an electromagnetic induction heater.
Through above-mentioned technical scheme, electromagnetic induction heater heating efficiency is high, can heat the compressed air in the house steward to the temperature range of setting for fast.
Further, the catalyst adopts a flat-plate catalyst.
Through the technical scheme, the flat-plate catalyst has a large-channel structure, and can avoid the blockage of dust to the maximum extent.
Furthermore, one end of the main pipe, which is close to the air compressor, penetrates through the air preheater.
Through above-mentioned technical scheme, the house steward passes the air preheater, and the air preheater preheats the compressed air in the house steward, has improved the utilization ratio of flue gas waste heat, reduces electromagnetic induction heater's energy consumption, and the energy can be saved improves the efficiency of heating simultaneously.
Further, a first dust collecting tank is fixedly connected to the inlet flue.
Through the technical scheme, solid particles settled in the flue gas entering the inlet flue are collected.
Further, the bottom of the SCR denitration reactor is fixedly connected with a second dust collecting tank.
Through the technical scheme, the dust cleaning device collects dust cleaned on the catalyst and dust settled in the flue gas under the action of dead weight.
Furthermore, the bottom of the first dust collecting groove and the bottom of the second dust collecting groove are fixedly connected with ball valves.
Through above-mentioned technical scheme, the ball valve has good leakproofness, can cut off dust collecting vat and external, conveniently opens the dust in the dust collecting vat simultaneously and retrieves.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. the heating device heats the compressed air entering the SCR denitration reactor, so that the phenomenon that the temperature of the SCR denitration reactor is too low and too low, the catalytic reaction speed is low and even a side reaction which is not beneficial to NOx degradation is generated to influence the denitration reaction due to the fact that cold compressed air enters the SCR denitration reactor is avoided;
2. the temperature controller controls the temperature of the compressed air entering the SCR reactor to be 280-420 ℃, so that the phenomenon that the denitration reaction is influenced due to the phenomenon that the catalyst is sintered at high temperature because the temperature is too low and the catalytic reaction speed is slow and the reaction is insufficient or the temperature is too high is avoided;
3. the main pipe penetrates through the air preheater, the air preheater preheats compressed air in the main pipe, the utilization rate of flue gas waste heat is improved, the energy consumption of the electromagnetic induction heater is reduced, energy is saved, and meanwhile the heating efficiency is improved.
Drawings
Fig. 1 is a schematic diagram for showing the overall structure of the present embodiment.
The reference symbols: 1. an SCR denitration reactor; 11. a guide vane; 12. a rectifying grid; 13. a catalyst; 2. a coal economizer; 3. an air preheater; 4. an inlet flue; 5. an outlet flue; 6. a dust removal device; 61. an air compressor; 62. a header pipe; 63. a branch pipe; 7. a temperature controller; 8. an electromagnetic induction heater; 9. a first dust collection tank; 10. a second dust collection tank; 111. a ball valve.
Detailed Description
The present invention will be described in further detail with reference to the following examples and accompanying drawings.
Example (b): as shown in fig. 1, an SCR denitration dust collector includes an SCR denitration reactor 1 for denitration treatment, an inlet flue 4 is connected to an inlet of the SCR denitration reactor 1, and one end of the inlet flue 4, which is far away from the SCR denitration reactor 1, is connected to an economizer 2. An outlet flue 5 is communicated with the outlet of the SCR denitration reactor 1. An air preheater 3 is arranged on the outlet flue 5. Flue gas after boiler combustion passes through economizer 2, then enters into SCR denitration reactor 1 through entry flue 4, utilizes SCR denitration reactor 1 to reduce the nitrogen oxide in the flue gas, and the flue gas through denitration reaction leaves from export flue 5.
The SCR denitration reactor 1 is internally provided with guide vanes 11, a rectifying grid 12 and a catalyst 13 from top to bottom in sequence. The catalyst 13 is preferably a V2O5-WO3(MoO3)/TiO2 catalyst. The ash cleaning device 6 is arranged above the catalyst, and the ash cleaning device 6 prevents dust from accumulating on the surface of the catalyst 13 and keeps the surface of the catalyst 13 clean, so that the activity of the catalyst 13 is ensured.
As shown in fig. 1, the ash removing device 6 includes an air compressor 61 for supplying compressed air, a branch pipe 63 provided on the catalyst 13 layer, and a header pipe 62 for connecting the branch pipe 63 and the air compressor 61. Because the optimal reaction temperature of SCR denitration is between 320 and 420 ℃, and the temperature of the compressed air output by the air compressor 61 is lower than the optimal reaction temperature of SCR denitration, the cold compressed air enters the SCR denitration reactor 1 to cause the internal temperature to be too low, which affects the catalytic reaction speed and even generates side reactions which are not beneficial to NOx degradation. In order to improve the temperature of the compressed air entering the SCR denitration reactor 1, the outer wall of the main pipe 62 is provided with a heating device, the heating device heats the compressed air in the main pipe 62, and a temperature controller 7 is fixedly connected at the joint of the main pipe 62 and the branch pipe 63 and used for detecting the temperature of the compressed air entering the SCR denitration reactor 1. The temperature controller 7 is electrically connected with the heating device, the temperature setting interval of the temperature controller 7 is 280-420 ℃, and the temperature value of the compressed air detected by the temperature controller 7 is compared with the set temperature so as to control the heating device to work. The heating device is preferably an electromagnetic induction heater 8, because the electromagnetic induction heater 8 has high heating efficiency and can rapidly heat the compressed air in the manifold 62 to a set temperature range. The manifold 62 passes through the air preheater 3 near one end of the air compressor 61. The air preheater 3 preheats the compressed air in the main pipe 62 by utilizing the outlet flue 5, thereby improving the utilization rate of the waste heat of the flue gas, reducing the energy consumption of heating and saving energy.
In order to further avoid the blockage of the catalyst 13, the catalyst 13 adopts a flat catalyst 13 with a large channel structure, so that the blockage of the catalyst 13 can be avoided to the greatest extent.
As shown in fig. 1, the flue gas entering the inlet flue 4 contains a large amount of solid particles, the solid particles settled under the self gravity are collected, the inlet flue 4 is fixedly connected with a first dust collecting tank 9, for recovering the dust in the first dust collecting tank 9, the bottom of the first dust collecting tank 9 is fixedly connected with a ball valve 111, because the ball valve 111 has good sealing performance, the first dust collecting tank 9 can be isolated from the outside, and meanwhile, the dust in the first dust collecting tank 9 can be conveniently recovered by opening. The bottom of the SCR denitration reactor 1 is fixedly connected with a second dust collecting tank 10, and the dust cleaned on the catalyst 13 by the dust cleaning device 6 and the dust settled in the flue gas under the action of dead weight are collected. The inlet flue 4 is U-shaped, and the first dust collecting tank 9 and the second dust collecting tank 10 are respectively located on both sides of the U-shaped bottom of the inlet flue 4, and the openings thereof are respectively aligned with two vertical sections of the inlet flue 4.
The specific implementation manner of this embodiment:
the air compressor 61 supplies compressed air to the SCR denitration reactor 1, and the compressed air is preheated and heated by the air preheater 3 and the electromagnetic induction heater 8, so that the temperature of the compressed air entering the SCR denitration reactor 1 is within the optimum temperature range of the catalytic reaction.
Claims (8)
1. An SCR denitration dust removal device comprises an SCR denitration reactor (1) for denitration treatment, an inlet flue (4) arranged between an economizer (2) and the SCR denitration reactor (1), and an outlet flue (5) arranged between the SCR denitration reactor (1) and an air preheater (3), wherein a guide vane (11), a rectifying grid (12) and a catalyst (13) are sequentially arranged in the SCR denitration reactor (1) from top to bottom, a dust cleaning device (6) is arranged on the catalyst (13) layer, the dust cleaning device (6) comprises an air compressor (61) arranged outside the SCR denitration reactor (1), a branch pipe (63) arranged on the catalyst (13) layer, and a header pipe (62) for communicating the branch pipe (63) with the air compressor (61), and is characterized in that a heating device is arranged on the outer wall of the header pipe (62), and a temperature controller (7) is arranged at one end of the header pipe (62) connected with the branch pipe (63), the temperature controller (7) is electrically connected with the heating device.
2. The SCR denitration dust collector of claim 1, wherein the temperature setting range of the temperature controller (7) is 280-420 ℃.
3. The SCR denitration dust collector of claim 1, wherein the heating device is an electromagnetic induction heater (8).
4. An SCR denitration dust collector as claimed in claim 1, wherein said catalyst (13) is a flat catalyst (13).
5. An SCR denitration dust removal device according to claim 1, wherein one end of the header pipe (62) close to the air compressor (61) passes through the air preheater (3).
6. The SCR denitration dust collector of claim 1, wherein a first dust collecting tank (9) is fixedly connected to the inlet flue (4).
7. The SCR denitration dust collector of claim 6, wherein a second dust collecting tank (10) is fixedly connected to the bottom of the SCR denitration reactor (1).
8. The SCR denitration dust collector of claim 7, wherein the bottom of the first dust collecting tank (9) and the bottom of the second dust collecting tank (10) are fixedly connected with ball valves (111).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723839.2U CN210845565U (en) | 2019-10-15 | 2019-10-15 | SCR denitration dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921723839.2U CN210845565U (en) | 2019-10-15 | 2019-10-15 | SCR denitration dust collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210845565U true CN210845565U (en) | 2020-06-26 |
Family
ID=71297142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921723839.2U Expired - Fee Related CN210845565U (en) | 2019-10-15 | 2019-10-15 | SCR denitration dust collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210845565U (en) |
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2019
- 2019-10-15 CN CN201921723839.2U patent/CN210845565U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200626 |
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| CF01 | Termination of patent right due to non-payment of annual fee |