CN114028942B - Device and method for preventing SCR reactor from being blocked and catalyst from being poisoned - Google Patents
Device and method for preventing SCR reactor from being blocked and catalyst from being poisoned Download PDFInfo
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- CN114028942B CN114028942B CN202111448865.0A CN202111448865A CN114028942B CN 114028942 B CN114028942 B CN 114028942B CN 202111448865 A CN202111448865 A CN 202111448865A CN 114028942 B CN114028942 B CN 114028942B
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- flue
- flue gas
- scr reactor
- separation
- preventing
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- 239000003054 catalyst Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000003546 flue gas Substances 0.000 claims abstract description 60
- 238000000926 separation method Methods 0.000 claims abstract description 39
- 239000000428 dust Substances 0.000 claims abstract description 21
- 239000000779 smoke Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000005192 partition Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 231100000572 poisoning Toxicity 0.000 claims description 9
- 230000000607 poisoning effect Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 10
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000010881 fly ash Substances 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
Classifications
-
- 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
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (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)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to an SCR (selective catalytic reduction) reactor, in particular to a device and a method for preventing the SCR reactor from being blocked and a catalyst from being poisoned for a denitration system of an industrial furnace waste heat boiler with high dust and smoke as a carrier. The device comprises a waste heat boiler, wherein the waste heat boiler is communicated with a convection heating surface of the boiler, the convection heating surface of the boiler is arranged in a tail flue, a flue partition is arranged below the convection heating surface of the boiler, an SCR (selective catalytic reduction) reactor is arranged below the flue partition, a through flue and a separation flue are arranged in the flue partition, the separation flue is connected with a dry cyclone separator outside the tail flue through a separation pipeline, one end of a flue gas return pipe is arranged on the upper part of the dry cyclone separator, and one end of the flue gas return pipe is connected with the separation flue. The invention has the advantages that: the invention has simple process and convenient installation and management of the device; the system has high dust removing efficiency, no electricity consumption, no gas consumption and other consumption, and low running cost.
Description
Technical Field
The invention relates to an SCR (selective catalytic reduction) reactor, in particular to a device and a method for preventing the SCR reactor from being blocked and a catalyst from being poisoned for a denitration system of an industrial furnace waste heat boiler with high dust and smoke as a carrier.
Background
In recent years, along with the increase of national energy conservation and emission reduction force, the national requirements on various emission indexes of industrial kilns are clear and stricter. The NO x emission value in the atmospheric pollutant emission index is an important control index. Flue gas denitration technology is mainly divided into selective non-catalytic reduction denitration technology (SNCR) and selective catalytic reduction denitration technology (SCR).
The highest denitration efficiency of the SCR flue gas denitration technology can reach more than 90%, and the SCR flue gas denitration technology is one of the most mature and reliable denitration methods. The SCR catalyst has an optimal activity range of 300-400 ℃, is generally arranged on the tail heating surface of the waste heat boiler, and operates in a higher dust environment.
Ammonium salt in the flue gas and small solid particles in the fly ash can be deposited in small holes of the catalyst, so that a catalyst channel is blocked, and the catalyst is passivated; alkali metals (Na, ca, si, as) in the fly ash can "poison" the catalyst, affecting the catalyst's life and efficiency.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for preventing an SCR (selective catalytic reduction) reactor from being blocked and a catalyst from being poisoned, and aims to improve the service life of the SCR catalyst in a high ash smoke environment and ensure the denitration efficiency of the SCR catalytic reactor.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The utility model provides an prevent SCR reactor jam, catalyst poisoning device, including exhaust-heat boiler, exhaust-heat boiler and boiler convection heating face intercommunication, boiler convection heating face establish in the afterbody flue, be equipped with the flue compartment below the boiler convection heating face, the flue compartment below is equipped with the SCR reactor, be equipped with through flue and separation flue in the flue compartment, separation flue passes through the separation pipeline and is connected with the dry-type cyclone outside the afterbody flue, flue gas return tube one end is established in dry-type cyclone upper portion, flue gas return tube one end is connected with the separation flue.
And the smoke inlet and the smoke outlet of the SCR reactor are respectively provided with a pressure sensor.
And an economizer is arranged below the SCR reactor.
And the connection part of the smoke return pipe and the separation flue is arranged below the smoke regulating valve on the separation flue.
The flue gas regulating valve on the separation flue is arranged below the joint of the separation flue and the separation pipeline.
The dry cyclone separator is internally lined with a wear-resistant heat insulation lining, and the bottom of the dry cyclone separator is provided with a dust collection chamber and an ash discharge valve.
Before high ash content flue gas enters the SCR reactor, when passing through the flue partition, the flue gas is divided into two parts, one part of the flue gas directly enters the SCR reactor, the other part of the flue gas is introduced into the dry cyclone separator through the high temperature regulating valve, solid particles carried by the high speed flue gas are separated from the flue gas under the action of large inertial centrifugal force, enter the dust collection chamber of the dry cyclone separator, and the flue gas after dust removal returns to the separation flue through the flue gas return pipe and enters the SCR reactor.
The differential pressure of the SCR reactor is a feedback signal, the opening of the two flue gas regulating valves is controlled, and the flue gas flow entering the dry cyclone separator is controlled.
The invention has the advantages that: the invention has simple process and convenient installation and management of the device; the system has high dust removal efficiency, no electricity consumption, gas consumption and other consumption, and low operation cost; flue gas dust removal is automatically regulated; the flue gas dividing chamber is arranged, so that the flue gas flow entering the dry cyclone separator is reduced, the initial investment is reduced, and the furnace shutdown of the waste heat boiler caused by the failure of the dust remover is avoided. The adopted dry cyclone separator has the characteristics of simple structure, less accessory equipment, high operation rate and the like, and effectively removes solid particles such as dust in flue gas. The method can automatically reduce the dust content in the flue gas entering the SCR reactor, and effectively prevent the SCR reactor from being blocked and the catalyst from being poisoned.
Drawings
Fig. 1 is a process flow diagram of the present invention.
In the figure: 1. a waste heat boiler; 2. convection heating surface of boiler; 3. a flue compartment; 4. an SCR reactor; 5. an economizer; 6. a dry cyclone separator; 7. a flue gas regulating valve; 8. a flue gas return pipe; 9. an ash discharge valve; 10. through the flue; 11. separating a flue; 12. a tail flue; 13. separating the pipeline.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in the figure, the device for preventing the SCR reactor from being blocked and catalyst poisoning comprises a waste heat boiler 1, wherein the waste heat boiler 1 is communicated with a boiler convection heating surface 2, the boiler convection heating surface 2 is arranged in a tail flue 12, a flue partition 3 is arranged below the boiler convection heating surface 2, the SCR reactor 4 is arranged below the flue partition 3, a through flue 10 and a separation flue 11 are arranged in the flue partition 3, the separation flue 11 is connected with a dry cyclone separator 6 outside the tail flue 12 through a separation pipeline 13, one end of a flue gas return pipe 8 is arranged at the upper part of the dry cyclone separator 6, and one end of the flue gas return pipe 8 is connected with the separation flue 11.
The smoke inlet and the smoke outlet of the SCR reactor 4 are respectively provided with a pressure sensor.
An economizer 5 is arranged below the SCR reactor 4.
The separation flue 11 and the separation pipeline 13 are respectively provided with a flue gas regulating valve 7, and the joint of the flue gas return pipe 7 and the separation flue 11 is arranged below the flue gas regulating valve 7 on the separation flue 11.
The flue gas regulating valve 7 on the separation flue 11 is arranged below the joint of the separation flue 11 and the separation pipeline 13.
The dry cyclone separator 6 is internally lined with a wear-resistant heat insulation lining, and the bottom is provided with a dust collection chamber and an ash discharge valve 9.
Before high ash content flue gas enters the SCR reactor 4, the flue gas is divided into two parts when passing through the flue separation chamber 3, one part of the flue gas directly enters the SCR reactor 4, the other part of the flue gas is introduced into the dry cyclone separator 6 through the flue gas regulating valve 7, solid particles carried by the high speed flue gas are separated from the flue gas under the action of large inertial centrifugal force and enter a dust collection chamber of the dry cyclone separator 6, and the dust removed flue gas returns to the separation flue 11 through the flue gas return pipe 8 and enters the SCR reactor 4. The flue gas is divided into two parts, so that the flow of the flue gas entering the dry cyclone separator can be reduced, the investment of accessories such as the cyclone separator and a pipeline is reduced, and meanwhile, the phenomenon that a waste heat boiler is forced to stop due to the failure of the dust remover is avoided.
The pressure difference between the smoke inlet and the smoke outlet of the SCR reactor 4 is a feedback signal, the opening of the two smoke regulating valves 7 is controlled, and the flow of smoke entering the dry cyclone separator 6 is controlled.
According to the invention, the inlet valve of the dry cyclone separator and the downstream valve of the dust removing flue are regulated by pressure difference signals, so that the dust content in flue gas entering the SCR reactor is automatically reduced.
Claims (8)
1. The utility model provides an prevent SCR reactor jam, catalyst poisoning device, includes exhaust-heat boiler, its characterized in that exhaust-heat boiler and boiler convection heating face intercommunication, boiler convection heating face establish in the afterbody flue, be equipped with the flue compartment below the boiler convection heating face, the flue compartment below is equipped with the SCR reactor, be equipped with through flue and separation flue in the flue compartment, the separation flue passes through the separation pipeline and is connected with the dry-type cyclone outside the afterbody flue, flue gas return tube one end is established in dry-type cyclone upper portion, flue gas return tube one end is connected with the separation flue.
2. The device for preventing the blockage and the catalyst poisoning of the SCR reactor as recited in claim 1, wherein the smoke inlet and the smoke outlet of the SCR reactor are respectively provided with a pressure sensor.
3. The device for preventing the blockage and the catalyst poisoning of the SCR reactor as recited in claim 2, wherein an economizer is arranged below the SCR reactor.
4. The device for preventing the blockage and the catalyst poisoning of the SCR reactor as recited in claim 1, wherein the separation flue and the separation pipeline are respectively provided with a flue gas regulating valve, and the joint of the flue gas return pipe and the separation flue is arranged below the flue gas regulating valve on the separation flue.
5. The device for preventing the blockage of the SCR reactor and the poisoning of the catalyst as recited in claim 4, wherein the flue gas regulating valve on the separation flue is arranged below the joint of the separation flue and the separation pipeline.
6. The device for preventing the blockage and the catalyst poisoning of the SCR reactor as recited in claim 1, wherein the dry cyclone separator is internally lined with a wear-resistant heat insulation lining, and a dust collection chamber and an ash discharge valve are arranged at the bottom.
7. The method for preventing the blockage of the SCR reactor and the poisoning of the catalyst according to claim 1, wherein before the high ash content flue gas enters the SCR reactor, the flue gas is divided into two parts when passing through a flue partition, one part of the flue gas directly enters the SCR reactor, the other part of the flue gas is introduced into a dry cyclone separator through a high temperature regulating valve, solid particles carried by the high-speed flue gas are separated from the flue gas under the action of a large inertial centrifugal force and enter a dust collection chamber of the dry cyclone separator, and the flue gas after dust removal is returned to a separation flue through a flue gas return pipe and then enters the SCR reactor.
8. The method for preventing a device from being blocked and poisoned by an SCR reactor as claimed in claim 7, wherein the pressure difference of the SCR reactor is a feedback signal, the opening degree of two flue gas regulating valves is controlled, and the flue gas flow entering the dry cyclone separator is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448865.0A CN114028942B (en) | 2021-12-01 | 2021-12-01 | Device and method for preventing SCR reactor from being blocked and catalyst from being poisoned |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448865.0A CN114028942B (en) | 2021-12-01 | 2021-12-01 | Device and method for preventing SCR reactor from being blocked and catalyst from being poisoned |
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| Publication Number | Publication Date |
|---|---|
| CN114028942A CN114028942A (en) | 2022-02-11 |
| CN114028942B true CN114028942B (en) | 2024-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111448865.0A Active CN114028942B (en) | 2021-12-01 | 2021-12-01 | Device and method for preventing SCR reactor from being blocked and catalyst from being poisoned |
Country Status (1)
| Country | Link |
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| CN (1) | CN114028942B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736394A (en) * | 2014-01-02 | 2014-04-23 | 上海交通大学 | Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device |
| CN110038433A (en) * | 2019-05-13 | 2019-07-23 | 哈尔滨工业大学 | A kind of SCR inlet flue gas preprocessing system and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5167931A (en) * | 1990-03-28 | 1992-12-01 | The Babcock & Wilcox Company | SO2 control using moving granular beds |
| US7021248B2 (en) * | 2002-09-06 | 2006-04-04 | The Babcock & Wilcox Company | Passive system for optimal NOx reduction via selective catalytic reduction with variable boiler load |
| US7736608B2 (en) * | 2007-11-29 | 2010-06-15 | General Electric Company | Methods and systems for reducing the emissions from combustion gases |
| DE102013016701B4 (en) * | 2013-10-08 | 2017-06-14 | Khd Humboldt Wedag Gmbh | Process for the denitrification of bypass exhaust gases in a plant for the production of cement clinker and plant for the production of cement clinker |
| CN110860177B (en) * | 2019-11-27 | 2022-02-22 | 中国石油化工股份有限公司 | Flue gas purification device and flue gas purification method |
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2021
- 2021-12-01 CN CN202111448865.0A patent/CN114028942B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736394A (en) * | 2014-01-02 | 2014-04-23 | 上海交通大学 | Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device |
| CN110038433A (en) * | 2019-05-13 | 2019-07-23 | 哈尔滨工业大学 | A kind of SCR inlet flue gas preprocessing system and method |
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| Publication number | Publication date |
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| CN114028942A (en) | 2022-02-11 |
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