CN104759206A - SCR flue gas denitrification device provided with temperature-raising flue gas mixer - Google Patents
SCR flue gas denitrification device provided with temperature-raising flue gas mixer Download PDFInfo
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- CN104759206A CN104759206A CN201510146672.8A CN201510146672A CN104759206A CN 104759206 A CN104759206 A CN 104759206A CN 201510146672 A CN201510146672 A CN 201510146672A CN 104759206 A CN104759206 A CN 104759206A
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Abstract
The invention relates to the field of flue gas denitrification, particularly to an SCR flue gas denitrification device provided with a temperature-raising flue gas mixer. The SCR flue gas denitrification device provided with the temperature-raising flue gas mixer comprises a boil tail flue, a coal saver and an SCR reactor. The device is characterized in that the inlet of the SCR reactor is connected with the coal saver through a main flue gas pipeline, a flue gas baffle plate door is arranged at the air inlet of the main flue gas pipeline, a flue gas mixer and an ammonia spraying grating are sequentially arranged above the flue gas baffle door, a temperature measuring device is mounted at the inlet of the SCR reactor, a homogenizing plate and a catalyst are mounted in the temperature measuring device, and the outlet is connected with an exhausting pipeline. According to the device provided by the invention, a bypass of a conventional SCR denitrification process is canceled and the denitrification system can normally operate when the unit is started at a low temperature, so that low-temperature poisoning of the catalyst is avoided and the service life of the catalyst is prolonged.
Description
Technical field
The present invention relates to denitrating flue gas field, particularly a kind of SCR equipment for denitrifying flue gas with intensification flue gas blender.
Background technology
The whole world enters the combustion process that more than 90% in the NOx of air derives from the fossil fuels such as coal, oil, natural gas every year, and it can cause greenhouse effects, depletion of the ozone layer and acid rain to be formed.Selective catalytic reduction (SCR) is the widest NOx emission control technology of current investigation and application.Under the effect of catalyst, with NH
3as reducing agent, the reacting with the NOx in flue gas and generate the N of nontoxic pollution-free of " selective "
2and H
2o.
Current environmental administration requires the full denitrating flue gas of denitrating system 100%, and denitration none-disk terminal, whole boiler smokes must be discharged by SCR denitration.The application of denitrating catalyst has certain temperature range restriction, and because unit also exists the situation of cold-starting operation, SCR denitration technology also exists weakness, namely catalyst is when boiler load is lower, the reduction of flue-gas temperature, will cause catalyst slow poisoning, causes catalyst activity to decline gradually.Therefore current denitrating technique all eliminates bypass duct, and when this just causes boiler load low, low-temperature flue gas must by SCR denitration, thus the danger causing denitrating catalyst poisoning, therefore traditional SCR technique will be subject to stern challenge more.
Summary of the invention
The present invention is in order to make up the defect of prior art, provide a kind of SCR equipment for denitrifying flue gas with intensification flue gas blender, while eliminating the bypass of traditional SCR denitration technique, denitrating system normally can run when Unit Low starts, and can prevent the catalyst poisoning that low temperature causes.
The present invention is achieved through the following technical solutions:
A kind of SCR equipment for denitrifying flue gas with intensification flue gas blender, comprise boiler back end ductwork, economizer and SCR reactor, it is characterized in that: described SCR Reactor inlet is connected with economizer by main flue gas pipeline, there is gas baffle door at the air inlet place of described main flue gas pipeline, the top of described gas baffle door is disposed with flue gas blender and ammonia-spraying grid, described SCR Reactor inlet place is provided with temperature measuring equipment, inside is provided with homogenating plate and denitrating catalyst, and outlet is connected with smoke discharging pipe.
Be connected with bypass intensification flue above the import of described economizer, described bypass intensification flue is provided with high-temperature flue gas baffle door, and is connected with flue gas mixing-chamber, and described baffle door and temperature measuring equipment have interlocking effect, temperature measuring equipment detects that temperature is high, and baffle door then opens certain angle.
Described flue gas mixing-chamber comprises electric operator, driving shaft and gas proportioning damper, when temperature measuring equipment detects the flue-gas temperature entering SCR reactor lower than catalyst permission minimum temperature, high-temperature flue gas baffle door is opened, according to detecting the flue-gas temperature entering SCR reactor, flue gas blender drives drive shaft turns by electric operator, gas proportioning damper is turned an angle, bypass high-temperature flue gas is made to enter main flue gas pipeline and low-temperature flue gas mixing, until when temperature measuring equipment detects that mixed flue-gas temperature meets the temperature requirement of catalyst, driving shaft stops operating, gas proportioning damper door aperture keeps motionless.
Described denitrating catalyst is corrugated plating catalyst.
The invention has the beneficial effects as follows: present invention eliminates the bypass of traditional SCR denitration technique, and can ensure that denitrating system normally can run when Unit Low starts, avoid catalyst low temperature poisoning, extend the service life of catalyst.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Accompanying drawing 1 is the structural representation of a kind of SCR equipment for denitrifying flue gas with intensification flue gas blender of the present invention;
Accompanying drawing 2 is the structural representation of flue gas blender in the present invention;
Accompanying drawing 3 is the structural representation of traditional SCR equipment for denitrifying flue gas.
In figure, 1, boiler back end ductwork, 2, gas baffle door, 3, ammonia-spraying grid, 4, main flue gas pipeline, 5, SCR reactor, 6, homogenating plate, 7 corrugated plating catalyst, 8, smoke discharging pipe, 9, bypass intensification flue, 10, high-temperature flue gas baffle door, 11, flue gas blender, 12, economizer, 13, temperature measuring equipment, 11-1, gas proportioning damper, 11-2 driving shaft.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated, but be not used for limiting the scope of the invention.
As shown in Figure 1, a kind of SCR equipment for denitrifying flue gas with intensification flue gas blender of the present invention, comprise boiler back end ductwork 1, economizer 12 and SCR reactor 5, it is characterized in that: the import of described SCR reactor 5 is connected with economizer 12 by main flue gas pipeline 4, there is gas baffle door 2 at the air inlet place of described main flue gas pipeline 4, the top of described gas baffle door 2 is disposed with flue gas blender 11 and ammonia-spraying grid 3, be connected with bypass intensification flue 9 above the import of economizer 12, described bypass intensification flue 9 is provided with high-temperature flue gas baffle door 10, and be connected with flue gas mixing-chamber 11, described high-temperature flue gas baffle door 10 has interlocking effect with temperature measuring equipment 13, described SCR reactor 5 import department is provided with temperature measuring equipment 13, inside is provided with homogenating plate 6 and corrugated plating catalyst 7, outlet is connected with smoke discharging pipe 8, described flue gas mixing-chamber 11 comprises electric operator, driving shaft 11-2 and gas proportioning damper 11-1, when temperature measuring equipment 13 detects the flue-gas temperature entering SCR reactor 5 lower than catalyst permission minimum temperature, baffle door 10 is opened, according to detecting the flue-gas temperature entering SCR reactor 5, flue gas blender 11 drives driving shaft 11-2 to rotate by electric operator, gas proportioning damper 11-1 is turned an angle, bypass high-temperature flue gas is made to enter main flue gas pipeline 4 and low-temperature flue gas mixing, until when temperature measuring equipment 13 detects that mixed flue-gas temperature meets the temperature requirement of catalyst 7, driving shaft 11-2 stops operating, gas proportioning damper door 11-1 aperture keeps motionless.
When the SCR equipment for denitrifying flue gas of band intensification flue gas blender of the present invention works, the gas baffle door 2, flue gas blender 11 and the ammonia-spraying grid 3 that arrange through main flue gas pipeline 4 from economizer 12 flue gas out enter SCR reactor 5, flue-gas temperature is in normal range (NR), high-temperature flue gas baffle door 10 is closed, and flue gas blender 11 is often opened.The mixed flue gas entering SCR reactor 5 enters corrugated plating catalyst 7 through homogenating plate 6, and the nitrogen oxide in flue gas is taken off under the effect of catalyst 7, and the flue gas after purification enters next procedure by smoke discharging pipe 8.When temperature measuring equipment 13 detects the temperature entering reactor lower than catalyst permission minimum temperature, the high-temperature flue gas baffle door 10 be installed on the high temperature bypass intensification flue 9 above economizer 12 import is opened, according to the flue-gas temperature entering SCR reactor 5 that checkout gear detects, flue gas blender 11 drives driving shaft 11-2 to rotate by electric operator, gas proportioning damper 11-1 is turned an angle, bypass high-temperature flue gas is made to enter main flue gas pipeline 4 and low-temperature flue gas mixing, until when temperature measuring equipment 13 detects that mixed flue-gas temperature meets the temperature requirement of catalyst 7, driving shaft 11-2 stops operating, gas proportioning damper door 11-1 aperture keeps motionless.Enter SCR reactor 5 flue-gas temperature like this and meet catalyst application temperature range, can ensure that the catalyst in reactor normally can work when Unit Low startup optimization, avoid catalyst low temperature poisoning, extend the service life of catalyst.
Present invention eliminates the bypass of traditional SCR denitration technique, and can ensure that denitrating system normally can run when Unit Low starts, avoid catalyst low temperature poisoning, extend the service life of catalyst.
Claims (4)
1. the SCR equipment for denitrifying flue gas with intensification flue gas blender, comprise boiler back end ductwork (1), economizer (12) and SCR reactor (5), it is characterized in that: the import of described SCR reactor (5) is connected with economizer (12) by main flue gas pipeline (4), there is gas baffle door (2) at the air inlet place of described main flue gas pipeline (4), the top of described gas baffle door (2) is disposed with flue gas blender (11) and ammonia-spraying grid (3), described SCR reactor (5) import department is provided with temperature measuring equipment (13), inside is provided with homogenating plate (6) and denitrating catalyst (7), outlet is connected with smoke discharging pipe (8).
2. a kind of SCR equipment for denitrifying flue gas with intensification flue gas blender according to claim 1, it is characterized in that: be connected with bypass intensification flue (9) above the import of described economizer (12), described bypass intensification flue (9) is provided with high-temperature flue gas baffle door (10), and be connected with flue gas mixing-chamber (11), described high-temperature flue gas baffle door (10) and temperature measuring equipment (13) have interlocking effect.
3. a kind of SCR equipment for denitrifying flue gas with intensification flue gas blender according to claim 1, is characterized in that: described flue gas mixing-chamber (11) comprises electric operator, driving shaft (11-2) and gas proportioning damper (11-1).
4. a kind of SCR equipment for denitrifying flue gas with intensification flue gas blender according to claim 1, is characterized in that: described denitrating catalyst (7) is corrugated plating catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510146672.8A CN104759206A (en) | 2015-03-31 | 2015-03-31 | SCR flue gas denitrification device provided with temperature-raising flue gas mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510146672.8A CN104759206A (en) | 2015-03-31 | 2015-03-31 | SCR flue gas denitrification device provided with temperature-raising flue gas mixer |
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| CN104759206A true CN104759206A (en) | 2015-07-08 |
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|---|---|---|---|
| CN201510146672.8A Pending CN104759206A (en) | 2015-03-31 | 2015-03-31 | SCR flue gas denitrification device provided with temperature-raising flue gas mixer |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402746A (en) * | 2015-12-24 | 2016-03-16 | 哈尔滨锅炉厂有限责任公司 | Membrane type wall tube screen tube-bending device for forming smoke exhaust opening and smoke gas mixing method |
| CN105716102A (en) * | 2016-03-24 | 2016-06-29 | 佛山市顺德五沙热电有限公司 | System for optimizing air taking manner of dilution fans of power plant denitration devices |
| CN105716100A (en) * | 2016-03-31 | 2016-06-29 | 大唐环境产业集团股份有限公司 | Denitrating coal economizer high-temperature bypass device |
| CN106362590A (en) * | 2016-11-03 | 2017-02-01 | 广东电网有限责任公司电力科学研究院 | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device |
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
| CN107126834A (en) * | 2017-05-26 | 2017-09-05 | 中国华电集团科学技术研究总院有限公司 | A kind of flue gas denitrification system and method for denitration |
| CN107202317A (en) * | 2017-06-06 | 2017-09-26 | 华能国际电力股份有限公司长兴电厂 | Pollutant zero surpasses the control method of row during a kind of unit starting |
| CN107617332A (en) * | 2017-09-13 | 2018-01-23 | 大唐东北电力试验研究所有限公司 | Solves the uneven vertical gas pass flow-disturbing system and method in SCR inlet temperature flow field |
| CN107837677A (en) * | 2017-09-13 | 2018-03-27 | 大唐东北电力试验研究所有限公司 | Solves the uneven horizontal flue flow-disturbing system and method in SCR inlet temperature flow field |
| CN112403223A (en) * | 2019-11-06 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Heat exchange type system and method for removing carbon monoxide and denitration from flue gas |
| CN113883542A (en) * | 2021-09-28 | 2022-01-04 | 华能巢湖发电有限责任公司 | Boiler economizer flue gas bypass adjusting equipment |
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| CN102927577A (en) * | 2012-11-20 | 2013-02-13 | 上海锅炉厂有限公司 | Flue distribution manner applied to negative omnidistance load commissioning of denitration equipment |
| CN103084064A (en) * | 2013-01-18 | 2013-05-08 | 广东电网公司电力科学研究院 | System and method for improving operation capacity of SCR (Silicon Controlled Rectifier) denitration device in electric power plant |
| CN204395779U (en) * | 2015-03-31 | 2015-06-17 | 山东鑫源环保工程技术有限公司 | A kind of SCR equipment for denitrifying flue gas with intensification flue gas blender |
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2015
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Patent Citations (3)
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| CN102927577A (en) * | 2012-11-20 | 2013-02-13 | 上海锅炉厂有限公司 | Flue distribution manner applied to negative omnidistance load commissioning of denitration equipment |
| CN103084064A (en) * | 2013-01-18 | 2013-05-08 | 广东电网公司电力科学研究院 | System and method for improving operation capacity of SCR (Silicon Controlled Rectifier) denitration device in electric power plant |
| CN204395779U (en) * | 2015-03-31 | 2015-06-17 | 山东鑫源环保工程技术有限公司 | A kind of SCR equipment for denitrifying flue gas with intensification flue gas blender |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402746B (en) * | 2015-12-24 | 2018-04-27 | 哈尔滨锅炉厂有限责任公司 | Membrane panel smoking mouth swan neck system and mixed flue gas method |
| CN105402746A (en) * | 2015-12-24 | 2016-03-16 | 哈尔滨锅炉厂有限责任公司 | Membrane type wall tube screen tube-bending device for forming smoke exhaust opening and smoke gas mixing method |
| CN105716102A (en) * | 2016-03-24 | 2016-06-29 | 佛山市顺德五沙热电有限公司 | System for optimizing air taking manner of dilution fans of power plant denitration devices |
| CN105716100A (en) * | 2016-03-31 | 2016-06-29 | 大唐环境产业集团股份有限公司 | Denitrating coal economizer high-temperature bypass device |
| CN106362590A (en) * | 2016-11-03 | 2017-02-01 | 广东电网有限责任公司电力科学研究院 | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device |
| CN107126834A (en) * | 2017-05-26 | 2017-09-05 | 中国华电集团科学技术研究总院有限公司 | A kind of flue gas denitrification system and method for denitration |
| CN107126834B (en) * | 2017-05-26 | 2023-07-04 | 中国华电集团科学技术研究总院有限公司 | Flue gas denitration system and denitration method |
| CN107202317A (en) * | 2017-06-06 | 2017-09-26 | 华能国际电力股份有限公司长兴电厂 | Pollutant zero surpasses the control method of row during a kind of unit starting |
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
| CN107008147B (en) * | 2017-06-09 | 2023-01-31 | 国能南京电力试验研究有限公司 | Ammonia spraying device for SCR denitration system |
| CN107617332A (en) * | 2017-09-13 | 2018-01-23 | 大唐东北电力试验研究所有限公司 | Solves the uneven vertical gas pass flow-disturbing system and method in SCR inlet temperature flow field |
| CN107837677A (en) * | 2017-09-13 | 2018-03-27 | 大唐东北电力试验研究所有限公司 | Solves the uneven horizontal flue flow-disturbing system and method in SCR inlet temperature flow field |
| CN112403223A (en) * | 2019-11-06 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Heat exchange type system and method for removing carbon monoxide and denitration from flue gas |
| CN112403223B (en) * | 2019-11-06 | 2022-06-07 | 中冶长天国际工程有限责任公司 | Heat exchange type system and method for removing carbon monoxide and denitration from flue gas |
| CN113883542A (en) * | 2021-09-28 | 2022-01-04 | 华能巢湖发电有限责任公司 | Boiler economizer flue gas bypass adjusting equipment |
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Application publication date: 20150708 |