CN203043817U - Selective catalytic reduction (SCR) denitration system capable of increasing flue gas temperature by utilizing high-temperature steam - Google Patents
Selective catalytic reduction (SCR) denitration system capable of increasing flue gas temperature by utilizing high-temperature steam Download PDFInfo
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- CN203043817U CN203043817U CN 201320038928 CN201320038928U CN203043817U CN 203043817 U CN203043817 U CN 203043817U CN 201320038928 CN201320038928 CN 201320038928 CN 201320038928 U CN201320038928 U CN 201320038928U CN 203043817 U CN203043817 U CN 203043817U
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Abstract
The utility model discloses a selective catalytic reduction (SCR) denitration system capable of increasing flue gas temperature by utilizing high-temperature steam. An outlet of a hearth is connected with a horizontal flue and an economizer sequentially; an inlet of an SCR reactor is connected with the economizer through a flue gas connecting pipe; a flow guide plate, an ammonia spraying grid, a steam spraying grid and a static mixer are arranged in the flue gas connecting pipe sequentially; a boiler steam pipeline and a steam turbine steam pipeline are connected with an auxiliary steam header respectively; a steam outlet of the auxiliary steam header is connected with the steam spraying grid through a steam baffle; the lower part of the SCR reactor is connected with a static dust remover through a flue gas output pipe; the static dust remover is connected with an outlet of the SCR reactor through the flue gas output pipe; a flue as baffle and an air preheater are arranged in the flue gas output pipe sequentially; and a fan is connected with the hearth through an air pipeline of the air preheater. According to the SCR denitration system, a high-temperature steam spraying device is mounted at the upstream of a denitration catalyst and adjacent to the downstream of the ammonia spraying grid and the flue gas temperature is increased by utilizing the steam of the steam turbine, so that the catalytic effect of the denitration catalyst in an active reaction temperature interval is guaranteed and the available rate of a denitration device is increased.
Description
Technical field
The utility model belongs to SCR catalyst for denitrating flue gas technology.By in the upstream of denitrating catalyst, the downstream of next-door neighbour's ammonia-spraying grid the high-temperature steam spray equipment being installed, utilize steam turbine steam to improve flue-gas temperature, guarantee that denitrating catalyst in the operation of active reaction temperature, improves the availability of denitrification apparatus.
Background technology
In conventional scr technology, because the active reaction temperature of denitrating catalyst is at 320-400 ℃, so the denitrating catalyst arrangement is between economizer and air preheater.When boiler load or coal change, cause this interval flue-gas temperature to surpass the active reaction temperature range of denitrating catalyst through regular meeting.
When flue-gas temperature is crossed when low, especially when temperature is lower than the minimum spray ammonia temperature of denitrating catalyst, must in time stops to spray ammonia, otherwise can cause the obstruction of the air preheater in denitrating catalyst and downstream, influence the operation of steam generator system.After denitrating system stops to spray ammonia, can't carry out denitrating flue gas, can cause NO
xHigh concentration discharging, serious environment pollution.The active reaction temperature that flue-gas temperature is remained on denitrating catalyst is extremely important, otherwise can influence security and the availability of denitrating system.
Summary of the invention
The purpose that the utility model proposes is at the deficiencies in the prior art, and a kind of SCR denitrating system that utilizes high-temperature steam to improve flue-gas temperature is provided.
The purpose of this utility model is achieved through the following technical solutions: a kind of method of utilizing high-temperature steam to improve SCR denitrification apparatus utilization rate, and it comprises: flue gas access tube, deflector, ammonia-spraying grid, static mixer, SCR reactor, ammonia/air mixer, ammonia evaporator, storage ammonia jar, unload ammonia compressor, pressure fan, slag-blowing equipmemt, gas baffle, hot air duct, blower fan, air preheater, electrostatic precipitator, air-introduced machine, steam and spray grid, Boiler Steam pipeline, steam turbine pipeline, auxilliary vapour header and steam baffle; Wherein, described furnace outlet is connected with economizer with horizontal flue successively.The entrance of SCR reactor links to each other with economizer by the flue gas access tube, arranges successively in the flue gas access tube that deflector, ammonia-spraying grid, steam spray grid, static mixer; The Boiler Steam pipeline links to each other with auxilliary vapour header respectively with the steam turbine steam pipework; Auxilliary vapour header steam (vapor) outlet sprays grid by steam baffle and steam and links to each other; Described SCR reactor lower part is connected with electrostatic precipitator by the flue gas efferent duct, and electrostatic precipitator is connected by the flue gas efferent duct with the outlet of SCR reactor, arranges gas baffle and air preheater in the flue gas efferent duct successively; Blower fan links to each other with burner hearth by the air duct of air preheater; Unload ammonia compressor and link to each other with the entrance of storage ammonia jar, ammonia evaporator links to each other with storage ammonia jar, is used for ammoniacal liquor in the evaporation storage ammonia jar; The outlet of storage ammonia jar is connected with the ammonia entrance of ammonia/air mixer by the ammonia fairlead; Pressure fan links to each other with the air intake of ammonia/air mixer by the air efferent duct; The outlet of ammonia/air mixer links to each other with the nozzle of ammonia-spraying grid, and the nozzle of ammonia-spraying grid is consistent with the flow of flue gas direction; Electrostatic precipitator links to each other with air-introduced machine.
The beneficial effects of the utility model are, the utility model is by installing the high-temperature steam spray equipment in the upstream of denitrating catalyst, the downstream of next-door neighbour's ammonia-spraying grid, utilize steam turbine steam to improve flue-gas temperature, guarantee that denitrating catalyst plays catalytic action in the active reaction temperature range, improve the availability of denitrification apparatus.
Description of drawings
Fig. 1 is that the utility model utilizes high-temperature steam to improve the SCR denitrating system structural representation of flue-gas temperature;
Among the figure: burner hearth 1, horizontal flue 2, economizer 3, flue gas access tube 4, deflector 5, ammonia-spraying grid 6, static mixer 7, SCR reactor 8, catalyst 9, ammonia/air mixer 10, ammonia fairlead 11, ammonia evaporator 12, storage ammonia jar 13, liquefied ammonia tank vehicle 14, unload ammonia compressor 15, pressure fan 16, air efferent duct 17, slag-blowing equipmemt 18, gas baffle 19, hot air duct 20, blower fan 21, air preheater 22, flue gas efferent duct 23, electrostatic precipitator 24, air-introduced machine 25, FGD desulphurization plant 26, steam sprays grid 27, Boiler Steam pipeline 28, steam turbine pipeline 29, auxilliary vapour header 30 and steam baffle 31.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further described, it is more obvious that the purpose of this utility model and effect will become.
As shown in Figure 1, the utility model SCR denitrating system of utilizing high-temperature steam to improve flue-gas temperature comprises: flue gas access tube 4, deflector 5, ammonia-spraying grid 6, static mixer 7, SCR reactor 8, ammonia/air mixer 10, ammonia evaporator 12, storage ammonia jar 13, unload ammonia compressor 15, pressure fan 16, slag-blowing equipmemt 18, gas baffle 19, hot air duct 20, blower fan 21, air preheater 22, electrostatic precipitator 24, air-introduced machine 25, steam and spray grid 27, Boiler Steam pipeline 28, steam turbine pipeline 29, auxilliary vapour header 30 and steam baffle 31.Burner hearth 1 outlet is connected with economizer 3 with horizontal flue 2 successively.The entrance of SCR reactor 8 links to each other with economizer 3 by flue gas access tube 4, arranges successively in the flue gas access tube 4 that deflector 5, ammonia-spraying grid 6, steam spray grid 27 and static mixer 7; Boiler Steam pipeline 28 links to each other with auxilliary vapour header 30 respectively with steam turbine steam pipework 29; Auxilliary vapour header 30 steam (vapor) outlets spray grid 27 by steam baffle 31 and steam and link to each other; Described SCR reactor 8 bottoms are connected with electrostatic precipitator 24 by flue gas efferent duct 23, and electrostatic precipitator 24 is connected by flue gas efferent duct 23 with the outlet of SCR reactor 8, arranges gas baffle 19 and air preheater 22 in the flue gas efferent duct 23 successively; Blower fan 21 links to each other with burner hearth 1 by the air duct of air preheater 22 successively; Unload ammonia compressor 15 and link to each other with the entrance of storage ammonia jar 13, ammonia evaporator 12 links to each other with storage ammonia jar 13, is used for ammoniacal liquor in the evaporation storage ammonia jar 13; The outlet of storage ammonia jar 13 is connected with the ammonia entrance of ammonia/air mixer 10 by ammonia fairlead 11; Pressure fan 16 links to each other with the air intake of ammonia/air mixer 10 by air efferent duct 17; The outlet of ammonia/air mixer 10 links to each other with the nozzle of ammonia-spraying grid 6, and the nozzle of ammonia-spraying grid 6 is consistent with the flow of flue gas direction; Electrostatic precipitator 24 links to each other with air-introduced machine 25.
The course of work of the present utility model is as follows: after the boiler operatiopn, burner hearth 1 produces high-temperature flue gas and enters static mixer 7 by horizontal flue 2, economizer 3, ammonia-spraying grid 6, two-fluid injection grid 27 successively; After the ammonia steam that ammonia evaporator 13 produces entered ammonia/air mixer 10, the air of sending here with pressure fan 16 mixed, and forms certain density ammonia, and is sprayed in the flue gas by ammonia-spraying grid 6; High-temperature flue gas and ammonia enter SCR reactor 8 after mixing in static mixer 7; When the flue-gas temperature that records is lower than the minimum spray ammonia temperature of denitrating catalyst, open the high-temperature steam injection channel, spray grid 27 by two-fluid and carry out high-temperature steam and spray, improve flue-gas temperature, prevent from being lower than when temperature the minimum spray ammonia temperature of denitrating catalyst.Because when flue-gas temperature is lower than the minimum spray ammonia temperature of denitrating catalyst, must stop to spray ammonia, avoid the air preheater in denitrating catalyst and downstream to stop up, thereby influence the operation of steam generator system.After denitrating system stops to spray ammonia, can't carry out denitrating flue gas, can cause NO again
xHigh concentration discharging, serious environment pollution.In addition, when the flue-gas temperature that records satisfies the denitrating catalyst normal operating temperature, the steam off passage.At the boiler startup initial stage, auxiliary steam directly comes to the boiler heating back steam that produces, and after the normal operation of boiler, high-temperature steam comes to steam turbine high-pressure cylinder, and fresh water (FW) then is the general industry water.In SCR reactor 8, NO in the flue gas
xWith the ammonia of ammonia-spraying grid 6 ejections under the effect of catalyst 9 selective catalytic reduction reaction takes place, NO
xBe reduced into N
2And H
2O.Purify the back flue gas and enter low-temperature air preheater, electrostatic precipitator successively, send into follow-up FGD desulphurization plant by air-introduced machine again and carry out the desulfurization processing, go out by smoke stack emission at last.
Claims (1)
1. SCR denitrating system that utilizes high-temperature steam to improve flue-gas temperature, burner hearth (1) outlet is connected with economizer (3) with horizontal flue (2) successively; It comprises: flue gas access tube (4), deflector (5), ammonia-spraying grid (6), static mixer (7), SCR reactor (8), ammonia/air mixer (10), ammonia evaporator (12), storage ammonia jar (13), unload ammonia compressor (15), pressure fan (16), slag-blowing equipmemt (18), gas baffle (19), hot air duct (20), blower fan (21), air preheater (22), electrostatic precipitator (24), air-introduced machine (25), steam sprays grid (27), Boiler Steam pipeline (28), steam turbine pipeline (29), auxilliary vapour header (30) and steam baffle (31); Wherein, the entrance of SCR reactor (8) links to each other with economizer (3) by flue gas access tube (4), arranges successively in the flue gas access tube (4) that deflector (5), ammonia-spraying grid (6), steam spray grid (27), static mixer (7); Boiler Steam pipeline (28) links to each other with auxilliary vapour header (30) respectively with steam turbine steam pipework (29); Auxilliary vapour header (30) sprays grid (27) by steam baffle (31) and steam and links to each other; Described SCR reactor (8) bottom is connected with electrostatic precipitator (24) by flue gas efferent duct (23), arranges gas baffle (19) and air preheater (22) in the flue gas efferent duct (23) successively; Blower fan (21) links to each other with burner hearth (1) by the air duct of air preheater (22); Unload ammonia compressor (15) and link to each other with the entrance of storage ammonia jar (13), ammonia evaporator (12) links to each other with storage ammonia jar (13), is used for ammoniacal liquor in the evaporation storage ammonia jar; The outlet of storage ammonia jar (13) is connected with the ammonia entrance of ammonia/air mixer (10) by ammonia fairlead (11); Pressure fan (16) links to each other with the air intake of ammonia/air mixer (10) by air efferent duct (17); The outlet of ammonia/air mixer (10) links to each other with the nozzle of ammonia-spraying grid (6), and the nozzle of ammonia-spraying grid (6) is consistent with the flow of flue gas direction; Electrostatic precipitator (24) links to each other with air-introduced machine (25).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320038928 CN203043817U (en) | 2013-01-24 | 2013-01-24 | Selective catalytic reduction (SCR) denitration system capable of increasing flue gas temperature by utilizing high-temperature steam |
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| CN 201320038928 CN203043817U (en) | 2013-01-24 | 2013-01-24 | Selective catalytic reduction (SCR) denitration system capable of increasing flue gas temperature by utilizing high-temperature steam |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953918A (en) * | 2014-04-28 | 2014-07-30 | 首钢京唐钢铁联合有限责任公司 | Oxygen-enriched combustion system and process for coal gas-pulverized coal mixed combustion power station boiler |
| CN104896459A (en) * | 2015-06-26 | 2015-09-09 | 安徽皖苏电力运检科技有限公司 | Full cold-state starting system without auxiliary steam source for supercritical generating unit |
| CN106994302A (en) * | 2017-05-03 | 2017-08-01 | 江苏天楹环保能源成套设备有限公司 | A kind of new and effective SCR denitration system |
| CN107158912A (en) * | 2017-05-09 | 2017-09-15 | 东莞市大能环保科技有限公司 | A kind of high-temperature steam is atomized denitrification apparatus |
| CN109092018A (en) * | 2018-08-13 | 2018-12-28 | 大同新成新材料股份有限公司 | A kind of flue gas desulfurization and denitration method and device |
| EP3560575A1 (en) * | 2018-04-25 | 2019-10-30 | Mitsubishi Hitachi Power Systems Europe GmbH | Flue gas denitrification method and flue-gas denitrification system for performing the method suitable for integration into a flue gas generating power plant |
| CN110856800A (en) * | 2018-08-22 | 2020-03-03 | 江苏凯亚环保科技有限公司 | High-temperature denitration system for selective catalytic reduction |
| CN116498945A (en) * | 2023-05-16 | 2023-07-28 | 中国船舶集团有限公司第七〇三研究所 | Novel 60 ten thousand tons/year propane dehydrogenation technology waste heat recovery device |
-
2013
- 2013-01-24 CN CN 201320038928 patent/CN203043817U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953918A (en) * | 2014-04-28 | 2014-07-30 | 首钢京唐钢铁联合有限责任公司 | Oxygen-enriched combustion system and process for coal gas-pulverized coal mixed combustion power station boiler |
| CN103953918B (en) * | 2014-04-28 | 2017-01-18 | 首钢京唐钢铁联合有限责任公司 | Oxygen-enriched combustion system for coal gas-pulverized coal mixed combustion power station boiler |
| CN104896459A (en) * | 2015-06-26 | 2015-09-09 | 安徽皖苏电力运检科技有限公司 | Full cold-state starting system without auxiliary steam source for supercritical generating unit |
| CN106994302A (en) * | 2017-05-03 | 2017-08-01 | 江苏天楹环保能源成套设备有限公司 | A kind of new and effective SCR denitration system |
| CN107158912A (en) * | 2017-05-09 | 2017-09-15 | 东莞市大能环保科技有限公司 | A kind of high-temperature steam is atomized denitrification apparatus |
| EP3560575A1 (en) * | 2018-04-25 | 2019-10-30 | Mitsubishi Hitachi Power Systems Europe GmbH | Flue gas denitrification method and flue-gas denitrification system for performing the method suitable for integration into a flue gas generating power plant |
| WO2019206931A1 (en) * | 2018-04-25 | 2019-10-31 | Mitsubishi Hitachi Power Systems Europe Gmbh | Flue gas denitrification method and flue gas denitrification system suitable for carrying out the method, for integration into a power plant that produces flue gas |
| CN109092018A (en) * | 2018-08-13 | 2018-12-28 | 大同新成新材料股份有限公司 | A kind of flue gas desulfurization and denitration method and device |
| CN109092018B (en) * | 2018-08-13 | 2020-06-05 | 大同新成新材料股份有限公司 | Flue gas desulfurization and denitrification device |
| CN110856800A (en) * | 2018-08-22 | 2020-03-03 | 江苏凯亚环保科技有限公司 | High-temperature denitration system for selective catalytic reduction |
| CN116498945A (en) * | 2023-05-16 | 2023-07-28 | 中国船舶集团有限公司第七〇三研究所 | Novel 60 ten thousand tons/year propane dehydrogenation technology waste heat recovery device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HANGZHOU SEEKING ENVIRONMENTAL PROTECTION TECHONLO Free format text: FORMER OWNER: FU NINGFANG Effective date: 20140228 |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140228 Address after: 310012, room 1506, C, Zijin Plaza, 701 Pier Road, Hangzhou, Zhejiang, Xihu District Patentee after: HANGZHOU SEEKING ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address before: Hangzhou City, Zhejiang province 310012 Xihu District osmanthus 10 apartment block B Room 101 Patentee before: Fu Ningfang |
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| CX01 | Expiry of patent term |
Granted publication date: 20130710 |
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| CX01 | Expiry of patent term |