CN203002216U - SCR (selective catalytic reduction) flue gas denitration system with preposed two-fluid jet system - Google Patents
SCR (selective catalytic reduction) flue gas denitration system with preposed two-fluid jet system Download PDFInfo
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- CN203002216U CN203002216U CN 201220732451 CN201220732451U CN203002216U CN 203002216 U CN203002216 U CN 203002216U CN 201220732451 CN201220732451 CN 201220732451 CN 201220732451 U CN201220732451 U CN 201220732451U CN 203002216 U CN203002216 U CN 203002216U
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- flue gas
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Abstract
The utility model discloses an SCR (selective catalytic reduction) flue gas denitration system with a preposed two-fluid jet system. After flue gas discharged from a furnace cavity is adequately mixed with a reducing agent ammonia water injected through a horizontal flue, a coal economizer and an ammonia jetted grating, the obtained mixture enters an SCR reactor, a selective catalytic reduction reaction occurs under the action of a catalyst, and the reacted flue gas enters a low-temperature air preheater. According to the utility model, the temperature of flue gas entering the SCR reactor is adjusted through arranging a process water and high-temperature steam two-fluid jet system at the upstream part of the denitration catalyst, so that a situation that the temperature of flue gas in the SCR reactor meets the reaction reactivity temperature of the denitration catalyst is ensured, thereby improving the availability and security of the SCR denitration system.
Description
Technical field
The utility model relates to a kind of SCR flue gas denitrification system with preposition two-fluid jet system, specifically, relate to and a kind ofly regulate at denitrating catalyst upstream mounting process water and high-temperature steam two-fluid jet system the flue-gas temperature that enters the SCR reactor, guarantee that in the SCR reactor, flue-gas temperature satisfies the reactivity temperature of denitrating catalyst, thereby improve the Novel SCR flue gas denitrification system of SCR denitrating system availability and security.
Background technology
The out of stock system of traditional flue gas such as Fig. 2: coal dust generates high-temperature flue gas in burner hearth 1 internal combustion, and high-temperature flue gas passes through horizontal flue 2, economizer 3 successively; SCR reactor 8 is connected with economizer 3 by flue gas access tube 4, arranges successively deflector 5, ammonia-spraying grid 6, static mixer 7 in flue gas access tube 4, and denitrating catalyst 9 is arranged in SCR reactor 8; SCR reactor 8 bottoms are connected with electrostatic precipitator 24 by flue gas efferent duct 23, are provided with air preheater 22 in the flue gas efferent duct 23 between electrostatic precipitator 24 and SCR reactor, gas baffle 19; The air input pipe 20 of described burner hearth 1 is connected through air preheater 22 with blower fan 21; Unload ammonia compressor 15 with the liquefied ammonia step-down and be saved in storage ammonia tank 13, ammonia evaporator 12 will store up the interior ammoniacal liquor evaporation of ammonia tank 13, utilize ammonia fairlead 11 to enter ammonia/air mixer 10; Pressure fan 16 is connected with ammonia/air mixer 10 by air efferent duct 17; Ammonia/air mixer 10 is connected with ammonia-spraying grid 6.The nozzle of ammonia-spraying grid 7 is consistent with the flow of flue gas direction; In the SCR reactor, NO in flue gas
xWith the ammonia of ammonia-spraying grid ejection under the effect of catalyst, selective catalytic reduction reaction occurs, NO
xBe reduced into N
2And H
2O。After after purifying, flue gas enters air preheater 22, electrostatic precipitator 24, FGD desulphurization plant 26 successively, by smoke stack emission.
In conventional scr technique, due to the active reaction temperature of denitrating catalyst at 320-400 ℃, so the denitrating catalyst arrangement is between economizer and air preheater.When boiler load or coal change, often can cause this interval flue-gas temperature to surpass the active reaction temperature range of denitrating catalyst.
When flue-gas temperature was too high, sintering can occur in catalyst, caused the part or all of catalytic activity of catalyst to lose, if sintering is serious, needed to change whole catalyst, lost huge.For fear of the overtemperature sintering of denitrating catalyst, in case when the flue-gas temperature overtemperature occurring, boiler needs load down operation immediately, can affect like this operational efficiency and the normal operation of boiler.
When flue-gas temperature is too low, especially, must in time stop spraying ammonia, otherwise can cause the obstruction of the air preheater in denitrating catalyst and downstream during lower than the minimum spray ammonia temperature of denitrating catalyst when temperature, affect the operation of steam generator system.After denitrating system stops spraying 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 affect security and the availability of denitrating system.
Summary of the invention
The purpose that the utility model proposes is for the deficiencies in the prior art, proposes a kind of SCR flue gas denitrification system with preposition two-fluid jet system.
The purpose of this utility model is achieved through the following technical solutions: a kind of SCR flue gas denitrification system with preposition two-fluid jet system, and it comprises: flue gas access tube, deflector, ammonia-spraying grid, static mixer, SCR reactor, ammonia/air mixer, ammonia evaporator, storage ammonia tank, unload ammonia compressor, pressure fan, slag-blowing equipmemt, gas baffle, hot air duct, blower fan, air preheater, electrostatic precipitator, air-introduced machine, two-fluid and spray grid, three-way valve, fresh water (FW) pipeline, auxiliary vapour header, Boiler Steam pipeline and steam turbine steam pipework; Wherein, described furnace outlet is connected with economizer with horizontal flue successively.The entrance of SCR reactor is connected with economizer by the flue gas access tube, arranges successively in the flue gas access tube that deflector, high-temperature air preheater, ammonia-spraying grid, two-fluid spray grid, static mixer; The Boiler Steam pipeline is connected with auxiliary vapour header respectively with the steam turbine steam pipework; Auxiliary vapour header steam (vapor) outlet sprays grid with the fresh water (FW) pipeline by three-way valve and two-fluid and is connected; 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 successively gas baffle and air preheater in the flue gas efferent duct; Blower fan is connected with burner hearth by the air duct of air preheater; Unload ammonia compressor and be connected with the entrance of storage ammonia tank, ammonia evaporator is connected with storage ammonia tank, is used for ammoniacal liquor in evaporation storage ammonia tank; The outlet of storage ammonia tank is connected with the ammonia entrance of ammonia/air mixer by the ammonia fairlead; Pressure fan is connected with the air intake of ammonia/air mixer by the air efferent duct; The outlet of ammonia/air mixer is connected 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 is connected with air-introduced machine.
The beneficial effects of the utility model are, the utility model is by regulating at denitrating catalyst upstream mounting process water and high-temperature steam two-fluid jet system the flue-gas temperature that enters the SCR reactor, guarantee that in the SCR reactor, flue-gas temperature satisfies the reactivity temperature of denitrating catalyst, thereby improve SCR denitrating system availability and security.
Description of drawings
Fig. 1 is the structural representation that the utlity model has the SCR flue gas denitrification system of preposition two-fluid jet system;
Fig. 2 is traditional SCR flue-gas denitration process flow chart;
in 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 tank 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, two-fluid sprays grid 27, three-way valve 28, fresh water (FW) pipeline 29, auxiliary vapour header 30, Boiler Steam pipeline 31, steam turbine steam pipework 32.
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 flue gas denitrification system of being used for the burning brown coal 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 tank 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, two-fluid and spray grid 27, three-way valve 28, fresh water (FW) pipeline 29, auxiliary vapour header 30, Boiler Steam pipeline 31, steam turbine steam pipework 32.Burner hearth 1 exports to be connected with economizer with horizontal flue 2 successively and is connected.The entrance of SCR reactor 8 is connected with economizer 3 by flue gas access tube 4, arranges successively in flue gas access tube 4 that deflector 5, ammonia-spraying grid 6, two-fluid spray grid 27, static mixer 7; Boiler Steam pipeline 31 is connected with auxiliary vapour header 30 respectively with steam turbine steam pipework 32; Auxiliary vapour header 30 steam (vapor) outlets spray grid 27 with fresh water (FW) pipeline 29 by three-way valve 28 and two-fluid and are connected; 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 successively gas baffle 19 and air preheater 22 in flue gas efferent duct 23; Blower fan 21 is connected with burner hearth 1 by the air duct of air preheater 22 successively; Unload ammonia compressor 15 and be connected with the entrance of storage ammonia tank 13, ammonia evaporator 12 is connected with storage ammonia tank 13, is used for evaporation storage ammonia tank 13 interior ammoniacal liquor; The outlet of storage ammonia tank 13 is connected with the ammonia entrance of ammonia/air mixer 10 by ammonia fairlead 11; Pressure fan 16 is connected with the air intake of ammonia/air mixer 10 by air efferent duct 17; The outlet of ammonia/air mixer 10 is connected 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 is connected with air-introduced machine 25.
The course of work of the present utility model is as follows: after 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 flue gas by ammonia-spraying grid 6; High-temperature flue gas and ammonia enter SCR reactor 8 after mixing in static mixer 7; When recording the flue-gas temperature that enters SCR reactor 8 higher than the high activity temperature of denitrating catalyst, open immediately fresh water (FW) pipeline 29, spray grid 27 by two-fluid and carry out the fresh water (FW) injection, realize flue gas cool-down, when preventing that flue-gas temperature is too high, sintering can occur in catalyst, causes the part or all of catalytic activity of catalyst to lose.Because in boiler running process, for fear of the overtemperature sintering of denitrating catalyst, in case when the flue-gas temperature overtemperature occurring, boiler needs load down operation immediately, can affect like this operational efficiency and the normal operation of boiler.And during lower than the minimum spray ammonia temperature of denitrating catalyst, switch to the high-temperature steam side when the flue-gas temperature that records, spraying grid 27 by two-fluid carries out high-temperature steam and sprays, and improves flue-gas temperature, prevents when the minimum spray ammonia temperature of temperature lower than denitrating catalyst.Because during lower than the minimum spray ammonia temperature of denitrating catalyst, must stop spraying ammonia when flue-gas temperature, avoid the air preheater in denitrating catalyst and downstream to stop up, thereby affect the operation of steam generator system.After denitrating system stops spraying 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, steam and fresh water (FW) Close All.At the boiler startup initial stage, auxiliary steam directly comes to the rear steam that produces of boiler heating, and after the normal operation of boiler, high-temperature steam comes to steam turbine high-pressure cylinder, and fresh water (FW) is the general industry water.In SCR reactor 8, NO in flue gas
xWith the ammonia of ammonia-spraying grid 6 ejections under the effect of catalyst 9, selective catalytic reduction reaction occurs, NO
xBe reduced into N
2And H
2O。After purifying, flue gas enters low-temperature air preheater 22, electrostatic precipitator 24 successively, then sends into follow-up FGD desulphurization plant 26 by air-introduced machine 25 and carry out the desulfurization processing, goes out by smoke stack emission at last.
Claims (1)
1. SCR flue gas denitrification system with preposition two-fluid jet system, burner hearth (1) outlet is connected 3 with horizontal flue (2) with economizer successively) be connected, 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 tank (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), two-fluid sprays grid (27), three-way valve (28), fresh water (FW) pipeline (29), auxiliary vapour header (30), Boiler Steam pipeline (31) and steam turbine steam pipework (32), wherein, the entrance of SCR reactor (8) is connected with economizer (3) by flue gas access tube (4), arranges successively in flue gas access tube (4) that deflector (5), ammonia-spraying grid (6), two-fluid spray grid (27), static mixer (7), Boiler Steam pipeline (31) is connected with auxiliary vapour header (30) respectively with steam turbine steam pipework (32), auxiliary vapour header (30) steam (vapor) outlet sprays grid (27) with fresh water (FW) pipeline (29) by three-way valve (28) and two-fluid and is connected, described SCR reactor (8) bottom is connected with electrostatic precipitator (24) by flue gas efferent duct (23), arranges successively gas baffle (19) and air preheater (22) in flue gas efferent duct (23), blower fan (21) is connected with burner hearth (1) by the air duct of air preheater (22), unload ammonia compressor (15) and be connected with the entrance of storage ammonia tank (13), ammonia evaporator (12) is connected with storage ammonia tank (13), is used for ammoniacal liquor in evaporation storage ammonia tank, the outlet of storage ammonia tank (13) is connected with the ammonia entrance of ammonia/air mixer (10) by ammonia fairlead (11), pressure fan (16) is connected with the air intake of ammonia/air mixer (10) by air efferent duct (17), the outlet of ammonia/air mixer (10) is connected 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) is connected with air-introduced machine (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220732451 CN203002216U (en) | 2012-12-27 | 2012-12-27 | SCR (selective catalytic reduction) flue gas denitration system with preposed two-fluid jet system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220732451 CN203002216U (en) | 2012-12-27 | 2012-12-27 | SCR (selective catalytic reduction) flue gas denitration system with preposed two-fluid jet system |
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| CN203002216U true CN203002216U (en) | 2013-06-19 |
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|---|---|---|---|
| CN 201220732451 Expired - Fee Related CN203002216U (en) | 2012-12-27 | 2012-12-27 | SCR (selective catalytic reduction) flue gas denitration system with preposed two-fluid jet system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103055696A (en) * | 2012-12-27 | 2013-04-24 | 浙江信耳科技有限公司 | A SCR flue gas denitrification system having a pre-positioned dual fluid injection system |
| CN106145159A (en) * | 2015-04-21 | 2016-11-23 | 中材装备集团有限公司 | A kind of cement plant SCR denitration ammonia prepares ammonia system and method |
| CN108993136A (en) * | 2018-08-13 | 2018-12-14 | 丁文铃 | A kind of efficiency of waste gas denitrification apparatus |
-
2012
- 2012-12-27 CN CN 201220732451 patent/CN203002216U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103055696A (en) * | 2012-12-27 | 2013-04-24 | 浙江信耳科技有限公司 | A SCR flue gas denitrification system having a pre-positioned dual fluid injection system |
| CN106145159A (en) * | 2015-04-21 | 2016-11-23 | 中材装备集团有限公司 | A kind of cement plant SCR denitration ammonia prepares ammonia system and method |
| CN108993136A (en) * | 2018-08-13 | 2018-12-14 | 丁文铃 | A kind of efficiency of waste gas denitrification apparatus |
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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: ZHEJIANG XINER SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20140129 |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 310014 HANGZHOU, ZHEJIANG PROVINCE TO: 310012 HANGZHOU, ZHEJIANG PROVINCE |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140129 Address after: 310012, room 1506, C, Zijin Plaza, 701 Pier Road, Hangzhou, Zhejiang, Xihu District Patentee after: Hangzhou Seeking Environmental Protection Techonlogy Co., Ltd. Address before: 310014 room 2, 1606 New Youth Plaza, Hangzhou, Zhejiang, Gongshu District Patentee before: Zhejiang Xiner Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20201227 |