CN203075835U - Accident spraying system for preventing SCR (Selective Catalytic Reduction) denitration catalyst from overheating - Google Patents
Accident spraying system for preventing SCR (Selective Catalytic Reduction) denitration catalyst from overheating Download PDFInfo
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- CN203075835U CN203075835U CN 201320038786 CN201320038786U CN203075835U CN 203075835 U CN203075835 U CN 203075835U CN 201320038786 CN201320038786 CN 201320038786 CN 201320038786 U CN201320038786 U CN 201320038786U CN 203075835 U CN203075835 U CN 203075835U
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- ammonia
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Abstract
The utility model discloses an accident spraying system for preventing an SCR (Selective Catalytic Reduction) denitration catalyst from overheating. The accident spraying system is characterized in that a hearth outlet is sequentially connected with a horizontal flue and a coal economizer; the inlet of an SCR reactor is connected with the coal economizer through a flue gas access pipe, a guide plate, an ammonia spraying grating, a temperature reducing water spraying grating and a static mixer are sequentially distributed in the flue gas access pipe; a steam turbine steam pipeline is sequentially connected with a steam header, a steam baffle plate, a steam pipeline of a heat exchanger and a condenser; and a process water pipeline is sequentially connected with the heat exchanger, a valve and the temperature reducing water spraying grating, and a steam trap is connected with the heat exchanger; and the lower part of the SCR reactor is connected with an electrostatic precipitator through a flue gas output pipe, and the electrostatic precipitator is connected with the outlet of the SCR reactor through the flue gas output pipe. The accident spraying system for preventing the SCR (Selective Catalytic Reduction) denitration catalyst from overheating is arranged on the upstream location of the denitration catalyst and a downstream location next to the ammonia spraying grating to prevent the denitration catalyst from being sintered at high temperature and ensure the safety of the denitration catalyst.
Description
Technical field
The utility model belongs to SCR catalyst for denitrating flue gas technology.By the accident spray system that prevents SCR denitrating catalyst overtemperature being installed, prevent the overtemperature sintering of denitrating catalyst in the upstream of denitrating catalyst, the downstream of next-door neighbour's ammonia-spraying grid.
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 was too high, sintering can take place in catalyst, caused the part or all of catalytic activity forfeiture of catalyst, if sintering is serious, needed to change whole catalyst, lost huge.For fear of the overtemperature sintering of denitrating catalyst,, can influence the operational efficiency and the normal operation of boiler like this in case when the flue-gas temperature overtemperature occurring, boiler needs load down operation immediately.
Summary of the invention
The purpose that the utility model proposes is at the deficiencies in the prior art, and a kind of accident spray system of the SCR of preventing denitrating catalyst overtemperature is provided.
The purpose of this utility model is achieved through the following technical solutions: a kind of accident spray system that prevents SCR denitrating catalyst overtemperature, and it comprises: the flue gas access tube, deflector, ammonia-spraying grid, static mixer, the 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, desuperheating water sprays grid, steam-turbine lead, steam header, steam baffle, heat exchanger, condenser, the fresh water (FW) pipeline, steam trap, valve; Wherein, described furnace outlet is connected with economizer with horizontal flue successively.The inlet 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, desuperheating water spray grid, static mixer; Steam-turbine lead links to each other with the steam pipework and the condenser of steam header, steam baffle, heat exchanger successively; The fresh water (FW) pipeline links to each other with heat exchanger, valve and desuperheating water injection valve successively, and steam trap links to each other with heat exchanger.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 inlet 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 inlet 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.
Description of drawings
Fig. 1 is the structural representation that the utility model prevents the accident spray system of SCR denitrating catalyst overtemperature;
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, desuperheating water sprays grid 27, steam-turbine lead 28, steam header 29, steam baffle 30, heat exchanger 31, condenser 32, fresh water (FW) pipeline 33, steam trap 34, valve 35.
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 prevents that the accident spray system of SCR denitrating catalyst overtemperature from comprising: 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, desuperheating water sprays grid 27, steam-turbine lead 28, steam header 29, steam baffle 30, heat exchanger 31, condenser 32, fresh water (FW) pipeline 33, steam trap 34, valve 35.Burner hearth 1 outlet is connected with economizer 3 with horizontal flue 2 successively.The inlet 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, two-fluid spray grid 27, static mixer 7; Steam-turbine lead 28 links to each other with the steam pipework and the condenser 32 of steam header 29, steam baffle 30, heat exchanger 31 successively; Fresh water (FW) pipeline 33 sprays grid 27 with heat exchanger 31, valve 35 and desuperheating water successively and links to each other, and steam trap 34 links to each other with heat exchanger 31.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 inlet 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 inlet 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, desuperheating water 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, 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 recording the flue-gas temperature that enters SCR reactor 8 and be higher than the high activity temperature of denitrating catalyst, open fresh water (FW) pipeline 33 immediately, fresh water (FW) is after heat exchanger 31 and next steam to steam turbine steam pipework 28 carry out heat exchange, spray grid 27 by desuperheating water and carry out the fresh water (FW) injection, realize flue gas cool-down, when preventing that flue-gas temperature is too high, sintering can take place in catalyst, causes the part or all of catalytic activity forfeiture of catalyst.Because in boiler running process,,, can influence the operational efficiency and the normal operation of boiler like this in case when the flue-gas temperature overtemperature occurring, boiler needs load down operation immediately for fear of the overtemperature sintering of denitrating catalyst.When the flue-gas temperature that records satisfies the denitrating catalyst normal operating temperature, then can close the fresh water (FW) pipeline.Fresh water (FW) 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. accident spray system that prevents SCR denitrating catalyst overtemperature, 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), desuperheating water sprays grid (27), steam-turbine lead (28), steam header (29), steam baffle (30), heat exchanger (31), condenser (32), fresh water (FW) pipeline (33), steam trap (34), valve (35); Wherein, the inlet 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), desuperheating water spray grid (27), static mixer (7); Steam-turbine lead (28) links to each other with the steam pipework and the condenser (32) of steam header (29), steam baffle (30), heat exchanger (31) successively; Fresh water (FW) pipeline (33) sprays grid (27) with heat exchanger (31), valve (35) and desuperheating water successively and links to each other, and steam trap (34) links to each other with heat exchanger (31); 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 inlet 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 inlet 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320038786 CN203075835U (en) | 2013-01-24 | 2013-01-24 | Accident spraying system for preventing SCR (Selective Catalytic Reduction) denitration catalyst from overheating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320038786 CN203075835U (en) | 2013-01-24 | 2013-01-24 | Accident spraying system for preventing SCR (Selective Catalytic Reduction) denitration catalyst from overheating |
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| Publication Number | Publication Date |
|---|---|
| CN203075835U true CN203075835U (en) | 2013-07-24 |
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| CN 201320038786 Expired - Lifetime CN203075835U (en) | 2013-01-24 | 2013-01-24 | Accident spraying system for preventing SCR (Selective Catalytic Reduction) denitration catalyst from overheating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106492630A (en) * | 2017-01-05 | 2017-03-15 | 浙江友通环境科技有限公司 | A kind of SCR flue gas denitrification systems |
| CN108283888A (en) * | 2018-03-27 | 2018-07-17 | 易能环境技术有限公司 | A kind of equipment for denitrifying flue gas and its method of denitration |
-
2013
- 2013-01-24 CN CN 201320038786 patent/CN203075835U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106492630A (en) * | 2017-01-05 | 2017-03-15 | 浙江友通环境科技有限公司 | A kind of SCR flue gas denitrification systems |
| CN108283888A (en) * | 2018-03-27 | 2018-07-17 | 易能环境技术有限公司 | A kind of equipment for denitrifying flue gas and its method of denitration |
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| Date | Code | Title | Description |
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| 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: 20140213 |
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| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 310014 HANGZHOU, ZHEJIANG PROVINCE TO: 310012 HANGZHOU, ZHEJIANG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20140213 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: 310014 room 2, 1606 New Youth Plaza, Hangzhou, Zhejiang, Gongshu District Patentee before: Zhejiang Xiner Science & Technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130724 |
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| CX01 | Expiry of patent term |