CN104941446A - Ammonia spraying grating anti-blocking device for SCR denitration system - Google Patents
Ammonia spraying grating anti-blocking device for SCR denitration system Download PDFInfo
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- CN104941446A CN104941446A CN201510406995.6A CN201510406995A CN104941446A CN 104941446 A CN104941446 A CN 104941446A CN 201510406995 A CN201510406995 A CN 201510406995A CN 104941446 A CN104941446 A CN 104941446A
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- scr denitration
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Abstract
The invention provides an ammonia spraying grating anti-blocking device for an SCR denitration system. The ammonia spraying grating anti-blocking device for the SCR denitration system can effectively solve the problem of spraying port blocking and guarantee the effective and stable operation of the system. The ammonia spraying grating anti-blocking device for the SCR denitration system comprises a denitration reactor inlet flue, an SCR denitration reactor is connected with the denitration reactor inlet flue, an ammonia spraying grating is arranged in the denitration reactor inlet flue, and an ammonia storage tank is connected with the ammonia spraying grating through an ammonia evaporator and a mixer in sequence. The ammonia spraying grating anti-blocking device for the SCR denitration system is characterized in that an ammonia dilution fan is connected with the mixer through a heater.
Description
Technical field
The present invention relates to the technical field of denitrating flue gas, be specially a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system.
Background technology
Selective catalytic reduction (SCR) denitration technology has the advantages such as high, selective good, the stable and reliable operation of efficiency, is used widely at home.The principle of SCR denitrating flue gas is under catalyst action, sprays into, containing ammonia air, NOx is reduced to nitrogen and water, effectively prevent the secondary pollution caused environment in flue gas.
Because sulphur flammable in boiler oil coal is easily oxidized to SO in combustion
2, the wherein SO of about 0.5% ~ 2%
2be oxidized to SO further
3, the steam in flue gas, SO
3can react generation ammonium hydrogen sulfate under certain condition with ammonia, it initially generates temperature is SO
3with the function of ammonia density.SO in flue gas
3larger with ammonia density, initial generation temperature is higher, and the growing amount of ammonium hydrogen sulfate is comparatively large, and the dew point of ammonium hydrogen sulfate is 147 DEG C, and it is assembled at body surface in liquid form or is scattered in flue gas with drops.Liquid ammonium hydrogen sulfate is the very strong and material had compared with severe corrosive of a kind of viscosity, can cause blocking and the corrosion of equipment.
Existing ammonia-gas spraying device generally adopts grating type to design, it is made up of grid pipeline arranged together, each grid pipeline evenly connects multiple spray ammonia smaller branch pipe, by 2 or 4 spouts that smaller branch pipe is evenly split, realize being uniformly distributed of ammonia on flue cross section, nozzle diameter is about 4 ~ 6mm.Existing ammonia dilution elegance normal temperature air, when after mixing with ammonia, in flue, ammonia-spraying grid sprays, containing ammonia air themperature probably at about 80 DEG C, ammonia-spraying grid nozzle ammonia content reaches as high as 5% simultaneously, therefore nozzle very easily generates ammonium hydrogen sulfate, and adhesion flying dust is deposited on spray ammonia mouth, and the spout causing diameter very little blocks, thus cause the inequality of spraying ammonia distribution, affect the normal operation of SCR denitration system.
Summary of the invention
For the problems referred to above, the invention provides a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system, this device can effectively solve spout blockage problem, ensures the effective stable operation of system.
Its technical scheme is such: a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system, it comprises denitration reactor inlet flue, SCR denitration reactor connects described denitration reactor inlet flue, ammonia-spraying grid is provided with in described denitration reactor inlet flue, ammonia storage tank connects described ammonia-spraying grid by ammonia evaporator, blender successively, it is characterized in that: ammonia dilution air connects described blender by heater.
It is further characterized in that: described heater is arranged in described denitration reactor inlet flue, described heater is arranged on described ammonia-spraying grid front end, and flue gas stream passes through described heater, described ammonia-spraying grid successively in described denitration reactor inlet flue; Described ammonia-spraying grid is horizontally disposed;
Described heater comprises heating tube, and described heating tube two ends are respectively arranged with high temperature air header and Cryogenic air header; Described heating tube is one-sided or the tube bank of many sides plug-in type; The design of described tube bank U-shaped or L-type single loop pipe group, described high temperature air header and described Cryogenic air header are connected described single loop pipe group two ends respectively.
In said structure of the present invention, because ammonia storage tank connects ammonia-spraying grid by ammonia evaporator, blender successively, ammonia dilution air connects blender by heater, the outlet air of ammonia dilution air mixes with ammonia in a mixer after heating, owing to containing the dew point of ammonia air themperature higher than ammonium hydrogen sulfate, effectively prevent liquid ammonium hydrogen sulfate deposition and adhesion flying dust and the spout that blocks on ammonia-spraying grid, solve spout blockage problem, ensure the effective stable operation of system.
Accompanying drawing explanation
Fig. 1 is the structural representation of ammonia-spraying grid anti-block apparatus of the present invention;
Fig. 2 is heater one structural representation;
Fig. 3 is heater two structural representation.
Detailed description of the invention
See Fig. 1, a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system, it comprises denitration reactor inlet flue 1, SCR denitration reactor 2 connects denitration reactor inlet flue 1, ammonia-spraying grid 3 is provided with in denitration reactor inlet flue 1, ammonia-spraying grid 3 is horizontally disposed, and ammonia storage tank 4 connects ammonia-spraying grid 3 by ammonia evaporator 5, blender 6 successively, and ammonia dilution air 7 connects blender 6 by heater 8.
Heater 8 is arranged in denitration reactor inlet flue 1, heater 8 is arranged on ammonia-spraying grid 3 front end, flue gas stream is successively by heater 8, ammonia-spraying grid 3 in denitration reactor inlet flue 1, and high-temperature flue gas provides thermal source to heater, has effectively saved energy consumption.
See Fig. 2, Fig. 3, heater 8 comprises heating tube 9, heating tube 9 is one-sided or many sides plug-in type is U-shaped or L-type tube bank 9a, 9b, tube bank is design in single loop pipe group, single loop pipe group two ends are respectively arranged with high temperature air header 10 and Cryogenic air header 11, the air that ammonia dilution air produces is entered in heating tube after being assembled by Cryogenic air header and heats, air after heating is assembled to enter in blender by high temperature air header and is mixed with ammonia, improve the temperature containing ammonia air, the gathering that high temperature air header and Cryogenic air header are conducive to air is set at U-shaped or L-type single loop pipe group two ends, improve the stability that heater runs.
Below in conjunction with accompanying drawing, operation principle of the present invention is described:
The air that ammonia dilution air 7 produces enters in heater 8, high-temperature flue gas is by heater 8 simultaneously, thermal source is provided to heater, heater 8 comprises heating tube 9, two ends are provided with high temperature air header 10 and Cryogenic air header 11, pipe medium is dilution air, air is by after heater 8 and about flue gas in flue heat exchange to 200 DEG C, the ammonia Hybrid Heating ammonia that the high temperature air produced after heating evaporates with evaporimeter 5 in blender 6, high temperature ammonia is sprayed by ammonia-spraying grid 3, achieve the denitration of flue gas, due to higher containing ammonia air themperature, avoid the generation of ammonium hydrogen sulfate, effectively prevent the spout that ammonium hydrogen sulfate and dust adhesion deposit and block on ammonia-spraying grid, effective solution spout blockage problem, the effective stable operation of guarantee system.
Claims (6)
1. the ammonia-spraying grid anti-block apparatus for SCR denitration system, it comprises denitration reactor inlet flue, SCR denitration reactor connects described denitration reactor inlet flue, ammonia-spraying grid is provided with in described denitration reactor inlet flue, ammonia storage tank connects described ammonia-spraying grid by ammonia evaporator, blender successively, it is characterized in that: ammonia dilution air connects described blender by heater.
2. a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system according to claim 1, it is characterized in that: described heater is arranged in described denitration reactor inlet flue, described heater is arranged on described ammonia-spraying grid front end, and flue gas stream passes through described heater, described ammonia-spraying grid successively in described denitration reactor inlet flue.
3. a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system according to claim 1, is characterized in that: described ammonia-spraying grid is horizontally disposed.
4. a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system according to claim 1, it is characterized in that: described heater comprises heating tube, described heating tube two ends are respectively arranged with high temperature air header and Cryogenic air header.
5. a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system according to claim 4, is characterized in that: described heating tube is one-sided or the tube bank of many sides plug-in type.
6. a kind of ammonia-spraying grid anti-block apparatus for SCR denitration system according to claim 5, it is characterized in that: the design of described tube bank U-shaped or L-type single loop pipe group, described high temperature air header and described Cryogenic air header are connected described single loop pipe group two ends respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510406995.6A CN104941446B (en) | 2015-07-13 | 2015-07-13 | A kind of ammonia-spraying grid anti-block apparatus for SCR denitration system |
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|---|---|---|---|
| CN201510406995.6A CN104941446B (en) | 2015-07-13 | 2015-07-13 | A kind of ammonia-spraying grid anti-block apparatus for SCR denitration system |
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| CN104941446A true CN104941446A (en) | 2015-09-30 |
| CN104941446B CN104941446B (en) | 2017-09-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105477938A (en) * | 2016-01-21 | 2016-04-13 | 福建龙净环保股份有限公司 | Two-stage inertial separation pre-dust-collection device in front of SCR denitration system |
| CN107497297A (en) * | 2016-12-29 | 2017-12-22 | 大唐环境产业集团股份有限公司 | A kind of denitration dilution wind heat-exchange system |
| CN109966899A (en) * | 2019-05-07 | 2019-07-05 | 华能国际电力股份有限公司 | Trough mixer device for realizing efficient SNCR (selective non-catalytic reduction) denitration of flue gas of pulverized coal fired boiler |
| CN111068485A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | Method for preventing denitration catalyst from being blocked |
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| JPS6344924A (en) * | 1986-08-11 | 1988-02-25 | Takuma Co Ltd | Denitration treatment of exhaust gas |
| US20070231232A1 (en) * | 2000-12-01 | 2007-10-04 | Fuel Tech, Inc. | SELECTIVE CATALYTIC REDUCTION OF NOx ENABLED BY UREA DECOMPOSITION IN HEAT-EXCHANGER BYPASS |
| CN102614758A (en) * | 2012-04-20 | 2012-08-01 | 湖南安普诺环保科技有限公司 | Urea-solution-based SCR (selective catalytic reduction) flue gas denitration process and device |
| CN202860406U (en) * | 2012-08-06 | 2013-04-10 | 浙江海亮环境材料有限公司 | SCR flue gas denitrating device for glass kiln |
| CN204202445U (en) * | 2014-09-05 | 2015-03-11 | 常熟市佳泰金属材料有限公司 | A kind of tube bank Easy dismountable U-shaped heat exchange of heat pipe |
| CN204352758U (en) * | 2014-12-12 | 2015-05-27 | 成都创客之家科技有限公司 | Be with temperature controlled SCR denitration reaction system |
| CN204768279U (en) * | 2015-07-13 | 2015-11-18 | 无锡华光新动力环保科技股份有限公司 | A ammonia injection grid prevents stifled device for SCR deNOx systems |
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2015
- 2015-07-13 CN CN201510406995.6A patent/CN104941446B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6344924A (en) * | 1986-08-11 | 1988-02-25 | Takuma Co Ltd | Denitration treatment of exhaust gas |
| US20070231232A1 (en) * | 2000-12-01 | 2007-10-04 | Fuel Tech, Inc. | SELECTIVE CATALYTIC REDUCTION OF NOx ENABLED BY UREA DECOMPOSITION IN HEAT-EXCHANGER BYPASS |
| CN102614758A (en) * | 2012-04-20 | 2012-08-01 | 湖南安普诺环保科技有限公司 | Urea-solution-based SCR (selective catalytic reduction) flue gas denitration process and device |
| CN202860406U (en) * | 2012-08-06 | 2013-04-10 | 浙江海亮环境材料有限公司 | SCR flue gas denitrating device for glass kiln |
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| CN204352758U (en) * | 2014-12-12 | 2015-05-27 | 成都创客之家科技有限公司 | Be with temperature controlled SCR denitration reaction system |
| CN204768279U (en) * | 2015-07-13 | 2015-11-18 | 无锡华光新动力环保科技股份有限公司 | A ammonia injection grid prevents stifled device for SCR deNOx systems |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105477938A (en) * | 2016-01-21 | 2016-04-13 | 福建龙净环保股份有限公司 | Two-stage inertial separation pre-dust-collection device in front of SCR denitration system |
| CN107497297A (en) * | 2016-12-29 | 2017-12-22 | 大唐环境产业集团股份有限公司 | A kind of denitration dilution wind heat-exchange system |
| CN109966899A (en) * | 2019-05-07 | 2019-07-05 | 华能国际电力股份有限公司 | Trough mixer device for realizing efficient SNCR (selective non-catalytic reduction) denitration of flue gas of pulverized coal fired boiler |
| CN109966899B (en) * | 2019-05-07 | 2024-01-26 | 华能国际电力股份有限公司 | Groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas |
| CN111068485A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | Method for preventing denitration catalyst from being blocked |
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|---|---|
| CN104941446B (en) | 2017-09-01 |
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Effective date of registration: 20220927 Address after: 3 / F, 406 Jinhua North Road, Xincheng District, Xi'an, Shaanxi 710000 Patentee after: Huaguang Environmental Energy (Xi'an) Design and Research Institute Co.,Ltd. Address before: No. 123, Meiyu Road, New District, Wuxi City, Jiangsu Province Patentee before: WUXI HUAGUANG NEW POWER ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |