CN204678324U - A kind of low nitrogen burning transformation method reduces the device of boiler smoke NOx - Google Patents
A kind of low nitrogen burning transformation method reduces the device of boiler smoke NOx Download PDFInfo
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- CN204678324U CN204678324U CN201520375836.XU CN201520375836U CN204678324U CN 204678324 U CN204678324 U CN 204678324U CN 201520375836 U CN201520375836 U CN 201520375836U CN 204678324 U CN204678324 U CN 204678324U
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- air
- pipeline
- boiler
- flue gas
- secondary air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses the device that a kind of low nitrogen burning transformation method reduces boiler smoke NOx, comprise the boiler, cyclone separator, economizer, deduster, air-introduced machine and the chimney that are connected successively, the middle part of boiler and bottom are connected to First air pipeline and Secondary Air pipeline, the porch of First air pipeline and Secondary Air pipeline is respectively equipped with primary air fan and overfire air fan, a flue gas recirculation flue is drawn in the exit that air-introduced machine is connected with chimney, and the other end of flue gas recirculation flue is connected in parallel to the porch of primary air fan; The stage casing of First air pipeline and Secondary Air pipeline is respectively equipped with air preheater, First air pipeline locates extraction First air stepped pipeline through the outlet header of air preheater, and the other end of First air stepped pipeline is connected in parallel to Secondary Air pipeline through the outlet header of air preheater and locates.This reduction boiler smoke NOx device only need install two pipelines additional on the basis of existing equipment, have cost of investment low, transform advantage quick, simple to operate.
Description
Technical field
The utility model relates to a kind of equipment reducing boiler smoke NOx, and particularly a kind of low nitrogen burning transformation method reduces the device of boiler smoke NOx.
Background technology
Existing boiler many employings coal is as fuel, and coal can produce a large amount of nitrogen oxide NOx in the process of burning.There is strict requirement in country to the exert oneself discharge of 65t/h and above boiler smoke of separate unit, and must reach " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011), wherein the discharge standard of nitrogen oxide is NOx≤100mg/m
3, but the concentration of emission of current most of boiler smoke all exceedes above-mentioned standard.
Therefore, in order to make boiler smoke NOx concentration reach state emission standard, need to control the discharge of boiler smoke NOx, administer.The technical measures controlling NOx emission are generally divided into two large classes, one class is process control, its key is the reaction of formation of NOx in control combustion process, and this technology realizes often through devices such as low NO, Researched of Air Staging Combustion Burning Pulverized Coal device, fuel-staged combustion device, air/fuel classification low NOs; Another kind of is End-Management, and its key is by being reduced to N the NOx generated
2, this technology sprays into reducing agent by installing the device such as spray gun or feeder in the duct additional, though this type of denitrification apparatus has higher denitration efficiency, its shortcoming is that investment cost is large, and operating cost is high.
Summary of the invention
The utility model provides the device that a kind of low nitrogen burning with low cost, simple to operate transformation method reduces boiler smoke NOx.
For achieving the above object, the technical solution of the utility model is:
A kind of low nitrogen burning transformation method reduces the device of flue gas NOx, comprise the boiler, cyclone separator, economizer, deduster, air-introduced machine and the chimney that are connected successively, the main combustion zone of described boiler and again combustion zone are connected to First air pipeline and Secondary Air pipeline, the porch of First air pipeline and Secondary Air pipeline is respectively equipped with primary air fan and overfire air fan, it is characterized in that:
A flue gas recirculation flue is drawn in the exit that described air-introduced machine is connected with chimney, and the other end of flue gas recirculation flue is connected in parallel to the porch of primary air fan, flue gas recirculation flue is provided with reuse flue gas air door;
The stage casing of described First air pipeline and Secondary Air pipeline is respectively equipped with air preheater, First air pipeline locates extraction First air stepped pipeline through the outlet header of air preheater, the other end of First air stepped pipeline is connected in parallel to Secondary Air pipeline through the outlet header of air preheater and locates, and First air stepped pipeline is provided with First air classification air door.
Described Secondary Air pipeline is connected to boiler secondary air tube inlet through the outlet header of air preheater, and junction is divided into Secondary Air inlet tube and lower Secondary Air inlet tube.
Anticorrosion insulating layer is provided with outside described flue gas recirculation flue and First air stepped pipeline.
Above structure low nitrogen burning transformation method reduces the device of boiler smoke NOx, NOx discharge is reduced: partial fume is introduced in First air pipeline by flue gas recirculation flue by (1) by introducing two pipelines, thus control the oxygen content gas of economizer entrance, reduce boiler main combustion zone NOx generation amount; (2) by First air stepped pipeline, part First air is introduced in Secondary Air pipeline, to reduce the oxygen concentration at boiler combustion center, thus suppress the formation of combustion zone NOx again, in this course, remaining air required for complete combustion of fuel is supplied by the First air being assigned to secondary air channel, make fuel after-flame, in combustion zone again, because air quantity reduces, define the region of relative low temperature, oxygen deprivation and fuel-rich material, burning velocity is low, and the nitrogen major part in fuel is decomposed into HCN, HN, CN, CH etc., NOx can be suppressed to generate for bis-times.
This reduction boiler smoke NOx device only need install two pipelines additional on the basis of existing equipment, have cost of investment low, transform advantage quick, simple to operate, easy to maintenance, and there is the effect that good suppression NOx generates.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure, boiler 1, cyclone separator 2, First air classification air door 3, economizer 4, air preheater 5, deduster 6, overfire air fan 7, primary air fan 8, First air pipeline 9, primary air fan air door 10, Secondary Air pipeline 11, overfire air fan air door 12, reuse flue gas wind air door 13, air-introduced machine 14, chimney 15, flue gas recirculation flue 16, First air stepped pipeline 17.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, it is structural representation of the present utility model, comprise the boiler 1, cyclone separator 2, economizer 4, deduster 6, air-introduced machine 14 and the chimney 15 that are connected successively, the middle part of described boiler 1 and bottom are connected to First air pipeline 9 and Secondary Air pipeline 11, the porch of First air pipeline 9 and Secondary Air pipeline 11 is respectively equipped with primary air fan 8 and overfire air fan 7, primary air fan 8 is provided with First air air door 10 with the junction of First air pipeline 9, and the junction of overfire air fan 7 and Secondary Air pipeline is provided with overfire air fan air door 12.A flue gas recirculation flue 16 is drawn in the exit that air-introduced machine 14 is connected with chimney 15, and the other end of flue gas recirculation flue 16 is connected in parallel to the porch of primary air fan 8; Flue gas recirculation flue 16 is provided with reuse flue gas air door 13; The stage casing of First air pipeline 9 and Secondary Air pipeline 11 is respectively equipped with air preheater 5, First air pipeline 9 locates extraction First air stepped pipeline 17 through the outlet header of air preheater 5, the other end of First air stepped pipeline 17 is connected in parallel to Secondary Air pipeline 11 through the outlet header of air preheater 5 and locates, and First air stepped pipeline 17 is provided with First air classification air door 3.
Further, Secondary Air pipeline 11 is connected to boiler secondary air tube inlet through the outlet header of air preheater 5, and junction is divided into Secondary Air inlet tube and lower Secondary Air inlet tube.
Further, anticorrosion insulating layer is provided with outside flue gas recirculation flue 16 and First air stepped pipeline 17.
The operating process of above-mentioned reduction boiler smoke NOx device is:
1, according to the change of boiler combustion flue gas oxygen content and emission of NOx of boiler concentration value, by the aperture ratio of control and regulation reuse flue gas air door 13, primary air fan air door 10, regulate the exhaust gas volumn introduced by flue gas recirculation flue 16, thus control boiler makes coal dust firing carry out under close to the condition of theoretical air requirement as far as possible, reduces NOx generation amount.
2, by regulating First air classification air door 3 aperture ratio, part First air 9 being delivered to boiler secondary air 11 airduct entrance by First air stepped pipeline 17, to increase secondary air flow, reduces blasting of primary air flow, improve Researched of Air Staging Combustion Burning Pulverized Coal dynamics; By reducing the oxygen concentration at boiler combustion center, thus suppress the formation of combustion zone NOx again, in this course, the remaining air required for complete combustion of fuel is supplied by the First air being assigned to Secondary Air pipeline 11, makes fuel after-flame, in combustion zone again, because air quantity reduces, define the region of relative low temperature, oxygen deprivation and fuel-rich material, burning velocity is low, and the nitrogen major part in fuel is decomposed into HCN, HN, CN, CH etc., NOx can be suppressed to generate for bis-times.
By adopting this reduction boiler smoke NOx device, following effect can be reached:
1, by Control for Oxygen Content 1.5 ~ 2.5%, excess air coefficient when burning can be lowered;
2, NOx concentration reduction by more than 40% compared with before transformation after low nitrogen burning transformation;
3, little on boiler thermal output impact, unburned carbon in flue dust increase is less than or equal to 1%;
4, this technological transformation is less to Influence of production, and the blowing out erection unit time is very short;
5, investment for trnasforming urban land economizes, and administration project operating cost is low;
6, do not need newly-increased operating personnel, all system equipments operate by former boiler attendance work.
Claims (3)
1. the device of a low nitrogen burning transformation method reduction boiler smoke NOx, comprise the boiler, cyclone separator, economizer, deduster, air-introduced machine and the chimney that are connected successively, the main combustion zone of described boiler and again combustion zone are connected to First air pipeline and Secondary Air pipeline, the porch of First air pipeline and Secondary Air pipeline is respectively equipped with primary air fan and overfire air fan, it is characterized in that:
A flue gas recirculation flue (16) is drawn in the exit that described air-introduced machine (14) is connected with chimney (15), the other end of flue gas recirculation flue (16) is connected in parallel to the porch of primary air fan (8), and (16) are provided with reuse flue gas air door (13) to flue gas recirculation flue;
The stage casing of described First air pipeline (9) and Secondary Air pipeline (11) is respectively equipped with air preheater (5), First air pipeline (9) locates extraction First air stepped pipeline (17) through the outlet header of air preheater (5), the other end of First air stepped pipeline (17) is connected in parallel to Secondary Air pipeline (11) through the outlet header of air preheater (5) and locates, and First air stepped pipeline (17) is provided with First air classification air door (3).
2. low nitrogen burning transformation method according to claim 1 reduces the device of boiler smoke NOx, it is characterized in that:
Described Secondary Air pipeline (11) is connected to boiler secondary air tube inlet through the outlet header of air preheater (5), and junction is divided into Secondary Air inlet tube and lower Secondary Air inlet tube.
3. low nitrogen burning transformation method according to claim 1 reduces the device of boiler smoke NOx, it is characterized in that:
Described flue gas recirculation flue (16) and First air stepped pipeline (17) outside are provided with anticorrosion insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520375836.XU CN204678324U (en) | 2015-06-03 | 2015-06-03 | A kind of low nitrogen burning transformation method reduces the device of boiler smoke NOx |
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| CN201520375836.XU CN204678324U (en) | 2015-06-03 | 2015-06-03 | A kind of low nitrogen burning transformation method reduces the device of boiler smoke NOx |
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| CN204678324U true CN204678324U (en) | 2015-09-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588135A (en) * | 2016-02-22 | 2016-05-18 | 大震锅炉工业（昆山）有限公司 | Smoke recirculator for boiler |
| CN106090962A (en) * | 2016-06-29 | 2016-11-09 | 无锡锡能锅炉有限公司 | A kind of coal-burning boiler chimney structure |
| CN108905568A (en) * | 2018-08-20 | 2018-11-30 | 山东省建设高压容器有限公司 | A kind of circulating fluidized bed boiler flue gas desulfuration and denitrification system and its remodeling method |
| CN110296392A (en) * | 2019-07-09 | 2019-10-01 | 重庆富燃科技股份有限公司 | A kind of device and method with heat exchange efficiency after regulation porosu solid fuel combustion temperature and increase burning |
| CN111380049A (en) * | 2019-11-27 | 2020-07-07 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
-
2015
- 2015-06-03 CN CN201520375836.XU patent/CN204678324U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588135A (en) * | 2016-02-22 | 2016-05-18 | 大震锅炉工业（昆山）有限公司 | Smoke recirculator for boiler |
| CN106090962A (en) * | 2016-06-29 | 2016-11-09 | 无锡锡能锅炉有限公司 | A kind of coal-burning boiler chimney structure |
| CN108905568A (en) * | 2018-08-20 | 2018-11-30 | 山东省建设高压容器有限公司 | A kind of circulating fluidized bed boiler flue gas desulfuration and denitrification system and its remodeling method |
| CN110296392A (en) * | 2019-07-09 | 2019-10-01 | 重庆富燃科技股份有限公司 | A kind of device and method with heat exchange efficiency after regulation porosu solid fuel combustion temperature and increase burning |
| CN111380049A (en) * | 2019-11-27 | 2020-07-07 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
| CN111380049B (en) * | 2019-11-27 | 2022-05-27 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20180603 |
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| CF01 | Termination of patent right due to non-payment of annual fee |