CN204534555U - A kind of flue gas recirculation device for reducing NO_x formation - Google Patents
A kind of flue gas recirculation device for reducing NO_x formation Download PDFInfo
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- CN204534555U CN204534555U CN201520039716.2U CN201520039716U CN204534555U CN 204534555 U CN204534555 U CN 204534555U CN 201520039716 U CN201520039716 U CN 201520039716U CN 204534555 U CN204534555 U CN 204534555U
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- flue gas
- gas recirculation
- flue
- duct
- primary air
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- 239000003546 flue gas Substances 0.000 title claims abstract description 89
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 10
- 239000000779 smoke Substances 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000003245 coal Substances 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical class N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 241000707825 Argyrosomus regius Species 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
Abstract
The utility model relates to a kind of flue gas recirculation device for reducing NO_x formation, comprise by the primary air fan inlet duct be connected in series, primary air fan, the primary air system that First air air supply duct and primary wind and powder outlet are formed, comprise the steam generator system be made up of boiler and back-end ductwork, comprise and being communicated with the back-end ductwork of steam generator system, by smoke discharging pipe, electric dust collector, the smoke evacuation system that flue gases duct and air-introduced machine are formed, be connected with between flue gases duct and primary air fan inlet duct by flue gas recirculation gas approach, the flue gas recirculation device that flue gas blower fan and flue gas recirculation exhaust pass connect and compose successively.Flue gas after afterbody dedusting can be sent into First air through recirculation by the utility model, enters burner hearth as pulverized coal preparation system carrier wind, is conducive to reducing lower hearth oxygen amount and temperature, reduces the generation of nitrogen oxide, reduce environment protection emission pressure.
Description
Technical field
The utility model belongs to Industrial Boiler Technology field, particularly relates to two yardstick burning low NO boiler, boiler tail flue gas EGR, flue gas system, particularly a kind of flue gas recirculation device for reducing NO_x formation.
Background technology
Take the boiler of low NO at present, mainly utilize air staged combustion technology, in first-stage burning district, main combustion zone, make excess air coefficient α < 1, in reducing atmosphere, reduce the reactivity generating NOx, inhibit NOx at this aflame growing amount.In order to complete whole combustion process, the required remaining air that burns completely then sends into burner hearth by the dedicated air spout be arranged in above main burner, the flue gas produced under " combustion with meagre oxygen " condition with first-stage burning district mixes, and completes whole combustion process under the condition of α > 1.
The improved boiler of partial combustion device, owing to mixing the reason of burning or electrical load requirement, it is more that coal pulverizer runs number of units, the coal-air ratio of pulverized coal preparation system is larger, cause oxygen amount in burner hearth sufficient, formation of nitrogen oxides is multiplied, reducing agent is caused to drop in a large number, but low load stage flue-gas temperature is lower, excessive reducing agent can cause again the place such as air preheater, electric precipitation to form ammonia salt, reheating temperature parameter is on the low side simultaneously, therefore how to control the oxygen amount of boiler during underload, has become reduction nitrogen oxide urgent problem.
Summary of the invention
The purpose of this utility model is to solve the deficiencies in the prior art, and proposes a kind of flue gas recirculation device for reducing NO_x formation.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of flue gas recirculation device for reducing NO_x formation, comprise by the primary air fan inlet duct be connected in series, primary air fan, the primary air system that First air air supply duct and primary wind and powder outlet are formed, comprise the steam generator system be made up of boiler and back-end ductwork, comprise and being communicated with the back-end ductwork of steam generator system, by smoke discharging pipe, electric dust collector, the smoke evacuation system that flue gases duct and air-introduced machine are formed, be connected with between flue gases duct and primary air fan inlet duct by flue gas recirculation gas approach, the flue gas recirculation device that flue gas blower fan and flue gas recirculation exhaust pass connect and compose successively.
And, described flue gas recirculation gas approach comprises the identical flue gas recirculation entrance branch pipe(tube) of two line structures further, one end of two-way flue gas recirculation entrance branch pipe(tube) is communicated with affixed respectively by flue entrance regulating fender, flue entrance with flue gases duct after cutting off baffle plate and flue access flange, the other end of two-way flue gas recirculation entrance branch pipe(tube) is connected with flue gas fans entrance pipeline by after entrance threeway tandem.
And, described flue gas recirculation exhaust pass comprises flue gas recirculation further and exports female flue, one end that flue gas recirculation exports female flue is connected with the outlet of flue gas blower fan, the other end connects two-way flue gas recirculation outlet branch flue by outlet threeway, and the other end of two-way flue gas recirculation outlet branch flue is connected with primary air fan inlet duct respectively by after flue gas recirculation outlet branch flue regulating fender and exhanst gas outlet adpting flange.
Advantage of the present utility model and good effect are:
According to boiler tail flue gas EGR of the present utility model, flue gas after afterbody dedusting can be sent into First air through recirculation, enter burner hearth as pulverized coal preparation system carrier wind, be conducive to reducing lower hearth oxygen amount and temperature, reduce the generation of nitrogen oxide, reduce environment protection emission pressure.Simultaneously effectively reduce the boiler at low load stage, due to by mixing burnings, the impact of load scheduling cause coal pulverizer to run number of units is more, oxygen amount abundance in stove, boiler export nitrogen oxide are higher and reheating temperature brought problem on the low side.
Accompanying drawing explanation
Fig. 1 is the structural representation of boiler flue gas recirculation device;
Fig. 2 is that boiler flue gas recirculation device specifically implements structural representation.
Detailed description of the invention
Implement to be further described to the utility model below in conjunction with accompanying drawing, following examples are descriptive, are not determinate, can not limit protection domain of the present utility model with this.
A kind of flue gas recirculation device for reducing NO_x formation, as shown in Figure 1, comprise by the primary air fan inlet duct 11 be connected in series, primary air fan 12, the primary air system that First air air supply duct 13 and primary wind and powder outlet 1 are formed, comprise the steam generator system be made up of boiler 2 and back-end ductwork 3, comprise and being communicated with the back-end ductwork of steam generator system, by smoke discharging pipe 4, electric dust collector 5, the smoke evacuation system that flue gases duct 6 and air-introduced machine 7 are formed, innovative point of the present utility model is, be connected with between flue gases duct and primary air fan inlet duct by flue gas recirculation gas approach 8, the flue gas recirculation device that flue gas blower fan 9 and flue gas recirculation exhaust pass 10 connect and compose successively.
In concrete enforcement of the present utility model, as shown in Figure 2, described flue gas recirculation gas approach comprises the identical flue gas recirculation entrance branch pipe(tube) 21 of two line structures further, one end of two-way flue gas recirculation entrance branch pipe(tube) is communicated with affixed respectively by flue entrance regulating fender 20, flue entrance with flue gases duct after cutting off baffle plate 19 and flue access flange 18, the other end of two-way flue gas recirculation entrance branch pipe(tube) is connected with flue gas fans entrance pipeline by after entrance threeway 22 tandem.
In concrete enforcement of the present utility model, as shown in Figure 2, described flue gas recirculation exhaust pass comprises flue gas recirculation further and exports female flue 17, one end that flue gas recirculation exports female flue is connected with the outlet of flue gas blower fan, the other end connects two-way flue gas recirculation outlet branch flue 15 by outlet threeway 23, and the other end of two-way flue gas recirculation outlet branch flue is connected with primary air fan inlet duct respectively by after flue gas recirculation outlet branch flue regulating fender 14 and exhanst gas outlet adpting flange 16.
In concrete enforcement of the present utility model, flue gas blower fan and the female pipe flue of flue gas recirculation can be arranged in vacant lot place between electric precipitation and air-introduced machine, determine that flue gas flow rate is 15 ~ 25m/s according to " DLT5121-2000 thermal power plant cigarette wind pulverized coal channel designing technique code " regulation.
Flue gas recirculation device of the present utility model, flue gas system and boiler, the flue gas that boiler tail can be purified sends into primary air system through flue gas blower fan, thus reach reduction First air oxygen content, be conducive to coordinating the boiler that burnout degree is housed to reduce furnace outlet nitrogen oxide.
Claims (3)
1. one kind for reducing the flue gas recirculation device of NO_x formation, comprise by the primary air fan inlet duct be connected in series, primary air fan, the primary air system that First air air supply duct and primary wind and powder outlet are formed, comprise the steam generator system be made up of boiler and back-end ductwork, comprise and being communicated with the back-end ductwork of steam generator system, by smoke discharging pipe, electric dust collector, the smoke evacuation system that flue gases duct and air-introduced machine are formed, it is characterized in that: be connected with by flue gas recirculation gas approach between flue gases duct and primary air fan inlet duct, the flue gas recirculation device that flue gas blower fan and flue gas recirculation exhaust pass connect and compose successively.
2. the flue gas recirculation device for reducing NO_x formation according to claim 1, it is characterized in that: described flue gas recirculation gas approach comprises the identical flue gas recirculation entrance branch pipe(tube) of two line structures further, one end of two-way flue gas recirculation entrance branch pipe(tube) is communicated with affixed respectively by flue entrance regulating fender, flue entrance with flue gases duct after cutting off baffle plate and flue access flange, the other end of two-way flue gas recirculation entrance branch pipe(tube) is connected with flue gas fans entrance pipeline by after entrance threeway tandem.
3. the flue gas recirculation device for reducing NO_x formation according to claim 1, it is characterized in that: described flue gas recirculation exhaust pass comprises flue gas recirculation further and exports female flue, one end that flue gas recirculation exports female flue is connected with the outlet of flue gas blower fan, the other end connects two-way flue gas recirculation outlet branch flue by outlet threeway, and the other end of two-way flue gas recirculation outlet branch flue is connected with primary air fan inlet duct respectively by after flue gas recirculation outlet branch flue regulating fender and exhanst gas outlet adpting flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520039716.2U CN204534555U (en) | 2015-01-21 | 2015-01-21 | A kind of flue gas recirculation device for reducing NO_x formation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520039716.2U CN204534555U (en) | 2015-01-21 | 2015-01-21 | A kind of flue gas recirculation device for reducing NO_x formation |
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| CN204534555U true CN204534555U (en) | 2015-08-05 |
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| CN201520039716.2U Active CN204534555U (en) | 2015-01-21 | 2015-01-21 | A kind of flue gas recirculation device for reducing NO_x formation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969350A (en) * | 2017-04-28 | 2017-07-21 | 国网天津市电力公司 | Method for reducing NO_x formation |
| CN107149866A (en) * | 2017-05-24 | 2017-09-12 | 广东理文造纸有限公司 | CFBB flue gas recirculation and SNCR denitration system |
| CN110500609A (en) * | 2019-08-23 | 2019-11-26 | 润电能源科学技术有限公司 | A kind of boiler waste heat utilization system |
| CN110553248A (en) * | 2019-08-26 | 2019-12-10 | 国网天津市电力公司电力科学研究院 | Method for reducing generation of nitrogen oxides of thermal power generating unit |
-
2015
- 2015-01-21 CN CN201520039716.2U patent/CN204534555U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969350A (en) * | 2017-04-28 | 2017-07-21 | 国网天津市电力公司 | Method for reducing NO_x formation |
| CN107149866A (en) * | 2017-05-24 | 2017-09-12 | 广东理文造纸有限公司 | CFBB flue gas recirculation and SNCR denitration system |
| CN107149866B (en) * | 2017-05-24 | 2019-02-19 | 广东理文造纸有限公司 | Circulating fluidized bed boiler flue gas recirculation and SNCR denitration system |
| CN110500609A (en) * | 2019-08-23 | 2019-11-26 | 润电能源科学技术有限公司 | A kind of boiler waste heat utilization system |
| CN110500609B (en) * | 2019-08-23 | 2021-05-04 | 润电能源科学技术有限公司 | Boiler waste heat utilization system |
| CN110553248A (en) * | 2019-08-26 | 2019-12-10 | 国网天津市电力公司电力科学研究院 | Method for reducing generation of nitrogen oxides of thermal power generating unit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |