CN205447729U - Circulating fluidized bed gas recirculation low -nitrogen combustion system - Google Patents
Circulating fluidized bed gas recirculation low -nitrogen combustion system Download PDFInfo
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- CN205447729U CN205447729U CN201620254492.1U CN201620254492U CN205447729U CN 205447729 U CN205447729 U CN 205447729U CN 201620254492 U CN201620254492 U CN 201620254492U CN 205447729 U CN205447729 U CN 205447729U
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Abstract
The utility model discloses a circulating fluidized bed gas recirculation low -nitrogen combustion system. External recirculated flue gas again is responsible for on draught fan outlet pipe way, gas recirculation be responsible for the reposition of redundant personnel to one, the overgrate air pipeline, constitute primary loop, secondary circuit. Wind, overgrate air, recirculated flue gas 's oxygen volume and temperature accessible oxygen volume detector, temperature detector again coordinate each electromagnetic flow valve, attemperator's use, realize an appropriate allocation secondary wind -warm syndrome and oxygen volume, reduce NOx's formation volume, reach the purpose that reduces the circulating fluidized bed NOx emission.
Description
Technical field
This utility model belongs to field of Environment Protection, is specifically related to a kind of recirculating fluidized bed flue gas recirculation low nitrogen burning system.
Background technology
" fossil-fuel power plant atmospheric pollutant emission standard " GB13223-2011 specifies that the emission limits of nitrogen oxides of key area coal-burning boiler is 100mg/Nm3.CFBB is affected by factors such as the physical characteristic of fuel, air distributions in actual motion, fail that its air stage feeding is fully achieved and reduce the purpose of discharged nitrous oxides, the old unit that especially some beginnings of this century build, the discharge of its nitrogen oxides is far from reaching emission limit standard, and therefore coal-burning power plant takes denitration transformation imperative.
At present, NO is controlledxThe method of discharge can be divided into: denitration and denitrating flue gas in denitration before burning, burning.Denitrating flue gas is the most efficient denitration technology, but its denitration cost is high, complex process.In burning, denitration is for economy, reduces the method for optimizing of nitrogen oxides from coal-fired boiler beyond doubt.Therefore, the secondary wind utilizing flue gas recirculation to configure reasonable oxygen amount reduces the NO of emulsion zonexGrowing amount is to realize reducing CFBB NOxThe effective ways of discharge.
Summary of the invention
The purpose of this utility model is to provide a kind of recirculating fluidized bed flue gas recirculation system, it is achieved reduce the purpose of nitrogen oxides in circulating fluid bed discharge.
This utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of recirculating fluidized bed flue gas recirculation low nitrogen burning system, is connected with recirculation blower 4b by flue gas recycled pipeline between air-introduced machine 4a and chimney, it is achieved flue gas drain；The flue gas of recirculation blower 4b outlet is divided into after two-way respectively through register 3b, register 3c homoiothermic, the air that flue gas after register 3b homoiothermic is sent into primary air fan 4c mix after as First air, in the air distribution plate at the bottom of bed sends into recirculating fluidized bed bed；The air that flue gas after register 3c homoiothermic is sent into overfire air fan 4d mix after as secondary wind, between emulsion zone and the dilute-phase zone of feeding；Oxygen amount detector 5a, temperature monitor 6a it is provided with in flue gas recycled pipeline, it is respectively equipped with oxygen amount detector 5b, oxygen amount detector 5c in First air before air preheater 3a, secondary wind air flue, in First air after air preheater 3a, secondary wind air flue, is respectively equipped with temperature monitor 6b, temperature monitor 6c.
As preferably, described First air and secondary wind are all by entering back into recirculating fluidized bed after air preheater.
As preferably, the described pipeline before register 3b, register 3c is respectively provided with electromagnetic throttle valve 7a, electromagnetic throttle valve 7b.
As preferably, described register 3b, the condensed water that low-temperature receiver is turbine condenser of register 3c.
As preferably, the driving motor of described recirculation blower 4d is frequency conversion motor.
This utility model advantage is: native system can directly be added to CFBB, First air and the oxygen amount of secondary wind and temperature can pass through oxygen amount detector, temperature monitor intuitively shows, coordinate each electromagnetic flow valve, the use of register, pathogenic wind-warm and the oxygen amount of reasonable disposition one secondary wind can be realized, reduce emulsion zone NOxGrowing amount；Meanwhile, bed temperature can be reduced by flue gas recycled, reduce bed and the probability of bed clinkering occurs.
Accompanying drawing explanation
Fig. 1 is the structural scheme of mechanism of recirculating fluidized bed flue gas recirculation low nitrogen burning system.
Detailed description of the invention
Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described in further detail.
With reference to Fig. 1, a kind of recirculating fluidized bed, including conventional burner hearth 1, cyclone separator 2, the flue gas that fluid bed produces is discharged by chimney after air-introduced machine 4a.The recirculating fluidized bed flue gas recirculation low nitrogen burning system of the present invention, carries out drain with recirculation blower 4b to flue gas by flue gas recycled pipeline in the pipeline between air-introduced machine 4a and chimney.In present embodiment, in this section of flue gas recycled pipeline, it is provided with oxygen amount detector 5a, temperature monitor 6a, is used for realizing automatic monitoring and control.The flue gas of recirculation blower 4b outlet is divided into after two-way respectively through register 3b, register 3c homoiothermic, the air that flue gas after register 3b homoiothermic is sent into primary air fan 4c mix after as First air, in the air distribution plate at the bottom of bed sends into recirculating fluidized bed bed；The air that flue gas after register 3c homoiothermic is sent into overfire air fan 4d mix after as secondary wind, between emulsion zone and the dilute-phase zone of feeding.First air and secondary wind are all by entering back into recirculating fluidized bed after air preheater.
In present embodiment, in First air before air preheater 3a, secondary wind air flue, it is respectively equipped with oxygen amount detector 5b, oxygen amount detector 5c.
In present embodiment, in First air after air preheater 3a, secondary wind air flue, it is respectively equipped with temperature monitor 6b, temperature monitor 6c.
In present embodiment, the pipeline before register 3b, register 3c is respectively provided with electromagnetic throttle valve 7a, electromagnetic throttle valve 7b.
In present embodiment, register 3b, the condensed water that low-temperature receiver is turbine condenser of register 3c.
In present embodiment, the driving motor of recirculation blower 4d is frequency conversion motor.
During system work, the outlet of flue gas recycled self-induced-air machine is drawn, and recycled blower fan 4b shunts to mix with air after pressurizeing and respectively enters first and second air pipe line, constitutes the first loop and second servo loop.First and second blower fan outlet is provided with oxygen amount detector, is provided with oxygen amount detector, is provided with electromagnetic throttle valve before the flue gas recycled entrance of first and second blower fan, can accurately regulate the oxygen amount of primary and secondary air, effectively reduce the NO of emulsion zone in recirculation pipexGrowing amount.The inside of the primary and secondary air airduct entering burner hearth is provided with temperature monitor, temperature monitor it is provided with in recirculation pipe, it is respectively equipped with register on each recirculation circuit, is used for regulating the flue gas recycled temperature in each loop, and then regulation first and second pathogenic wind-warm reduces bed temperature and reduces NOxThe purpose generated.
Claims (5)
1. a recirculating fluidized bed flue gas recirculation low nitrogen burning system, it is characterised in that be connected with recirculation blower (4b) by flue gas recycled pipeline between air-introduced machine (4a) and chimney, it is achieved flue gas drain；The flue gas that recirculation blower (4b) exports is divided into after two-way respectively through register (3b), register (3c) homoiothermic, the air that flue gas after register (3b) homoiothermic is sent into primary air fan (4c) mix after as First air, in the air distribution plate at the bottom of bed sends into recirculating fluidized bed bed；The air that flue gas after register (3c) homoiothermic is sent into overfire air fan (4d) mix after as secondary wind, between emulsion zone and the dilute-phase zone of feeding；Oxygen amount detector (5a), temperature monitor (6a) it is provided with in flue gas recycled pipeline, it is respectively equipped with oxygen amount detector (5b), oxygen amount detector (5c) in the front First air of air preheater (3a), secondary wind air flue, in First air after air preheater (3a), secondary wind air flue, is respectively equipped with temperature monitor (6b), temperature monitor (6c).
Recirculating fluidized bed flue gas recirculation low nitrogen burning system the most according to claim 1, it is characterised in that described First air and secondary wind are all by entering back into recirculating fluidized bed after air preheater.
Recirculating fluidized bed flue gas recirculation low nitrogen burning system the most according to claim 1, it is characterised in that be respectively provided with electromagnetic throttle valve (7a), electromagnetic throttle valve (7b) on the pipeline that described register 3b, register (3c) are front.
Recirculating fluidized bed flue gas recirculation low nitrogen burning system the most according to claim 1, it is characterised in that described register (3b), the condensed water that low-temperature receiver is turbine condenser of register (3c).
Recirculating fluidized bed flue gas recirculation low nitrogen burning system the most according to claim 1, it is characterised in that the driving motor of described recirculation blower (4d) is frequency conversion motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620254492.1U CN205447729U (en) | 2016-03-30 | 2016-03-30 | Circulating fluidized bed gas recirculation low -nitrogen combustion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620254492.1U CN205447729U (en) | 2016-03-30 | 2016-03-30 | Circulating fluidized bed gas recirculation low -nitrogen combustion system |
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| CN205447729U true CN205447729U (en) | 2016-08-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969351A (en) * | 2017-05-08 | 2017-07-21 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to reduce the flue gas recirculation method and system of CFBB NOx emission |
| CN107202319A (en) * | 2017-07-06 | 2017-09-26 | 烟台龙源电力技术股份有限公司 | A kind of differential fluidized-bed boiler system and its method for producing circulating flue gas |
| CN107420904A (en) * | 2016-12-26 | 2017-12-01 | 浙江春晖环保能源股份有限公司 | Garbage burning system |
-
2016
- 2016-03-30 CN CN201620254492.1U patent/CN205447729U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420904A (en) * | 2016-12-26 | 2017-12-01 | 浙江春晖环保能源股份有限公司 | Garbage burning system |
| CN107420904B (en) * | 2016-12-26 | 2019-01-25 | 浙江春晖环保能源股份有限公司 | Garbage burning system |
| CN106969351A (en) * | 2017-05-08 | 2017-07-21 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to reduce the flue gas recirculation method and system of CFBB NOx emission |
| CN107202319A (en) * | 2017-07-06 | 2017-09-26 | 烟台龙源电力技术股份有限公司 | A kind of differential fluidized-bed boiler system and its method for producing circulating flue gas |
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