CN204345619U - A kind of burner reducing nitrogen oxide emission - Google Patents

A kind of burner reducing nitrogen oxide emission Download PDF

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Publication number
CN204345619U
CN204345619U CN201420735375.8U CN201420735375U CN204345619U CN 204345619 U CN204345619 U CN 204345619U CN 201420735375 U CN201420735375 U CN 201420735375U CN 204345619 U CN204345619 U CN 204345619U
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nozzle
fuel
boiler
gas
burner
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CN201420735375.8U
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许建豪
陈旭桄
曹文玉
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

A kind of burner reducing nitrogen oxide emission, comprise boiler, boiler has a fuel cartridge and the flue gas pipeline with flue gas recirculation blower fan in its outer setting, the fuel gas pipeline of this fuel cartridge has two, article one, the top of the burner arranged with the side of boiler internal furnace wall is communicated with, another is then communicated with flue gas pipeline and forms burning fume mixed pipe line, then is communicated with the bottom of burner by a gas mixer.The combustion gas that the utility model is redesigned by it, combustion air, coal dust, fuel oil and burning fume mist pipeline make the concentration of boiler smoke NOx lower than 100mg/Nm 3, meet national standard, decrease environmental pollution, and the utility model structure is simple, cost is lower, change less to existing boiler, operator's labour intensity reduces greatly.The utility model is applicable to the reduction flue gas nitrogen oxide discharge capacity of large-scale Thermal generation unit and reduces environmental pollution field.

Description

A kind of burner reducing nitrogen oxide emission
Technical field
The utility model relates to a kind of burner, particularly relates to a kind ofly to be applied to large-scale Thermal generation unit by the burner reducing flue gas nitrogen oxide discharge capacity and reduce for the purpose of environmental pollution.
Background technology
At present, China is as thermal power generation big country, about 1,100,000,000 tons, annual consumption coal, nearly 6,000,000 tons of the discharge capacity of nitrogen oxide (hereinafter referred to as NOx), unit coal consumption than external mean height 65 grams, and various Industrial Boiler year consumption coal reach 400,000,000 tons, nearly 2,000,000 tons of the discharge capacity of NOx, cause huge energy waste and environmental pollution, so the task that discharge capacity Yi Shi China of control NOx one of curbing environmental pollution is very urgent.
National environmental protection portion and State Administration for Quality Supervision and Inspection and Quarantine combine in July, 2011 and have issued " fossil-fuel power plant atmospheric pollutant emission standard " GB13223-2011.Standard specifies that on July 1st, 2014 rises, and existing coal unit emission of NOx of boiler concentration should be less than 100mg/Nm 3.
In order to reach above-mentioned target, the domestic method that have employed boiler implosion NOx discharge under prior art, namely adopts low-NOx combustor and Researched of Air Staging Combustion Burning Pulverized Coal two technical combinations application.But be subject to the impact of as-fired coal carbonaceous amount and combustion technology, the combustion system method of operation, the concentration of emission of its NOx is everlasting 300mg/Nm 3~ 500mg/Nm 3between fluctuation.So only rely on two combustion technologies of prior art, be difficult to make emission of NOx of boiler meet national environmental standard requirement.
And in order to the NOx discharge of a nearlyer step under the prior art, also have and reduce boiler tail flue gas purification techniques, this technology significantly can reduce NOx emission, and this technology is divided into two different technology:
1. selective have catalyst reduction method (SCR) denitration technology;
2. selective catalyst-free reducing process (SNCR) denitration technology.
NOx emission concentration, on the basis of burning braking measure, can be declined 80 ~ 90% by the first SCR gas denitrifying technology again.But adopt SCR denitration mode to also have the defect that construction investment is large, catalyst working life is short, floor space is large, operating cost is high.
And the second SNCR gas denitrifying technology is on the basis of burning braking measure, NOx emission concentration can be declined 20 ~ 30% again.But it is the urea liquid directly to spraying 10% in burner hearth, can reduce boiler thermal output, therefore the application of this method is less.
If only adopt prior art that coal unit NOx emission concentration will be made to reach 100mg/Nm 3below, low-NO_x combustion technology in stove first must be adopted to make NOx emission concentration be reduced to below 500mg/Nm3, and then adopt SCR gas denitrifying technology to fall 80 ~ 90% again.But this combination gas firing method implements, and construction investment is large, the parameter of needs supervision is many, and operator's labour intensity is large, therefore is difficult to now promote.
In sum, existing in the urgent need to a kind of novel burner, while NOx discharge being reduced, also need cost lower, invest less, and operator's labour intensity can be reduced.
Utility model content
In order to the coal unit NOx emission concentration solved under prior art is not up to standard, and combination gas firing method implements, and construction investment is large, the parameter of needs supervision is many, the problem that operator's labour intensity is large, the utility model is by having redesigned a kind of novel burner, by low NOx combustion in stove, reduce NOx discharge, and cost is lower simultaneously, less to the change of existing boiler.Concrete structure of the present utility model is as described below:
Reduce a burner for nitrogen oxide emission, comprise boiler, it is characterized in that:
Described boiler has a fuel cartridge and the flue gas pipeline with flue gas recirculation blower fan in its outer setting, the fuel gas pipeline of this fuel cartridge has two, article one, the top of the burner arranged with the side of boiler internal furnace wall is communicated with, another is then communicated with flue gas pipeline and forms burning fume mixed pipe line, then is communicated with the bottom of burner by a gas mixer.
According to a kind of burner reducing nitrogen oxide emission of the present utility model, it is characterized in that, described burner comprises frame, burnout degree nozzle, gas reburning nozzle, air nozzle, rich-lean type coal dust mouth, fuel-air nozzle, fuel nozzle and fuel gas with low heat value nozzle, wherein, frame is the side being fixedly installed on boiler internal furnace wall of vertical shape, the frame support body of frame topmost is provided with burnout degree nozzle, epimere frame support body below this burnout degree nozzle is then provided with gas reburning nozzle, this gas reburning nozzle is communicated with the fuel gas pipeline being directly communicated with boiler internal in the fuel gas pipeline of fuel cartridge, the stage casing frame support body of gas reburning nozzle bottom is provided with air nozzle and rich-lean type coal dust mouth group, the hypomere frame support body of frame is provided with fuel-air nozzle, this fuel-air nozzle one end is at boiler internal, the other end is then connected with outside fuel path by fuel nozzle, fuel gas with low heat value nozzle is then arranged on the foot of frame, this fuel gas with low heat value nozzle communicates with the gas mixer pipeline of boiler exterior.
Designing points is herein, gas reburning nozzle is by fuel cartridge and fuel gas pipeline supply fuel, (temperature is at 300 DEG C ~ 400 DEG C for the combustion gas of another fuel gas pipeline supply and the low-temperature flue gas supplied from the flue gas pipeline with flue gas recirculation blower fan of boiler tail, general in economizer exit position) after gas mixer mixing, then in boiler furnace, supply fuel gas with low heat value by fuel gas with low heat value nozzle.
According to a kind of burner reducing nitrogen oxide emission of the present utility model, it is characterized in that, described is provided with air nozzle and rich-lean type coal dust mouth group on the stage casing frame support body of gas reburning nozzle bottom, and it is specially and is respectively arranged with from top to bottom equally 5 ~ 7 groups, interval air nozzle and rich-lean type coal dust mouth on the frame support body of stage casing.
According to a kind of burner reducing nitrogen oxide emission of the present utility model, it is characterized in that, described burnout degree nozzle, air nozzle and fuel-air nozzle, these nozzles are connected with bellows, be arranged on the large bellows air feed of groove body of boiler exterior by one, in boiler, provide combustion air.
According to a kind of burner reducing nitrogen oxide emission of the present utility model, it is characterized in that, described gas reburning nozzle, rich-lean type coal dust mouth, fuel nozzle are all connected with respective fuel system through bellows with fuel gas with low heat value nozzle, in boiler, provide various combustible.
According to a kind of burner reducing nitrogen oxide emission of the present utility model, it is characterized in that, described gas reburning nozzle is placed in the position of the top 2 ~ 4m of the rich-lean type coal dust mouth of the topmost on the frame support body of stage casing, and burnout degree nozzle is then placed in the position of the top 6 ~ 8m of this rich-lean type coal dust mouth.
According to a kind of burner reducing nitrogen oxide emission of the present utility model, it is characterized in that, described burnout degree nozzle, gas reburning nozzle, air nozzle, fuel-air nozzle and fuel nozzle all can upper and lower 30 ° of swings, adjustment injection direction.
Global design theory of the present utility model is, the frame of burner is the side being fixedly installed on boiler internal furnace wall of vertical shape, from top to bottom order arranges burnout degree nozzle, gas reburning nozzle, air nozzle and rich-lean type coal dust mouth group, the fuel nozzle of fuel-air nozzle and connection thereof and fuel gas with low heat value nozzle, each nozzle respectively from different combustion gas, combustion air, coal dust, fuel oil and burning fume mist pipeline UNICOM, boiler internal is made to form low-NOx coal powder, Researched of Air Staging Combustion Burning Pulverized Coal, gas reburning and flue gas recirculation, make the concentration of boiler smoke NOx lower than 100mg/Nm eventually through the low NOx combustion in stove 3.
A kind of burner reducing nitrogen oxide emission of the present utility model is used to obtain following beneficial effect:
1. a kind of burner reducing nitrogen oxide emission of the present utility model, the combustion gas redesigned by it, combustion air, coal dust, fuel oil and burning fume mist pipeline make the concentration of boiler smoke NOx lower than 100mg/Nm 3, meet national standard, decrease environmental pollution.
2. the utility model structure is simple, cost is lower, and changes less to existing boiler, and operator's labour intensity reduces greatly.
Accompanying drawing explanation
Fig. 1 is a kind of concrete structure schematic diagram reducing the burner of nitrogen oxide emission of the present utility model;
Fig. 2 is that schematic diagram is implemented in a kind of concrete installation reducing the burner of nitrogen oxide emission of the present utility model.
In figure: 1-boiler, 2-fuel cartridge, 2a-fuel gas pipeline, 3-flue gas recirculation blower fan, 3a-flue gas pipeline, 4-gas mixer, A-burner, A1-frame, A2-burnout degree nozzle, A3-gas reburning nozzle, A4-air nozzle, A5-rich-lean type coal dust mouth, A6-fuel-air nozzle, A7-fuel nozzle, A8-fuel gas with low heat value nozzle.
Detailed description of the invention
Below in conjunction with drawings and Examples, a kind of burner reducing nitrogen oxide emission of the present utility model is further described.
Embodiment
As depicted in figs. 1 and 2, a kind of burner reducing nitrogen oxide emission, comprise boiler 1, boiler has a fuel cartridge 2 and the flue gas pipeline 3a with flue gas recirculation blower fan 3 in its outer setting, the fuel gas pipeline 2a of this fuel cartridge has two, article one, the top of the burner A arranged with the side of boiler internal furnace wall is communicated with, and another is then communicated with flue gas pipeline and forms burning fume mixed pipe line, then is communicated with the bottom of burner by a gas mixer 4.
Burner A comprises frame A1, burnout degree nozzle A2, gas reburning nozzle A3, air nozzle A4, rich-lean type coal dust mouth A5, fuel-air nozzle A6, fuel nozzle A7 and fuel gas with low heat value nozzle A8, wherein, frame is the side being fixedly installed on boiler internal furnace wall of vertical shape, the frame support body of frame topmost is provided with burnout degree nozzle, epimere frame support body below this burnout degree nozzle is then provided with gas reburning nozzle, this gas reburning nozzle is communicated with the fuel gas pipeline being directly communicated with boiler internal in the fuel gas pipeline 2a of fuel cartridge 2, the stage casing frame support body of gas reburning nozzle bottom is provided with air nozzle and rich-lean type coal dust mouth group, the hypomere frame support body of frame is provided with fuel-air nozzle, this fuel-air nozzle one end is at boiler internal, the other end is then connected with outside fuel path by fuel nozzle, fuel gas with low heat value nozzle is then arranged on the foot of frame, this fuel gas with low heat value nozzle communicates with gas mixer 4 pipeline of boiler exterior.
Gas reburning nozzle A3 supplies fuel by fuel cartridge 2 and fuel gas pipeline 2a, (temperature is at 300 DEG C ~ 400 DEG C for the combustion gas of another fuel gas pipeline supply and the low-temperature flue gas supplied from the flue gas pipeline 3a with flue gas recirculation blower fan 3 of boiler tail, general in economizer exit position) after gas mixer 4 mixes, then in boiler furnace, supply fuel gas with low heat value by fuel gas with low heat value nozzle A8.
Above-mentioned is provided with air nozzle A4 and rich-lean type coal dust mouth A5 group on the stage casing frame support body of gas reburning nozzle bottom, and it is specially and is respectively arranged with from top to bottom equally 5 ~ 7 groups, interval air nozzle and rich-lean type coal dust mouth on the frame support body of stage casing.
Burnout degree nozzle A2, air nozzle A4 and fuel-air nozzle A6, these nozzles are connected with bellows, be arranged on the large bellows air feed of groove body of boiler exterior, in boiler, provide combustion air by one.
Gas reburning nozzle A3, rich-lean type coal dust mouth A5, fuel nozzle A7 are all connected with respective fuel system through bellows with fuel gas with low heat value nozzle A8, in boiler, provide various combustible.
Gas reburning nozzle A3 is placed in the position of the top 2 ~ 4m of the rich-lean type coal dust mouth A5 of the topmost on the frame support body of stage casing, and burnout degree nozzle A2 is then placed in the position of the top 6 ~ 8m of this rich-lean type coal dust mouth.
Burnout degree nozzle A2, gas reburning nozzle A3, air nozzle A4, fuel-air nozzle A6 and fuel nozzle A7 all can upper and lower 30 ° of swings, adjustment injection direction.
Global design theory of the present utility model is, the frame of burner is the side being fixedly installed on boiler internal furnace wall of vertical shape, from top to bottom order arranges burnout degree nozzle, gas reburning nozzle, air nozzle and rich-lean type coal dust mouth group, the fuel nozzle of fuel-air nozzle and connection thereof and fuel gas with low heat value nozzle, each nozzle respectively from different combustion gas, combustion air, coal dust, fuel oil and burning fume mist pipeline UNICOM, boiler internal is made to form low-NOx coal powder, Researched of Air Staging Combustion Burning Pulverized Coal, gas reburning and flue gas recirculation, make the concentration of boiler smoke NOx lower than 100mg/Nm eventually through the low NOx combustion in stove 3.
In addition, the utility model can install number cover as required in the furnace wall of boiler, further reduces the discharge capacity of NOx.
A kind of burner reducing nitrogen oxide emission of the present utility model, the combustion gas redesigned by it, combustion air, coal dust, fuel oil and burning fume mist pipeline make the concentration of boiler smoke NOx lower than 100mg/Nm 3, meet national standard, decrease environmental pollution, and the utility model structure is simple, cost is lower, change less to existing boiler, operator's labour intensity reduces greatly.The utility model is applicable to the reduction flue gas nitrogen oxide discharge capacity of large-scale Thermal generation unit and reduces environmental pollution field.

Claims (7)

1. reduce a burner for nitrogen oxide emission, comprise boiler (1), it is characterized in that:
Described boiler (1) has a fuel cartridge (2) and the flue gas pipeline (3a) with flue gas recirculation blower fan (3) in its outer setting, the fuel gas pipeline (2a) of this fuel cartridge has two, article one, the top of the burner (A) arranged with the side of boiler internal furnace wall is communicated with, another is then communicated with flue gas pipeline and forms burning fume mixed pipe line, then is communicated with the bottom of burner by a gas mixer (4).
2. a kind of burner reducing nitrogen oxide emission as claimed in claim 1, it is characterized in that, described burner (A) comprises frame (A1), burnout degree nozzle (A2), gas reburning nozzle (A3), air nozzle (A4), rich-lean type coal dust mouth (A5), fuel-air nozzle (A6), fuel nozzle (A7) and fuel gas with low heat value nozzle (A8), wherein, frame is the side being fixedly installed on boiler internal furnace wall of vertical shape, the frame support body of frame topmost is provided with burnout degree nozzle, epimere frame support body below this burnout degree nozzle is then provided with gas reburning nozzle, this gas reburning nozzle is communicated with the fuel gas pipeline being directly communicated with boiler internal in the fuel gas pipeline (2a) of fuel cartridge (2), the stage casing frame support body of gas reburning nozzle bottom is provided with air nozzle and rich-lean type coal dust mouth group, the hypomere frame support body of frame is provided with fuel-air nozzle, this fuel-air nozzle one end is at boiler internal, the other end is then connected with outside fuel path by fuel nozzle, fuel gas with low heat value nozzle is then arranged on the foot of frame, this fuel gas with low heat value nozzle communicates with gas mixer (4) pipeline of boiler exterior.
3. a kind of burner reducing nitrogen oxide emission as claimed in claim 2, it is characterized in that, described is provided with air nozzle (A4) and rich-lean type coal dust mouth (A5) group on the stage casing frame support body of gas reburning nozzle bottom, and it is specially and is respectively arranged with from top to bottom equally 5 ~ 7 groups, interval air nozzle and rich-lean type coal dust mouth on the frame support body of stage casing.
4. a kind of burner reducing nitrogen oxide emission as claimed in claim 2, it is characterized in that, described burnout degree nozzle (A2), air nozzle (A4) and fuel-air nozzle (A6), these nozzles are connected with bellows, be arranged on the large bellows air feed of groove body of boiler exterior by one, in boiler, provide combustion air.
5. a kind of burner reducing nitrogen oxide emission as claimed in claim 2, it is characterized in that, described gas reburning nozzle (A3), rich-lean type coal dust mouth (A5), fuel nozzle (A7) are all connected with respective fuel system through bellows with fuel gas with low heat value nozzle (A8), in boiler, provide various combustible.
6. a kind of burner reducing nitrogen oxide emission as claimed in claim 2, it is characterized in that, described gas reburning nozzle (A3) is placed in the position of the top 2 ~ 4m of the rich-lean type coal dust mouth (A5) of the topmost on the frame support body of stage casing, and burnout degree nozzle (A2) is then placed in the position of the top 6 ~ 8m of this rich-lean type coal dust mouth.
7. a kind of burner reducing nitrogen oxide emission as claimed in claim 2, it is characterized in that, described burnout degree nozzle (A2), gas reburning nozzle (A3), air nozzle (A4), fuel-air nozzle (A6) and fuel nozzle (A7) all can upper and lower 30 ° of swings, adjustment injection direction.
CN201420735375.8U 2014-11-28 2014-11-28 A kind of burner reducing nitrogen oxide emission Active CN204345619U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106322368A (en) * 2016-10-13 2017-01-11 王立臣 Ultra-low nitrogen combustor and combustion method thereof
CN106871111A (en) * 2017-03-21 2017-06-20 中国华能集团公司 A kind of W flame boiler composite denitration system and method
CN110454777A (en) * 2019-06-28 2019-11-15 浙江先创能源科技股份有限公司 A kind of combustion gas stratified combustion boiler, control system and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106322368A (en) * 2016-10-13 2017-01-11 王立臣 Ultra-low nitrogen combustor and combustion method thereof
CN106871111A (en) * 2017-03-21 2017-06-20 中国华能集团公司 A kind of W flame boiler composite denitration system and method
CN106871111B (en) * 2017-03-21 2023-08-08 中国华能集团公司 W flame boiler composite denitration system and method
CN110454777A (en) * 2019-06-28 2019-11-15 浙江先创能源科技股份有限公司 A kind of combustion gas stratified combustion boiler, control system and method

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