CN109442392A - A kind of gas fired-boiler and its low nitrogen burning method - Google Patents
A kind of gas fired-boiler and its low nitrogen burning method Download PDFInfo
- Publication number
- CN109442392A CN109442392A CN201811314724.8A CN201811314724A CN109442392A CN 109442392 A CN109442392 A CN 109442392A CN 201811314724 A CN201811314724 A CN 201811314724A CN 109442392 A CN109442392 A CN 109442392A
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- China
- Prior art keywords
- air
- smoke
- gas
- flue gas
- flue
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
- F23C7/06—Disposition of air supply not passing through burner for heating the incoming air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/50—Control of recirculation rate
Abstract
The invention discloses a kind of gas fired-boiler and its low nitrogen burning methods.Gas fired-boiler includes furnace body, low NO, combustion chamber etc., and flue outlet is provided with back smoke pipe for smoke backflow to air blower, is sent to low NO and smoke-box respectively, reduces Control for Oxygen Content excess air coefficient in air to achieve the purpose that low nitrogen burning.The technologies such as the present invention is fired again using smoke backflow, Researched of Air Staging Combustion Burning Pulverized Coal controls have the advantages that burning is abundant, flue gas pollutant concentration of emission is low etc..
Description
Technical field
The present invention relates to a kind of gas fired-boiler and its low nitrogen burning methods, belong to energy technology field.
Background technique
In China, environmental problem is increasingly serious, and haze is concerned as the environmental pollution problem wherein most represented.
The study found that nitrogen oxides (NOx) is to lead to one of main pollutant of haze, control NOx emission has become control mist
The most important thing of haze problem.With the adjustment of China's energy resource structure, natural gas ratio shared in energy consumption structure is
Be stepped up, after combustion of natural gas flue gas major pollutants be NOx, therefore combustion of natural gas discharge NOx the problem of increasingly by
To concern.
For the pollutant emission problem of gas fired-boiler etc., country has formulated more stringent environmental protection standard.Wherein, 2015
Year Beijing environment protection office, Administration of Quality and Technology Supervision, Beijing have issued " emission standard of air pollutants for boilers ", it is desirable that new
The NOx emission mass concentration for building gas fired-boiler is strict controlled in 30mg/m3Hereinafter, this brought to the design of gas fired-boiler it is new
Challenge.
Currently, NOx control technology mainly includes low-NOx combustor, fuel staging, air classification, flue gas recirculation, selection
Property non-catalytic reduction and selective catalytic reduction etc..It is increasingly strict due to pollutant emission standard, using monotechnics
It is unable to reach requirement, two or three of technology is needed to combine, the common generation for inhibiting NOx.For gas fired-boiler, selection
The method that low NO, air classification and flue gas recirculating technique combine controls the generation of nitrogen oxides, be at present more
The economically and efficiently choice of technology.In actual industry thermal boiler, the ingredient of fuel can usually be chosen according to local situation,
The variation range of fuel is wide, this proposes challenge for the design and operation of low nitrogen burning.
Summary of the invention
The present invention is intended to provide a kind of gas fired-boiler and its low nitrogen burning method, by drawing flue gas difference from flue outlet
Flowing back into burner and smoke-box reduces excess air coefficient, so that reaching low nitrogen burning reduces the mesh of initial discharged nitrous oxides
's.
The invention is realized by the following technical scheme:
A kind of gas fired-boiler including furnace body, is arranged in the low NO of the furnace body front end, is provided in the furnace body
Combustion chamber, flue and smoke-box, the boiler further include air blower, and the air blower outlet is equipped with primary air piping and burnout degree
Pipe is separately connected the low NO and smoke-box；Smoke pipe is connected with back between the flue outlet and the air blower.
In above-mentioned technical proposal, the primary air piping is equipped with First air regulating valve；The after-flame air hose is equipped with burnout degree tune
Save valve.
In above-mentioned technical proposal, described time smoke pipe is equipped with flue gas recycled regulating valve.
In above-mentioned technical proposal, the combustion chamber and flue wall surface select water wall structure.
In above-mentioned technical proposal, it is 1100~1300 DEG C that the smoke-box, which is arranged to temperature,.
A kind of low nitrogen burning method of gas fired-boiler, comprising:
Air blower supply is bypassed air through, low NO is entered as First air by primary air piping respectively and is passed through
After-flame air hose enters smoke-box as burnout degree；
So that combustion gas is sent into low NO by gas pipeline, is mixed into gas fired-boiler furnace body with First air, and
Low nitrogen imperfect combustion is carried out in the combustion chamber, generates imperfect combustion flue gas；
Enter imperfect combustion flue gas in smoke-box after combustion chamber wall surface heat exchange cooling to be fired completely with burnout degree
It burns, generates high warm flue gas；
Make high warm flue gas after flue heat exchange cools down, part of smoke passes through back as backflow flue gas from flue outlet
Smoke pipe enters air blower, remaining flue gas emission is into atmosphere；
So that backflow flue gas and air is mixed into mixing air in air blower, reduces the oxygen concentration in air, make respectively
Enter low NO to combustion gas formation low nitrogen burning from primary air piping for mixing First air and enters cigarette as burnout degree is mixed
Room carries out low nitrogen burning to imperfect combustion flue gas.
The method also includes: so that part of smoke of the high warm flue gas after flue heat exchange cools down is entered return pipe and makees
For backflow flue gas, the backflow flue gas amount that valve regulation enters air blower is adjusted by flue gas recycled, and is adjusted by First air
The mixing air amount of valve regulation flue gas and air, so that the ratio of the exhaust gas volumn and air capacity into air blower is adjusted, so that
Excess air coefficient into the mixing First air of combustion chamber is 0.8~0.95.
The method also includes: so that part of smoke of the high warm flue gas after flue heat exchange cools down is entered return pipe and makees
For backflow flue gas, valve regulation is adjusted by flue gas recycled and enters the backflow flue gas amount of air blower, and passes through First air respectively
Regulating valve and burnout degree adjust the mixing air amount of valve regulation flue gas and air, to adjust mixing First air and mixing burnout degree
In exhaust gas volumn and air capacity ratio so that into the mixing air Overall excess air coefficient of combustion chamber and smoke-box be 1.1
~1.3.
In above-mentioned technical proposal, the smoke-box temperature is 1100~1300 DEG C.
The present invention has the following advantages and beneficial effects: using flue gas recirculating technique, it is dense to reduce burning indoor oxygen
Degree and ignition temperature, to reach reduction thermal NOxThe effect of generation；Using air classification technology, keep in combustion chamber
Excess air coefficient is 0.8~0.95, so that combustion atmospheres are reducing atmosphere, the NO for enabling burning generatexIt is reduced, reaches drop
Low NOxThe effect of discharge, at the same imperfect combustion flue gas by water-cooling wall cooling after enter smoke-box in fired completely with burnout degree
It burns, smoke-box temperature is 1100~1300 DEG C, reduces thermal NOxGeneration；By flue gas recycled and one wind of air capacity
Machine control, is simplified system apparatus arrangements.
Detailed description of the invention
Fig. 1 is horizontal gas-fired boiler schematic diagram according to the present invention.
In figure: 1-furnace body；2-low NOs；3-combustion chambers；4-smoke-boxes；5-air blowers；6-First air regulating valves；7–
Burnout degree regulating valve；8-flue gas recycled regulating valves；9-flues.
Specific embodiment
A specific embodiment of the invention and the course of work are further described with reference to the accompanying drawing.
The positional terms such as the upper, lower, left, right, front and rear in present specification be positional relationship based on the figure and
It establishes.Attached drawing is different, then corresponding positional relationship is also possible to change therewith, therefore cannot be interpreted as with this to protection model
The restriction enclosed.
As shown in Figure 1, a kind of gas fired-boiler, including furnace body 1, the low NO 2, Yi Jikong of 1 front end of furnace body is set
Gas blower 5.Setting combuster 3, flue 9 and smoke-box 4 in furnace body 1.Combustion chamber 3 and flue 9 constitute three return flues, smoke-box
4 are arranged in 3 end of combustion chamber.It is 1100~1300 DEG C that smoke-box 4, which is arranged to temperature,.Combustion chamber 3 and 9 wall surface of flue select water cooling
Wall construction makes combustion product gases exchange heat in flow process with the working medium in water-cooling wall.
The outlet of air blower 5 is equipped with primary air piping and after-flame air hose is separately connected low NO 2 and smoke-box 4, respectively
Low NO 2 provides First air, provides burnout degree for smoke-box 4.Primary air piping is equipped with First air regulating valve 6, and after-flame air hose is set
There is burnout degree regulating valve 7, adjusts First air and after-flame air quantity respectively.
Combustion gas is connected by gas pipeline with low NO 2, and combustion gas is made to feed low NO 2.
It is connected with back smoke pipe between the outlet of flue 9 and air blower 5, smoke pipe is returned and is equipped with flue gas recycled regulating valve 8, be used for
Adjust the exhaust gas volumn to flow back from flue outlet.
Air is extracted by air blower 5, is entered low NO 2 as First air by primary air piping respectively and is passed through
After-flame air hose enters smoke-box 4 as burnout degree.
So that combustion gas is sent into low NO 2 by gas pipeline, be mixed into gas fired-boiler furnace body 1 with First air,
And low nitrogen imperfect combustion is carried out in combustion chamber 3, generate imperfect combustion flue gas.
Enter imperfect combustion flue gas in smoke-box 4 after the heat exchange cooling of 3 wall surface of combustion chamber to carry out completely with burnout degree
Burning, generates high warm flue gas.
Make high warm flue gas after the heat exchange cooling of flue 9, part of smoke passes through as backflow flue gas from flue outlet
It returns smoke pipe and enters air blower 5, remaining flue gas is by smoke stack emission into atmosphere.
So that backflow flue gas and air is mixed into mixing air in air blower 5, reduces the oxygen concentration in air, make respectively
Enter low NO 2 to combustion gas formation low nitrogen burning from primary air piping for mixing First air and enters cigarette as burnout degree is mixed
Room 4 carries out low nitrogen burning to imperfect combustion flue gas.
In this process, part of smoke of the high warm flue gas after flue heat exchange cools down is made to enter return pipe conduct
Backflow flue gas is adjusted the backflow flue gas amount for entering air blower 5 by flue gas recycled regulating valve 8, and is adjusted by First air
Valve 6 adjusts the mixing air amount of flue gas and air, to adjust the ratio of the backflow flue gas amount and air capacity into air blower 5
Example, so that the excess air coefficient into the mixing First air of combustion chamber 3 is 0.8~0.95.This is because backflow flue gas amount is true
After fixed, adjusting First air regulating valve 6 will make the air side air output by air blower 5 change, to change primary
The excess air coefficient of wind.
In this process, the mixing air amount that backflow flue gas and air are further adjusted by burnout degree regulating valve 7, from
And the ratio of the exhaust gas volumn and air capacity in mixing burnout degree is further changed, the excess air coefficient of burnout degree is had adjusted, is made
It obtains into the mixing air Overall excess air coefficient of combustion chamber 3 and smoke-box 4 between 1.1~1.3.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of gas fired-boiler, the boiler include furnace body (1), setting the furnace body (1) front end low NO (2),
Setting combuster (3), flue (10) and smoke-box (4) in the furnace body (1), which is characterized in that the boiler further includes air
Blower (5), the air blower (5) outlet is equipped with primary air piping and after-flame air hose be separately connected the low NO (2) and
Smoke-box (4)；Smoke pipe is connected with back between flue (9) outlet and the air blower (5).
2. a kind of gas fired-boiler according to claim 1, which is characterized in that the primary air piping is equipped with First air regulating valve
(6)；The after-flame air hose is equipped with burnout degree regulating valve (7).
3. a kind of gas fired-boiler according to claim 2, which is characterized in that described time smoke pipe is adjusted equipped with flue gas recycled
Valve (8).
4. a kind of gas fired-boiler according to claim 1, which is characterized in that the combustion chamber (3) and the choosing of flue (9) wall surface
Use water wall structure.
5. a kind of gas fired-boiler according to claim 1, it is characterised in that: the smoke-box (4) is arranged to temperature and is
1100~1300 DEG C.
6. a kind of low nitrogen burning method of gas fired-boiler, using a kind of gas fired-boiler as described in claim 1, feature exists
In, which comprises
Air blower (5) infeed is bypassed air through, low NO (2) is entered as First air by primary air piping respectively and is led to
After-flame air hose is crossed as burnout degree and enters smoke-box (4)；
So that combustion gas is sent into low NO (2) by gas pipeline, be mixed into gas fired-boiler furnace body (1) with First air,
And low nitrogen imperfect combustion is carried out in combustion chamber (3), generate imperfect combustion flue gas；
Enter imperfect combustion flue gas in smoke-box (4) after the heat exchange cooling of combustion chamber (3) wall surface to carry out completely with burnout degree
Burning, generates high warm flue gas；
Make high warm flue gas after flue (9) heat exchange cooling, part of smoke passes through back as backflow flue gas from flue outlet
Smoke pipe enters air blower (5), remaining flue gas emission is into atmosphere；
So that backflow flue gas and air is mixed into mixing air in air blower (5), reduces the oxygen concentration in air, respectively as
Mixing First air enters low NO (2) to combustion gas formation low nitrogen burning from primary air piping and enters cigarette as burnout degree is mixed
Room (4) carries out low nitrogen burning to imperfect combustion flue gas.
7. a kind of low nitrogen burning method of gas fired-boiler according to claim 6, which is characterized in that the method is also wrapped
It includes: part of smoke of the high warm flue gas after flue heat exchange cools down being made to enter return pipe as backflow flue gas, by following again
Ring smoke regulating valve (8) adjusts the backflow flue gas amount for entering air blower (5) by returning smoke pipe, and passes through First air regulating valve
(6) the mixing air amount of flue gas and air is adjusted, so that the ratio of the exhaust gas volumn and air capacity into air blower (5) is adjusted,
So that the excess air coefficient into the mixing First air of combustion chamber (3) is 0.8~0.95.
8. a kind of low nitrogen burning method of gas fired-boiler according to claim 6 or 7, which is characterized in that the method is also
It include: that part of smoke of the high warm flue gas after flue heat exchange cools down is made to enter return pipe as backflow flue gas, by again
Circulating flue gas regulating valve (8) adjusts the backflow flue gas amount for entering air blower (5) by returning smoke pipe, and passes through First air tune respectively
It saves valve (6) and burnout degree regulating valve (7) adjusts the mixing air amount of flue gas and air, to adjust mixing First air and mixing combustion
The ratio of exhaust gas volumn and air capacity to the greatest extent in wind, so that into the mixing air Overall excess air of combustion chamber (3) and smoke-box (4)
Coefficient is 1.1~1.3.
9. a kind of low nitrogen burning method of gas fired-boiler according to claim 6, it is characterised in that: smoke-box (4) temperature
Degree is 1100~1300 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811314724.8A CN109442392A (en) | 2018-11-06 | 2018-11-06 | A kind of gas fired-boiler and its low nitrogen burning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811314724.8A CN109442392A (en) | 2018-11-06 | 2018-11-06 | A kind of gas fired-boiler and its low nitrogen burning method |
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| CN109442392A true CN109442392A (en) | 2019-03-08 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111578256A (en) * | 2020-05-14 | 2020-08-25 | 天津高德恒立科技有限公司 | Gas boiler temperature control method |
| CN111964042A (en) * | 2020-08-14 | 2020-11-20 | 河南中烟工业有限责任公司 | Energy-saving smoke exhaust system of gas boiler |
| WO2020259576A1 (en) * | 2019-06-28 | 2020-12-30 | 浙江先创能源科技股份有限公司 | Forced internal flue gas circulation furnace |
| CN113587066A (en) * | 2021-08-10 | 2021-11-02 | 岳阳恒盛石化科技有限公司 | Combustion control device and method for gas-fired boiler |
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| CN113587066A (en) * | 2021-08-10 | 2021-11-02 | 岳阳恒盛石化科技有限公司 | Combustion control device and method for gas-fired boiler |
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