CN205860002U - Take out the low NO of high-temperature flue gas preheating typexburner - Google Patents
Take out the low NO of high-temperature flue gas preheating typexburner Download PDFInfo
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- CN205860002U CN205860002U CN201620743915.6U CN201620743915U CN205860002U CN 205860002 U CN205860002 U CN 205860002U CN 201620743915 U CN201620743915 U CN 201620743915U CN 205860002 U CN205860002 U CN 205860002U
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- precombustion chamber
- flue gas
- air
- temperature flue
- burner
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Abstract
The utility model discloses one and take out the low NO of high-temperature flue gas preheating typexBurner, including precombustion chamber, precombustion chamber front end is offered high-temperature flue gas entrance, and is provided with high energy ignition unit；Coal dust First air entrance is offered in the side of precombustion chamber, and back outlet connects primary air piping, and the reduced diameter of precombustion chamber outlet；Outside the most sheathed inner second air sleeve, outer second air sleeve and the tertiary air sleeve of primary air piping, the end of tertiary air sleeve arranges tertiary air enlarging.This utility model can reduce the discharge capacity of nitrogen oxides, reduces the formation of haze, photochemical fog, acid rain etc. from source, makes contributions for air contaminant treatment, and the improvement for ball ecological environment and human habitat is made contributions.This utility model is by using the high-temperature flue gas of back-end ductwork to reduce the demand of the oil required for burner ignition system and combustion gas, cost-effective for enterprise, increase economic efficiency and energy-saving and emission-reduction are made contributions.
Description
[technical field]
This utility model belongs to burner technical field, relates to one and takes out the low NO of high-temperature flue gas preheating typexBurner.
[background technology]
Although the research and development speed of new forms of energy is gradually accelerated, but the energy resource structure of China is still based on coal at present
Body, the coal of exploitation is mostly used in thermal power generation, and thermoelectricity generated energy accounts for the 80.4% of whole nation gross generation.Coal burning produces
The pollutant such as nitrogen oxides, oxysulfide and dust the healthy of people and living environment caused have a strong impact on, fire
The pollution problem of power generating has been subjected to the attention of people.
Nitrogen oxides is one of main atmosphere pollution, is primarily referred to as NO and NO2, the generation and coal dust at high temperature burns
Nitrogen oxides major part be NO.Nitrogen oxides in air is the principal element forming photochemical fog, and is PM2.5
The main source of particle, forms one of principal element of nationwide haze.In addition nitrogen oxides is met water and can be converted into nitric acid
Or nitrous acid, form acid rain, corrosion building etc. and also can be detrimental to health.Therefore NOxDeng pollutant discharge standard by
Year is strict.The control method of nitrogen oxides mainly has denitrating flue gas and the big class of combustion denitration two at present.The most conventional flue gas takes off
Nitre method mainly includes selective catalytic reduction and SNCR method.Combustion denitration technology then includes low NOxCombustion
The methods such as burner, Researched of Air Staging Combustion Burning Pulverized Coal and flue gas recirculation.
Coal powder burner is the capital equipment that thermoelectricity produces, and therefore, how to improve the stability of coal dust firing, drops simultaneously
Low NOxDischarge be coal powder burner research emphasis.The pre-combustion technology of coal dust low temperature is the low NO grown up in recent yearsxCombustion
Burning technology, before coal dust enters burner, first flows into the combustor of reducing atmosphere.Due to hot conditions in combustor, First air
The coal dust inside carried is directly in pre-burning Indoor Combustion, and the nitrogen organic compound in fuel is heated first pyrolysis for Blausure (German)
(HCN), ammonia (NH3) and the intermediate product such as CN.Owing in precombustion chamber, content of oxygen in air is very limited, oxygen is preferential and middle
Product (HCN, NH3And CN) reaction generation H2O、N2And CO2, the oxygen concentration reducing combustion air reduces the life of nitrogen oxides simultaneously
Become.In addition staged air distribution placement technique, makes the oxygen proportion in the gaseous mixture of entrance burner hearth little, it is ensured that coal dust is in low-oxygen environment
Burning, reduces flame temperature, is possible not only to reduce fuel type NOxGenerate and thermal NO can be reducedxGeneration, in local shape
Become reducing atmosphere, effectively reduce NOxDischarge.
[utility model content]
The purpose of this utility model is to solve above-mentioned problem of the prior art, it is provided that a kind of combustion stability is good, NOxRow
That lowers takes out the low NO of high-temperature flue gas preheating typexBurner, this burner
One takes out the low NO of high-temperature flue gas preheating typexBurner, including precombustion chamber, precombustion chamber front end is offered high-temperature flue gas and is entered
Mouthful, and high energy ignition unit is installed；Coal dust First air entrance is offered in the side of precombustion chamber, and back outlet connects primary air piping,
And the reduced diameter of precombustion chamber outlet；The outside the most sheathed inner second air sleeve of primary air piping, outer second air sleeve and three
Secondary windband cylinder, the end of tertiary air sleeve arranges tertiary air enlarging.
This utility model is further improved by:
The side of described inner second air sleeve, outer second air sleeve and tertiary air sleeve is respectively provided with inner second air and enters
Mouth, outer second air entrance and tertiary air entrance.
Described precombustion chamber is made up of precombustion chamber shell body and precombustion chamber inner housing, and high energy ignition unit uses oil gun or combustion gas
Burning torch.
Described high-temperature flue gas entrance includes four spouts around burner axis distribution in a center of symmetry.
The ratio of the outlet diameter d and precombustion chamber inlet diameter D of described precombustion chamber is 0.25～0.5.
Length l of described precombustion chamber is 0.6～0.9 with the ratio of the diameter D of precombustion chamber entrance.
Described burner total length L is 2.5～3 with the ratio of the diameter D of precombustion chamber entrance.
The ratio of momentum that described high-temperature flue gas enters with First air is 1.2～1.5.
The angle [alpha] of described precombustion chamber exit constriction is 45～55 °.
The front end of described primary air piping extend in precombustion chamber.
Compared with prior art, this utility model has the advantages that
This utility model uses the method for the high-temperature flue gas in extraction flue, with the spray being arranged symmetrically with around burner axis
Mouth is sent into precombustion chamber and is mixed with First air.In precombustion chamber, coal dust quickly heats pyrolysis and burning through high-temperature flue gas, in fuel
Nitrogen organic compound is heated first pyrolysis for Blausure (German) (HCN), ammonia (NH3) and the intermediate product such as CN, these intermediate products are few
N can be generated with oxygen reaction under amount Oxygen Condition2, thus reduce fuel type NOxThe effect generated, effectively reduces NOx's
Discharge.The layout of secondary wind and tertiary air uses hierarchical arrangement mode, it is ensured that the intermediate products such as Blausure (German) are at low-oxygen environment
Under burn, not only reduce flame temperature, and Blausure (German) etc. can preferential and oxygen reaction under the conditions of oxygen is inadequate
Generate H2O、N2And CO2, effectively reduce thermal NOxWith fuel type NOxDischarge.
This utility model can reduce the discharge capacity of nitrogen oxides, reduces haze, photochemical fog, acid rain etc. from source
Being formed, make contributions for air contaminant treatment, the improvement for ball ecological environment and human habitat is made contributions.This practicality
The novel demand by using the high-temperature flue gas of back-end ductwork to reduce the oil required for burner ignition system and combustion gas, for
Enterprise is cost-effective, increase economic efficiency and energy-saving and emission-reduction are made contributions.
[accompanying drawing explanation]
Fig. 1 is that this utility model takes out the low NO of high-temperature flue gas preheating typexThe overall structure schematic diagram of burner.
Wherein, 1-high energy ignition unit；2-high-temperature flue gas entrance；3-primary air piping；4-First air entrance；5-inner second air
Sleeve；6-inner second air entrance；7-outer second air sleeve；8-outer second air entrance；9-tertiary air sleeve；10-tertiary air entrance；
11-tertiary air enlarging；12-precombustion chamber shell body；13-precombustion chamber inner housing；14-precombustion chamber.
[detailed description of the invention]
Below in conjunction with the accompanying drawings this utility model is described in further detail:
Seeing Fig. 1, this utility model is by high-energy igniter device (oil gun or ignition air gun), high-temperature flue gas spout, pre-burning
Room, core pipe, coal dust First air entrance, inner second air entrance, inner second air sleeve, outer second air entrance, outer second air sleeve,
Tertiary air entrance, tertiary air sleeve, tertiary air enlarging etc. are constituted.This takes out the low NO of high-temperature flue gas preheating typexBurner is due to profit
With the high-temperature flue gas of 700～800 DEG C, coal dust is lighted effect, therefore can effectively reduce the oil for igniting combustion supporting or combustion
The use consumption of gas, can be that a considerable cost is saved in boiler operatiopn.
This utility model utilizes the high-temperature flue gas of 700～800 DEG C to replace oil, the gas igniter that traditional price is expensive, makes
Coal dust is in the internal divided combustion of precombustion chamber and pyrolysis, and the nitrogen organic compound in fuel is heated and is first pyrolyzed as middle products such as Blausure (German)s
Thing, and generate N with oxygen reaction under low oxygen conditions2, effectively reduce the growing amount of nitrogen oxides.
Due to extracting high-temperature stove cigarette pre-burning, coal dust, in pre-burning Indoor Combustion, can effectively be lowered into the combustion air of burner hearth
Middle oxygen concentration.Therefore pulverized coal conveying and unburned volatilization grade enter burner hearth mixed gas in be practically free of oxygen,
It is beneficial to tissue coal dust high-temperature and low-oxygen combustion in burner hearth, forms reducing atmosphere, reduce NO furtherxThe discharge of pollutant.
In order to improve stability and the heats of coal dust firing, high-temperature flue gas orifice design is to become around burner axis
Four spouts of centrosymmetry distribution.The ratio of precombustion chamber outlet diameter d and precombustion chamber inlet diameter D 0.25～0.5 scope
In.The ratio of precombustion chamber length l and precombustion chamber inlet diameter D is in the range of 0.6～0.9.Burner total length L enters with precombustion chamber
The ratio of mouth diameter D is in the range of 2.5～3.Precombustion chamber exit constriction certain angle α, angular range is at 45～55 degree.In order to protect
The card low-oxygen environment of precombustion chamber and the stability of burning, the ratio of momentum that high-temperature flue gas and First air enter 1.2～1.5 scope
In.Owing to the oxygen in precombustion chamber is almost run out by coal dust firing.Therefore pulverized coal conveying, soot, unburned volatilization grade
Enter in the mixed gas of burner hearth and be practically free of oxygen, be beneficial to tissue coal dust high-temperature and low-oxygen combustion in burner hearth, subtract further
Few NOxThe discharge of pollutant.
Inner second air, outer second air, tertiary air etc. use staged air distribution, it is ensured that in stove, primary zone is low-oxygen environment, make into
The Blausure (German) etc. entering burner hearth can generate N with oxygen reaction under low oxygen conditions2、CO2And H2O, reduces NO furtherxGeneration
Amount.Inner second air takes eddy flow to enter burner, makes flame mix with inner second air fully, it is ensured that the stability of burning；And outward
Secondary wind uses with tertiary air and becomes parallel mode to flow with flame, reduces the mixing intensity of the two, thus is effectively reduced fire
The central temperature of flame, and ensure the low-oxygen environment in burner, make thermal decomposition product Blausure (German) etc. and O2Reaction generates N2, reduce
NOxGeneration.
Work process of the present utility model:
This utility model can apply face-fired boiler turbulent burner, it is also possible to is applied to the straight of tangentially firing boiler
Stream burner, can completely or partially substitute oil required during igniting or combustion gas in use.First First air (is not first bothered to see me out
Coal dust) it is passed through flowing in primary air piping 3, burner is carried out the purging of more than 1 minute.Then by high energy ignition unit 1 and oil
Rifle (gas ignition rifle) is sent into and is instructed ignition location.Sent into the mixture of coal dust and air by First air entrance 4, treat that it enters pre-
Behind combustion room 14, the stove cigarettes of about 800 DEG C are sent into precombustion chamber 14 from high-temperature flue gas entrance 2 (or using high energy ignition unit) and is formed
Flame ignition.Inner second air entrance 6, outer second air entrance 8, tertiary air entrance 10 staged air distribution mode ensures process of coal combustion
In low oxygen combustion environment, in the case of oxygen is insufficient, make Blausure (German) that pulverized coal pyrolysis produces etc. under low oxygen conditions with
Oxygen reaction generates N2、CO2And H2O, reduces NOxGrowing amount.The effect making coal dust stably burn is played in tertiary air enlarging 11.
Above content only illustrates technological thought of the present utility model, it is impossible to limit protection model of the present utility model with this
Enclose, every according to the technological thought that the utility model proposes, any change done on the basis of technical scheme, each fall within this reality
Within protection domain with novel claims.
Claims (10)
1. take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that include that precombustion chamber (14), precombustion chamber (14) front end are offered
High-temperature flue gas entrance (2), and high energy ignition unit (1) is installed；Coal dust First air entrance is offered in the side of precombustion chamber (14)
(4), back outlet connects primary air piping (3), and the reduced diameter that precombustion chamber (14) exports；The outside of primary air piping (3) is successively
Sheathed inner second air sleeve (5), outer second air sleeve (7) and tertiary air sleeve (9), the end of tertiary air sleeve (9) is arranged
Tertiary air enlarging (11).
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described inner second air set
The side of cylinder (5), outer second air sleeve (7) and tertiary air sleeve (9) is respectively provided with inner second air entrance (6), outer second air
Entrance (8) and tertiary air entrance (10).
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described precombustion chamber (14)
Being made up of precombustion chamber shell body (12) and precombustion chamber inner housing (13), high energy ignition unit (1) uses oil gun or gas ignition rifle.
4. according to taking out the low NO of high-temperature flue gas preheating type described in claim 1 or 3xBurner, it is characterised in that described high temperature furnace
Cigarette entrance includes four spouts around burner axis distribution in a center of symmetry.
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described precombustion chamber (14)
Outlet diameter d and the ratio of precombustion chamber inlet diameter D be 0.25～0.5.
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described precombustion chamber (14)
The ratio of diameter D of length l and precombustion chamber (14) entrance be 0.6～0.9.
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described burner overall length
The ratio of degree L and the diameter D of precombustion chamber (14) entrance is 2.5～3.
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described high-temperature flue gas with
The ratio of momentum that First air enters is 1.2～1.5.
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described precombustion chamber goes out
The angle [alpha] that mouth shrinks is 45～55 °.
The most according to claim 1 take out the low NO of high-temperature flue gas preheating typexBurner, it is characterised in that described primary air piping
(3) front end extend in precombustion chamber (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620743915.6U CN205860002U (en) | 2016-07-14 | 2016-07-14 | Take out the low NO of high-temperature flue gas preheating typexburner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620743915.6U CN205860002U (en) | 2016-07-14 | 2016-07-14 | Take out the low NO of high-temperature flue gas preheating typexburner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205860002U true CN205860002U (en) | 2017-01-04 |
Family
ID=57645989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620743915.6U Active CN205860002U (en) | 2016-07-14 | 2016-07-14 | Take out the low NO of high-temperature flue gas preheating typexburner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205860002U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105972588A (en) * | 2016-07-14 | 2016-09-28 | 西安交通大学 | High temperature flue gas extracting pre-burning type low NOx burner |
| CN109058980A (en) * | 2018-06-01 | 2018-12-21 | 西安交通大学 | It is a kind of to can be used for biomass or coal dust be across the low NO of Load RegulationxBurner |
-
2016
- 2016-07-14 CN CN201620743915.6U patent/CN205860002U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105972588A (en) * | 2016-07-14 | 2016-09-28 | 西安交通大学 | High temperature flue gas extracting pre-burning type low NOx burner |
| CN109058980A (en) * | 2018-06-01 | 2018-12-21 | 西安交通大学 | It is a kind of to can be used for biomass or coal dust be across the low NO of Load RegulationxBurner |
| CN109058980B (en) * | 2018-06-01 | 2023-06-02 | 西安交通大学 | Low NO capable of being used for biomass or pulverized coal and adjusting load in a crossing manner x Burner with a burner body |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Xi'an Jiaotong University Siyuan Technology Co., Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2018610000013 Denomination of utility model: Low NOx burner with high temperature smoke precombustion Granted publication date: 20170104 License type: Common License Record date: 20180408 |