CN101907295A - Low-NOx combustor for combusting coal water slurry and combustion method - Google Patents
Low-NOx combustor for combusting coal water slurry and combustion method Download PDFInfo
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- CN101907295A CN101907295A CN 201010252079 CN201010252079A CN101907295A CN 101907295 A CN101907295 A CN 101907295A CN 201010252079 CN201010252079 CN 201010252079 CN 201010252079 A CN201010252079 A CN 201010252079A CN 101907295 A CN101907295 A CN 101907295A
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Abstract
The invention relates to a combustor and aims to provide a low-NOx combustor for combusting coal water slurry and a combustion method. The combustor comprises a coal water slurry gun sleeve, a primary air pipe and a secondary air pipe which are sequentially and coaxially arranged from inside to outside, wherein the outside of the secondary air pipe is at least provided with a coaxially sleeved combustion air pipe for controlling NOx. In the invention, combustion-supporting air is sent into a combustion chamber by multiple layers (whiffs) to control the mixing of the combustion-supporting air and the coal water slurry so as to control the oxygen concentration of the coal water slurry in the whole combustion process; gaps are preserved between various whiffs of combustion-supporting air according to the combustion characteristics of the coal water slurry so as to delay the mixing of the combustion-supporting air and the coal water slurry; a part of the combustion-supporting air is distributed by adopting direct current, which has the effect of stopping external combustion-supporting air from mixing with flames; and the flaring angles of all nozzles of the combustor are different so that the mixing of all air layers and the flame length are reasonably controlled.
Description
Technical field
The present invention relates to a kind of burner, particularly a kind of low-NOx combustor for combusting coal water slurry and combustion method.
Background technology
Energy and environment are significant problems of Chinese national economy development, and energy industry is again one of developing pillar industry of Chinese national economy." oil-poor rich coal " is the national conditions of China, and reserves has forced us not burn it as just fuel.But current domesticly also have a large amount of oil fired power stations and fuel industrial boiler and fuel oil boiler for domestic consuming a large amount of petroleum resources, must seek a kind of cleaning for oil fuel to solve the situation of China's oil famine.Water-coal-slurry has advantages such as low price, low pollution, technology maturation as a kind of oil-fired substitute, but the NOx emission pollution problem also more and more is subject to people's attention in the coal-water slurry combustion.Yet, because the defective of current combustion device self structure causes existing combusting coal water slurry burner NOx discharging generally higher.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, and the design by the burner structure aspect reduces NOx discharging in the coal-water slurry combustion, and then a kind of low-NOx combustor for combusting coal water slurry is provided.
The source of NOx mainly is fuel type NOx in the coal-water slurry combustion, be the NOx that N element contained in the water-coal-slurry is oxidized in combustion process, the growing amount of fuel NOx depends mainly on the control of oxygen concentration in the combustion process, keep the low oxygen combustion environment and can effectively suppress the NOx generation, if but oxygen supply deficiency, to influence efficiency of combustion, cause energy waste.Studies show that through the inventor: have water coal slurry burner why so high its main cause of NOx concentration of emission be that combustion air and fuel are sneaked into too early in the combustion process, the N major part in the coal water slurry fuel has changed into NOx.If oxygen concentration all is controlled at below 3%～5% in the whole combustion process, then the NOx concentration of emission can control to present water coal slurry burner concentration 80% in addition lower.Purpose of the present invention just provides the water-coal-slurry burner special that a kind of NOx discharging is low, efficiency of combustion is high, rationally controls mixing of combustion air and water-coal-slurry by burner design, realizes the control that NOx discharges, and the NOx concentration of emission is controlled at 300mg/Nm
3Below.
Be the technical solution problem, the invention provides a kind of low-NOx combustor for combusting coal water slurry, comprise from the inside to the outside coal water slurry gun sleeve pipe that concentric successively arranges, wind airduct and secondary wind airduct; The outside of described secondary wind airduct also has combustion air (hereinafter to be referred as " NOx the wind ") pipe of the sheathed control NOx of concentric at least.
Among the present invention, described each airduct is provided with air door or adjusting device respectively, is used to control the flow of wind.
Among the present invention, establish the interval of filling castable refractory between the tube wall of described each wind tube outlet end, offer spout on the interval.
Among the present invention, described spout be shaped as ring-type, or arrange ringwise between the circular hole of establishing.
Among the present invention, described spout has enlarging, and each airduct spout has different flaring angles.
The present invention further provides a kind of cool water mixture burning method, except that wind and secondary wind, also used one NOx wind at least based on preceding described low-NOx combustor for combusting coal water slurry; In a described wind, secondary wind and the NOx wind, existing direct current wind has eddy flow wind again.
The present invention is divided into multilayer (thigh) with the secondary air channel in the former water coal slurry burner layout, and will leave rational gap between each strand wind; Each layer wind inlet can be provided with air door as required, controls each layer air quantity, adapts to different coal slurry needs, and each layer wind can adopt eddy flow or direct current as required, and swirl strength can be regulated.The direct current wind action is to intercept combustion air to mix with the too early of water-coal-slurry; Regulate swirl strength and can adjust the length of flame, guarantee efficiency of combustion; The angle difference is expanded in each wind outlet, with the mixing and the length of flame of reasonable each layer of control wind.Effectively control mixing of combustion air and water-coal-slurry by above measure, guarantee that the whole combustion process of water-coal-slurry all carries out under best oxygen concentration, under the prerequisite that guarantees efficiency of combustion, significantly reduce the NOx discharging.
Beneficial effect of the present invention is:
(1) combustion air branch multilayer (thigh) is sent into the combustion chamber, the control combustion air mixes with water-coal-slurry, thereby realizes the control of the oxygen concentration of the whole combustion process of water-coal-slurry;
(2) be provided with the gap according to the cool water mixture burning characteristic between each strand combustion air, delay mixing of combustion air and water-coal-slurry flame;
(3) the part combustion air adopts direct current to arrange, plays to intercept the effect that outside combustion air mixes with flame;
(4) each spout flaring angle difference of burner is with the mixing and the length of flame of reasonable each layer of control wind.
Description of drawings
Fig. 1 is low NOx water coal slurry burner example block diagram.
1 tertiary air air door; 2 wind air doors; 3 secondary wind swirl strength adjusting devices; 4 coal water slurry gun sleeve pipes; 5 wind airducts; 6 secondary wind airducts; 7 tertiary air airducts.
The specific embodiment
Below in conjunction with accompanying drawing 1, the specific embodiment of the present invention is set forth.
In the conventional burners, combustion air is divided into " wind " and " secondary wind " two parts usually.Among the present invention, the water-coal-slurry low-NOx combustor is further divided into two strands with " secondary wind ", is called " secondary wind " and " tertiary air " respectively.
In the present embodiment, low-NOx combustor for combusting coal water slurry comprises coal water slurry gun sleeve pipe 4, one time wind airduct 5, secondary wind airduct 6, tertiary air airduct 7 take concentric circles sleeve structure from the inside to the outside to arrange, in a wind airduct 5, be furnished with torch oil gun sleeve pipe and igniter sleeve pipe, the oil gun and the spark ignition rifle that use when arranging automatic igniting.Combustion air is then from traditional separated into two parts, becomes to be divided into three parts through the burner nozzle input.Wherein: one time wind is eddy flow, and swirl strength is fixed, and is adjustable by the damper air quantity; Secondary wind eddy flow is adjustable, and regulative mode adopts existing adjustable cyclone structure; Tertiary air is a direct current, and is adjustable by the damper air quantity.Mix with primary air for delaying tertiary air, control NOx generates, and tertiary air and secondary wind spacing are drawn back, and it is about 100mm that spacing is set.The spout outlet of wind, secondary wind, each airduct of tertiary air all is designed to the enlarging shape, one time the wind flaring angle is greater than secondary wind, tertiary air is a direct current wind, annulus of design at interval between overfire air port and tertiary air spout, fill with refractory material, to delay mixing of tertiary air and coal slurry, control NOx generates.
The air quantity of this burner tertiary air accounts for about 40% of total blast volume.Water-coal-slurry is when this burner combustion, and one time wind guarantees the wind supply of burning initiation combustion, and the air quantity ratio of a wind is lower than 20%, and the initial stage oxygen amount that guarantees to catch fire effectively suppresses fugitive constituent NOx and generates a little less than the fugitive constituent oxygen demand of burning; Because a wind enlarging is bigger, secondary wind mixes with primary air is postponed, secondary wind just progressively mixes with primary air when coke takes fire, because tertiary air is not also sneaked into, this moment, the flame region excess air coefficient only about 0.8, coke ambient oxygen concentration is still kept than low value, generally is no more than 5%, and the generation of char N Ox is fully suppressed; Because leave at interval between tertiary air and secondary wind, tertiary air was delayed with mixing of primary air, when tertiary air mixed with primary air, coke 70%～80% is after-flame, was mainly used in the after-flame of uncompleted burned carbon after tertiary air is sneaked into.Because combustion process all is in oxygen debt condition before tertiary air is sneaked into, the NOx growing amount seldom, tertiary air is sneaked into after-combustion atmosphere and is changed oxygen enrichment into, but most of coke after-flame so the NOx growing amount can be not too many yet, thereby has been realized the inhibition of NOx in the combustion process.Send into step by step if tertiary air is divided into multiply again, it is better that then NOx suppresses effect.
The above, it only is case study on implementation of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferable case study on implementation, yet be not in order to limit the present invention, any those skilled in the art are not in breaking away from the technical solution of the present invention scope, when the structure that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent case study on implementation of equivalent variations.But every content that does not break away from technical solution of the present invention, any simple modification, equivalent variations and modification according to technical spirit of the present invention is done above case study on implementation all still belong in the technical solution of the present invention scope.
Claims (5)
1. low-NOx combustor for combusting coal water slurry, comprise from the inside to the outside coal water slurry gun sleeve pipe that concentric successively arranges, wind airduct and secondary wind airduct, it is characterized in that the outside of described secondary wind airduct also has at least sheathed being used to of concentric to control the combustion-supporting airduct of NOx.
2. low-NOx combustor for combusting coal water slurry according to claim 1 is characterized in that, establishes the interval of filling castable refractory between the tube wall of described each wind tube outlet end, offers spout on the interval.
3. low-NOx combustor for combusting coal water slurry according to claim 2 is characterized in that, described spout be shaped as ring-type, or arrange ringwise between the circular hole of establishing.
4. low-NOx combustor for combusting coal water slurry according to claim 2 is characterized in that described spout has enlarging, and each airduct spout has different flaring angles.
5. the cool water mixture burning method based on the described low-NOx combustor for combusting coal water slurry of claim 1 is characterized in that, except that wind and secondary wind, and the combustion air that also uses one control NOx at least to generate; In the combustion air that a described wind, secondary wind and control NOx generate, existing direct current wind has eddy flow wind again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010252079 CN101907295A (en) | 2010-08-12 | 2010-08-12 | Low-NOx combustor for combusting coal water slurry and combustion method |
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| CN 201010252079 CN101907295A (en) | 2010-08-12 | 2010-08-12 | Low-NOx combustor for combusting coal water slurry and combustion method |
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| CN 201010252079 Pending CN101907295A (en) | 2010-08-12 | 2010-08-12 | Low-NOx combustor for combusting coal water slurry and combustion method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679339A (en) * | 2012-06-05 | 2012-09-19 | 唐山市金沙工贸有限公司 | Pulverized coal burner |
| CN104791784A (en) * | 2015-03-03 | 2015-07-22 | 杭州福鼎节能科技服务有限公司 | Coal water slurry pelletizing and gunite device |
| CN106287691A (en) * | 2015-05-15 | 2017-01-04 | 四川天法科技有限公司 | A kind of water-coal-slurry injection boiler eddy flow low-NOx combustor of top layout |
| CN104566401B (en) * | 2014-12-31 | 2017-08-11 | 华中科技大学 | The combustion method of oxygenation containing wet mud and device |
| CN110793033A (en) * | 2018-08-01 | 2020-02-14 | 四川天法科技有限公司 | Biomass fuel slurry steam injection boiler rotational flow stable combustion burner |
| CN111219709A (en) * | 2014-05-15 | 2020-06-02 | 韩国生产技术研究院 | Combustion device for separate combustion and mixed combustion of petroleum coke fuel |
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| GB1501306A (en) * | 1975-07-05 | 1978-02-15 | Ludwig Ofag Indugas Gmbh | Burners |
| GB1523437A (en) * | 1974-11-19 | 1978-08-31 | Nu Way Heating Plants Ltd | Burners for liquid fuels |
| JPH0861613A (en) * | 1994-08-24 | 1996-03-08 | Ebara Boiler Kk | Low nox burner |
| CN101230979A (en) * | 2007-01-24 | 2008-07-30 | 中国科学院工程热物理研究所 | Methanol atomizing combustion nozzle |
| CN101556041A (en) * | 2009-05-25 | 2009-10-14 | 中国中材国际工程股份有限公司 | Multi-medium multi-channel discrete low-NOx pulverized coal burner for rotary cement kiln |
| CN101666489A (en) * | 2009-09-28 | 2010-03-10 | 西安交通大学 | Combustion device of petroleum coke slurry |
| CN201779650U (en) * | 2010-08-12 | 2011-03-30 | 浙江百能科技有限公司 | CWS (coal water slurry) fired low nitrogen oxide combustor |
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2010
- 2010-08-12 CN CN 201010252079 patent/CN101907295A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1523437A (en) * | 1974-11-19 | 1978-08-31 | Nu Way Heating Plants Ltd | Burners for liquid fuels |
| GB1501306A (en) * | 1975-07-05 | 1978-02-15 | Ludwig Ofag Indugas Gmbh | Burners |
| JPH0861613A (en) * | 1994-08-24 | 1996-03-08 | Ebara Boiler Kk | Low nox burner |
| CN101230979A (en) * | 2007-01-24 | 2008-07-30 | 中国科学院工程热物理研究所 | Methanol atomizing combustion nozzle |
| CN101556041A (en) * | 2009-05-25 | 2009-10-14 | 中国中材国际工程股份有限公司 | Multi-medium multi-channel discrete low-NOx pulverized coal burner for rotary cement kiln |
| CN101666489A (en) * | 2009-09-28 | 2010-03-10 | 西安交通大学 | Combustion device of petroleum coke slurry |
| CN201779650U (en) * | 2010-08-12 | 2011-03-30 | 浙江百能科技有限公司 | CWS (coal water slurry) fired low nitrogen oxide combustor |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679339A (en) * | 2012-06-05 | 2012-09-19 | 唐山市金沙工贸有限公司 | Pulverized coal burner |
| CN102679339B (en) * | 2012-06-05 | 2014-05-07 | 唐山市金沙工贸有限公司 | Pulverized coal burner |
| CN111219709A (en) * | 2014-05-15 | 2020-06-02 | 韩国生产技术研究院 | Combustion device for separate combustion and mixed combustion of petroleum coke fuel |
| CN104566401B (en) * | 2014-12-31 | 2017-08-11 | 华中科技大学 | The combustion method of oxygenation containing wet mud and device |
| CN104791784A (en) * | 2015-03-03 | 2015-07-22 | 杭州福鼎节能科技服务有限公司 | Coal water slurry pelletizing and gunite device |
| CN106287691A (en) * | 2015-05-15 | 2017-01-04 | 四川天法科技有限公司 | A kind of water-coal-slurry injection boiler eddy flow low-NOx combustor of top layout |
| CN110793033A (en) * | 2018-08-01 | 2020-02-14 | 四川天法科技有限公司 | Biomass fuel slurry steam injection boiler rotational flow stable combustion burner |
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Application publication date: 20101208 |