CN1317526C - Combustion method of fossil fuel and equipment thereof - Google Patents
Combustion method of fossil fuel and equipment thereof Download PDFInfo
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- CN1317526C CN1317526C CNB2005100115415A CN200510011541A CN1317526C CN 1317526 C CN1317526 C CN 1317526C CN B2005100115415 A CNB2005100115415 A CN B2005100115415A CN 200510011541 A CN200510011541 A CN 200510011541A CN 1317526 C CN1317526 C CN 1317526C
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Abstract
The present inventiona relates to a combustion method and a device for fossil fuel, particularly to a combustion technology and equipment which use the fossil fuel as powdery suspension combustion. The present invention is characterized in that oxygen is added in a combustion chamber before primary air airflow carrying powder fuel enters the combustion chamber so as to increase the oxygen containing concentration of the primary air airflow; the oxygen concentration is in a scope ranging from 22 to 35%, the airflow containing powder comprises the mixed airflow of air and powder, which enters a primary air pipe and carries the powder fuel, concentrated airflow separated by a shade separator and the mixed flow of the air and the powder of a preheating chamber (or a precombustion chamber). The present invention enhances the condition analyzed by the volatilization of the fossil fuel, and more volatile components are more quickly and intensively separated; thus, the present invention is favourable for improving the fire stability of the airflow containing powder, reducing the generation of NOx, and improving CO2 concentration in smoke gas.
Description
Technical field
The present invention relates to a kind of combustion technology and equipment of fossil fuel, be particularly related to a kind of combustion technology and equipment of making (comprising coal, coke powder, petroleum coke) the powdery suspension combustion with fossil fuel, be mainly boiler, also can be stove, heating furnace, coal gasification generator etc.Belong to combustion technology and equipment technical field.
Background technology
In fossil fuel (comprising coal, coke powder, petroleum coke) powdery suspension combustion process, fuel particle is in state continuous motion and that constantly carry out chemical reaction in the combustion chamber.Nitrogen containing component in the fuel (being fuel bound nitrogen) is NO
xMain source.Fuel particle is after pyrolysis, and a fuel bound nitrogen part is together separated out with volatile matter, becomes volatile matter nitrogen, and all the other remain in the fuel of burnt shape, becomes coke nitrogen.Volatile matter nitrogen forms in burning early stage, if it is in the atmosphere of a reproducibility, it can be than being easier to be reduced into stable nitrogen molecule.In general, volatile matter is separated out many more soon more in the pyrolytic process at burning initial stage, and reducing atmosphere is also strong more, NO in that local space is concentrated more for volatile matter
xGeneration just few more; Simultaneously, bigger volatile producibility can improve the porosity of thermal decomposition product coke, improves coke in the combustion reaction activity in later stage, is beneficial to stable ignition, and better the coke of reactivity can reduce the NO that generates effectively
xThereby, further reduce NO
xDischarge capacity, and improve efficiency of combustion.So volatile matter can not only many but also fast separating out, and is to reduce NO
xGeneration and the catch fire key of steady combustion property of raising.
The productive rate of volatile matter and rate of release are subjected to the significant impact of the rate of heat addition, and the rate of heat addition can improve volatile producibility and improve rate of release faster.The volatile matter of fossil fuel is separated out mainly and is finished in its heating pyrolyze process, and the energy part of heating derives from the high-temperature flue gas in the combustion chamber, and another part derives from the combustion chemistry reaction of part of fuel in wind.Burners in prior generally all is that dusty fuel is mixed with air (oxygen concentration is 21%), carries powder fuel by air and sends into burner hearth.In some cases, also from the back-end ductwork of combustion apparatus suction part of smoke, as a general mood body that carries powder fuel, in this case, the oxygen concentration in wind is lower.Cross carrying out fast that low oxygen concentration obviously is unfavorable for reacting.In other words, appropriateness increases the oxygen concentration in the wind one time, makes the rate of heat addition of powdery fossil fuel improve greatly, and the initially amount of separating out of volatile matter and precipitation rate increase, and to various fossil fuels, can improve the steady combustion property of catching fire, and realizes low NO
xBurning.It is a kind of effective way that concentration of oxygen in the powder air-flow (dividing potential drop) is taken in the appropriateness increase.
Summary of the invention
In order to strengthen the steady combustion property of catching fire, reduce nitrogen oxide (NO
x) generate and improve carbon dioxide (CO in the tail flue gas
2) concentration, the present invention proposes a kind of combustion method and device that increases the pulverized coal borne air flow oxygen concentration, the condition that makes the volatile matter of fossil fuel separate out strengthens, and volatile matter can be separated out faster, more concentrated and more, thereby further improves the combustion stability of gas-solid air-flow and reduce NO
xGeneration.
Technical scheme of the present invention is as follows:
A kind of combustion method of fossil fuel, it is characterized in that: this combustion method is to add oxygen before a general mood of carrying powder fuel flows to the combustion chamber, the oxygen concentration that enters the air-flow before the combustion chamber is increased, described oxygen concentration is 22～35%, the described air-flow that enters before the combustion chamber comprises the gas powder mixed airflow that carries powder fuel that enters an airduct, or dense strand of air-flow after dense-and-weak separator separates.
The present invention also provides a kind of burner of implementing described method, comprises airduct and the combustion chamber that links to each other with this airduct, it is characterized in that: be provided with the oxygen intake passage on an airduct.
The invention provides the another kind of burner of implementing described method, comprise airduct one time, be arranged on the dense-and-weak separator of an airduct back, thin airflow passage, dense strand of gas channel and the combustion chamber that links to each other with thin airflow passage and dense thigh gas channel respectively is characterized in that: be provided with the oxygen intake passage on described dense strand of gas channel.
The invention provides the burner that another implements described method, comprise airduct one time, be arranged on the dense-and-weak separator of an airduct back, the thin airflow passage, dense strand of gas channel, preheating chamber that links to each other with dense strand of gas channel or precombustion chamber and the combustion chamber that links to each other with this preheating chamber or precombustion chamber is characterized in that: be provided with the oxygen intake passage on described dense strand of gas channel, or the oxygen intake passage is arranged on preheating chamber or the precombustion chamber.
The present invention compared with prior art, have the following advantages and the high-lighting effect: the oxygen concentration that 1. suitably increases pulverized coal borne air flow, can improve the fire behaviour of air-flow greatly, this is highly beneficial to the low fossil fuel of combustion of fossil fuels especially volatile matter, can reduce and help fuel oil; 2. suitably increase the oxygen concentration of pulverized coal borne air flow, can reduce NO greatly
xGeneration, make and satisfy strict environmental requirement, avoid using investment and all very expensive out of stock SCR device of flue gas of operating cost, maybe can reduce the burden of SCR by the improvement of combustion technology itself, improve the efficiency of combustion of fuel greatly, make power plant's environmental protection operation more economical; 3. suitably increase the oxygen concentration of pulverized coal borne air flow, can be beneficial to improve CO in the combustion product
2Concentration, collect CO for catching effectively
2Condition is provided.
Description of drawings
Fig. 1 is the structural principle schematic diagram of a kind of embodiment provided by the invention.
Fig. 2 is the structural principle schematic diagram of another kind of embodiment provided by the invention.
The structural principle schematic diagram of Fig. 3 another embodiment provided by the invention.
The specific embodiment
A kind of combustion method that increases the pulverized coal borne air flow oxygen concentration provided by the invention, it is characterized in that before a general mood of carrying powder fuel flows to the combustion chamber, adding oxygen, its oxygen concentration is suitably increased, described oxygen concentration is 22～35%, the described pulverized coal borne air flow that enters before the combustion chamber comprises the air-flow that carries the fuel powder that enters an airduct, or dense strand of air-flow behind dense-and-weak separator.Fig. 1 is the structural principle schematic diagram of a kind of embodiment provided by the invention.Mainly form by airduct road 1, oxygen intake passage 2 and a combustion chamber 3; Described oxygen intake passage is arranged on airduct road 1.
For conserve oxygen, on the basis of such scheme, the present invention combines with dense-dilute burner combustion technology (being rich or poor combustion technology).The latter's operation principle is that the air-flow (wind) that will carry the fuel powder is divided into two strands of different air-flows of granule density height, promptly dense thigh air-flow and thin airflow by certain separator.After deep or light separation, dense strand of air-flow injected the combustion chamber and can be more prone to form a high-temperature region that fuel particle concentration is high, reduces the ignition heat of air-flow, and volatile matter is discharged in regional area comparison concentrated area, is beneficial to improve to catch fire steady combustion and reduce NO
xGenerate.Because after the deep or light separation, most of fuel particle concentrates on dense strand, most gas is at light strand, and the oxygen concentration that increases dense strand is more effective, economical.Fig. 2 is the structural principle schematic diagram of another kind of embodiment provided by the invention.It mainly is made up of airduct road 1, oxygen intake passage 2, combustion chamber 3, light-dark separation device 4, dense thigh gas channel 5 and a thin airflow passage 6, and described oxygen intake passage 2 is arranged on the dense strand of gas channel 5.
The structural principle schematic diagram of Fig. 3 another embodiment provided by the invention.Mainly form by airduct road 1, oxygen intake passage 2, combustion chamber 3, light-dark separation device 4, dense strand of gas channel 5, thin airflow passage 6 and preheating chamber or precombustion chamber 7.It is on the basis of embodiment two, before dense strand of air-flow sent into the combustion chamber, add and put a preheating chamber or precombustion chamber 7, to improve the temperature before the combustion chamber of entering of dense strand gas powder, described oxygen intake passage 2 can be arranged on preheating chamber or the precombustion chamber 7, its particular location can be arranged on the side wall or back wall of preheating chamber (or precombustion chamber), also can be arranged on the dense strand of gas channel 5.
Claims (2)
1, a kind of burner of fossil fuel, comprise an airduct (1), be arranged on the dense-and-weak separator (4) of an airduct back, thin airflow passage, dense strand of gas channel and the combustion chamber (3) that links to each other with thin airflow passage and dense thigh gas channel respectively is characterized in that: be provided with oxygen intake passage (2) on described dense strand of gas channel.
2, a kind of burner of fossil fuel, comprise an airduct (1), be arranged on the dense-and-weak separator (4) of an airduct back, thin airflow passage (6), dense strand of gas channel (5), preheating chamber that links to each other with dense strand of gas channel or precombustion chamber (7) and the combustion chamber (3) that links to each other with this preheating chamber or precombustion chamber is characterized in that: be provided with oxygen intake passage (2) on described dense strand of gas channel, or oxygen intake passage (2) is arranged on preheating chamber or the precombustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100115415A CN1317526C (en) | 2005-04-08 | 2005-04-08 | Combustion method of fossil fuel and equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100115415A CN1317526C (en) | 2005-04-08 | 2005-04-08 | Combustion method of fossil fuel and equipment thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1687638A CN1687638A (en) | 2005-10-26 |
| CN1317526C true CN1317526C (en) | 2007-05-23 |
Family
ID=35305680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100115415A Expired - Fee Related CN1317526C (en) | 2005-04-08 | 2005-04-08 | Combustion method of fossil fuel and equipment thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1317526C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968220B (en) * | 2010-10-28 | 2012-01-11 | 河北工业大学 | Low nitrogen oxide burning process as well as burning device and application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4509915A (en) * | 1981-09-21 | 1985-04-09 | Osaka Gas Company Limited | Liquid fuel combustion apparatus |
| CN2038195U (en) * | 1988-05-15 | 1989-05-24 | 刘见谷 | Energy saving combustion-supporting device for coal dust combusting |
| SU1550274A1 (en) * | 1988-05-23 | 1990-03-15 | Государственный Научно-Исследовательский Энергетический Институт Им.Г.М.Кржижановского | Method of fuel combustion |
| CN1598401A (en) * | 2003-09-16 | 2005-03-23 | 普莱克斯技术有限公司 | Methode of low nox combustion using cogenerated oxygen and nitrogen streams |
| JP2007190314A (en) * | 2006-01-23 | 2007-08-02 | Teijin Pharma Ltd | Medical oxygen concentrator |
-
2005
- 2005-04-08 CN CNB2005100115415A patent/CN1317526C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4509915A (en) * | 1981-09-21 | 1985-04-09 | Osaka Gas Company Limited | Liquid fuel combustion apparatus |
| CN2038195U (en) * | 1988-05-15 | 1989-05-24 | 刘见谷 | Energy saving combustion-supporting device for coal dust combusting |
| SU1550274A1 (en) * | 1988-05-23 | 1990-03-15 | Государственный Научно-Исследовательский Энергетический Институт Им.Г.М.Кржижановского | Method of fuel combustion |
| CN1598401A (en) * | 2003-09-16 | 2005-03-23 | 普莱克斯技术有限公司 | Methode of low nox combustion using cogenerated oxygen and nitrogen streams |
| JP2007190314A (en) * | 2006-01-23 | 2007-08-02 | Teijin Pharma Ltd | Medical oxygen concentrator |
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| Publication number | Publication date |
|---|---|
| CN1687638A (en) | 2005-10-26 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: China Guodian Fuel Co., Ltd. Assignor: Tsinghua University Contract record no.: 2011110000198 Denomination of invention: Combustion method of fossil fuel and equipment thereof Granted publication date: 20070523 License type: Exclusive License Open date: 20051026 Record date: 20111222 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070523 Termination date: 20140408 |