CN102494340A - Pulverized coal high-temperature oxygen ignition method and device - Google Patents
Pulverized coal high-temperature oxygen ignition method and device Download PDFInfo
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- CN102494340A CN102494340A CN2011104245979A CN201110424597A CN102494340A CN 102494340 A CN102494340 A CN 102494340A CN 2011104245979 A CN2011104245979 A CN 2011104245979A CN 201110424597 A CN201110424597 A CN 201110424597A CN 102494340 A CN102494340 A CN 102494340A
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- temperature oxygen
- pulverized coal
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- breeze airflow
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Abstract
In order to reduce the ignition cost of a pulverized coal boiler and improve the safety and stability during the ignition process, the invention provides a pulverized coal high-temperature oxygen ignition method and a pulverized coal high-temperature oxygen ignition device both applied to ignition of pulverized coal burners. The pulverized coal high-temperature oxygen ignition method has the following steps: enabling high-concentration pulverized coal airflow to blow from a pulverized coal airflow passage in a straight-through manner; and blowing high-temperature oxygen higher than 800 DEG C from a high-temperature oxygen passage and mixing the high-temperature oxygen with the pulverized coal airflow. The pulverized coal high-temperature oxygen ignition device includes a central pipe pulverized coal airflow passage and a high-temperature oxygen annular passage sleeved outside the central pipe pulverized coal airflow passage, wherein the high-temperature oxygen annular passage is communicated with a high-temperature oxygen air room. The pulverized coal high-temperature oxygen ignition method provided by the invention can be widely used in the ignition of various pulverized coal burners, is simple to operate, convenient to use and excellent in ignition effect; and the pulverized coal high-temperature oxygen ignition device provided by the invention is an oilless ignition device, and needs no special ignition fuel such as fuel oil during the operation, thereby effectively reducing the ignition cost of pulverized coal boilers.
Description
Technical field
The present invention relates to a kind of coal fines high-temperature oxygen ignition method and igniter that is applied to the coal burner igniting.
Background technology
At present, conventional pulverized-coal fired boiler is to adopt the mode of fuel oil to realize the igniting of coal burner mostly.This mode is to serve as the main igniting energy with specific fuel oil.In ignition process, at first light fuel oil through special igniter, utilize the heat of the oil inflame breeze airflow that ignites then, realize the igniting of coal burner.The major defect of this mode is: in the steady combustion process after the igniting of coal burner reaches, need to consume a large amount of fuel oils, financial cost is huge; Special igniter need be set be used to light the fuel oil oil gun, and igniter and fuel oil oil gun exist in design size and the mounting means that has restricted burner to a certain extent, increased relevant cost.
Summary of the invention
In order effectively to reduce the igniting cost of pulverized-coal fired boiler, improve the security and the stability of ignition process, the present invention has designed a kind of coal fines high-temperature oxygen ignition method and device that is applied to the coal burner igniting.It utilizes main heat and the combustion adjuvant source of high-temperature oxygen as pulverized coal ignition.During operation, at first the direct mixing of a secondary wind high-temperature oxygen through igniter and the wind breeze airflow breeze airflow that ignites is realized the igniting of igniter self, lights whole coal burner through the oxygen-enriched combusting thermal-flame of igniter then.In the whole ignition process of coal burner, need not use fuel oil fully, and after burner was lighted, the secondary wind high-temperature oxygen of igniter can directly be replaced by common secondary wind air.
Said purpose realizes through following scheme:
The breeze airflow that a kind of coal fines high-temperature oxygen ignition method, concentration are higher than 0.6kgC/kgA blows out from the breeze airflow passage with the mode of direct current; Blow out through the high-temperature oxygen passage greater than 800 ℃ high-temperature oxygens, mix mutually, get final product with breeze airflow.
Form 15～25 ° angle between said high concentration pulverized coal air-flow and the high-temperature oxygen air-flow.
Said high-temperature oxygen blows out from the high-temperature oxygen passage with cyclone mode.
Said high-temperature oxygen swirl strength is 2.0～2.5.
Light the igniter breeze airflow through high-temperature oxygen; The igniting that is igniter self is the key of whole coal burner ignition process; Simultaneously also be the main difficult point of coal fines high-temperature oxygen igniter design: the calculating according to the coal dust theoretical temperature combustion can be known; The ignition temperature of coal dust under excess oxygen is very high, even can reach nearly 3000 ℃, so in the design of igniter, should not adopt pre-burning/mixed cell structure; In addition; Guaranteeing under the identical prerequisite of oxygen-supplying amount; Use comburant oxygen to compare with using air-breathing, the combustion-supporting gas amount significantly reduces, and the gas density that very high in addition gas heating-up temperature causes descends, the adverse effect of gas penetration mixed variation; Want to guarantee fully mixing of breeze airflow and high-temperature oxygen, and then the igniting that successfully realizes igniter self the quite difficulty that becomes.
To above-described problem, adopted center wind air direct current powder feeding, outside loop swirl-flow that the basic structure of secondary wind high-temperature oxygen is provided in the design of coal fines high-temperature oxygen igniter of the present invention.In addition, the place is provided with deflection cone at a wind breeze airflow of central tube passage spout, in order to strengthen mixing of breeze airflow and outside eddy flow high-temperature oxygen.Concrete structure is:
A kind of coal fines high-temperature oxygen igniter comprises central tube breeze airflow passage and the high-temperature oxygen circular passage that is socketed in the outside, and said high-temperature oxygen circular passage is communicated with the high-temperature oxygen air compartment.
Said central tube breeze airflow channel exit is set to the enlarging structure, and the outer tube wall in exit, said high-temperature oxygen circular passage is the enlarging structure.
The center of said central tube breeze airflow channel exit is provided with deflection cone, and deflection cone is the little outer big normal cone in lining.
The height of said deflection cone is consistent with central tube breeze airflow passage flared section length, and the position is concordant with the enlarging of central tube breeze airflow.
The angle of central tube breeze airflow passage enlarging half-angle α is 15～25 °; The angle of high-temperature oxygen passage enlarging half-angle β is 20～25 °.
Exit, said high-temperature oxygen circular passage is fixed with high-temperature oxygen eddy flow impeller.
Coal fines high-temperature oxygen ignition method according to the invention can be widely used in the ignition process of all kinds of coal burners, and it is simple to operate, and is easy to use, and it is effective to light a fire.Coal fines high-temperature oxygen igniter according to the invention is a kind of non-oil ignition device, does not need special igniter fuels such as fuel oil in the running, has reduced the igniting cost of pulverized-coal fired boiler effectively; Through changing a wind breeze airflow of igniter speed, secondary wind speed and swirl strength, can effectively adjust the flow field, the fire location of control breeze airflow guarantees the igniting and steady combustion of breeze airflow; After coal burner was lighted, the secondary wind high-temperature oxygen of igniter can directly be replaced by common secondary wind air, and promptly igniter can change a small-sized conventional vortex burner into and participates in the operation of boiler.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Reference numeral: 1, central tube breeze airflow passage; 2, high-temperature oxygen air compartment; 3, high-temperature oxygen circular passage; 4, high-temperature oxygen eddy flow impeller; 5, high-temperature oxygen passage enlarging; 6, central tube breeze airflow passage enlarging; 7, deflection cone.F
1Be a wind breeze airflow, F
2Be the high temperature oxygen air-flow.
The specific embodiment
Set forth the preferred embodiment of the present invention in detail below in conjunction with accompanying drawing.
The breeze airflow that a kind of coal fines high-temperature oxygen ignition method, concentration are higher than 0.6kgC/kgA blows out from the breeze airflow passage with the mode of direct current, greater than 800 ℃ high-temperature oxygens with intensity after 2.0～2.5 cyclone mode blows out through the high-temperature oxygen passage; Mix mutually with breeze airflow with 15～25 ° angles, along with the carrying out that mixes, the oxygen volume share in the breeze airflow constantly increases; The ignition temperature of corresponding pulverized coal particle constantly descends; Meanwhile breeze airflow is by constantly heating, and temperature constantly raises, up to the ignition temperature that reaches breeze airflow; Breeze airflow is lighted, and finally realizes the igniting of igniter self.Afterwards, just can light whole coal burner, and after burner was lighted, the secondary wind high-temperature oxygen of igniter can directly be replaced by common secondary wind air through the oxygen-enriched combusting thermal-flame of igniter.
Be to realize preceding method, the present invention has adopted coal fines high-temperature oxygen igniter, with reference to Fig. 1, it structurally by 1, central tube breeze airflow passage; 2, high-temperature oxygen air compartment; 3, high-temperature oxygen circular passage; 4, high-temperature oxygen eddy flow impeller; 5, high-temperature oxygen passage enlarging; 6, central tube breeze airflow passage enlarging; 7, deflection cone is formed.When reality was used, air quantity, wind speed that the sectional dimension of each passage is passed through by its correspondence calculated;
Concrete structure does, with reference to Fig. 1, central tube breeze airflow passage is the passage that is used for the pulverized coal conveying air-flow, and the high-temperature oxygen circular passage is the passage that is used to carry high-temperature oxygen.The high-temperature oxygen circular passage is enclosed within outside the central tube breeze airflow passage, and said high-temperature oxygen circular passage is communicated with the high-temperature oxygen air compartment.
Said central tube breeze airflow channel exit is set to the enlarging structure, and the angle of enlarging half-angle α is 15～25 °; Enlarging place is provided with deflection cone, and deflection cone is the little outer big normal cone in lining, and the height of deflection cone is consistent with flared section length, and the position is concordant with enlarging.
The outer tube wall in exit, said high-temperature oxygen circular passage is the enlarging structure, and the angle of enlarging half-angle β is 20～25 °, also is fixed with high-temperature oxygen eddy flow impeller in the exit.
The concrete running of coal fines high-temperature oxygen igniter according to the invention is: at first, and a wind breeze airflow F
1Blow out with the mode of directly blowing from central tube breeze airflow passage 1, and in the acting in conjunction of deflection cone 7 and central tube breeze airflow passage enlarging 6 along certain angle to external diffusion; Meanwhile, high temperature oxygen air-flow F
2Blow out with cyclone mode through high-temperature oxygen air compartment 2, high-temperature oxygen circular passage 3 and high-temperature oxygen eddy flow impeller 4, and under the guide functions of high-temperature oxygen passage enlarging 5, in the flow field, form the recirculating zone, a wind breeze airflow F who blows out with central tube
1Mix mutually; Along with the carrying out that mixes, the oxygen volume share of mixed airflow constantly increases, temperature constantly raises, and up to the ignition temperature that reaches breeze airflow, breeze airflow is lighted, and igniter is successfully lighted a fire.Afterwards, just can light whole coal burner through the oxygen-enriched combusting thermal-flame of igniter.After whole coal burner is lighted, can be with high temperature oxygen air-flow F
2Replace with common combustion-supporting secondary wind air, igniter changes a small-sized conventional vortex burner into participates in the operation of boiler.
This embodiment is the protection domain that the exemplary illustration of this patent is not limited it; Those skilled in the art can also carry out the part to it and change; The short of spirit that exceeds this patent all is regarded as the replacement that is equal to this patent, all within the protection domain of this patent.
Claims (10)
1. coal fines high-temperature oxygen ignition method is characterized in that: the breeze airflow that concentration is higher than 0.6kgC/kgA blows out from the breeze airflow passage with the mode of direct current; Blow out through the high-temperature oxygen passage greater than 800 ℃ high-temperature oxygens, mix mutually, get final product with breeze airflow.
2. coal fines high-temperature oxygen ignition method according to claim 1 is characterized in that forming 15～25 ° angle between said high concentration pulverized coal air-flow and the high-temperature oxygen air-flow.
3. coal fines high-temperature oxygen ignition method according to claim 1 and 2 is characterized in that said high-temperature oxygen blows out from the high-temperature oxygen passage with cyclone mode.
4. coal fines high-temperature oxygen ignition method according to claim 3 is characterized in that said high-temperature oxygen swirl strength is 2.0～2.5.
5. a coal fines high-temperature oxygen igniter is characterized in that comprising central tube breeze airflow passage and the high-temperature oxygen circular passage that is socketed in the outside, and said high-temperature oxygen circular passage is communicated with the high-temperature oxygen air compartment.
6. coal fines high-temperature oxygen igniter according to claim 5 is characterized in that said central tube breeze airflow channel exit is set to the enlarging structure, and the outer tube wall in exit, said high-temperature oxygen circular passage is the enlarging structure.
7. coal fines high-temperature oxygen igniter according to claim 6 is characterized in that the center of said central tube breeze airflow channel exit is provided with deflection cone, and deflection cone is the little outer big normal cone in lining.
8. coal fines high-temperature oxygen igniter according to claim 7 is characterized in that the height of said deflection cone is consistent with central tube breeze airflow passage flared section length, and the position is concordant with the enlarging of central tube breeze airflow.
9. coal fines high-temperature oxygen igniter according to claim 6 is characterized in that the angle of central tube breeze airflow passage enlarging half-angle α is 15～25 °; The angle of high-temperature oxygen passage enlarging half-angle β is 20～25 °.
10. according to any described coal fines high-temperature oxygen igniter of claim 5-9, it is characterized in that exit, said high-temperature oxygen circular passage is fixed with the high-temperature oxygen eddy flow.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104245979A CN102494340A (en) | 2011-12-16 | 2011-12-16 | Pulverized coal high-temperature oxygen ignition method and device |
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| CN2011104245979A CN102494340A (en) | 2011-12-16 | 2011-12-16 | Pulverized coal high-temperature oxygen ignition method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444167A (en) * | 2015-12-30 | 2016-03-30 | 上海华之邦科技股份有限公司 | Internal mixing type bubble atomization oil gun |
| CN106765074A (en) * | 2016-11-09 | 2017-05-31 | 贾泽春 | A kind of coal dust circulation vertical line combustion flame generator |
| CN107763663A (en) * | 2016-08-23 | 2018-03-06 | 翼特新能源科技（上海）有限公司 | Solid fuel combustion apparatus and its application method |
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| JPH0226112A (en) * | 1988-07-14 | 1990-01-29 | Nec Corp | Bias supplying element |
| CN2080615U (en) * | 1990-12-28 | 1991-07-10 | 国家建筑材料工业局南京水泥工业设计研究院 | Two-way duct powder coal burner for cement rotating cylindrical kiln |
| US5365865A (en) * | 1991-10-31 | 1994-11-22 | Monro Richard J | Flame stabilizer for solid fuel burner |
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| CN101799172A (en) * | 2010-03-02 | 2010-08-11 | 哈尔滨工业大学 | High-temperature oxygen-rich coal dust grading ignition device |
| CN201866760U (en) * | 2010-07-23 | 2011-06-15 | 烟台龙源电力技术股份有限公司 | Pulverized coal burner |
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2011
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0226112A (en) * | 1988-07-14 | 1990-01-29 | Nec Corp | Bias supplying element |
| CN2080615U (en) * | 1990-12-28 | 1991-07-10 | 国家建筑材料工业局南京水泥工业设计研究院 | Two-way duct powder coal burner for cement rotating cylindrical kiln |
| US5365865A (en) * | 1991-10-31 | 1994-11-22 | Monro Richard J | Flame stabilizer for solid fuel burner |
| CN101424398A (en) * | 2008-03-06 | 2009-05-06 | 郑平安 | Concentrated phase high-temperature oxygen-enriched oilless ignition combustion apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444167A (en) * | 2015-12-30 | 2016-03-30 | 上海华之邦科技股份有限公司 | Internal mixing type bubble atomization oil gun |
| CN107763663A (en) * | 2016-08-23 | 2018-03-06 | 翼特新能源科技（上海）有限公司 | Solid fuel combustion apparatus and its application method |
| CN106765074A (en) * | 2016-11-09 | 2017-05-31 | 贾泽春 | A kind of coal dust circulation vertical line combustion flame generator |
| CN106765074B (en) * | 2016-11-09 | 2018-12-14 | 贾泽春 | A kind of coal dust circulation vertical line combustion flame generator |
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Application publication date: 20120613 |