CN1908515A - Little oil ignition method for circulating fluidized-bed boiler - Google Patents
Little oil ignition method for circulating fluidized-bed boiler Download PDFInfo
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- CN1908515A CN1908515A CN 200610112705 CN200610112705A CN1908515A CN 1908515 A CN1908515 A CN 1908515A CN 200610112705 CN200610112705 CN 200610112705 CN 200610112705 A CN200610112705 A CN 200610112705A CN 1908515 A CN1908515 A CN 1908515A
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Abstract
Disclosed is a little oil ignition method for circulating fluidized-bed boiler. First, initiate the coal fines prefabricated into the scheduled granularity using the raw coal passing through the milling system and obtain the coal fine current. Then lead the coal fine current using the wind pipe into the little oil ignition burner arranged in the boiler duct. The fuel oil system and the compressed air system respectively provide the little oil ignition burner with the little oil and the compressed air. In the little oil ignition burner, the generated high temperature flame burnt by the little oil, ignites the coal fine current and the bed stuff of the circulating fluidized bed boiler using the flaming coal fine current. Because the invention adopts the little oil to ignite the coal fines and ignite the bed stuff of the circulating fluidized bed boiler by the flaming coal fines to replace the oil with coal, realizing a series of slide parameter starting process in the utility boiler cold state initiation such as igniting, lifting pressure, having early load in a small quantity of fuel and the fuel saving ratio is larger than 95%.
Description
Technical field
The present invention relates to a kind of ignition method of boiler, refer to a kind of ignition method of CFBB especially.
Background technology
Along with CFBB maximizes, in the power plant, Circulating Fluidized Bed Boilers installation platform number constantly increases.Amount of nitrogen oxides is low in the emission of CFBB, is easy to remove in combustion process flue gas sulphur oxide gas, thereby realizes the coal-burning boiler low pollution emission.In addition, it is wide that CFBB is suitable for coal, can burning low grade coal, or mix burned coal gangue, utilized the energy in the waste fuel, so CFBB has bright development prospect.
Existing CFBB starting ignition mode comprises: fuel oil starts the in-duct burner of burner, gaseous fuel startup burner and Foster-Wheeler in-duct burner and Babcock ﹠ Wilcox Co. etc.Above-mentioned various starting ignition mode all is combusting liquid fuel or gaseous fuel, and great majority adopt fuel ignitions when wherein large circulating fluidized bed boiler starts; Because to start fuel consumption big for recirculating fluidized bed at every turn, and the CFBB maintenance often, and start and stop are frequent, starts very greatly with oil mass, and international oil price rises in recent years, has strengthened the operating cost of CFBB.
Summary of the invention
At the problems referred to above, the object of the present invention is to provide a kind of fuel-economizing and the CFBB little oil ignition method more safe and reliable, that environmental pollution is little.
For achieving the above object, technical solution of the present invention is:
A kind of CFBB little oil ignition method at first will start with raw coal and be made as the coal dust of prescribed particle size in advance and obtain breeze airflow through pulverized coal preparation system, and breeze airflow is caused the little oil burner of being located in the boiler air channel with airduct.Fuel system and compressed air system are respectively little oil burner micro-fuel oil and compressed air are provided, the thermal-flame firing coal-dust airflow that micro-oil inflame produces in little oil burner is lighted the bed of CFBB and is expected with the breeze airflow of burning.
Further, the granularity of coal dust is 0-120 μ m in the described breeze airflow.
Further, described pulverized coal preparation system comprises disintegrating machine, elevator, coal hopper, feeder and coal-grinding apparatus, start with raw coal after the preliminary fragmentation of disintegrating machine, enter coal-grinding apparatus through elevator, coal hopper, feeder, in coal-grinding apparatus, further grinding of the coal grain after the preliminary fragmentation is the coal dust of suitable particle size.
Further, the air inlet duct of described coal-grinding apparatus is provided with duct insert heater, and air enters coal-grinding apparatus through air blast again behind the duct insert heater heat temperature raising.
Further, described coal-grinding apparatus is a Raymond mill, or the fan mill waits other pulverising apparatus.
Further, described startup is broken again after air-dry with raw coal, and described start-up burner is located at the bed material below of CFBB.
Further, described pulverized coal preparation system is a unit pulverized-coal system, and air is sent into coal-grinding apparatus through the air inlet duct of coal-grinding apparatus, and the coal dust that grinds is blown out, and the coal dust that granularity is qualified behind mill separator and the breeze airflow of air are directly sent into little oil burner.
Further, described pulverized coal preparation system is a bin storage type pulverizing system, through the breeze airflow of qualified coal dust of the isolated granularity of mill separator and air behind the cyclone centrifugal separation device, air separates with coal dust, coal dust after the separation is sent into Pulverized Coal Bin through the secondary flapper, and the coal dust in the Pulverized Coal Bin is through machine supplying powder, with a certain amount of coal dust in blender is sent into airduct, resultant breeze airflow is sent into little oil burner again.
Further, a kind of CFBB is provided with little oil burner in this boiler air channel, and this little oil burner connects pulverized coal preparation system, little oily fuel system and compressed air system.
Further, described little oil burner is made up of little oil gun, oil combustion chamber, firsts and seconds pulverized coal combustor and air film cooling air passage.
After adopting said method, because the present invention adopts a small amount of fuel oil firing coal-dust, light the bed material of CFBB by the coal dust of burning, replace oil with coal, realize lighting a fire, boosting, be with in the station boiler cold start a series of sliding parameter start-up courses such as initial load with a spot of fuel oil, rate of economizing gasoline is more than 95%; In addition, because the air inlet duct of described coal-grinding apparatus is provided with duct insert heater, air enters coal-grinding apparatus through air blast again behind the duct insert heater heat temperature raising, and the coal dust in the coal-grinding apparatus further is dried, and is easier to burning; After adopting this method, in ignition of the boiler, the process of boosting, can throw electric precipitation, guarantee in the boiler startup process, the smoke evacuation qualified discharge reduces environmental pollution, in specific implementation process, design parameter and concrete mechanism do suitable adjustment slightly, promptly applicable to multiple coals such as anthracite, meager coal, bituminous coal, brown coal and colms; And installing igniter and pulverized coal preparation system on the existing equipment basis additional can implement, and scrap build is convenient, easy to operate.
Description of drawings
Fig. 1 is a process equipment flow chart of the present invention;
Fig. 2 is technical process flow process figure of the present invention;
The technology arrangement figure that Fig. 3 arranges down for little oil burner bed among the present invention.
The specific embodiment:
Specify the present invention below:
CFBB little oil ignition method of the present invention may further comprise the steps
As Fig. 1, shown in 2, start and be crushed to predetermined granularity through disintegrating machine 1 with raw coal, deliver to coal hopper 3 through elevator 2, through feeder 4 some is delivered to coal-grinding apparatus 5 through preliminary broken raw coal, described coal-grinding apparatus 5 is provided with air inlet 8, the cold air that enters by air inlet 8, after being located at the duct insert heater 7 heating-up temperatures rising on the air inlet duct, enter coal-grinding apparatus 5 through air blast 14 again, above-mentioned air through heating blows out at the coal dust that coal-grinding apparatus 5 inner drying coal dusts also will grind, deliver to mill separator 6, the underproof coal dust of coarse granule is separated, being transmitted back to coal-grinding apparatus mills once more, qualified fine breeze is that the fine breeze of granularity 0-120 μ m is sent into cyclone separator 9 with air, air is separated with coal dust, air after the separation enters the deduster (not shown), coal dust after the separation is through secondary flapper 10, delivering to Pulverized Coal Bin 11 stores, part coal dust in the Pulverized Coal Bin 11 is delivered to air and powder mixer 13 through machine supplying powder 12, coal dust mixes with air in the airduct in air and powder mixer, forms breeze airflow.Breeze airflow is delivered to the pulverized coal combustor of little oil burner 17 through airduct.Little oil burner 17 is arranged in the air channel 16 of boiler, and air enters air channel 16 by bellows 15, and little oil burner 17 is made up of little oil gun, oil combustion chamber, firsts and seconds pulverized coal combustor and air film cooling air passage.The fuel system of being made up of oil storage tank, filter screen, oil pump, fuel passage, pressure-reducing valve, control valve etc. connects described little oil gun, is little oil gun fuel feeding.The compressed air system of compositions such as air compressor, compressed air cylinder, compressed air piping, control valve provides atomizing medium for little oil gun.As shown in Figure 3, the thermal-flame firing coal-dust airflow that a small amount of fuel oil produces in the oil combustion chamber internal combustion after little oil gun ejection, the hot flue gas after the burning enters air compartment 18, and passes air distribution plate 19, the bed material on heating air distribution plate 19 tops is heated to ignition temperature with the bed material.Described little oil burner 17 also can be arranged at the top of air distribution plate 19.
Described coal-grinding apparatus can be selected Raymond mill, fan mill or steel ball mill for use, and the breeze airflow of described coal dust that granularity is qualified behind mill separator 6 and air, also can directly send into little oil burner.
Described control system comprises high-tension igniton device, flame detecting device, fuel oil quick electric valve, compressed air electromagnetic valve, oil pressure monitoring and compositions such as the monitoring of metallic walls temperature, CCD flame monitoring device and local operation control cabinet.For the scattered control system (DCS) and the burner hearth of generating set protect surveillance (FSSS) that signal and interface are provided.
In addition, establish in addition to start in coal yard and use the coal drying loft, air-dry startup coal makes described breeze airflow be easier to burning.And, can two in actual implementation process boilers or three shared cover pulverized coal preparation systems of boilers, as shown in Figure 2.
Claims (10)
1, a kind of CFBB little oil ignition method, it is characterized in that, at first will start with raw coal and be made as the coal dust of prescribed particle size in advance and obtain breeze airflow through pulverized coal preparation system, breeze airflow is caused the little oil burner of being located in the boiler air channel with airduct, fuel system and compressed air system are respectively little oil burner micro-fuel oil and compressed air are provided, the thermal-flame firing coal-dust airflow that micro-oil inflame produces in little oil burner is lighted the bed of CFBB and is expected with the breeze airflow of burning.
2, CFBB little oil ignition method as claimed in claim 1 is characterized in that, the granularity of coal dust is 0-120 μ m in the described breeze airflow.
3, CFBB little oil ignition method as claimed in claim 2, it is characterized in that, described pulverized coal preparation system comprises disintegrating machine, elevator, coal hopper, feeder and coal-grinding apparatus, start with raw coal after the preliminary fragmentation of disintegrating machine, enter coal-grinding apparatus through elevator, coal hopper, feeder, in coal-grinding apparatus, further grinding of the coal grain after the preliminary fragmentation is the coal dust of suitable particle size.
4, CFBB little oil ignition method as claimed in claim 3 is characterized in that, the air inlet duct of described coal-grinding apparatus is provided with duct insert heater, and air enters coal-grinding apparatus through air blast again behind the duct insert heater heat temperature raising.
5, CFBB little oil ignition method as claimed in claim 4 is characterized in that, described coal-grinding apparatus is a Raymond mill.
6, CFBB little oil ignition method as claimed in claim 1 is characterized in that, described startup is broken again after air-dry with raw coal, and described start-up burner is located at the bed material below of CFBB.
7, CFBB little oil ignition method as claimed in claim 1, it is characterized in that, described pulverized coal preparation system is a unit pulverized-coal system, air is sent into coal-grinding apparatus through the air inlet duct of coal-grinding apparatus, the coal dust that grinds is blown out, the coal dust that granularity is qualified behind mill separator and the breeze airflow of air are directly sent into little oil burner.
8, CFBB little oil ignition method as claimed in claim 1, it is characterized in that, described pulverized coal preparation system is a bin storage type pulverizing system, through the breeze airflow of qualified coal dust of the isolated granularity of mill separator and air behind the cyclone centrifugal separation device, air separates with coal dust, coal dust after the separation is sent into Pulverized Coal Bin through the secondary flapper, coal dust in the Pulverized Coal Bin is through machine supplying powder, with a certain amount of coal dust in blender is sent into airduct, resultant breeze airflow is sent into little oil burner again.
9, a kind of CFBB is characterized in that, is provided with little oil burner in this boiler air channel, and this little oil burner connects pulverized coal preparation system, fuel system and compressed air system.
10, CFBB as claimed in claim 9 is characterized in that, described little oil burner is made up of little oil gun, oil combustion chamber, firsts and seconds pulverized coal combustor and air film cooling air passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101127058A CN100422638C (en) | 2006-08-30 | 2006-08-30 | Little oil ignition method for circulating fluidized-bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101127058A CN100422638C (en) | 2006-08-30 | 2006-08-30 | Little oil ignition method for circulating fluidized-bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN1908515A true CN1908515A (en) | 2007-02-07 |
| CN100422638C CN100422638C (en) | 2008-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101127058A Expired - Fee Related CN100422638C (en) | 2006-08-30 | 2006-08-30 | Little oil ignition method for circulating fluidized-bed boiler |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189024A (en) * | 2010-03-01 | 2011-09-21 | 大唐华银株洲发电有限公司 | Compound pulverizing system based on coal pulverizer |
| CN103115357A (en) * | 2013-01-17 | 2013-05-22 | 向家莹 | Circulating fluidized bed fire coal (waste incineration) boiler oxygen enrichment pulverized coal igniting steady burning device |
| CN104913325A (en) * | 2015-06-30 | 2015-09-16 | 广东电网有限责任公司电力科学研究院 | Combustion control method of boiler |
| CN107702092A (en) * | 2017-10-26 | 2018-02-16 | 南京泰润电力工程有限公司 | A kind of CFBB starts technique |
| CN113091327A (en) * | 2021-04-06 | 2021-07-09 | 丁胜 | Electric boiler system and electric boiler control method |
| CN113915608A (en) * | 2021-10-20 | 2022-01-11 | 大唐湘潭发电有限责任公司 | Blow-in oil-saving method for front-back wall opposed combustion type unit |
-
2006
- 2006-08-30 CN CNB2006101127058A patent/CN100422638C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189024A (en) * | 2010-03-01 | 2011-09-21 | 大唐华银株洲发电有限公司 | Compound pulverizing system based on coal pulverizer |
| CN102189024B (en) * | 2010-03-01 | 2013-03-06 | 大唐华银株洲发电有限公司 | Compound pulverizing system based on coal pulverizer |
| CN103115357A (en) * | 2013-01-17 | 2013-05-22 | 向家莹 | Circulating fluidized bed fire coal (waste incineration) boiler oxygen enrichment pulverized coal igniting steady burning device |
| CN104913325A (en) * | 2015-06-30 | 2015-09-16 | 广东电网有限责任公司电力科学研究院 | Combustion control method of boiler |
| CN104913325B (en) * | 2015-06-30 | 2017-10-27 | 广东电网有限责任公司电力科学研究院 | The method for controlling combustion of boiler |
| CN107702092A (en) * | 2017-10-26 | 2018-02-16 | 南京泰润电力工程有限公司 | A kind of CFBB starts technique |
| CN113091327A (en) * | 2021-04-06 | 2021-07-09 | 丁胜 | Electric boiler system and electric boiler control method |
| CN113091327B (en) * | 2021-04-06 | 2022-06-17 | 丁胜 | Electric boiler system and electric boiler control method |
| CN113915608A (en) * | 2021-10-20 | 2022-01-11 | 大唐湘潭发电有限责任公司 | Blow-in oil-saving method for front-back wall opposed combustion type unit |
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| Publication number | Publication date |
|---|---|
| CN100422638C (en) | 2008-10-01 |
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Effective date of registration: 20120105 Address after: 100085, Beijing, Haidian District, 5 East Road,, Mongolia hi tech room Patentee after: Aipeix Sci. & Tech, (Beijing) Co., Ltd. Address before: 100085, Beijing, Haidian District, 5 East Road,, Mongolia hi tech room Patentee before: Guo Xiufeng |
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