CN102927582A - Bin storage type hot air powder-feeding tertiary-air-free combustion system - Google Patents
Bin storage type hot air powder-feeding tertiary-air-free combustion system Download PDFInfo
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- CN102927582A CN102927582A CN2012104332219A CN201210433221A CN102927582A CN 102927582 A CN102927582 A CN 102927582A CN 2012104332219 A CN2012104332219 A CN 2012104332219A CN 201210433221 A CN201210433221 A CN 201210433221A CN 102927582 A CN102927582 A CN 102927582A
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Abstract
Provided is a bin storage type hot air powder-feeding tertiary-air-free combustion system. The powder return amount and circulating magnification are monitored through a pulverizing system coarse powder separator (3), the ventilation quantity of a coal mill (2) is adjusted, tertiary air (7) is optimized, and tertiary air originally introduced from the upper portion of a hearth is abandoned, the introducing position is replaced a small cloth bag type dust collector (8), separated fine coal powder is utilized fully and participates in primary-air combustion, discharged clean gas is directly discharged into the atmosphere after the small cloth bag type dust collector performs filtering, and the tertiary air is prevented from being discharging into a boiler and influencing the safety and economical efficiency of the combustion. Therefore, by means of the technical measure, the bin storage type hot air powder-feeding tertiary-air-free combustion system has the advantages of (1) being stable in combustion; (2) remarkably reducing flying ash combustibles; (3) reducing the temperature of discharged smoke and enabling the boiler efficiency to be improved remarkably while reducing or eradicating an extinguishment phenomenon.
Description
Technical field
The present invention relates to a kind of warehouse formula pulverized coal carried by hot air without the tertiary air combustion system, improve the technical field of boiler combustion efficiency.
Background technology
The most pulverized-coal fired boilers in the thermal power plant of China extensively adopt warehouse formula pulverized coal carried by hot air system, go out pulverized-coal collector top and extract the weary gas that carries the small part very fine coal and be called tertiary air, and go out mill exhauster and directly send into the tertiary air nozzles of upper furnace and participate in burning.Tertiary air is usually placed in the superiors of burner, is furnished with primary and secondary air under it.The air quantity of tertiary air is about 15～20% of total blast volume, wherein contains 10～15% particulate coal dust.The characteristics of tertiary air are that temperature is low, and moisture is large, and coal dust is thin.Take the power plant of a certain 300MW burning meager coal as example, the relation of one, two, three wind such as following table:
| Project | Wind rate (%) | Wind speed (m/s) | Wind-warm syndrome (℃) | Resistance (Pa) |
| A wind | 19 | 24 | 229.9 | 1000 |
| Secondary Air | 48.6 | 45 | 336 | 1300 |
| Tertiary air | 20.8 | 50 | 96 | 2400 |
Operating experience shows, the employing of tertiary air has obvious adverse effect to the stability of boiler combustion and the economy of boiler combustion: 1, make the furnace flame temperature reduce combustion instability; When 2, tertiary air quantity was larger, wind speed also increased, and easily upset the normal air flow field of boiler, caused that flame pastes the wall slagging scorification; 3, tertiary air is injected at a high speed, and the flame residual rotation is increased, and fly ash combustible material increases simultaneously; 4, flame is spun out, and furnace outlet gas temperature raises, and exhaust gas temperature raises, and makes the superheater and reheater overtemperature, and the steam temperature amplitude of accommodation increases.
The purpose of invention
In order to solve the ubiquitous combustion instability of existing warehouse formula pulverized coal carried by hot air system, need to throw the problems such as oil companion burning, exhaust gas temperature rising, unburned carbon in flue dust increase, a kind of warehouse formula pulverized coal carried by hot air has been proposed without the tertiary air combustion system.
The content of invention
For solving above technical problem, take the 1025t/h coal-burning boiler as example: the burner hearth (14) with 5 layers of wind master nozzles (13), establishing 4 main nozzles diagonal angles for every layer arranges, arrange at the diagonal angle, top of last layer master nozzles and to introduce tertiary air, take following technology reforming scheme: cancel the tertiary air that introduce on former cause burner hearth (14) top, change into and introduce the small-sized cloth bag (8) that is arranged on the Pulverized Coal Bin (10), entrained fine particle in the tertiary air (7) separated enter Pulverized Coal Bin, directly send into hearth combustion by rotation air-locked type machine supplying powder (11) and monitoring powder-feeding amount device (12), cleaning tertiary air after filtering can directly discharged to atmosphere, have been avoided the adverse effect to boiler combustion.
Its useful effect is: by pulverized coal preparation system mill separator (3) Hui Fenliang monitoring circulating ratio, adjust the ventilation of coal pulverizer (2), reduce tertiary air (7) amount, and cancel the tertiary air that former cause upper furnace is introduced, change and introduce the position to small-sized cloth bag (8), fine breeze under separating enters Pulverized Coal Bin and takes full advantage of, participate in a wind burning, the cleaning tertiary air of discharging after small-sized cloth bag filters is directly discharged to atmosphere, avoid tertiary air to enter burner hearth (14) and affect the safety and economy of boiler combustion, such technical measures institute produce an effect is very obvious: 1) smooth combustion; 2) fly ash combustible material significantly reduces; 3) exhaust gas temperature reduces; When reducing or stopping to put out a fire, make boiler efficiency occur improving greatly.
Description of drawings
Below in conjunction with drawings and embodiments, warehouse formula pulverized coal carried by hot air is described further without the tertiary air combustion system.
Accompanying drawing is: the schematic diagram of 1025t/h coal-burning boiler warehouse formula pulverized coal carried by hot air without the tertiary air combustion system of giving an example:
1. hot air duct 2. low speed coal mills 3. mill separators 4. are monitored back 13. wind masters of powder amount device 5. pulverized-coal collector 6. Powder discharging fans, 7. tertiary air 8. small-sized cloth bags, 9. monitoring powder falling amount device 10. Pulverized Coal Bin, 11. rotation air-locked type machine supplying powder 12. monitoring powder-feeding amount devices nozzles, 14. burner hearths
Concrete embodiment
The tertiary air that realization of the present invention only needs former cause burner hearth (14) top is introduced is cancelled, change into and enter the small-sized cloth bag (8) that is arranged on the Pulverized Coal Bin (10), the fine breeze that carries in the tertiary air (7) separated send in the Pulverized Coal Bin, again by rotation air-locked type machine supplying powder (11) with monitor powder falling amount device (12) and directly enter hearth combustion.The retrofit work amount is little, and small investment only need install small-sized cloth bag additional, removes section of tubing and air door.Therefore, the present invention has stronger realistic meaning, will produce considerable social benefit and economic benefit once using.
Claims (2)
1. a warehouse formula pulverized coal carried by hot air is without the tertiary air combustion system, it is characterized in that: in Pulverized Coal Bin (10) small-sized sack cleaner (8) is set, the tertiary air (7) of Powder discharging fan outlet is introduced small-sized sack cleaner, fine powder separated fall into Pulverized Coal Bin, directly introduce burner hearth (14) burning by wind master nozzles (13), cleaning tertiary air after filtering can be directly discharged to atmosphere.
2. arrange in the powder retrieving pipe road of mill separator (3) and monitor back powder amount device (4), can monitor Hui Fenliang and the circulating ratio thereof of mill separator (3), optimize ventilation and the tertiary air quantity (7) thereof of coal pulverizer (2) and Powder discharging fan (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104332219A CN102927582A (en) | 2012-11-05 | 2012-11-05 | Bin storage type hot air powder-feeding tertiary-air-free combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104332219A CN102927582A (en) | 2012-11-05 | 2012-11-05 | Bin storage type hot air powder-feeding tertiary-air-free combustion system |
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| CN102927582A true CN102927582A (en) | 2013-02-13 |
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| CN2012104332219A Pending CN102927582A (en) | 2012-11-05 | 2012-11-05 | Bin storage type hot air powder-feeding tertiary-air-free combustion system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104676628A (en) * | 2013-12-03 | 2015-06-03 | 吉林省电力科学研究院有限公司 | Intelligent distribution system for medium-speed coal mill |
| CN105032890A (en) * | 2015-07-07 | 2015-11-11 | 义马环保电力有限公司 | Barium slag processing system and method |
| CN105039726A (en) * | 2015-07-07 | 2015-11-11 | 义马环保电力有限公司 | Chromium slag processing method |
| CN108980822A (en) * | 2018-07-27 | 2018-12-11 | 常州市新港热电有限公司 | A kind of low nitrogen burning coal-powder boiler and low nitrogen burning method |
| CN109772569A (en) * | 2019-01-28 | 2019-05-21 | 常州市长江热能有限公司 | A kind of pulverized coal preparation system |
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| CN1738992A (en) * | 2002-12-11 | 2006-02-22 | 阿尔斯托姆(瑞士)有限公司 | Indirect heating system with upgrading of ultra-fine fuel particles |
| CN201339948Y (en) * | 2009-01-09 | 2009-11-04 | 宋军保 | Pulverized coal preparation system |
| CN201764529U (en) * | 2009-11-06 | 2011-03-16 | 孙家鼎 | Online real-time powder flow monitoring system |
| CN202132968U (en) * | 2011-07-20 | 2012-02-01 | 上海机易电站设备有限公司 | Smoke drying steel ball brown-coal milling system |
| CN202195493U (en) * | 2011-06-20 | 2012-04-18 | 上海机易电站设备有限公司 | Medium-speed milling pulverization system for flue gas-dried lignite |
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2012
- 2012-11-05 CN CN2012104332219A patent/CN102927582A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1738992A (en) * | 2002-12-11 | 2006-02-22 | 阿尔斯托姆(瑞士)有限公司 | Indirect heating system with upgrading of ultra-fine fuel particles |
| CN201339948Y (en) * | 2009-01-09 | 2009-11-04 | 宋军保 | Pulverized coal preparation system |
| CN201764529U (en) * | 2009-11-06 | 2011-03-16 | 孙家鼎 | Online real-time powder flow monitoring system |
| CN202195493U (en) * | 2011-06-20 | 2012-04-18 | 上海机易电站设备有限公司 | Medium-speed milling pulverization system for flue gas-dried lignite |
| CN202132968U (en) * | 2011-07-20 | 2012-02-01 | 上海机易电站设备有限公司 | Smoke drying steel ball brown-coal milling system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104676628A (en) * | 2013-12-03 | 2015-06-03 | 吉林省电力科学研究院有限公司 | Intelligent distribution system for medium-speed coal mill |
| CN105032890A (en) * | 2015-07-07 | 2015-11-11 | 义马环保电力有限公司 | Barium slag processing system and method |
| CN105039726A (en) * | 2015-07-07 | 2015-11-11 | 义马环保电力有限公司 | Chromium slag processing method |
| CN105032890B (en) * | 2015-07-07 | 2017-06-06 | 义马环保电力有限公司 | Barium slag disposal system and processing method |
| CN108980822A (en) * | 2018-07-27 | 2018-12-11 | 常州市新港热电有限公司 | A kind of low nitrogen burning coal-powder boiler and low nitrogen burning method |
| CN109772569A (en) * | 2019-01-28 | 2019-05-21 | 常州市长江热能有限公司 | A kind of pulverized coal preparation system |
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Application publication date: 20130213 |