CN202973142U - Intermediate silo-type hot-air powder feeding burning tertiary-air-free system - Google Patents
Intermediate silo-type hot-air powder feeding burning tertiary-air-free system Download PDFInfo
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- CN202973142U CN202973142U CN 201220620806 CN201220620806U CN202973142U CN 202973142 U CN202973142 U CN 202973142U CN 201220620806 CN201220620806 CN 201220620806 CN 201220620806 U CN201220620806 U CN 201220620806U CN 202973142 U CN202973142 U CN 202973142U
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- air
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- tertiary
- coal
- pulverized coal
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Abstract
An intermediate silo-type hot-air powder feeding burning tertiary-air-free system is characterized in that the powder return volume and the circulation ratio can be monitored through a powder returning volume monitoring device (4) of a coarse powder separator (3) of a powder making system, the ventilation quantity of a coal mill (2) is adjusted, the exhaust volume is reduced, the original tertiary air draught from the upper part of a hearth (10) is canceled, an original fine powder separator is canceled, the draught position of the tertiary air is changed to a bag-type dust remover (5), the separated coal powder falls into a coal powder cabin (7) to be adequately utilized and enters a furnace to be burned through a primary air main fire nozzle (11), the clean air which is filtered by the bag-type dust remover is directly exhausted to the atmosphere, and the tertiary air can be prevented from entering the hearth (10) to produce the adverse effect on a boiler. The intermediate silo-type hot-air powder feeding burning tertiary-air-free system has the beneficial effects that (1) stability in burning is realized; (2) combustible substances in the fly ash can be greatly reduced; and (3) the temperature of the exhausted smoke is reduced; and the boiler efficiency is greatly improved while the fire extinguishing is reduced or prevented.
Description
Technical field
The utility model relates to the burning of a kind of middle warehouse formula pulverized coal carried by hot air without the tertiary air system, belongs to the technical field that improves boiler combustion efficiency.
Background technology
The thermal power plant of China, warehouse formula pulverized coal carried by hot air combustion system in the middle of most pulverized-coal fired boilers extensively adopt, in pulverized coal preparation system, pulverized-coal collector top extracts the weary gas that carries the particulate coal dust, directly sends into upper furnace tertiary air nozzles by mill exhauster and participates in burning, is called tertiary air.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 total blast volume
Wherein contain
The 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 stability and the boiler economy of boiler combustion: the furnace flame temperature is reduced, combustion instability; 2, tertiary air quantity is larger, and wind speed also increases, and easily upsets the normal air flow field of boiler, causes 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, sometimes need to throw the problems such as oil companion burning, exhaust gas temperature rising, unburned carbon in flue dust increase, the burning of a kind of middle warehouse formula pulverized coal carried by hot air has been proposed without the tertiary air system.
The content of invention
for solving above technical problem, take the 1025t/h coal-burning boiler as example: to have the burner hearth (10) of 5 layers of wind master nozzles (11), establishing 4 main nozzles diagonal angles for every layer arranges, arrange at the diagonal angle, top of last layer master nozzles and introduce tertiary air, take following technology reforming scheme: the tertiary air of cancelling former cause burner hearth (10) top introducing, change into and enter the fiber bag precipitator (5) that is arranged on Pulverized Coal Bin (7), the coal dust that pulverized coal making system gas is entrained, collect by fiber bag precipitator the coal dust that gets off and fall into Pulverized Coal Bin (7), pure qi (oxygen) after filtering is directly discharged to atmosphere, avoided weary gas to the adverse effect of boiler combustion.
the beneficial effects of the utility model are: Hui Fenliang and the circulating ratio thereof of powder amount device (4) monitoring mill separator returned in the monitoring of the mill separator (3) by pulverized coal preparation system, adjust coal pulverizer (2) ventilation, reduce its ventilation, and cancel the tertiary air that former cause upper furnace is introduced, change and introduce the position to fiber bag precipitator (5), coal dust under separating falls into Pulverized Coal Bin, supply with boiler combustion, pure qi (oxygen) after fiber bag precipitator gathers dust filtration is directly discharged to atmosphere, avoid tertiary air to enter boiler and affect the safety and economy of boiler combustion, the pulverized-coal collector that replaces former pulverized coal preparation system with fiber bag precipitator, make efficiency of dust collection bring up to 99.99%, the compact Layout of while Powder discharging fan, metal wastage and power consumption have been reduced, it is very obvious adopting above technical measures institutes produce an effect: 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, system is described further to middle warehouse formula pulverized coal carried by hot air Combustion Energy win.
Accompanying drawing is that in the middle of the 1025t/h coal-burning boiler, warehouse formula pulverized coal carried by hot air burns without the schematic diagram of tertiary air system:
1. hot air duct 2. low speed coal mill 3. mill separators 4. are monitored back powder amount device 5. fiber bag precipitator 6. Powder discharging fan 7. Pulverized Coal Bin 8. rotation air-locked type machine supplying powders 9. and are monitored back 11. wind master nozzles of powder amount device 10. burner hearth
Concrete embodiment
Realization of the present utility model only needs the tertiary air of former cause burner hearth (10) top introducing is cancelled, change into and enter the fiber bag precipitator (5) that is arranged on Pulverized Coal Bin (7) top, the coal dust amount of pulverized coal preparation system is separated enter Pulverized Coal Bin, the weary gas after filtration directly enters atmosphere.The retrofit work amount is little, and small investment only needs to remove original pulverized-coal collector and section of tubing air door in pulverized coal preparation system, install fiber bag precipitator additional and get final product the completing technology retrofit work, therefore, the present invention has stronger realistic meaning, will produce considerable social benefit and economic benefit once using.
Claims (2)
1. middle warehouse formula pulverized coal carried by hot air burning is without the tertiary air system, it is characterized in that: the pulverized-coal collector of cancelling original pulverized coal preparation system, replace with being arranged in the upper sack cleaner (5) that arranges of Pulverized Coal Bin (7), Powder discharging fan (6) attracts the primary mixture of pulverized coal preparation system directly to introduce sack cleaner, coal dust is separated fall into Pulverized Coal Bin, directly introduce burner hearth (10) burning by wind master nozzles (11), the clean weary gas of powder process after filtering is directly discharged to atmosphere.
2. middle warehouse formula pulverized coal carried by hot air according to claim 1 burning is without the tertiary air system, it is characterized in that: arrange on 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), adjust the ventilation of coal pulverizer (2) and Powder discharging fan (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220620806 CN202973142U (en) | 2012-11-22 | 2012-11-22 | Intermediate silo-type hot-air powder feeding burning tertiary-air-free system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220620806 CN202973142U (en) | 2012-11-22 | 2012-11-22 | Intermediate silo-type hot-air powder feeding burning tertiary-air-free system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202973142U true CN202973142U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220620806 Expired - Fee Related CN202973142U (en) | 2012-11-22 | 2012-11-22 | Intermediate silo-type hot-air powder feeding burning tertiary-air-free system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279575A (en) * | 2014-09-28 | 2015-01-14 | 吉林省电力科学研究院有限公司 | Novel medium-speed coal mill exhaust extraction system |
| 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 |
| CN105627343A (en) * | 2014-10-31 | 2016-06-01 | 烟台龙源电力技术股份有限公司 | Powder separating and feeding device of ignition system and boiler ignition system |
| CN109210563A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of new device and its working method explosion-proof for the ball type pulverizer system pulverized coal bin |
-
2012
- 2012-11-22 CN CN 201220620806 patent/CN202973142U/en not_active Expired - Fee Related
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 |
| CN104279575A (en) * | 2014-09-28 | 2015-01-14 | 吉林省电力科学研究院有限公司 | Novel medium-speed coal mill exhaust extraction system |
| CN104279575B (en) * | 2014-09-28 | 2017-01-11 | 吉林省电力科学研究院有限公司 | Medium-speed coal mill exhaust extraction system |
| CN105627343A (en) * | 2014-10-31 | 2016-06-01 | 烟台龙源电力技术股份有限公司 | Powder separating and feeding device of ignition system and boiler ignition system |
| CN105627343B (en) * | 2014-10-31 | 2017-12-26 | 烟台龙源电力技术股份有限公司 | Ignition system divides powder dust feeder and ignition system for boiler |
| CN109210563A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of new device and its working method explosion-proof for the ball type pulverizer system pulverized coal bin |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20151122 |
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| EXPY | Termination of patent right or utility model |