CN2218306Y - Adjustable low concentration, low load combustion stabilizing and clinker preventing unit of coal powder furnace - Google Patents
Adjustable low concentration, low load combustion stabilizing and clinker preventing unit of coal powder furnace Download PDFInfo
- Publication number
- CN2218306Y CN2218306Y CN 94216143 CN94216143U CN2218306Y CN 2218306 Y CN2218306 Y CN 2218306Y CN 94216143 CN94216143 CN 94216143 CN 94216143 U CN94216143 U CN 94216143U CN 2218306 Y CN2218306 Y CN 2218306Y
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- Prior art keywords
- coal
- streamlined
- deep
- spout
- low load
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- Expired - Fee Related
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- 239000000843 powder Substances 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 title abstract description 42
- 238000002485 combustion reaction Methods 0.000 title abstract description 13
- 230000000087 stabilizing effect Effects 0.000 title abstract 2
- 239000003381 stabilizer Substances 0.000 claims abstract description 23
- 239000002817 coal dust Substances 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 9
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005192 partition Methods 0.000 abstract 2
- 238000011144 upstream manufacturing Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000036651 mood Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses an adjustable low concentration, low load combustion stabilizing and clinker preventing unit of a coal powder furnace, comprising a coal powder primary air main provided with a streamlined stop and a streamlined pipe segment cooperated with the streamlined stop at the back end. The anterior part of the coal powder primary air main is provided with a coal powder airflow nozzle. A shade shunting partition is arranged between the nozzle and the streamlined pipe segment in longitudinal direction. The shade shunting partition in the nozzle is provided with a waveform stabilizer horizontally or vertically. With the utility model, pulverized coal concentration can be adjusted within the air range of 0.6-1.15 kg coal /kg with good coal adaptability, and the low sidewind with low pulverized coal concentration (0.1-0.2 kg coal /kg air) is arranged on the back fire side, effectively preventing the boiler from being slagged. The resistance of the utility model is lower than 500 pa. The utility model has the advantages of simple structure, convenient operation, and high operational reliability.
Description
The utility model relates to boiler low load stable combustion and slag-bonding protective device, relates in particular to coal-powder boiler adjustable concentration low load automatic stable burning and slag-bonding protective device.
China's coal resource is abundant, and coal is various.For a long time, thermal power plant is numerous in variety with coal, and many boiler design use coal bigger with the actual coal difference of using, and particularly current coal is in short supply, and steam coal more is difficult to be guaranteed.When changeable the and ature of coal variation of coal caused high load capacity in thermal power plant's running (rate of load condensate is more than 90%), ash erosion was serious, and it is combustion-supporting to throw oil when underrun, has had a strong impact on the safety and economic operation of station boiler.Burner is that station boiler catches fire and steady key of firing.Therefore develop novel burner and have important social and economic benefit with adjustable coal powder density low-load combustion-stabilizing and anti-slagging scorification function.
At present, domestic and international many units successively develop multiple novel burner and combustion technology, stablize boiler combustion, save fuel oil, improve boiler peak load regulation characteristic.As bluff body burner, pre-combustion chamber burner, high speed difference jet, sandwich-wind combustor etc., these technology are in the smooth combustion of boiler, particularly at the stable ignition of colm, overheavy firing, important breakthrough is arranged, but these burners are when coal changes, coal adaptability is poor, when particularly ature of coal improves, cause the own slagging scorification of boiler or stabilizer sometimes.U.S. CE company, various coal powder light-dark isolation technics and burner that Mitsubishi heavy industry etc. are developed in recent years, though at stable ignition, there is remarkable result the overheavy firing aspect, also has certain slagging scorification effect of falling, but its separator is because resistance is big, volume is big, and coal powder density is non-adjustable, uses in boiler of power plant and is subjected to certain limitation, is difficult to large tracts of land and promotes.
The purpose of this utility model provides a kind of adjustable coal powder density, changes to adapt to coal, and low-load automatic stable burning has anti-slagging scorification function again, coal-powder boiler adjustable concentration low load automatic stable burning that suitable station boiler is used and anti-slag device.
The utility model is taked following measures in order to achieve the above object.Be provided with streamlined block and streamlined pipeline section with matching in airduct rear end of coal dust, be provided with the breeze airflow spout at airduct front end of coal dust, vertically be provided with deep or light split-flow baffles in that spout and streamline tube are intersegmental, level or vertically be provided with the waveform stabilizer before the deep or light split-flow baffles in spout.
The utility model has the advantages that: (1) can carry out deep or light shunting in the straight tube, can carry out deep or light side left and right sides guiding behind the bend pipe, and can carry out upper and lower to deep or light shunting, and deep or light shunting effect can reach 8～10: 1.(2) this device can be regulated coal powder density in 0.6～1.15kg coal dust/kg air scope, and coal adaptability is good.(3) this device is equipped with stabilizer in a wind snout, produces high temperature gases recirculating at a wind snout, and stabilizer adjustable angle joint, has transferred the wind imaginary circle one time with this.When underload, stabilizer angle deflection upstream is strengthened breeze airflow and is caught fire and steady combustion.When full load, the stabilizer adjustable angle is back to original position, can prevent that spout from burning out.(4) this device light sidewind that will hang down coal powder density (0.1～0.2kg coal dust/kg air) is arranged in back-fire side, can effectively prevent boiler scaling.(5) this device resistance is lower than 500pa, and simple in structure, and is easy to use, the operational reliability height.
Elaborate below in conjunction with accompanying drawing.
Accompanying drawing is low bear automatic stable burning of coal-powder boiler adjustable concentration and slag-bonding protective device schematic diagram.
Low bear automatic stable burning of coal-powder boiler adjustable concentration and slag-bonding protective device comprise: be provided with streamlined block 4 and streamlined pipeline section 6 with matching in airduct 2 rear ends of coal dust, be provided with breeze airflow spout 1 at airduct front end of coal dust, streamline tube is intersegmental with it vertically is provided with deep or light split-flow baffles 8 at spout, level or vertically be provided with waveform stabilizer 9 before the deep or light split-flow baffles in spout.Have balance pipe 7 on deep or light split-flow baffles, its percent opening is 10～20%, is provided with adjustable height device 5 on streamlined block, is provided with adjustable angle device 3 on the waveform stabilizer.Deep or light air baffle and streamlined block distance L
1With the ratio of an airduct width B of coal dust be 2～3, streamlined dog height H
1With the ratio of an airduct width B of coal dust be 0.2～0.3, streamlined pipeline section Breadth Maximum H
2With the ratio of an airduct width B of coal dust be 1.1～1.2.Breeze airflow spout and the corresponding spread angle alpha of waveform stabilizer
1=15～20 degree, stabilizer places in the spout, stabilizer and jet expansion distance h=40～100mm, waveform stabilizer adjusting angle 5～10 degree.
When coal variation or load reduced, temperature reduced in the stove, is prone to unstable combustion, and can regulate stove internal combustion situations this moment by three kinds of methods, and one, regulate streamlined dog height.When streamlined dog height increased, dense side coal powder density increased, and light side is thinning.Heterogeneous test shows, dense side concentration can reach 1.0～1.1kg coal dust/kg air, and light side coal powder density only is 0.2～0.1kg coal dust/kg air (average coal powder density is 0.6kg coal dust/kg air), because the side coal powder density that warms oneself in front of a fire improves, coal powder ignition and burning are significantly strengthened.Two, change the stabilizer angle, make stabilizer angle deflection upstream, thereby change general mood stream imaginary circle in the stove.The side that concentrates breeze airflow is subjected to the stabilizer water conservancy diversion, and upstream the deflection certain angle enters in the high-temperature flue gas of upstream.Because high concentration pulverized coal is subjected to the fierce heating of upstream high-temperature flue gas and is subjected to the effect of speed stagnation, has produced a high coal powder density in the side of waring oneself in front of a fire, the band that catches fire of high-temperature and low velocity, breeze airflow is caught fire this band that catches fire and surely combustion is highly beneficial.Three, in producing a high-temperature flue gas, jet expansion refluxes, and further strengthen and catch fire and steady combustion.When coal improves or loads when increasing, for prevent that spout from burning out and burner nozzle near slagging scorification, available two kinds of methods are regulated stove internal combustion operating mode.One, reduce streamlined dog height, promptly reduce deep or light shunting effect.Two, reduce stabilizer inclination angle upstream, promptly reduce the upstream deflection of side coal dust of concentrating, postpone a wind and catch fire.When streamlined dog height changed, deep or light two crosswind amounts distribution changed, and is balanced for guaranteeing deep or light two crosswind speed, opened many pressure compensation openings on split-flow baffles, and the percent opening of balance pipe is a key parameter.Test shows that percent opening is suitable, and then deep or light two side speed reach balance fully.
Anticlogging key is the light sidewind after the deep or light shunting is arranged in back-fire side.And have a certain degree with dense sidewind shape.Though slagging scorification is a complex physicochemical process, but purely from the physical process analysis, have only the coal particle of molten to get to or be diffused on the water-cooling wall and just can cause slagging scorification, (concentration is 0.1～0.2kg/kg) wind, blocks the coal dust particle that concentrates and can significantly reduce the probability that the coal particle is got to water-cooling wall to water-cooling wall impact and diffusion to utilize low coal powder density.Test shows, adopt this device after, the big reduction of wall deposition, thus reach anticlogging purpose.
Claims (4)
1. coal-powder boiler adjustable concentration low load automatic stable burning and slag-bonding protective device, it is characterized in that, be provided with streamlined block [4] and streamlined pipeline section with matching [6] in an airduct of coal dust [2] rear end, be provided with breeze airflow spout [1] at airduct front end of coal dust, at spout and the intersegmental deep or light split-flow baffles [8] that vertically is provided with of streamline tube, level or vertically be provided with waveform stabilizer [9] before the deep or light split-flow baffles in spout.
2. a kind of coal-powder boiler adjustable concentration low load automatic stable burning according to claim 1 and slag-bonding protective device, it is characterized in that having on the said deep or light split-flow baffles balance pipe [7], on streamlined block, be provided with adjustable height device [5], on the waveform stabilizer, be provided with adjustable angle device [3].
3. a kind of coal-powder boiler adjustable concentration low load automatic stable burning according to claim 1 and slag-bonding protective device is characterized in that the percent opening on the said deep or light split-flow baffles is 10～20%, deep or light air baffle and streamlined block distance L
1With the ratio of an airduct width B of coal dust be 2～3, streamlined dog height H
1With the ratio of an airduct width B of coal dust be 0.2～0.3, streamlined pipeline section Breadth Maximum H
2With the ratio of an airduct width B of coal dust be 1.1～1.2.
4. a kind of coal-powder boiler adjustable concentration low load automatic stable burning according to claim 1 and 2 and slag-bonding protective device is characterized in that said breeze airflow spout and the corresponding spread angle alpha of waveform stabilizer
1=15～20 degree, the waveform stabilizer places in the spout, and waveform stabilizer and jet expansion distance h=40～100mm, waveform stabilizer adjusting angle are 5～10 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94216143 CN2218306Y (en) | 1994-07-01 | 1994-07-01 | Adjustable low concentration, low load combustion stabilizing and clinker preventing unit of coal powder furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94216143 CN2218306Y (en) | 1994-07-01 | 1994-07-01 | Adjustable low concentration, low load combustion stabilizing and clinker preventing unit of coal powder furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2218306Y true CN2218306Y (en) | 1996-01-24 |
Family
ID=33831932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94216143 Expired - Fee Related CN2218306Y (en) | 1994-07-01 | 1994-07-01 | Adjustable low concentration, low load combustion stabilizing and clinker preventing unit of coal powder furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2218306Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154441A (en) * | 2021-05-08 | 2021-07-23 | 西安热工研究院有限公司 | Pulverized coal concentration adjusting device for improving low-load stable combustion capacity of boiler |
-
1994
- 1994-07-01 CN CN 94216143 patent/CN2218306Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154441A (en) * | 2021-05-08 | 2021-07-23 | 西安热工研究院有限公司 | Pulverized coal concentration adjusting device for improving low-load stable combustion capacity of boiler |
| CN113154441B (en) * | 2021-05-08 | 2023-01-03 | 西安热工研究院有限公司 | Pulverized coal concentration adjusting device for improving low-load stable combustion capacity of boiler |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |