CN1333199C - W-shape flame furnace with gradation coal burner - Google Patents

W-shape flame furnace with gradation coal burner Download PDF

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Publication number
CN1333199C
CN1333199C CNB2005100100157A CN200510010015A CN1333199C CN 1333199 C CN1333199 C CN 1333199C CN B2005100100157 A CNB2005100100157 A CN B2005100100157A CN 200510010015 A CN200510010015 A CN 200510010015A CN 1333199 C CN1333199 C CN 1333199C
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CN
China
Prior art keywords
air
coal
burner
flow nozzles
furnace
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CNB2005100100157A
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Chinese (zh)
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CN1707160A (en
Inventor
李争起
任枫
高继慧
邱朋华
秦裕琨
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哈尔滨工业大学
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Priority to CNB2005100100157A priority Critical patent/CN1333199C/en
Publication of CN1707160A publication Critical patent/CN1707160A/en
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Publication of CN1333199C publication Critical patent/CN1333199C/en

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Abstract

The present invention relates to a W-shaped flame furnace with a concentration pulverized coal combustion device, particularly to a combustion device. The problems of unstable combustion, furnace wall slagging and high-temperature corrosion exist in existing W-shaped flame furnaces. The present invention provides a W-shaped flame furnace with a concentration pulverized coal combustion device. The present invention comprises a furnace arch 1, a side wall 2, a furnace chamber 3 surrounded by the furnace arch 1 and the side wall 2 and a combustor 4, wherein the combustor 4 comprises a thick pulverized coal airflow nozzle 4-1-1 and a thin pulverized coal airflow nozzle 4-2-1, the thick pulverized coal airflow nozzle 4-1-1 is adjacent to the center of the furnace chamber 3, and the thin pulverized coal airflow nozzle 4-2-1 is close to the side wall 2. The present invention greatly raises the melting temperature of ash, the slagging of water-cooled walls is avoided; meanwhile, the present invention damages a reducing atmosphere for forming high-temperature corrosion, and high-temperature corrosion is prevented. Meanwhile, the present invention reaches the goals of timely ignition and stable combustion, and thereby, the slagging, the high-temperature corrosion and the low stable combustion of the furnace wall can be effectively prevented.

Description

A kind of W shape flame furnace with gradation coal burner
Technical field:
The present invention relates to a kind of burner, particularly a kind of flame furnace.
Background technology:
W shape flame burning technology is a kind of specially for using the combustion technology that low-volatite coal designs, and it can be by strengthening the after-flame that flame travel promotes coal dust.This technology is adopted by the boiler of domestic part power plant at present.And for the burner on the boiler, what a lot of power plant adopted is the circular gradation coal burner of cyclone separating of circular nozzles, and circular thick coal culm air-flow nozzles are positioned at side wall one side, and circular thin powdered coal air-flow nozzles are positioned at burner hearth center one side.Because the burner hearth center is a high-temperature area, but what close high-temperature area sprayed into is the thin powdered coal air-flow, what the thick coal culm air-flow sprayed into then is the low-temperature region of close side wall, therefore do not form the high-temperature high concentration zone, coal dust can not in time catch fire, simultaneously, owing to can not form the high-temperature high concentration zone, thereby flame holding is bad, and steady combustion ability is low under the underload, and coal adaptability is poor.And, threaten the functional reliability of boiler because the thick coal culm air-flow slagging scorification and high temperature corrosion phenomenon also occur, thereby has a strong impact on the availability and the thermal efficiency of boiler near side wall.
Summary of the invention:
For solving the problem of the unstable combustion, furnace wall slagging scorification and the high temperature corrosion that exist in the present W shape flame furnace, the invention provides a kind of W shape flame furnace with gradation coal burner, it comprises chimney arch 1, side wall 2, the burner hearth 3 and the burner 4 that surround by chimney arch 1, side wall 2, described burner 4 comprises thick coal culm air-flow nozzles 4-1-1 and thin powdered coal air-flow nozzles 4-2-1, described thick coal culm air-flow nozzles 4-1-1 is arranged on the chimney arch 1 and the center of close burner hearth 3, and thin powdered coal air-flow nozzles 4-2-1 is arranged on the side wall 2.Thin powdered coal air-flow of the present invention sprays into the zone of close side wall 2 in the burner hearth via thin powdered coal air-flow nozzles 4-2-1, just near water-cooling wall, form oxidizing atmosphere thus, significantly improved grey fusion temperature, avoided the water-cooling wall slagging scorification, it has also destroyed the reducing atmosphere that forms high temperature corrosion simultaneously, has prevented high temperature corrosion.At opposite side, the thick coal culm air-flow sprays near burner hearth central side zone through thick coal culm air-flow nozzles 4-1-1, because this part zone is near high-temperature region, burner hearth center, the thick coal culm air-flow can entrainment high-temperature flue gas after spraying into burner hearth in a large number, the purpose of in time catching fire be can reach, thereby furnace wall slagging scorification, high temperature corrosion and low load stable combustion realized preventing effectively with smooth combustion.
Description of drawings:
Fig. 1 is the utility model overall structure schematic diagram, and Fig. 2 is the structural representation of the specific embodiment two, and Fig. 3 is the structural representation of the specific embodiment three, and Fig. 4 is the I place enlarged drawing of Fig. 2.
The specific embodiment:
The specific embodiment one: present embodiment comprises chimney arch 1, side wall 2, the burner hearth 3 and the burner 4 that surround by chimney arch 1, side wall 2, described burner 4 comprises thick coal culm air-flow nozzles 4-1-1 and thin powdered coal air-flow nozzles 4-2-1, described thick coal culm air-flow nozzles 4-1-1 is provided with near the center of burner hearth 3, and thin powdered coal air-flow nozzles 4-2-1 is provided with near side wall 2.Because thick coal culm air-flow nozzles 4-1-1 is near the center of burner hearth 3, so the close burner hearth center of the thick coal culm air-flow that sprays into high-temperature area, the thick coal culm air-flow can entrainment high-temperature flue gas after spraying into burner hearth in a large number, can reach the purpose of in time catching fire with smooth combustion.Because thin powdered coal air-flow nozzles 4-2-1 is near side wall 2, so the thin powdered coal air-flow that sprays into is near the sidewall of burner hearth, just near water-cooling wall, form oxidizing atmosphere thus, significantly improved grey fusion temperature, avoided the water-cooling wall slagging scorification, it has also destroyed the reducing atmosphere that forms high temperature corrosion simultaneously, has prevented high temperature corrosion.
The specific embodiment two: also there is NO in existing burner except the problem that has unstable combustion, furnace wall slagging scorification and high temperature corrosion xThe also unconspicuous problem of effect that discharge capacity reduces.With reference to Fig. 2, the burner 4 of present embodiment is to be linked to each other with blast pipe 4-2 by whirlwind tube 4-1 to form, the lower end of described whirlwind tube 4-1 is thick coal culm air-flow nozzles 4-1-1, the lower end of described blast pipe 4-2 is thin powdered coal air-flow nozzles 4-2-1, described thick coal culm air-flow nozzles 4-1-1 and thin powdered coal air-flow nozzles 4-2-1 are arranged on the chimney arch 1, wherein, thick coal culm air-flow nozzles 4-1-1 is near the center of burner hearth 3, thin powdered coal air-flow nozzles 4-2-1 is near side wall 2, and the adjusting rod 5 that band blade 5-1 is housed in described whirlwind tube 4-1 is regulated air-flow eddy flow degree.The gap that the limit wall of the outlet of thin powdered coal air-flow nozzles 4-2-1 and thick coal culm air-flow nozzles 4-1-1 and chimney arch 1 exists forms circumference air port 10, with reference to Fig. 4, bellows 11 blast surrounding air from circumference air port 10, the area in circumference air port is very little, the secondary wind that sprays into only plays the effect of cooling nozzles, air quantity seldom (less than primary air flow 10%), thereby very little to the diluting effect of thick coal culm air-flow, the effect of cooling thick coal culm air-flow nozzles 4-1-1 and thin powdered coal air-flow nozzles 4-2-1 can be played in the circumference air port.Have multiple tracks slit 2-1 on side wall 2, can blast secondary wind from here in burner hearth 3 by bellows 11, secondary wind is subjected to the obstruct of thin powdered coal air-flow, can't be at once and the mixing of thick coal culm air-flow, and coal dust is in for a long time away from the stoichiometric ratio fired state, suppressed NO xGeneration, thereby make NO xDischarge capacity obtained tangible reduction.
The primary wind and powder mixture of sending here through pulverized coal channel from coal pulverizer tangentially enters whirlwind tube 4-1 through coal powder entrance pipe 12, and pulverized coal particle wherein is because of the eddy flow centrifugation, and it is few to make wind of whirlwind tube 4-1 core contain powder.The blast pipe 4-2 that is contained in whirlwind tube 4-1 center contains a few wind of powder (weary gas) with part and draws, form the thin powdered coal air-flow and (contain 10% the total powder amount of having an appointment, 50% primary air flow), spray into the zone of close side wall 2 in the burner hearth via thin powdered coal air-flow nozzles 4-2-1, just near water-cooling wall, form oxidizing atmosphere thus, significantly improved grey fusion temperature, avoided the water-cooling wall slagging scorification, it has also destroyed the reducing atmosphere that forms high temperature corrosion simultaneously, has prevented high temperature corrosion.At opposite side, remaining breeze airflow is owing to the extraction coal powder density of weary gas is improved in the whirlwind tube 4-1, spray near burner hearth central side zone through thick coal culm air-flow nozzles 4-1-1, because this part zone is near high-temperature region, burner hearth center, the thick coal culm air-flow can entrainment high-temperature flue gas after spraying into burner hearth in a large number, can reach the purpose of in time catching fire with smooth combustion.
The specific embodiment three: with reference to Fig. 3, the thick coal culm air-flow nozzles 4-1-1 of present embodiment is arranged on the chimney arch 1, described thin powdered coal air-flow nozzles 4-2-1 is arranged on the side wall 2, distance between thick coal culm air-flow nozzles 4-1-1 and the thin powdered coal air-flow nozzles 4-2-1 is further increased, postpone the mixing of air-flow, strengthened the effect of bias combustion more.
The specific embodiment four: now, what the part power plant that has adopted is the slit gradation coal burner, what deep or light separation was also adopted is cyclone separator, but what bias pulverized coal air-flow nozzles all adopted is slit rectangle nozzles, and is provided with at interval in arch upper edge front-back wall direction with the overfire air port of rectangle.Because the overfire air port of slit thick coal culm rectangle nozzles and rectangle is provided with at interval, and next-door neighbour's rectangular jet limit all is long limit, thereby the primary and secondary air mixing early, and the thick coal culm air-flow is easy to diluted, lose the effect of bias combustion, can not suppress NO effectively xGeneration.Simultaneously, can not form the high-temperature high concentration zone, thereby flame holding is bad, steady combustion ability is low under the underload, and coal adaptability is poor.And the structure air-flow poor rigidity of thick coal culm air-flow nozzles slit is in order to form W shape flame, have only to carry downwards and dash by at a high speed secondary wind, and higher secondary wind speed improves the dense primary air velocity in fire area with after a wind mixes, and is unfavorable for coal powder ignition and flame stabilization.
Present embodiment is in order to overcome above-mentioned defective, and 4-1-1 is designed to circular spout with thick coal culm air-flow nozzles.The surrounding air spout 10 of thick coal culm air-flow nozzles 4-1-1 and periphery thereof is all rounded, makes the air-flow of outlet have big rigidity, can further go deep into burner hearth downwards, increase stroke, promote that coal dust burns and flame stabilization, the coal adaptive capacity strengthens, improve efficiency of combustion, and suppressed NO effectively xGeneration.
The specific embodiment five: with reference to Fig. 2, present embodiment is by whirlwind tube 4-1, blast pipe 4-2, weary gas air door baffle plate 4-3, burner hearth side wall 2, arch upper periphery air door baffle plate 13, coal powder entrance pipe 12, adjusting rod 5, chimney arch 1, racemization blade 5-1, bellows 11, circular thick coal culm air-flow nozzles 4-1-1 and thin powdered coal air-flow nozzles 4-2-1 form.Whirlwind tube 4-1 and blast pipe 4-2 are installed on the chimney arch 1 jointly, and circular thick coal culm air-flow nozzles 4-1-1 places near the burner hearth central side, and thin powdered coal air-flow nozzles 4-2-1 places near burner hearth side wall 2 sides.Keep certain distance between thin powdered coal air-flow nozzles 4-2-1 and the circular thick coal culm air-flow nozzles 4-1-1, to avoid too early mixing dense, light air-flow.Two nozzles all exist the gap to form circumference air port 10 with chimney arch 1 limit wall, be equipped with air door baffle plate 13 respectively on the coupled air channel 14, regulate the aperture of surrounding air door shield plate 13, can control the size of the circumference air quantity that blasts by bellows 11, thereby regulate the temperature of burner nozzles, play the effect of cooling nozzles.Be equipped with air door baffle plate 4-3 on the blast pipe 4-2, top is stretched into from whirlwind tube 4-1 central upper portion, and whirlwind tube 4-1 upper outside is connected with coal powder entrance pipe 12, is used to import breeze airflow.Simultaneously, among the whirlwind tube 4-1 adjusting rod 5 is installed also, it has racemization blade 5-1 near circular thick coal culm air-flow nozzles 4-1-1 one face down bonding.The structure of racemization blade 5-1 can be varied, and as adopting the herringbone blade, 5 pulling racemization blade 5-1 move up and down by adjusting rod, change the air quantity that flows through blade 5-1, regulate the spin intensity that sprays into the burner hearth breeze airflow with this.
The specific embodiment six: present embodiment is done a general introduction to device of the present invention on the whole, with reference to Fig. 1, it comprises chimney arch 1, side wall 2, the burner hearth 3 and the burner 4 that surround by chimney arch 1, side wall 2, also comprise large-size screen monitors 6, superheater 7, economizer 8 and air preheater 9, described large-size screen monitors 6 and superheater 7 are arranged on the top of burner hearth 3, and economizer 8 and air preheater 9 are arranged in the back-end ductwork 15.Be arranged on the burner 4 ejection breeze airflow mixed combustions burner hearth 3 in downwards on the chimney arch 1, emit a large amount of heats, the air-flow rising of turning back in burner hearth 3 bottoms, formation W shape flame.Hot flue gas continues to rise, and steam, boiler feedwater and the air of the large-size screen monitors 6 of flowing through, superheater 7, economizer 8,9 pairs of the insides of air preheater heat, and discharges at last and enters flue gas processing device.

Claims (6)

1, a kind of W shape flame furnace with gradation coal burner, it comprises chimney arch (1), side wall (2), the burner hearth (3) and the burner (4) that surround by chimney arch (1), side wall (2), described burner (4) comprises thick coal culm air-flow nozzles (4-1-1) and thin powdered coal air-flow nozzles (4-2-1), described thick coal culm air-flow nozzles (4-1-1) are arranged on the center of the last and close burner hearth (3) of chimney arch (1), it is characterized in that described thin powdered coal air-flow nozzles (4-2-1) are arranged on the side wall (2).
2, a kind of W shape flame furnace with gradation coal burner according to claim 1 is characterized in that described thick coal culm air-flow nozzles (4-1-1) are circular spout.
3, a kind of W shape flame furnace according to claim 1 with gradation coal burner, it is characterized in that described burner (4) is to be linked to each other with blast pipe (4-2) by whirlwind tube (4-1) to form, the lower end of described whirlwind tube (4-1) is thick coal culm air-flow nozzles (4-1-1), and the lower end of described blast pipe (4-2) is thin powdered coal air-flow nozzles (4-2-1).
4, a kind of W shape flame furnace with gradation coal burner according to claim 3 is characterized in that being equipped with in the described whirlwind tube (4-1) adjusting rod (5) of being with blade (5-1).
5, a kind of W shape flame furnace according to claim 1 with gradation coal burner, it is characterized in that thick coal culm air-flow nozzles (4-1-1) and thin powdered coal air-flow nozzles (4-2-1) and chimney arch (1) limit wall exist the gap to form circumference air port (10), and on the air channel (14) that circumference air port (10) link to each other air door baffle plate (13) is installed.
6, a kind of W shape flame furnace according to claim 1 with gradation coal burner, it is characterized in that it also comprises large-size screen monitors (6), superheater (7), economizer (8) and air preheater (9), described large-size screen monitors (6) and superheater (7) are arranged on the top of burner hearth (3), and economizer (8) and air preheater (9) are arranged in the back-end ductwork (15).
CNB2005100100157A 2005-05-23 2005-05-23 W-shape flame furnace with gradation coal burner CN1333199C (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101561138B (en) * 2009-05-27 2010-12-08 哈尔滨工业大学 Secondary concentration double-nozzle micro-oil pulverized coal igniting device
CN109945165A (en) * 2019-03-11 2019-06-28 哈尔滨工业大学 A kind of W flame boiler of chimney arch asymmetric arrangement

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CN100402923C (en) * 2006-06-29 2008-07-16 王树洲 Smokeless, coal saving type horizontal heat transfer oil stove with mechanical fire grate
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CN101368725B (en) * 2008-09-27 2010-07-21 哈尔滨工业大学 Stable combustion anti-slag gap type W-shaped flame boiler apparatus
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CN102297418B (en) * 2011-08-12 2013-03-13 哈尔滨工业大学 Thick and thin pulverized coal nozzle interlacedly arranged W-flame boiler with multiple ejections and staged combustion
CN102679330A (en) * 2012-06-07 2012-09-19 哈尔滨锅炉厂有限责任公司 Separation over-fire air-low NOx dense-light W-shaped flame combustion device
CN104676583A (en) * 2013-11-26 2015-06-03 烟台龙源电力技术股份有限公司 W flame boiler with sidewall having over fire air nozzles
CN105546525A (en) * 2015-10-14 2016-05-04 重庆市富燃科技有限责任公司 Method for reducing nitrogen oxides of W type coal-fired boiler
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JPS63143408A (en) * 1986-12-03 1988-06-15 Babcock Hitachi Kk Coal burner of high fuel ratio
CN1203340A (en) * 1997-06-19 1998-12-30 东方锅炉(集团)股份有限公司 W-type boiler flame monitoring peep hole and camera probe fitting method
CN1587799A (en) * 2004-07-22 2005-03-02 华中科技大学 Device and method for w shape flame boiler completely burning
CN2793551Y (en) * 2005-05-23 2006-07-05 哈尔滨工业大学 W-shaped flame boiler with concentrated and weak powdered coal burner

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS63143408A (en) * 1986-12-03 1988-06-15 Babcock Hitachi Kk Coal burner of high fuel ratio
CN1203340A (en) * 1997-06-19 1998-12-30 东方锅炉(集团)股份有限公司 W-type boiler flame monitoring peep hole and camera probe fitting method
CN1587799A (en) * 2004-07-22 2005-03-02 华中科技大学 Device and method for w shape flame boiler completely burning
CN2793551Y (en) * 2005-05-23 2006-07-05 哈尔滨工业大学 W-shaped flame boiler with concentrated and weak powdered coal burner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101561138B (en) * 2009-05-27 2010-12-08 哈尔滨工业大学 Secondary concentration double-nozzle micro-oil pulverized coal igniting device
CN109945165A (en) * 2019-03-11 2019-06-28 哈尔滨工业大学 A kind of W flame boiler of chimney arch asymmetric arrangement

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