CN201954529U - DC (direct current) combustor layout structure of cut oval pulverized coal fired boiler - Google Patents

DC (direct current) combustor layout structure of cut oval pulverized coal fired boiler Download PDF

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Publication number
CN201954529U
CN201954529U CN2011200794402U CN201120079440U CN201954529U CN 201954529 U CN201954529 U CN 201954529U CN 2011200794402 U CN2011200794402 U CN 2011200794402U CN 201120079440 U CN201120079440 U CN 201120079440U CN 201954529 U CN201954529 U CN 201954529U
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China
Prior art keywords
burner
swing type
full swing
wind
boiler
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Expired - Fee Related
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CN2011200794402U
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Chinese (zh)
Inventor
赵斌
武志飞
付子文
李均昊
闫晨帅
王刚
王奇
董忠源
张振超
田雪丽
李佩
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Hebei United University
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Hebei United University
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Anticipated expiration legal-status Critical
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Abstract

The utility model relates to a layout structure of a pulverized coal fired boiler, in particular to a DC (direct current) combustor layout structure of a cut oval pulverized coal-fired boiler. The layout structure comprises fully-swinging type DC combustors which are arranged in multiple layers, and the fully-swinging type DC combustors are arranged on the front wall, the rear wall and the four corners of a hearth in multiple layers. Compared with the prior art, the layout structure has the advantages that as the fully-swinging type DC combustors are arranged on the front wall, the rear wall and the four corners of the hearth in multiple layers, the hearth is better filled with flames, the water cooled wall of the boiler is more uniformly heated, the water cooled wall of the boiler is prevented from slag-bonding and high-temperature corrosion, and the smoke temperature difference of the left side and the right side of a horizontal flue on the outlet of the hearth is reduced; the width and depth structure parameters of the hearth are optimally designed so as to meet the requirements of large boiler units.

Description

Cut oval combusting coal fines boiler DC burner arrangement
Technical field:
The utility model relates to a kind of coal powder fired boiler burner arrangement, a kind ofly specifically cuts oval combusting coal fines boiler DC burner arrangement.
Background technology:
Along with the anxiety of the energy, each state is all considering to solve energy problem.China's power industry improves coal-fired unit efficiency mainly based on coal fired power generation, and reducing pollutant emission is the eternal theme of coal fired power generation, especially the main task of China's thermal power structure adjustment.Super (surpassing) critical unit is in developed country's extensive use, efficient is higher by 2~3% than Subcritical Units, and can compare favourably with Subcritical Units at aspects such as the advance of the maturity of unit, reliability, hot mobility, availability, technology and unit durabilities.Therefore obtained unconventional development in China in recent years, but along with the raising of boiler parameter and the increase of capacity, the problem that combustion system occurs is also more and more outstanding.
Super (surpassing) the critical coal powder boiler combustion mode of having gone into operation at present, mainly contains opposed firing and tangential firing dual mode.Adopt the boiler of opposed firing mode, the increase of boiler capacity mainly is to increase furnace width, and the degree of depth changes not quite relatively, only increases burner quantity at the stove cross direction.And the boiler that adopts the tangential firing mode can be subjected to the restriction that burner jet will guarantee furnace flame degree of filling, the burner hearth central authorities formation circle of contact, generally in order to guarantee that furnace flame forms the circle of contact, jet length should not be long and the burner hearth breadth depth ratio generally be controlled between 0.8~1.2.Some 1,000,000 unit has adopted the combustion system of the anistree pair of circle of contact now, and burner hearth breadth depth ratio basic controlling requires all higher to wide with the deep structure determining dimensions in the design about 2.Practice shows that tangential firing is being better than opposed firing aspect coal adaptability and the combustion stability, uses more.Wherein, station boiler arranges that direct current tangential firing mode is a kind of important form that China generally adopts for four jiaos.The topmost characteristics of corner tangential firing mode are exactly gas stream in the stove rotation, and the disturbance that helps air mixes, and then have created advantage for burning, the after-flame of fuel in the stove.But there are 2 deficiencies in tangential firing, the one since the outlet remainder air-flow reverse the cigarette temperature deviation that easily causes furnace outlet horizontal flue left and right sides, so superheater particularly reheater cause overtemperature tube burst easily; The 2nd, tangential firing is easy to generate air-flow and pastes wall, thereby comparison dashes easier slagging scorification of burning and corrosion, when particularly using meager coal, because the momentum flow rate of combustion-delaying and secondary wind and a wind makes flame whitewash a wall than big, causes slagging scorification and high temperature corrosion.
Along with the development of national low-carbon economy, the increase of super (surpassing) critical unit installed capacity, the chamber structure optimal design of heavy duty boiler and the science type selecting of tangential firing mode are the very serious technical barriers that power industry faces.Therefore, for guaranteeing the safe and highly efficient operation of boiler, research and develop novel coal powder boiler straight-flow burner arrangement and be of great immediate significance.
The utility model content:
Goal of the invention of the present utility model be to overcome the deficiency of background technology and four jiaos of Pulverized Coal fired Boiler Furnace and forward and backward wall mixed-arrangement be provided a kind ofly cut oval combusting coal fines boiler DC burner arrangement.
The utility model adopts following technical scheme:
A kind ofly cut oval combusting coal fines boiler DC burner arrangement, comprise the full swing type DC burner of layered arrangement, described full swing type DC burner layered arrangement is on four jiaos in the forward and backward wall of burner hearth and burner hearth.
The utility model of employing technique scheme compared with prior art, full swing type DC burner branch is placed on the forward and backward wall of burner hearth and four jiaos, flame forms elliptical shape in the process of burning, make flame better be full of burner hearth, being heated of boiler water wall is more even, thereby avoid the slagging scorification and the high temperature corrosion of boiler water wall, reduce the cigarette temperature deviation of furnace outlet horizontal flue left and right sides, also can make the wide deep structure parameter of burner hearth reach optimal design, to adapt to the requirement that the boiler unit maximizes.
As a kind of preferred version of the present utility model, the full swing type DC burner of wind of described confession or confession secondary wind all is level and vertical pendulum dynamic formula structure.
As a kind of preferred version of the present utility model, the layering from top to bottom of described full swing type DC burner is provided with the full swing type DC burner of a wind of six confessions, is provided with the full swing type DC burner for secondary wind between the full swing type DC burner of a wind of adjacent two confessions.
As a kind of preferred version of the present utility model, the full swing type DC burner of the wind of confession that described layer is together arranged is connected with same coal pulverizer.
As a kind of preferred version of the present utility model, the full swing type DC burner of described layered arrangement is arranged as six for every layer.
As a kind of preferred version of the present utility model, the full swing type DC burner of a described wind of confession of arranging with layer places on Hou Qiang and the back wall angle totally three, and these three full swing type DC burners from left to right and the angle between the wall of back be respectively: 50 °, 107 ° and 25 °, the angular range that these three full swing type DC burners swing is respectively: ± 5 °, ± 7 ° and ± 2 °, its angular range that swings up and down is ± 10~15 °.
As a kind of preferred version of the present utility model, the full swing type DC burner of a described wind of confession of arranging with layer places on front wall and the front wall angle totally three, and these three full swing type DC burners from right to left and the angle between the front wall be respectively: 50 °, 107 ° and 25 °, the angular range that these three full swing type DC burners swing is respectively: ± 5 °, ± 7 ° and ± 2 °, its angular range that swings up and down is ± 10~15 °.
Description of drawings:
Fig. 1 is the utility model combustion zone structural representation.
Fig. 2 is the full swing type DC burner structural representation that the same row of the utility model are arranged.
Fig. 3 is that the utility model is arranged the full swing type DC burner plan structure schematic diagram that supplies a wind snout with layer.
The specific embodiment:
The utility model is described in further detail below in conjunction with accompanying drawing and 600MW super critical boiler embodiment:
A kind ofly cut oval combusting coal fines boiler DC burner arrangement, referring to accompanying drawing 1 to accompanying drawing 3, among the figure: back wall 1, burning-out zone 2, reducing zone 3, primary zone 4, furnace hopper 5, compact after-flame wind snout 6, the lower part is from after-flame wind snout 7, and top is from after-flame wind snout 8, front wall 9, overfire air port 10, wind snout 11, the first full swing type DC burners 12, left side wall 13, the second full swing type DC burner 14, the 3rd full swing type DC burner 15, the four full swing type DC burners 16, right-side wall 17, the 5th full swing type DC burner 18, the six full swing type DC burners 19.
Present embodiment, referring to accompanying drawing 1, arranged two-layer after-flame wind snout on 4 tops, main combustion zone, this two-layer after-flame wind snout is respectively the compact after-flame wind snout 6 that is next to top, primary zone, and the separation after-flame wind snout that a segment distance is arranged on compact after-flame wind snout 6, separate the after-flame wind snout and be top from after-flame wind snout 8 and lower part from after-flame wind snout 7.Top is also adopted level and vertical pendulum dynamic formula structure from after-flame wind snout 8 and lower part from after-flame wind snout 7.A part combustion air by these independently spout send into burner hearth, to reach air stage feeding, control lower stoichiometric ratio, the reduction NO xThe purpose of discharging.The layout of wind snout 11 and overfire air port 10 can be divided into burner hearth from bottom to top three zones: main combustion zone 4, and excess air coefficient maintains 0.8~0.9, and control NO is burnt in the burning back that catches fire under oxygen debt condition xGeneration; NO xReducing zone 3, along with the benefit of compact after-flame wind is gone into, excess air coefficient reaches about 1.0 gradually; Burning-out zone 2 separates entering burning-out zone after the after-flame risk investment is gone into, and excess air coefficient reaches 1.15~1.25, and the combustible quilt is after-flame as much as possible.
To reasonably determine the distance of a wind snout 11 of the after-flame wind snout and the superiors, suitable distance and chamber structure, fuel type are relevant, be about 15%~20% for the rational after-flame air quantity of coal-powder boiler, as arranging two separate after-flame wind, the after-flame air quantity can be up to 30%~45%.In addition, after-flame wind will have sufficiently high flow velocity, mixes with the good of flue gas with assurance.
In the present embodiment, the full swing type DC burner layered arrangement of layered arrangement is on forward and backward wall and four jiaos.The rectangular structure of burner hearth, burner hearth is made of front wall 9, back wall 1, left side wall 13 and right-side wall 17.
Full swing type DC burner for a wind all is level and vertical pendulum dynamic formula structure, supplies the full swing type DC burner of secondary wind all to be level and vertical pendulum dynamic formula structure.
As a kind of preferred structure of present embodiment, referring to accompanying drawing 2, full swing type DC burner layering from top to bottom is provided with the full swing type DC burner of a wind of six confessions, and its spout is a wind snout 11; Be provided with the full swing type DC burner for secondary wind between the full swing type DC burner of a wind of adjacent two confessions, its spout is an overfire air port 10, shown in accompanying drawing 2, is five.
As a kind of preferred structure of present embodiment, be connected with same coal pulverizer with layer full swing type DC burner of a wind of confession of arranging.
As a kind of preferred structure of present embodiment, the full swing type DC burner of layered arrangement is arranged as six for every layer.
A kind of preferred structure as present embodiment, the full swing type DC burner of a wind of confession of arranging with layer places on back wall 1 and the back wall angle totally three, shown in accompanying drawing 3, it is respectively the second full swing type DC burner 14, the 3rd full swing type DC burner 15 and the 4th full swing type DC burner 16, and these three full swing type DC burners from left to right and the angle between the wall 9 of back be respectively: 50 °, 107 ° and 25 °, the angular range that three full swing type DC burners swing is respectively: ± 5 °, ± 7 ° and ± 2 °, its angular range that swings up and down are ± 10~15 °.Wherein the 3rd full swing type DC burner 15 and the back angle between the wall 9 is 107 °, is that the jet flames with the 3rd full swing type DC burner 15, second full swing type DC burner 14 and the 4th full swing type DC burner 16 compiles taking measurement of an angle of obtaining to a direction.
A kind of preferred structure as present embodiment, the full swing type DC burner of a wind of confession of arranging with layer places on front wall 9 and the front wall angle totally three, referring to accompanying drawing 3, it is respectively the 5th full swing type DC burner 18, the 6th full swing type DC burner 19 and the first full swing type DC burner 12, and these three full swing type DC burners from right to left and the angle between the front wall 1 be respectively: 50 °, 107 ° and 25 °, the angular range that three full swing type DC burners swing is respectively: ± 5 °, ± 7 ° and ± 2 °, its angular range that swings up and down are ± 10~15 °.Wherein the angle between the 6th full swing type DC burner 19 and the front wall 1 is 107 °, is that the jet flames with the 6th full swing type DC burner 19, first full swing type DC burner 12 and the 5th full swing type DC burner 18 compiles taking measurement of an angle of obtaining to a direction.
In the present embodiment, shown in accompanying drawing 2, on same vertical line, be provided with 15 full swing type DC burners from top to bottom altogether, the full swing type DC burner that six wind snouts 11 are wherein arranged, the full swing type DC burner of five overfire air ports 10, the full swing type DC burner of four after-flame wind snouts in addition.
Referring to accompanying drawing 3, be connected with same coal pulverizer with layer six a full swing type DC burner of a wind snout 11 of arranging.Adopt cold primary air fan positive pressure direct blowing powder system, coal pulverizer is selected medium-speed pulverizer for use, when coal changes greatly, select double-inlet and double-outlet steel ball coal mill, the supply of assurance coal dust during the difficult mill of coal for use.Because the range of the first full swing type DC burner 12 and the 4th full swing type DC burner 16 direct jets is far away, thus should keep higher primary air velocity, to guarantee the enough rigidity of direct jet.Six full swing type DC burners with layer supply a wind snout 11 of a wind to make breeze airflow all can form oval-shaped fireball in the burner hearth internal combustion, combustion flame will better be full of burner hearth, being heated of boiler water wall is more even, can reduce thermal deviation, avoids the water-cooling wall slagging scorification.When external load and combustion conditions change, no matter complete be the swing type DC burner of a wind snout 11, or the full swing type DC burner of overfire air port 10, synchronous vertical and horizontal hunting all can be done.
The utility model is not limited to the cited angle of present embodiment, can determine the actual angle of full swing type DC burner and water-cooling wall according to the breadth depth ratio of burner hearth, promptly is considered as within protection domain of the present utility model as long as formation is cut oval combustion system.Also can according to actual needs full swing type DC burner be made as several layers, be advisable to satisfy the demand.
In boiler startup and operation burning adjustment, cut oval shape by the control of the swing about six every layer full swing type DC burners, avoid the slagging scorification of burner hearth internal heating surface, reduce furnace outlet left and right sides cigarette temperature deviation; Adjust the control flame central position by DC burner swing up and down, the control furnace outlet gas temperature is to stablize vapor (steam) temperature and to avoid superheater, reheater overtemperature and dust stratification.
The utility model adopts low NO xDC burner can effectively reduce NO xDischarge capacity.Owing to adopted oval-shaped tangential firing mode, the size of burner hearth no longer is subject to the breadth depth ratio of burner hearth, so the design of the chamber structure of coal-powder boiler boiler in the large scale development process will be more flexible.Cutting oval combustion system makes flame better be full of burner hearth, being heated of boiler water wall is tending towards even, reduce thermal deviation, avoid the boiler water wall coking, guaranteed the aerodynamic field that the combustion chamber is good, and use port temperature field and be tending towards evenly, furnace outlet left and right sides cigarette temperature deviation reduces, thereby the utility model can effectively improve the safety economy of big capacity coal dust boiler operatiopn and adapt to the flexible selection of coal-powder boiler chamber structure breadth depth ratio in the large scale development process.

Claims (7)

1. cut oval combusting coal fines boiler DC burner arrangement for one kind, comprise the full swing type DC burner of layered arrangement, it is characterized in that: described full swing type DC burner layered arrangement is on the forward and backward wall of burner hearth and four jiaos.
2. according to claim 1ly cut oval combusting coal fines boiler DC burner arrangement, it is characterized in that: wind of described confession or all be level and vertical pendulum dynamic formula structure for the full swing type DC burner of secondary wind.
3. according to claim 1 and 2ly cut oval combusting coal fines boiler DC burner arrangement, it is characterized in that: the layering from top to bottom of described full swing type DC burner is provided with the full swing type DC burner of a wind of six confessions, is provided with the full swing type DC burner for secondary wind between the full swing type DC burner of a wind of adjacent two confessions.
4. according to claim 1ly cut oval combusting coal fines boiler DC burner arrangement, it is characterized in that: the full swing type DC burner of a described wind of confession of arranging with layer is connected with same coal pulverizer.
5. according to claim 1ly cut oval combusting coal fines boiler DC burner arrangement, it is characterized in that: the full swing type DC burner of described layered arrangement is arranged as six for every layer.
6. according to claim 5ly cut oval combusting coal fines boiler DC burner arrangement, it is characterized in that: the full swing type DC burner of a described wind of confession of arranging with layer places on Hou Qiang and the back wall angle totally three, and these three full swing type DC burners from left to right and the angle between the wall of back be respectively: 50 °, 107 ° and 25 °, the angular range that these three full swing type DC burners swing is respectively: ± 5 °, ± 7 ° and ± 2 °, its angular range that swings up and down is ± 10~15 °.
7. according to claim 5ly cut oval combusting coal fines boiler DC burner arrangement, it is characterized in that: the full swing type DC burner of a described wind of confession of arranging with layer places on front wall and the front wall angle totally three, and these three full swing type DC burners from right to left and the angle between the front wall be respectively: 50 °, 107 ° and 25 °, the angular range that these three full swing type DC burners swing is respectively: ± 5 °, ± 7 ° and ± 2 °, its angular range that swings up and down is ± 10~15 °.
CN2011200794402U 2011-03-24 2011-03-24 DC (direct current) combustor layout structure of cut oval pulverized coal fired boiler Expired - Fee Related CN201954529U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338374A (en) * 2011-09-28 2012-02-01 南京创能电力科技开发有限公司 In-furnace grading low-NOx combustion system of low-temperature plasma rotational flow coal powder furnace
CN102679308A (en) * 2012-06-08 2012-09-19 哈尔滨锅炉厂有限责任公司 High-capacity high-parameter over-600 MW subcritical and supercritical oil furnace
CN103438418A (en) * 2013-08-08 2013-12-11 华能国际电力股份有限公司 Double-reverse-U-shaped boiler
CN103712204A (en) * 2013-12-13 2014-04-09 山西蓝天环保设备有限公司 Wall type arrangement direct-current pulverized coal combustion technology used for industrial pulverized coal boiler
CN103968371A (en) * 2014-02-07 2014-08-06 广东电网公司电力科学研究院 Electric combustion boiler and SOFA (separated over fire air) adjustment method based on numerical simulation technique
CN104913288A (en) * 2015-06-30 2015-09-16 广东电网有限责任公司电力科学研究院 Control method of 600 MW subcritical tangentially fired boiler
CN105485667A (en) * 2015-06-18 2016-04-13 无锡华光锅炉股份有限公司 Pulverized coal reheating boiler
CN105927969A (en) * 2016-06-01 2016-09-07 河北省电力建设调整试验所 Combustion system for reducing nitric oxides of front and back wall opposite-combustion boiler
CN111736637A (en) * 2020-05-20 2020-10-02 山东中实易通集团有限公司 Steam temperature control system and method based on hearth temperature measurement
CN113339784A (en) * 2021-04-29 2021-09-03 华电电力科学研究院有限公司 Prevention and control system and method for high-temperature corrosion of water wall of power station boiler

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338374A (en) * 2011-09-28 2012-02-01 南京创能电力科技开发有限公司 In-furnace grading low-NOx combustion system of low-temperature plasma rotational flow coal powder furnace
CN102338374B (en) * 2011-09-28 2013-09-04 南京创能电力科技开发有限公司 In-furnace grading low-NOx combustion system of low-temperature plasma rotational flow coal powder furnace
CN102679308A (en) * 2012-06-08 2012-09-19 哈尔滨锅炉厂有限责任公司 High-capacity high-parameter over-600 MW subcritical and supercritical oil furnace
CN102679308B (en) * 2012-06-08 2015-11-11 哈尔滨锅炉厂有限责任公司 Subcritical, the overcritical oil oven of Large Copacity more than high parameter 600MW
CN103438418A (en) * 2013-08-08 2013-12-11 华能国际电力股份有限公司 Double-reverse-U-shaped boiler
CN103712204A (en) * 2013-12-13 2014-04-09 山西蓝天环保设备有限公司 Wall type arrangement direct-current pulverized coal combustion technology used for industrial pulverized coal boiler
CN103712204B (en) * 2013-12-13 2016-05-11 山西蓝天环保设备有限公司 A kind of wall formula for industrial coal powder boiler is arranged direct-flow pulverized coal combustion device
CN103968371A (en) * 2014-02-07 2014-08-06 广东电网公司电力科学研究院 Electric combustion boiler and SOFA (separated over fire air) adjustment method based on numerical simulation technique
CN103968371B (en) * 2014-02-07 2016-08-31 广东电网公司电力科学研究院 Electric power burning boiler and separation burnout degree control method based on numerical simulation technology
CN105485667B (en) * 2015-06-18 2019-01-01 无锡华光锅炉股份有限公司 A kind of reheating pulverized-coal fired boiler
CN105485667A (en) * 2015-06-18 2016-04-13 无锡华光锅炉股份有限公司 Pulverized coal reheating boiler
CN104913288A (en) * 2015-06-30 2015-09-16 广东电网有限责任公司电力科学研究院 Control method of 600 MW subcritical tangentially fired boiler
CN105927969A (en) * 2016-06-01 2016-09-07 河北省电力建设调整试验所 Combustion system for reducing nitric oxides of front and back wall opposite-combustion boiler
CN111736637A (en) * 2020-05-20 2020-10-02 山东中实易通集团有限公司 Steam temperature control system and method based on hearth temperature measurement
CN113339784A (en) * 2021-04-29 2021-09-03 华电电力科学研究院有限公司 Prevention and control system and method for high-temperature corrosion of water wall of power station boiler

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Granted publication date: 20110831

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