CN202056867U - Combustion device of multifunctional tangentially fired pulverized coal boiler - Google Patents

Combustion device of multifunctional tangentially fired pulverized coal boiler Download PDF

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Publication number
CN202056867U
CN202056867U CN2011201505005U CN201120150500U CN202056867U CN 202056867 U CN202056867 U CN 202056867U CN 2011201505005 U CN2011201505005 U CN 2011201505005U CN 201120150500 U CN201120150500 U CN 201120150500U CN 202056867 U CN202056867 U CN 202056867U
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CN
China
Prior art keywords
flame
burner hearth
height
function area
combustion
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Expired - Lifetime
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CN2011201505005U
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Chinese (zh)
Inventor
包国举
李顺昶
赵忠斌
张隽逸
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GANSU HONGFA ELECTRIC POWER ENGINEERING TECHNOLOGY Co Ltd
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GANSU HONGFA ELECTRIC POWER ENGINEERING TECHNOLOGY Co Ltd
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Abstract

The utility model provides a combustion device of a multifunctional tangentially fired pulverized coal boiler. A stable-combustion function area, a deoxidation function area, an oxidation function area, a flame buffering function area, a deoxidation function area, an oxidation function area, a burnout function area, a flame buffering function area and a burnout function area are arranged in a vertical space in a hearth from bottom to top in sequence; primary air nozzles of the stable-combustion function area and the deoxidation function area are rectangular; the inner periphery of each primary air nozzle is an abnormally-shaped blunt teeth structure, and the middle part is a tooth-shaped blunt body. With reasonable arrangement of the function areas in the combustion device in the boiler and special structure design of the primary air nozzles and with the addition of accurate control to air or fuel classification in the boiler, the combustion device solves the problems that the coal combusted by the tangentially fired pulverized coal boiler has bad adaptability and bad combustion stability; a water-cooling wall of the hearth suffers slagging and can not resist high temperature and corrosion; and the like. The combustion device can reduce the emission concentration of nitrogen oxides in combustion tail gas to below 200 mg/m3; and the efficiency of the boiler can reach 93 percent as for a unit of above 300 MW.

Description

A kind of burner of multi-functional tangential firing pulverized-coal fired boiler
Technical field
The utility model belongs to the clean coal combustion technology of station boiler field, relates to a kind of burner of multi-functional tangential firing pulverized-coal fired boiler.
Background technology
In recent years, outstanding along with the imbalance between supply and demand of coal electricity, most of large-sized power boilers and the actual burning coal of station boiler be off-design and check coal and be serious degradation trend all, a large amount of colms are used for the generating plant pulverized coal boiler burning, the low inferior problem of unstability, burner hearth slagging scorification, efficiency of combustion that causes easily burning all constitutes a serious threat to safe, stable, the economical operation of boiler unit, simultaneously, the NOx discharging of boiler tail flue gas middle and high concentration causes huge pollution to environment.Significantly widen boiler to the adaptability of coal, obviously promote boiler to the steady combustion ability of colm, suppress the burner hearth slagging scorification, realize degree of depth low nitrogen burning in the stove, reduce the boiler accessory machinery station service power consumption rate and promote boiler combustion efficiency, be subjected to the great attention of each thermoelectricity enterprise and country.The circle of contact coal-dust combustion device of simple function all can not satisfy ubiquitous the problems referred to above in the large-sized station boiler running.Closely during the last ten years, China progressively adopts the introduction low NOx combusting technology, it is present domestic minimizing NOx discharging major technique source, though the independent research aspect has obtained many achievements, great majority owing to do not solve well influence thermal power plant's safety, stablize, the problem of economical operation, simultaneously, the Burner Technology of introducing not only costs an arm and a leg, and poor to the adaptability of coal, can not adapt to the changeable China's national situation of coal, can't take into account the contradiction between low nitrogen burning effect and efficiency of combustion.
The utility model content
The purpose of this utility model is at problems of the prior art, and the burner of the multi-functional tangential firing pulverized-coal fired boiler that a kind of coal adaptability is strong, combustion stability good, efficiency of combustion is high is provided.
The burner of the multi-functional tangential firing pulverized-coal fired boiler of the utility model, the layout of vertical space is followed successively by steady combustion functional areas, oxidative function district, restoring function district, flame pooling feature district, restoring function district, oxidative function district, after-flame functional areas, flame pooling feature district and after-flame functional areas from bottom to top in burner hearth.A wind snout in described steady combustion functional areas, restoring function district is a rectangle, and its inner circumference is special-shaped cognate structure, and the centre is the profile of tooth bluff body.Nine functional areas form reducing atmosphere and two zones of weak oxide atmosphere on the furnace profile space, make to realize multiple functional areas on the three dimensions in stove.One time wind snout adopts special-shaped cognate and profile of tooth bluff body structure, increases the boundary that contacts with the hot flue gas of burner hearth, forms negative pressure region in the middle of spout, impels to entrainment in the stove hot flue gas and a coal dust general mood is flowed root heat, and combustion stability is good.
Be provided with the coal powder light-dark separating block in an airduct of steady combustion functional area, the angle of this coal powder light-dark separating block and airduct center line is 10~15 degree.The coal powder light-dark separating block is carried out horizontal bias to breeze airflow and is separated, and the side of waring oneself in front of a fire is a concentrated phase, and back-fire side is a dilute phase, forms fuel enrichment in the flame kernel district, has improved efficiency of combustion.
On burner relevant parameter control technology, according to the coal of being burnt, the speed of surely firing a wind snout air-flow in the functional areas is controlled in the scope that is complementary with this coal, guarantee the ignition distance of this layer breeze airflow, to improve the tonifying Qi condition of breeze airflow, arrive the function of steady combustion.
The concrete division of above-mentioned each functional area is as follows: from the cold slag flex point of burner hearth, steady combustion functional areas are 6~8 meters along the height of burner hearth, the restoring function district is 8~10 meters along the height of burner hearth, the oxidative function district is 10~12 meters along the height of burner hearth, flame pooling feature district is 12~14 meters along the height of burner hearth, the restoring function district is 14~16 meters along the height of burner hearth, the oxidative function district is along 16~18 meters of the height of burner hearth, the after-flame functional areas are 18~19 meters along the height of burner hearth, flame pooling feature district is 20~24 meters along the height of burner hearth, and the after-flame functional areas are 24~26 meters along the height of burner hearth.
The utility model has the following advantages with respect to prior art:
1, passes through the unique texture design of a wind snout of reasonable Arrangement of each functional area in the stove internal combustion device, add accurate control to furnace air classification or fuel-staged combustion, give full play to the effect of each functional area in circle of contact stove on the three dimensions, the coal adaptability that has solved puzzlement circle of contact coal powder boiler combustion is poor, discharged nitrous oxides concentration height in the poor combustion stability, combustion tail gas, furnace wall cooling slagging scorification, water wall high temperature corrosion, efficiency of combustion are low, the problems such as power consumption height of boiler three big blower fans.
2, coal adaptability is strong, can adapt to the coal that changes in combustible basis fugitive constituent Vdaf:8 ~ 50%, ash content Aad:5 ~ 45%, the caloric value Qar:15 ~ 28Mj/kg scope; Discharged nitrous oxides concentration reaches 200mg/m in the flue gas 3Below (convert 6%O 2).
3, not slagging scorification of boiler long-time running; The water wall surface high temperature corrosion is eliminated; The minimum steady combustion load of oil of not throwing reaches below 50%.The utility model is for the above unit of 300MW, under the stable situation of burning coal, can make that discharged nitrous oxides concentration drops to 200mg/m in the combustion tail gas 3Below (convert 6%O 2), boiler efficiency can reach 93%, solved industry and can't take into account contradiction between low nitrogen burning effect and efficiency of combustion for a long time.
4, the utility model is applicable to the tangential firing boiler under the various capacity, for the transformation of old unit, keeps the boiler body profile constant, and construction is simple; For newly-built unit, do not increase any equipment and investment.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the section structure schematic diagram of the utility model rectangle wind snout;
Fig. 3 surely fires the layout drawing of coal powder light-dark separating block in airduct of functional area for the utility model;
Fig. 4 is the utility model boiler furnace sectional schematic diagram;
Wherein, α is general mood stream and the angle of downstream wall-cooling surface; φ is general mood stream and the angle of upstream side wall-cooling surface, φ and α complementation, and ξ is the declinate of primary and secondary air;
Fig. 5 is an excess air coefficient distribution schematic diagram in the utility model stove.
The specific embodiment
Be described further below by the burner and the control method thereof of specific embodiment the multi-functional tangential firing pulverized-coal fired boiler of the utility model.
(1) burner of multi-functional tangential firing pulverized-coal fired boiler
The layout of vertical space is followed successively by steady combustion functional areas 1, restoring function district 2, oxidative function district 3, flame pooling feature district 4, restoring function district 5, oxidative function district 6, after-flame functional areas 7, flame pooling feature district 8 and 9 nine functional areas, after-flame functional areas (referring to Fig. 1) from bottom to top in burner hearth.
With the 300MW unit is example, and the concrete division of each functional area is as follows:
From the cold slag flex point of burner hearth, steady combustion functional areas 1 are 6~8 meters along the height of burner hearth, restoring function district 2 is 8~10 meters along the height of burner hearth, oxidative function district 3 is 10~12 meters along the height of burner hearth, flame pooling feature district 4 is 12~14 meters along the height of burner hearth, restoring function district 5 is 14~16 meters along the height of burner hearth, oxidative function district 6 is along 16~18 meters of the height of burner hearth, after-flame functional areas 7 are 18~19 meters along the height of burner hearth, flame pooling feature district 8 is 20~24 meters along the height of burner hearth, and after-flame functional areas 9 are 24~26 meters along the height of burner hearth.
Steady combustion functional areas 1, a wind snout in restoring function district 2,5 is a rectangle, its inner circumference is special-shaped cognate structure 10, the centre is that profile of tooth bluff body 11(is referring to Fig. 2).A wind snout in other zones is identical with a conventional wind snout.
Be furnished with wind snout of 2~3 floor in steady combustion functional areas 1 and 2 liang of zones, restoring function district, in restoring function district 5, arrange 1~2 layer of wind snout, each distinguishes the position of a wind snout in four jiaos in burner hearth.
Be provided with coal powder light-dark separating block 12 in an airduct of steady combustion functional areas, its angle with the airduct center line is 12~15 to spend.
Above-mentioned nine functional areas form reducing atmosphere and two zones of weak oxide atmosphere on the furnace profile space, make to realize multiple functional areas on the three dimensions in stove.
Each regional technical parameter control method of the utility model is as follows:
A general mood of steady combustion functional areas 1 flows and the angle α of downstream wall-cooling surface is 39~45 degree, general mood stream is 45~51 degree with the included angle of upstream side wall-cooling surface, and φ and α complementation, the ignition distance that has guaranteed this layer breeze airflow is at 0.8~1.2 meter, improve the tonifying Qi condition of breeze airflow, arrive the function of steady combustion.
The declinate ξ of the primary and secondary air in restoring function district 2 is 10 ~ 12 degree, has reduced the interference of secondary wind to a wind as far as possible; Excess air coefficient in simultaneously should the zone controls between 0.65~0.7, form strong reducing atmosphere in the flame kernel zone, so just can suppress fuel NO greatly generates, this regional ignition temperature also is effectively controlled, thereby the growing amount of thermal NO also reduces significantly.
The excess air coefficient in oxidative function district 3 controls between 0.85~0.9, guarantees that coke granule is in the necessary air capacity of this zonal combustion.
There is not a secondary wind to enter in the flame pooling feature district 4,8, the bottom combustion flame rises to this zone and cushions later on, on the one hand, delay the rate of climb of flame, create time conditions for the after-flame of coke granule, on the other hand, effectively reduce weight, prevent that burning from too concentrating and cause the water-cooling wall coking for flame.
Restoring function district 5,6 two functional areas in oxidative function district are consistent with the effect and the technological parameter in above-mentioned restoring function district 2, oxidative function district 3 respectively, purpose is the excess air coefficient in the whole primary combustion zone is controlled to class sine curve situation, can guarantee degree of depth low nitrogen burning like this, can guarantee not slagging scorification of furnace wall cooling again, can also guarantee that coke granule has higher burn-off rate at primary combustion zone.
Excess air coefficients in the after-flame functional areas 7 are controlled at 1.0~1.05, further replenish the coke granule necessary air capacity of burning.
The height that after-flame functional areas 9 are about 8~9 meters apart from the primary combustion zone top, this regional excess air coefficient is controlled at 1.1~1.15, to guarantee the abundant after-flame of coke granule, excess air coefficient less than normal 0.1~0.15 in the more conventional combustion system stove.

Claims (3)

1. the burner of a multi-functional tangential firing pulverized-coal fired boiler is characterized in that: the layout of vertical space is followed successively by steady combustion functional areas (1), restoring function district (2) oxidative function districts (3), flame pooling feature district (4), restoring function district (5), oxidative function district (6), after-flame functional areas (7), flame pooling feature district (8) and after-flame functional areas (9) from bottom to top in burner hearth; From the cold slag flex point of burner hearth, steady combustion functional areas (1) are 6~8 meters along the height of burner hearth, restoring function district (2) is 8~10 meters along the height of burner hearth, oxidative function district (3) is 10~12 meters along the height of burner hearth, flame pooling feature district (4) is 12~14 meters along the height of burner hearth, restoring function district (5) is 14~16 meters along the height of burner hearth, oxidative function district (6) is along 16~18 meters of the height of burner hearth, after-flame functional areas (7) are 18~19 meters along the height of burner hearth, flame pooling feature district (8) is 20~24 meters along the height of burner hearth, and after-flame functional areas (9) are 24~26 meters along the height of burner hearth; A wind snout of described steady combustion functional areas (1), restoring function district (2,5) is a rectangle, and its inner circumference is a special-shaped cognate structure (10), and the centre is profile of tooth bluff body (11).
2. the burner of multi-functional according to claim 1 tangential firing pulverized-coal fired boiler is characterized in that: surely fire an interior airduct of functional areas (1) and be provided with coal powder light-dark separating block (12).
3. as the burner of multi-functional tangential firing pulverized-coal fired boiler as described in the claim 2, it is characterized in that: described coal powder light-dark separating block (12) is 12~15 degree with the angle of airduct center line.
CN2011201505005U 2011-05-12 2011-05-12 Combustion device of multifunctional tangentially fired pulverized coal boiler Expired - Lifetime CN202056867U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN2011201505005U CN202056867U (en) 2011-05-12 2011-05-12 Combustion device of multifunctional tangentially fired pulverized coal boiler

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102226519A (en) * 2011-05-12 2011-10-26 甘肃宏发电力工程技术有限公司 Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof
CN104329669A (en) * 2014-10-15 2015-02-04 上海发电设备成套设计研究院 Bitangent circular thick and thin separation adjustable direct-current coal powder combustor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102226519A (en) * 2011-05-12 2011-10-26 甘肃宏发电力工程技术有限公司 Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof
CN102226519B (en) * 2011-05-12 2013-05-15 甘肃宏发电力工程技术有限公司 Control method of combustion device of multifunction tangential firing pulverized coal boiler
CN104329669A (en) * 2014-10-15 2015-02-04 上海发电设备成套设计研究院 Bitangent circular thick and thin separation adjustable direct-current coal powder combustor

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Granted publication date: 20111130