CN102226519B - Control method of combustion device of multifunction tangential firing pulverized coal boiler - Google Patents
Control method of combustion device of multifunction tangential firing pulverized coal boiler Download PDFInfo
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- CN102226519B CN102226519B CN 201110122484 CN201110122484A CN102226519B CN 102226519 B CN102226519 B CN 102226519B CN 201110122484 CN201110122484 CN 201110122484 CN 201110122484 A CN201110122484 A CN 201110122484A CN 102226519 B CN102226519 B CN 102226519B
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Abstract
The invention provides a combustion device of a multifunction tangential firing pulverized coal boiler. The combustion device is characterized in that a stable combustion functional zone, a reduction functional zone, an oxidation functional zone, a flame buffer functional zone, a reduction functional zone, an oxidation functional zone, a burning-out functional zone, a flame buffer functional zone and a burning-out functional zone are sequentially arranged in the vertical space in a hearth from bottom to top, wherein the primary air nozzles of the stable combustion functional zone and the reduction functional zone are rectangular, the inner peripheries of the primary air nozzles are of an odd-shaped blunt gear structure, and the middles of the primary air nozzles are toothed blunt bodies. The device can be used for solving the problem of poor flaming coal type adaptability, poor combustion stability, water cooled wall slagging in the hearth, water cooled wall high temperature corrosion and the like in the tangential firing pulverized coal boiler by virtue of reasonable arrangement of each function zone in a furnace combustion device and special structural design of the primary air nozzles as well as the accuracy control on the furnace air or fuel classification. The combustion device provided by the invention has the advantages that the nitric oxide emission concentration in combustion gas is reduced to below 200mg/m<3>, and the boiler efficiency can reach 93% for an over 300MW unit.
Description
Technical field
The invention belongs to station boiler Filter Tuber For Clean Coal field of combustion technology, relate to a kind of burner of multifunction tangential firing pulverized coal boiler; The present invention also relates to a kind of control method of multifunction tangential firing pulverized coal boiler burner simultaneously.
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, Boiler Furnace slagging, efficiency of combustion that easily causes 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 Boiler Furnace slagging, realize degree of depth low nitrogen burning in stove, reduce the boiler accessory machinery station service power consumption rate and promote boiler combustion efficiency, be subjected to the great attention of each Thermal Power Enterprises 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 reduce NOx emission major technique source, although the independent research aspect has obtained many achievements, great majority affects thermal power plant's safety owing to not solving well, stablize, the problem of economical operation, simultaneously, the Burner Technology of introducing is not only expensive, 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.
Summary of the invention
The objective of the invention is for problems of the prior art, provide that a kind of coal adaptability is strong, combustion stability good, the burner of the much higher function tangential firing of efficiency of combustion pulverized-coal fired boiler.
Another object of the present invention is to provide a kind of control method of multifunction tangential firing pulverized coal boiler burner.
The burner of multifunction tangential firing pulverized coal boiler of the present invention, 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 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 weak oxide atmosphere two zones on the furnace profile space, make and realize the several functions district on three dimensions in stove.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 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 concentrated phase, and back-fire side is dilute phase, and the district forms fuel enrichment at flame kernel, has improved efficiency of combustion.
On burner relevant parameter control technology, according to the coal of burning, the speed of surely firing a wind snout air-flow in 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.Specific as follows: be meager coal for combustion medium, its wind snout air velocity is controlled at 22～24m/s; Be bituminous coal for combustion medium, its wind snout air velocity is controlled at 28～30m/s; Be brown coal for combustion medium, its wind snout air velocity is controlled at 30～32m/s.
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, the after-flame functional areas are 24～26 meters along the height of burner hearth.
The control method of the burner of multifunction tangential firing pulverized coal boiler of the present invention is as follows:
General mood stream of described steady combustion functional areas is 39～45 degree with the angle α of downstream wall-cooling surface, and general mood stream is 45～51 degree with the included angle of upstream side wall-cooling surface, and φ and α mutually more than;
The declinate ξ of the primary and secondary air in described restoring function district is 10 ~ 12 degree; Excess air coefficient in simultaneously should the zone is controlled at 0.65～0.7;
The excess air coefficient in described oxidative function district is controlled at 0.85～0.9;
Excess air coefficient in described after-flame functional areas is controlled at 1.0～1.05;
Excess air coefficient in described after-flame functional areas is controlled at 1.1～1.15.
The present invention has the following advantages with respect to prior art:
1, pass through the unique texture design of a wind snout of reasonable Arrangement of each functional area in stove internal combustion device, add the 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 three dimensions, the coal adaptability that has solved puzzlement circle of contact coal powder boiler combustion is poor, high, the furnace wall cooling slagging scorification of discharged nitrous oxides concentration in poor combustion stability, combustion tail gas, water wall high temperature corrosion, efficiency of combustion are low, the problems such as power consumption height of boiler three large 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%, caloric value Qar:15 ~ 28Mj/kg scope; The nitrogen oxides in effluent concentration of emission reaches 200mg/m
3Below (conversion is to 6%O
2).
3, boiler moves not slagging scorification for a long time; 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, in the situation that burning coal is stable, can make that in combustion tail gas, discharged nitrous oxides concentration drops to 200mg/m
3Below (conversion is to 6%O
2), boiler efficiency can reach 93%, solved industry and can't take into account for a long time contradiction between low nitrogen burning effect and efficiency of combustion.
4, the utility model is applicable to the tangential firing boiler under various capacity, for the transformation of old unit, keeps the boiler body profile constant, and construction is simple; For new-built unit, do not increase any equipment and investment.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the section structure schematic diagram of rectangle wind snout of the present invention;
Fig. 3 is the layout drawing that coal powder light-dark separating block in airduct of functional area is surely fired in the present invention;
Fig. 4 is boiler furnace sectional schematic diagram of the present invention;
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 excess air coefficient distribution schematic diagram in stove of the present invention.
The specific embodiment
Be described further below by burner and the control method thereof of specific embodiment to multifunction tangential firing pulverized coal boiler of the present invention.
(1) burner of multifunction tangential firing pulverized coal 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 after-flame 9 nine functional areas, functional areas (referring to Fig. 1) from bottom to top in burner hearth.
Take the 300MW unit as example, 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.
A wind snout in steady combustion functional areas 1, restoring function district 2,5 is rectangle, and its inner circumference is special-shaped cognate structure 10, and 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 zone, 2 liang, district of restoring function, in the restoring function district 5, arrange 2 layers of wind snout, each position of distinguishing a wind snout is in four jiaos, 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 weak oxide atmosphere two zones on the furnace profile space, make and realize the several functions district on three dimensions in stove.
(2) control of the burner of multifunction tangential firing pulverized coal boiler
Each regional technical parameter control method of the present invention 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, φ is general mood stream is 45～51 degree with the included angle of upstream side wall-cooling surface, and φ and α mutually more than, guaranteed that the ignition distance of 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 as far as possible the interference of Secondary Air to a wind; Excess air coefficient in simultaneously should the zone controls between 0.65～0.7, in the strong reducing atmosphere of flame kernel zone formation, so just can greatly suppress fuel NO generates, this regional ignition temperature also is effectively controlled, thereby the growing amount of thermal NO also significantly reduces.
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.
Do not have a Secondary Air to enter in 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 for flame, prevent that burning from too concentrating and cause the water-cooling wall coking.
6 two, district of restoring function district 5, oxidative function functional area is consistent with effect and the technological parameter in above-mentioned restoring function district 2, oxidative function district 3 respectively, purpose is the excess air coefficient in 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 coefficient in after-flame functional areas 7 is controlled at 1.0～1.05, further replenishes the necessary air capacity of coke granule burning.
After-flame functional areas 9 are apart from the about height of 8～9 meters in primary combustion zone top, and this regional excess air coefficient is controlled at 1.1～1.15, to guarantee the abundant after-flame of coke granule, than excess air coefficient less than normal 0.1～0.15 in conventional combustion mode stove.
Claims (1)
1. the control method of the burner of a multifunction tangential firing pulverized coal boiler is characterized in that:
the burner of described multifunction tangential firing pulverized coal boiler is that the layout of vertical space in burner hearth is followed successively by steady combustion functional areas (1), the first restoring function district (2), the first oxidative function district (3), the first flame pooling feature district (4), the second restoring function district (5), the second oxidative function district (6), the first after-flame functional areas (7), the second flame pooling feature district (8) and the second after-flame functional areas (9) from bottom to top, from the cold slag flex point of burner hearth, steady combustion functional areas (1) are 6～8 meters along the height of burner hearth, the first restoring function district (2) is 8～10 meters along the height of burner hearth, the first oxidative function district (3) is 10～12 meters along the height of burner hearth, the first flame pooling feature district (4) is 12～14 meters along the height of burner hearth, the second restoring function district (5) is 14～16 meters along the height of burner hearth, the second oxidative function district (6) is along 16～18 meters of the height of burner hearth, the first after-flame functional areas (7) are 18～19 meters along the height of burner hearth, the second flame pooling feature district (8) is 20～24 meters along the height of burner hearth, the second after-flame functional areas (9) are 24～26 meters along the height of burner hearth, a wind snout in described steady combustion functional areas (1), first, second restoring function district (2,5) is rectangle, and its inner circumference is special-shaped cognate structure (10), and the centre is profile of tooth bluff body (11),
General mood stream of described steady combustion functional areas (1) is 39～45 degree with the angle α of downstream wall-cooling surface, and general mood stream is 45～51 degree with the included angle of upstream side wall-cooling surface, and φ and α mutually more than;
The declinate ξ of the primary and secondary air in described first, second restoring function district (2,5) is 10 ~ 12 degree; Excess air coefficient in simultaneously should the zone controls between 0.65～0.7;
The excess air coefficient in described first, second oxidative function district (3,6) controls between 0.85～0.9;
Excess air coefficient in described the first after-flame functional areas (7) is controlled at 1.0～1.05;
Excess air coefficient in described the second after-flame functional areas (9) is controlled at 1.1～1.15.
2. the control method of the burner of multifunction tangential firing pulverized coal boiler as claimed in claim 1, is characterized in that: be provided with coal powder light-dark separating block (12) on an airduct in steady combustion functional areas (1).
3. the control method of the burner of multifunction tangential firing pulverized coal boiler as claimed in 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.
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| CN103423765B (en) * | 2013-08-29 | 2015-10-21 | 国家电网公司 | A kind of for reducing NO xthe air distribution coupling combustion method of discharge and system |
| CN109764354B (en) * | 2018-12-11 | 2020-04-28 | 天津钢铁集团有限公司 | Low-nitrogen combustion control method |
| CN110793195B (en) * | 2019-10-14 | 2021-07-13 | 北京航化节能环保技术有限公司 | Hot-blast furnace equipment suitable for low-heating-value fuel low-oxygen combustion |
| CN113864766A (en) * | 2021-10-29 | 2021-12-31 | 山东建筑大学 | NO is arranged to U typeXUltra-low discharge pulverized coal boiler |
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| US6145454A (en) * | 1999-11-30 | 2000-11-14 | Duke Energy Corporation | Tangentially-fired furnace having reduced NOx emissions |
| CN1786564A (en) * | 2005-12-20 | 2006-06-14 | 西安热工研究院有限公司 | Spliting arranging method for new three area burner of tangential circle boiler |
| CN101290117A (en) * | 2008-05-26 | 2008-10-22 | 上海电力学院 | Recombustion burner and its application method |
| CN202056867U (en) * | 2011-05-12 | 2011-11-30 | 甘肃宏发电力工程技术有限公司 | Combustion device of multifunctional tangentially fired pulverized coal boiler |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6145454A (en) * | 1999-11-30 | 2000-11-14 | Duke Energy Corporation | Tangentially-fired furnace having reduced NOx emissions |
| CN1786564A (en) * | 2005-12-20 | 2006-06-14 | 西安热工研究院有限公司 | Spliting arranging method for new three area burner of tangential circle boiler |
| CN101290117A (en) * | 2008-05-26 | 2008-10-22 | 上海电力学院 | Recombustion burner and its application method |
| CN202056867U (en) * | 2011-05-12 | 2011-11-30 | 甘肃宏发电力工程技术有限公司 | Combustion device of multifunctional tangentially fired pulverized coal boiler |
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