CN102226519A - Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof - Google Patents
Combustion device of multifunction tangential firing pulverized coal boiler and control method thereof Download PDFInfo
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- CN102226519A CN102226519A CN2011101224843A CN201110122484A CN102226519A CN 102226519 A CN102226519 A CN 102226519A CN 2011101224843 A CN2011101224843 A CN 2011101224843A CN 201110122484 A CN201110122484 A CN 201110122484A CN 102226519 A CN102226519 A CN 102226519A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 55
- 239000003245 coal Substances 0.000 title claims abstract description 42
- 238000010304 firing Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 17
- 210000004894 snout Anatomy 0.000 claims description 15
- 238000011176 pooling Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- 230000036651 mood Effects 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- 239000000567 combustion gas Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000000571 coke Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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 the clean coal combustion technology of station boiler field, relate to a kind of burner of multi-functional tangential firing pulverized-coal fired boiler; The present invention also relates to a kind of control method of multi-functional tangential firing coal powder boiler combustion device 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, 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.
Summary of the invention
The objective of the invention is at problems of the prior art, 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.
Another object of the present invention provides a kind of control method of multi-functional tangential firing coal powder boiler combustion device.
The burner of the multi-functional tangential firing pulverized-coal fired 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 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.Specific as follows: for combustion medium is meager coal, and its wind snout air velocity is controlled at 22～24m/s; For combustion medium is bituminous coal, and its wind snout air velocity is controlled at 28～30m/s; For combustion medium is brown coal, and 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, and the after-flame functional areas are 24～26 meters along the height of burner hearth.
The control method of the burner of the multi-functional tangential firing pulverized-coal fired 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 complementation;
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 the described after-flame functional areas is controlled at 1.0～1.05;
Excess air coefficient in the 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, 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 present invention 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 present invention 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 invention;
Fig. 2 is the section structure schematic diagram of rectangle wind snout of the present invention;
Fig. 3 surely fires the layout drawing of coal powder light-dark separating block in airduct of functional area for the present invention;
Fig. 4 is a 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 the stove of the present invention.
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 present invention.
(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.
A wind snout in steady combustion functional areas 1, restoring function district 2,5 is a 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 2 liang of zones, restoring function district, in restoring function district 5, arrange 2 layers 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.
(2) control of the burner of multi-functional tangential firing pulverized-coal fired 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 and the included angle of upstream side wall-cooling surface is 45～51 degree, 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.
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 (4)
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.
4. the control method of the burner of multi-functional according to claim 1 tangential firing pulverized-coal fired boiler is characterized in that:
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 complementation;
The declinate ξ of the primary and secondary air in described 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 oxidative function district (3,6) controls between 0.85～0.9;
Excess air coefficient in the described after-flame functional areas (7) is controlled at 1.0～1.05;
Excess air coefficient in the described after-flame functional areas (9) is controlled at 1.1～1.15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110122484 CN102226519B (en) | 2011-05-12 | 2011-05-12 | Control method of combustion device of multifunction tangential firing pulverized coal boiler |
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|---|---|---|---|
| CN 201110122484 CN102226519B (en) | 2011-05-12 | 2011-05-12 | Control method of combustion device of multifunction tangential firing pulverized coal boiler |
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| CN102226519A true CN102226519A (en) | 2011-10-26 |
| CN102226519B CN102226519B (en) | 2013-05-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423765A (en) * | 2013-08-29 | 2013-12-04 | 国家电网公司 | Air distribution coupling burning method and system for reducing NOX exhaust |
| CN109764354A (en) * | 2018-12-11 | 2019-05-17 | 天津钢铁集团有限公司 | A kind of low nitrogen burning control method |
| CN110793195A (en) * | 2019-10-14 | 2020-02-14 | 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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| 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 |
-
2011
- 2011-05-12 CN CN 201110122484 patent/CN102226519B/en not_active Expired - Fee Related
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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423765A (en) * | 2013-08-29 | 2013-12-04 | 国家电网公司 | Air distribution coupling burning method and system for reducing NOX exhaust |
| 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 |
| CN109764354A (en) * | 2018-12-11 | 2019-05-17 | 天津钢铁集团有限公司 | A kind of low nitrogen burning control method |
| CN110793195A (en) * | 2019-10-14 | 2020-02-14 | 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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