CN102506419A - Wall-type arranged two-stage burn-up air device - Google Patents
Wall-type arranged two-stage burn-up air device Download PDFInfo
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- CN102506419A CN102506419A CN2011103018874A CN201110301887A CN102506419A CN 102506419 A CN102506419 A CN 102506419A CN 2011103018874 A CN2011103018874 A CN 2011103018874A CN 201110301887 A CN201110301887 A CN 201110301887A CN 102506419 A CN102506419 A CN 102506419A
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Abstract
A wall-type arranged two-stage burn-up air device relates to a wall-type arranged burn-up air device which can solve the problems of low coal powder burn-up degree, high fly ash carbon content and high attemperation water flow for existing wall-type arranged boilers caused by the adoption of a single-stage burn-up air device arrangement mode that does not adapt boiler loads and coal quality fluctuation. The device comprises a plurality of first-stage burn-up air, a plurality of second-stage burn-up air, a plurality of first-stage burn-up air bellows, a plurality of second-stage burn-up air bellows, a plurality of first-stage burn-up air doors, and a plurality of second-stage burn-up air doors; a lower end of a hearth wall body is connected with an upper end of a cold ash hopper; the plurality of swirl burners are arranged on the wall body in a multilayer mode; the plurality of first-stage burn-up air are arranged on the wall body and are located above the swirl burner at the top layer; the plurality of second-stage burn-up air are arranged on the wall body and are located above the first-stage burn-up air; the plurality of first-stage burn-up air are disposed in the first-stage burn-up air bellows. The invention is applicable to boilers.
Description
Technical field
The present invention relates to the combustion exhausted wind apparatus that a kind of wall formula is arranged.
Background technology
67% of China's nitrogen oxide emission all comes from fire coal.Nitrogen oxide in the atmosphere comprises NO, NO
2, N
2O, N
2O
3, N
2O
4, N
2O
5Deng, closed usually and be called NOx.NOx can cause a series of problem of environmental pollution, jeopardizes human health, destroys ball ecological environment.Its harmfulness is embodied in, and (1) influences the organism healthy development to the toxic action of human body and plant; (2) NOx generates photochemical fog reduction visibility, and people's eyes, respiratory tract and lung had strong toxic action, and can be carcinogenic; (3) NOx endangers the tellurian body indirectly to the destruction of ozone; (4) NOx is the major pollutants that form acid rain, destroys ball ecological environment.Along with the raising of environmental requirement, country is more and more stricter to the control of NOx discharge capacity.The NOx control technology mainly is divided three classes, and the one, adopt the furnace air classification technique, the 2nd, adopt low nitrogen oxide burner, the 3rd, adopt the afterbody denitration technology.See from technology and economic angle; Adopt the out of stock technology initial stage of flue gas to have high input; Operating cost is high, and operating cost is all relevant with smoke inlet NOx concentration with the initial stage input, thereby before adopting gas denitrifying technology, adopts the technological furnace outlet NOx concentration that reduces of low nitrogen burning usually.It is limited that low nitrogen oxide burner reduces the NOx amplitude, so increasing station boiler adopts low nitrogen oxide burner and after-flame wind technology simultaneously, makes to form the whole fractional combustion of air in the stove, thereby reach the purpose that reduces the NOx discharging.Adopting more after-flame wind technical approach at present is that certain altitude is arranged one deck after-flame wind on burner top; This combustion exhausted wind apparatus arrangement can reduce the NOx discharge capacity to a certain extent, but when load and ature of coal generation fluctuation, after-flame wind air quantity reduces; Wind speed is low; Problems such as penetrability and mix variation causes the imperfect combustion of coal dust, and unburned carbon in flue dust is high, spray water flux is big.
Summary of the invention
The objective of the invention is for solving the boiler that existing wall formula is arranged; Because of adopting single-stage combustion exhausted wind apparatus arrangement can't adapt to boiler load and ature of coal fluctuation; Thereby cause that coal dust after-flame degree is low, flying dust carbon content height and the big problem of spray water flux, and then the two-stage over-fire wind apparatus that provides a kind of wall formula to arrange.
The present invention addresses the above problem the technical scheme of taking to be: the two-stage over-fire wind apparatus that a kind of wall formula of the present invention is arranged comprises furnace hopper, burner hearth body of wall and a plurality of turbulent burner; Described burner hearth body of wall comprises back wall, front wall, Zuo Qiang and You Qiang; This device also comprises a plurality of first order after-flame wind, a plurality of second level after-flame wind, a plurality of first order after-flame wind bellows, a plurality of second level after-flame wind bellows, a plurality of first order after-flame wind air door and a plurality of second level after-flame wind air door; The lower end of burner hearth body of wall is connected with the upper end of furnace hopper; Described a plurality of turbulent burner is multilayer and is arranged on the body of wall; A plurality of first order after-flame wind are arranged on the body of wall and are positioned at the top of the superiors' turbulent burner; The inlet of a plurality of first order after-flame wind is arranged in the first order after-flame wind bellows, and a plurality of second level after-flame wind is arranged on the body of wall and is positioned at the top of first order after-flame wind, and after-flame wind inlet in a plurality of second level is arranged in the after-flame wind bellows of the second level; The porch, two ends of first order after-flame wind bellows is provided with a first order after-flame wind air door, and the porch, two ends of second level after-flame wind bellows is provided with a second level after-flame wind air door.
The invention has the beneficial effects as follows: the present invention mainly shows three aspects with respect to the advantage of single-stage after-flame wind arrangement:
One, during the boiler heavy-duty service, the combustion exhausted wind apparatus technology that the present invention adopts two-stage wall formula to arrange is through regulating the air quantity of two-stage over-fire wind up and down; Thereby regulate after-flame wind wind speed, improve after-flame wind penetrability, can strengthen after-flame wind and mix with the turbulent flow of furnace high-temperature flue gas and uncombusted coke; Improve the burner hearth Combination; Make flame kernel be in rational position, when obtaining lower NOx growing amount, can unburned carbon in flue dust and spray water flux be controlled at reasonable levels.The present invention compares with single-stage after-flame wind arrangement, has increased the flexibility of Field adjustment, can adapt to coal and load variations better.
Two, in boiler at low load when operation, for single-stage after-flame wind arrangement, because after-flame wind air quantity reduces, cause after-flame wind wind speed low, and penetrability and mix variation causes the imperfect combustion of coal dust, and unburned carbon in flue dust is high.The combustion exhausted wind apparatus technology that the present invention adopts two-stage wall formula to arrange, through regulating the air quantity of two-stage over-fire wind up and down, for example after-flame wind in standard-sized sheet upper strata is closed lower floor's after-flame wind; Perhaps standard-sized sheet lower floor after-flame wind, complete shut-down upper strata after-flame wind; Guaranteed after-flame wind wind speed, can strengthen after-flame wind and mix, thereby guaranteed burn-off rate with the turbulent flow of furnace high-temperature flue gas and uncombusted coke.
Three, during the boiler heavy-duty service, for single-stage after-flame wind arrangement, after-flame wind and flue gas and uncombusted coke contact-making surface are little, can not react equably, and burn-off rate can't guarantee.The combustion exhausted wind apparatus that the present invention adopts two-stage wall formula to arrange, two-stage over-fire wind fully with mixing contacts with the uncombusted coke with flue gas, have guaranteed burn-off rate on two cross sections.
Description of drawings
Fig. 1 is overall structure front view of the present invention (the arrow direction is the flow of flue gas direction among the figure); Fig. 2 is the overall structure front view of the specific embodiment of the invention three; Fig. 3 is the overall structure front view of the specific embodiment four, and Fig. 4 is the overall structure front view of the specific embodiment five, and Fig. 5 is the overall structure front view of the specific embodiment six; Fig. 6 is the overall structure front view of the specific embodiment seven, and Fig. 7 is the overall structure front view of the specific embodiment eight.
The specific embodiment
The specific embodiment one: combine Fig. 1～Fig. 7 that this embodiment is described; The two-stage over-fire wind apparatus that a kind of wall formula of this embodiment is arranged comprises furnace hopper 1, burner hearth body of wall 13 and a plurality of turbulent burner 2; Described burner hearth body of wall 13 comprises back wall 5, front wall 6, left wall 11 and right wall 12; This device also comprises a plurality of first order after-flame wind 3, a plurality of second level after-flame wind 4, a plurality of first order after-flame wind bellows 8, a plurality of second level after-flame wind bellows 7, a plurality of first order after-flame wind air door 9 and a plurality of second level after-flame wind air door 10; The lower end of burner hearth body of wall 13 is connected with the upper end of furnace hopper 1; Described a plurality of turbulent burner 2 is multilayer and is arranged on the body of wall 13; A plurality of first order after-flame wind 3 are arranged on the body of wall 13 and are positioned at the top of the superiors' turbulent burner 2; The inlet of a plurality of first order after-flame wind 3 is arranged in the first order after-flame wind bellows 8, and a plurality of second level after-flame wind 4 is arranged on the body of wall 13 and is positioned at the top of first order after-flame wind 3, and after-flame wind 4 inlets in a plurality of second level are arranged in the second level after-flame wind bellows 7; The porch, two ends of first order after-flame wind bellows 8 is provided with a first order after-flame wind air door 9, and the porch, two ends of second level after-flame wind bellows 7 is provided with a second level after-flame wind air door 10.
The specific embodiment two: combine Fig. 1 and Fig. 2 that this embodiment is described; The described a plurality of turbulent burners 2 of this embodiment are multilayer and are arranged on front wall 6 and the back wall 5; A plurality of first order after-flame wind 3 are arranged symmetrically on front wall 6 and the back wall 5 and are positioned at the top of the superiors' turbulent burner 2, and a plurality of second level after-flame wind 4 is arranged symmetrically on front wall 6 and the back wall 5 and is positioned at the top of first order after-flame wind 3.So be provided with, more effectively improve after-flame wind penetrability, can strengthen after-flame wind and mix with the turbulent flow of furnace high-temperature flue gas and uncombusted coke; Improve the burner hearth Combination; Better guarantee burn-off rate, effectively can unburned carbon in flue dust and spray water flux be controlled at reasonable levels, meet design requirement.Other is identical with the specific embodiment one.
The specific embodiment three: combine Fig. 2 that this embodiment is described, the arrangement of the described every layer of turbulent burner 2 of this embodiment is consistent with the arrangement of first order after-flame wind 3 and second level after-flame wind 4.So be provided with, meet design requirement.Other is identical with the specific embodiment two.
The specific embodiment four: combine Fig. 3 that this embodiment is described, the arrangement of the described every layer of turbulent burner 2 of this embodiment is consistent with the arrangement of first order after-flame wind 3, second level after-flame wind 4 and first order after-flame wind 3 interlaced arrangement.So be provided with, meet design requirement.Other is identical with the specific embodiment two.
The specific embodiment five: combine Fig. 4 that this embodiment is described, the arrangement of the described every layer of turbulent burner 2 of this embodiment is consistent with the arrangement of second level after-flame wind 4, first order after-flame wind 3 and second level after-flame wind 4 interlaced arrangement.So be provided with, meet design requirement.Other is identical with the specific embodiment two.
The specific embodiment six: combine Fig. 5 that this embodiment is described, the arrangement of the described first order after-flame of this embodiment wind 3 is consistent with the arrangement of second level after-flame wind 4, every layer of turbulent burner 2 and first order after-flame wind 3 interlaced arrangement.So be provided with, meet design requirement.Other is identical with the specific embodiment two.
The specific embodiment seven: combine Fig. 6 that this embodiment is described; The described a plurality of turbulent burners 2 of this embodiment are multilayer and are arranged on the front wall 6; A plurality of first order after-flame wind 3 lateral arrangement on the front wall 6 and be positioned at the superiors' turbulent burner 2 above, a plurality of second level after-flame wind 4 lateral arrangement on the front wall 6 and be positioned at first order after-flame wind 3 above.So be provided with, meet design requirement.Other is identical with the specific embodiment one.
The specific embodiment eight: combine Fig. 7 that this embodiment is described; The described a plurality of turbulent burners 2 of this embodiment are multilayer and are arranged on the wall 5 of back; A plurality of first order after-flame wind 3 lateral arrangement the back wall 5 on and be positioned at the superiors' turbulent burner 2 above, a plurality of second level after-flame wind 4 lateral arrangement the back wall 5 on and be positioned at first order after-flame wind 3 above.So be provided with, meet design requirement.Other is identical with the specific embodiment one.
Operation principle
The present invention adopts two-stage over-fire wind apparatus (first order after-flame wind 3 and second level after-flame wind 4); The part secondary wind is caused first order after-flame wind bellows 8 and second level after-flame wind bellows 7 respectively, offer first order after-flame wind 3 and participate in burning in upper furnace with second level after-flame wind 4.In first order after-flame wind bellows 8 and after-flame wind bellows 7 porch, the second level first order after-flame wind air channel air door 9 and after-flame air channel, second level air door 10 are housed respectively; When the variation of load or ature of coal, can be in operation through the air quantity of configuration first order after-flame wind and second level after-flame wind, thereby regulate after-flame wind wind speed; Improve after-flame wind penetrability; Can strengthen after-flame wind and mix, improve the burner hearth Combination, when obtaining lower NOx growing amount with the turbulent flow of furnace high-temperature flue gas and uncombusted coke; Can unburned carbon in flue dust and spray water flux be controlled at rational numerical; Compare with single-stage after-flame wind arrangement, increased the flexibility of Field adjustment, can adapt to coal and load variations better.
Claims (8)
1. the two-stage over-fire wind apparatus arranged of a wall formula; This device comprises furnace hopper (1), burner hearth body of wall (13) and a plurality of turbulent burner (2); Described burner hearth body of wall (13) comprises back wall (5), front wall (6), left wall (11) He Youqiang (12); It is characterized in that: this device also comprises a plurality of first order after-flame wind (3), a plurality of second level after-flame wind (4), a plurality of first order after-flame wind bellows (8), a plurality of second level after-flame wind bellows (7), a plurality of first order after-flame wind air doors (9) and a plurality of second level after-flame wind air doors (10); The lower end of burner hearth body of wall (13) is connected with the upper end of furnace hopper (1); Described a plurality of turbulent burner (2) is multilayer and is arranged on the body of wall (13); A plurality of first order after-flame wind (3) are arranged in the top that the superiors' turbulent burner (2) were gone up and be positioned to body of wall (13); The inlet of a plurality of first order after-flame wind (3) is arranged in the first order after-flame wind bellows (8), and a plurality of second level after-flame wind (4) are arranged in the top that first order after-flame wind (3) was gone up and be positioned to body of wall (13), and a plurality of second level after-flame wind (4) inlet is arranged in the second level after-flame wind bellows (7); The porch, two ends of first order after-flame wind bellows (8) is provided with a first order after-flame wind air door (9), and the porch, two ends of second level after-flame wind bellows (7) is provided with a second level after-flame wind air door (10).
2. the two-stage over-fire wind apparatus that a kind of wall formula according to claim 1 is arranged; It is characterized in that: described a plurality of turbulent burners (2) are multilayer and are arranged on front wall (6) and the back wall (5); A plurality of first order after-flame wind (3) are arranged symmetrically in the top that the superiors' turbulent burner (2) were gone up and be positioned to front wall (6) and back wall (5), and a plurality of second level after-flame wind (4) are arranged symmetrically on front wall (6) and the back wall (5) and are positioned at the top of first order after-flame wind (3).
3. the two-stage over-fire wind apparatus that a kind of wall formula according to claim 2 is arranged, it is characterized in that: the arrangement of described every layer of turbulent burner (2) is consistent with the arrangement of first order after-flame wind (3) and second level after-flame wind (4).
4. the two-stage over-fire wind apparatus that a kind of wall formula according to claim 2 is arranged; It is characterized in that: the arrangement of described every layer of turbulent burner (2) is consistent with the arrangement of first order after-flame wind (3), second level after-flame wind (4) and first order after-flame wind (3) interlaced arrangement.
5. the two-stage over-fire wind apparatus that a kind of wall formula according to claim 2 is arranged; It is characterized in that: the arrangement of described every layer of turbulent burner (2) is consistent with the arrangement of second level after-flame wind (4), first order after-flame wind (3) and second level after-flame wind (4) interlaced arrangement.
6. the two-stage over-fire wind apparatus that a kind of wall formula according to claim 2 is arranged; It is characterized in that: the arrangement of described first order after-flame wind (3) is consistent with the arrangement of second level after-flame wind (4), every layer of turbulent burner (2) and first order after-flame wind (3) interlaced arrangement.
7. the two-stage over-fire wind apparatus that a kind of wall formula according to claim 1 is arranged; It is characterized in that: described a plurality of turbulent burners (2) are multilayer and are arranged on the front wall (6); A plurality of first order after-flame wind (3) lateral arrangement goes up and is positioned at the top of the superiors' turbulent burner (2) at front wall (6), and a plurality of second level after-flame wind (4) lateral arrangement goes up and be positioned at the top of first order after-flame wind (3) at front wall (6).
8. the two-stage over-fire wind apparatus that a kind of wall formula according to claim 1 is arranged; It is characterized in that: described a plurality of turbulent burners (2) are multilayer and are arranged on the back wall (5); A plurality of first order after-flame wind (3) lateral arrangement goes up and is positioned at the top of the superiors' turbulent burner (2) at Hou Qiang (5), and a plurality of second level after-flame wind (4) lateral arrangement goes up and be positioned at the top of first order after-flame wind (3) at Hou Qiang (5).
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| CN2011103018874A CN102506419A (en) | 2011-09-30 | 2011-09-30 | Wall-type arranged two-stage burn-up air device |
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| CN2011103018874A CN102506419A (en) | 2011-09-30 | 2011-09-30 | Wall-type arranged two-stage burn-up air device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335303A (en) * | 2013-06-25 | 2013-10-02 | 山西蓝天环保设备有限公司 | Three-dimensional grading OFA overfire air low-nitrogen combustion technology of vertical boiler |
| CN103697464A (en) * | 2012-09-28 | 2014-04-02 | 烟台龙源电力技术股份有限公司 | Intermediate silo-type pulverizing 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 |
| CN107830517A (en) * | 2017-05-02 | 2018-03-23 | 浙江大学 | A kind of the side wind and side combustion exhausted wind apparatus of front-back wall burning |
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| GB1506777A (en) * | 1974-07-05 | 1978-04-12 | Foster Wheeler Energy Corp | Burner assembly having a tertiary air nozzle |
| PL332429A1 (en) * | 1997-07-22 | 1999-09-13 | Steinmueller Gmbh L & C | Corner burner operation method for a chamber-type burner furnace with tangent arrangement of burners and corner burner therefor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697464A (en) * | 2012-09-28 | 2014-04-02 | 烟台龙源电力技术股份有限公司 | Intermediate silo-type pulverizing boiler |
| CN103697464B (en) * | 2012-09-28 | 2016-10-05 | 烟台龙源电力技术股份有限公司 | Warehouse formula powder process boiler in the middle of a kind of |
| CN103335303A (en) * | 2013-06-25 | 2013-10-02 | 山西蓝天环保设备有限公司 | Three-dimensional grading OFA overfire air low-nitrogen combustion technology of vertical boiler |
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| 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 |
| CN107830517A (en) * | 2017-05-02 | 2018-03-23 | 浙江大学 | A kind of the side wind and side combustion exhausted wind apparatus of front-back wall burning |
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Application publication date: 20120620 |