CN102242927B - Low-oxynitride burning device for liquid slagging W flame boiler - Google Patents
Low-oxynitride burning device for liquid slagging W flame boiler Download PDFInfo
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- CN102242927B CN102242927B CN 201110111706 CN201110111706A CN102242927B CN 102242927 B CN102242927 B CN 102242927B CN 201110111706 CN201110111706 CN 201110111706 CN 201110111706 A CN201110111706 A CN 201110111706A CN 102242927 B CN102242927 B CN 102242927B
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Abstract
The invention discloses to a low-oxynitride burning device for a liquid slagging W flame boiler, and relates to a low-oxynitride burning device of a W flame boiler. The burning device can be used for solving the problems of low graded burning degree and high NOx emission caused by high air coefficient of primary wind and secondary wind in the existing low-oxynitride burning device. The low-oxynitride burning device provided by the invention is characterized in that the middle parts of the external side walls of two burning chambers are respectively symmetrically provided with a group of first graded wind nozzles; one group of first graded wind nozzles are arranged above each group of first tertiary wind nozzles, and a first graded wind branch pipe is installed on each first graded wind nozzle; and a first graded wind regulating baffle is arranged on each first graded wind branch pipe, a second graded wind branch pipe is positioned on between two slag screens, each second graded wind branch pipe is communicated with a slag cooling chamber, the quantity of the second graded wind branch pipes is consistent with that of second graded wind regulating baffles, and the second graded wind regulating baffles are arranged the second graded wind branch pipe. The burning device is used in a coal-fired boiler.
Description
Technical field
The present invention relates to a kind of low nitrogen oxide burning device of W flame boiler, the air coefficient that is specifically related to a kind of secondary wind can be reduced to 0.45～0.55 the low nitrogen oxide burning device that is used for slag tap W flame boiler.
Background technology
The W flame boiler that Deutsche Babcock Werke manufactures and designs is a kind of super-pressure, band fly ash reinjection system, the tower direct current cooker of slag tap.The boiler furnace part is made up of primary furnace and dreg cooling chamber that is covered with water-cooling wall on every side of two enclosed burner hearths.Boiler combustion device comprises WSD type cyclone classification burner and staged air distribution device as shown in Figure 2, and 16 WSD type cyclone classification burners divide four misarrangements row to be arranged in the top of and arranged on left and right sides combustion chamber; The burner mid portion is a central air hose, in be furnished with oil gun and burning torch; Center wind is radially arranged primary wind and powder pipe, secondary air channel I and secondary air channel II outward successively; Arrange 4 fly-ash reburning devices respectively under two combustion chamber external wall ceilings, 8 high-speed jet tertiary airs of lower disposed I nozzle, arrange 4 high-speed jet tertiary air II nozzles respectively at the forward and backward wall of catching slag screen downstream, wherein combustion system adopts secondary wind, tertiary air I and tertiary air II, totally 3 grades of air classification burnings, the air coefficient of a wind is 0.25, the air coefficient of secondary wind is 0.65, the air coefficient of tertiary air I is respectively 0.15, the air coefficient of tertiary air II is 0.1, the air classification degree is low, from reducing NO
xThe angle of discharging, the air coefficient in former combustion system burner outlet zone is 0.9, this coefficient is higher.
At present, use the above-mentioned type boiler to use bituminous coal in China, this boiler economy is higher, but NO
xDischarge capacity is higher, up to 1000mg/m
3, can't satisfy the environmental requirement of increasingly stringent.
To sum up, the higher fractional combustion degree NO of causing on the low side that causes of the air coefficient of the primary and secondary air of existing low nitrogen oxide burning device
xThe discharge capacity height.
Summary of the invention
The present invention is higher on the low side, the NO of fractional combustion degree that causes of air coefficient of the secondary wind of the existing low nitrogen oxide burning device of solution
xThe problem that discharge capacity is high, and then provide a kind of air coefficient of secondary wind can reduce to 0.45～0.55 the low nitrogen oxide burning device that is used for slag tap W flame boiler.
The present invention solves the problems of the technologies described above the technical scheme of taking to be:
The air coefficient of secondary wind of the present invention can be reduced to 0.45～0.55 the low nitrogen oxide burning device that is used for slag tap W flame boiler and be comprised 16 WSD type cyclone classification burners, eight fly ash reinjection systems, 16 tertiary air first arms, 16 tertiary air first controllable registers, eight tertiary air second arms, eight tertiary air second controllable registers, two combustion chambers, catch slag screen and a dreg cooling chamber for two, the upper end of each combustion chamber is provided with eight WSD type cyclone classification burners, eight fly ash reinjection systems are symmetricly set on the top of two combustion chamber lateral walls, 16 tertiary air first spouts are symmetricly set on the middle part of two combustion chamber lateral walls, each tertiary air first spout place is equipped with tertiary air first arm, the consistent setting of quantity of the quantity of tertiary air first arm and tertiary air first controllable register, each tertiary air first arm is provided with tertiary air first controllable register, eight tertiary air second arms are installed in the middle part of burner front side wall, each tertiary air second arm is provided with tertiary air second controllable register, dreg cooling chamber is arranged on the center in the burner, and the below of dreg cooling chamber is symmetrically arranged with two and catches the slag screen; Described burner also comprises two component level wind, first arm, two component level wind, first controllable register, one component level wind second arm and a component level wind second controllable register, the middle part of described two combustion chamber lateral walls is symmetrily processed with a component level wind first spout, the top of every group of tertiary air first spout is provided with a component level wind first spout, the consistent setting of quantity of the quantity of classification wind first spout and classification wind first arm, each classification wind first spout place is equipped with classification wind first arm, the consistent setting of quantity of the quantity of classification wind first controllable register and classification wind first arm, each classification wind first arm is provided with classification wind first controllable register, classification wind second arm is caught between the slag screen at two, each classification wind second arm is communicated with equal dreg cooling chamber, the consistent setting of quantity of the quantity of classification wind second arm and classification wind second controllable register, each classification wind second arm is provided with classification wind second controllable register.
The invention has the beneficial effects as follows:
1, the present invention has increased two-stage classification wind on existing low nitrogen oxide burning device basic, be respectively the first classification wind and the second classification wind, thereby formed the burning of Pyatyi air classification, the air coefficient of wind, tertiary air I and a tertiary air II is constant, the air coefficient of secondary wind is reduced to 0.45～0.55, the air coefficient of the first classification wind and the second classification wind is 0.1～0.2, the air classification degree improves, the air coefficient of burner exit region reduces to 0.7～0.8, the reducing atmosphere at burning initial stage strengthens, and helps reducing NO
xGrowing amount, this moment NO
xGrowing amount reduced more than 35%;
2, burner outlet regional air coefficient reduces, carbon in the fuel and the CO that burns and produce
2Reaction speed is accelerated, and generates more CO, and burning initial stage reducing atmosphere further strengthens, thereby suppresses NO
xGeneration, NO
xReduce approximately 10%～15%, to sum up the present invention compares NO with existing low nitrogen oxide burning device
xGrowing amount has reduced about 50%;
3, bituminous coal volatile matter content height of the present invention, the combustion chamber up to 1800 ℃ temperature conditions under, volatile matter is separated out rapidly, simultaneously the CO that can produce with burning of the carbon in the fuel
2Reduction reaction takes place generate CO, coal dust is in the gasification, and combustion state in the combustion chamber, the present invention compares burner exit region reducing atmosphere and strengthens with existing low nitrogen oxide burning device, gasification rate is accelerated on the contrary, along with classification wind and tertiary air feed step by step, unburned gas burns gradually, after the second classification wind infeeds, go into the total air coefficient of stove and reach 1.15, can guarantee that unburned gas falls the regional completing combustion of " V " shape top at burner;
4, the present invention has increased two-stage classification wind, the second classification wind is arranged in catches after the slag screen, its air coefficient is 0.5～0.1, so the air coefficient in the combustion chamber is reduced to 0.95～1.0, bottom, combustion chamber reducing atmosphere strengthens, and air coefficient reduces in the combustion chamber, carbon in the fuel and the CO that burns and produce
2Reaction speed is accelerated, generate more CO, reducing atmosphere is further strengthened, the fusing point of lime-ash is with the change of properties of atmosphere, ash fusion point height in oxidizing atmosphere, ash fusion point is low in reducing atmosphere, so the easier formation molten condition of slag, help slag tap, guarantee boiler safety, stable operation.
Description of drawings
Fig. 1 is the overall structure front view of burner of the present invention, and Fig. 2 is the burner front view of the W flame boiler that manufactures and designs of existing Babcock company.
The specific embodiment
The specific embodiment one: as shown in Figure 1, the air coefficient of the secondary wind of present embodiment can be reduced to 0.45～0.55 the low nitrogen oxide burning device that is used for slag tap W flame boiler and be comprised 16 WSD type cyclone classification burners 1, eight fly ash reinjection systems 2,16 tertiary air first arms 3,16 tertiary air first controllable registers 5, eight tertiary air second arms 6, eight tertiary air second controllable registers 8, two combustion chambers 15, catch 16 and dreg cooling chamber 17 of slag screen for two, the upper end of each combustion chamber 15 is provided with eight WSD type cyclone classification burners 1, eight fly ash reinjection systems 2 are symmetricly set on the top of two combustion chamber 15 lateral walls, 16 tertiary air first spouts 4 are symmetricly set on the middle part of two combustion chamber 15 lateral walls, each tertiary air first spout 4 place is equipped with a tertiary air first arm 3, the consistent setting of quantity of the quantity of tertiary air first arm 3 and tertiary air first controllable register 5, each tertiary air first arm 3 is provided with a tertiary air first controllable register 5, eight tertiary air second arms 6 are installed in the middle part of burner front side wall, each tertiary air second arm 6 is provided with a tertiary air second controllable register 8, dreg cooling chamber 17 is arranged on the center in the burner, and the below of dreg cooling chamber 17 is symmetrically arranged with two and catches slag screen 16; Described burner also comprises two component level wind, first arm 9, two component level wind, first controllable register 11, one component level wind, second arm 12 and a component level wind second controllable register 14, the middle part of described two combustion chamber 15 lateral walls is symmetrily processed with a component level wind first spout 10, the top of every group of tertiary air first spout 4 is provided with a component level wind first spout 10, the consistent setting of quantity of the quantity of classification wind first spout 10 and classification wind first arm 9, each classification wind first spout 10 place is equipped with a classification wind first arm 9, the consistent setting of quantity of the quantity of classification wind first controllable register 11 and classification wind first arm 9, each classification wind first arm 9 is provided with a classification wind first controllable register 11, classification wind second arm 12 is caught between the slag screen 16 at two, each classification wind second arm 12 all is communicated with dreg cooling chamber 17, the consistent setting of quantity of the quantity of classification wind second arm 12 and classification wind second controllable register 14, each classification wind second arm 12 is provided with a classification wind second controllable register 14.
The specific embodiment two: as shown in Figure 1, the quantity of the every component level of present embodiment wind first arm 9 is four～eight.So design can make the first classification wind in classification wind first arm 9 evenly distribute in combustion chamber 15, and the first classification wind that helps in classification wind first arm 9 fully mixes with combustion chamber 15 interior flue gases.Other compositions and annexation are identical with the specific embodiment one.
The specific embodiment three: as shown in Figure 1, the quantity of the every component level of present embodiment wind second arm 12 is four～eight.So design can make the second classification wind in classification wind second arm 12 evenly distribute dreg cooling chamber 17 in, and the second classification wind that helps in classification wind second arm 12 fully mixes with dreg cooling chamber 17 interior flue gases.Other compositions and annexation are identical with the specific embodiment one or two.
Operation principle:
Breeze airflow enters burner hearth by the primary wind and powder pipe, is lighted under the effect of the high temperature recirculation zone that turbulent burner 1 produces.In, outer secondary wind provides coal dust firing initial stage required air, a wind is from inside to outside gradually with interior, outer secondary wind mixes, the flue gas that coal dust firing produces from up to down flows, enter the first via classification wind of combustion chamber 15 successively with classification wind first arm 9, the first via tertiary air that tertiary air first arm 3 enters combustion chamber 15 mixes, the slag of molten condition is discharged with liquid form 15 bottoms in the combustion chamber, after the flue gas turnover is upwards flowed, through catching slag screen 17, enter the second road tertiary air of combustion chamber 15 successively with tertiary air second arm 6, the second tunnel classification wind that classification wind second arm 12 enters combustion chamber 15 mixes, thereby form the burning of Pyatyi air classification, help reducing the NOx discharge capacity.
Claims (3)
1. the air coefficient of a secondary wind can be reduced to 0.45～0.55 the low nitrogen oxide burning device that is used for slag tap W flame boiler, described burner comprises 16 WSD type cyclone classification burners (1), eight fly ash reinjection systems (2), 16 tertiary air first arms (3), 16 tertiary air first controllable registers (5), eight tertiary air second arms (6), eight tertiary air second controllable registers (8), two combustion chambers (15), catch slag screen (16) and a dreg cooling chamber (17) for two, the upper end of each combustion chamber (15) is provided with eight WSD type cyclone classification burners (1), eight fly ash reinjection systems (2) are symmetricly set on the top of two combustion chambers (15) lateral wall, 16 tertiary air first spouts (4) are symmetricly set on the middle part of two combustion chambers (15) lateral wall, each tertiary air first spout (4) locates to be equipped with tertiary air first arm (3), the consistent setting of quantity of the quantity of tertiary air first arm (3) and tertiary air first controllable register (5), each tertiary air first arm (3) is provided with tertiary air first controllable register (5), eight tertiary air second arms (6) are installed in the middle part of burner front side wall, each tertiary air second arm (6) is provided with tertiary air second controllable register (8), dreg cooling chamber (17) is arranged on the center in the burner, and the below of dreg cooling chamber (17) is symmetrically arranged with two and catches slag screen (16); It is characterized in that: described burner also comprises two component level wind first arms (9), two component level wind first controllable registers (11), one component level wind second arm (12) and component level wind second controllable register (14), the middle part of described two combustion chambers (15) lateral wall is symmetrily processed with component level wind first spout (10), the top of every group of tertiary air first spout (4) is provided with component level wind first spout (10), the consistent setting of quantity of the quantity of classification wind first spout (10) and classification wind first arm (9), each classification wind first spout (10) locates to be equipped with classification wind first arm (9), the consistent setting of quantity of the quantity of classification wind first controllable register (11) and classification wind first arm (9), each classification wind first arm (9) is provided with classification wind first controllable register (11), classification wind second arm (12) is positioned at two and catches between the slag screen (16), each classification wind second arm (12) all is communicated with dreg cooling chamber (17), the consistent setting of quantity of the quantity of classification wind second arm (12) and classification wind second controllable register (14), each classification wind second arm (12) is provided with classification wind second controllable register (14).
2. the air coefficient of secondary wind according to claim 1 can be reduced to 0.45～0.55 the low nitrogen oxide burning device that is used for slag tap W flame boiler, it is characterized in that: the quantity of every component level wind first arm (9) is four～eight.
3. the air coefficient of secondary wind according to claim 1 and 2 can be reduced to 0.45～0.55 the low nitrogen oxide burning device that is used for slag tap W flame boiler, it is characterized in that: the quantity of every component level wind second arm (12) is four～eight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110111706 CN102242927B (en) | 2011-04-29 | 2011-04-29 | Low-oxynitride burning device for liquid slagging W flame boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110111706 CN102242927B (en) | 2011-04-29 | 2011-04-29 | Low-oxynitride burning device for liquid slagging W flame boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102242927A CN102242927A (en) | 2011-11-16 |
| CN102242927B true CN102242927B (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110111706 Expired - Fee Related CN102242927B (en) | 2011-04-29 | 2011-04-29 | Low-oxynitride burning device for liquid slagging W flame boiler |
Country Status (1)
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| CN (1) | CN102242927B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0268403A (en) * | 1988-09-02 | 1990-03-07 | Babcock Hitachi Kk | Solid fuel burner |
| CN101701705A (en) * | 2009-11-30 | 2010-05-05 | 哈尔滨工业大学 | W-flame boiler of secondary air split-ventilation chamber with dusting function |
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2011
- 2011-04-29 CN CN 201110111706 patent/CN102242927B/en not_active Expired - Fee Related
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| CN102242927A (en) | 2011-11-16 |
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Granted publication date: 20130724 Termination date: 20140429 |