CN203880693U - Boiler with controllable combustion tangential circle - Google Patents
Boiler with controllable combustion tangential circle Download PDFInfo
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- CN203880693U CN203880693U CN201420307818.3U CN201420307818U CN203880693U CN 203880693 U CN203880693 U CN 203880693U CN 201420307818 U CN201420307818 U CN 201420307818U CN 203880693 U CN203880693 U CN 203880693U
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Abstract
The utility model provides a boiler with a controllable combustion tangential circle. The boiler comprises a furnace hearth formed by surrounding of a plurality of wall surfaces, wherein the furnace hearth comprises a main combustion zone and a burnout zone, the main combustion zone and burnout zone are both provided with burners, the burners are connected with a nozzle by virtue of pipelines, a plurality of vertically arranged angle primary air nozzles and angle secondary air nozzles are arranged at corners of adjacent wall surfaces of the main combustion zone, a plurality of vertically arranged wall secondary air nozzles are arranged at the position with equal height to the secondary air of each wall surface of the main combustion zone and each nozzle faces inside the boiler and the jet direction of the nozzles can be adjusted. Since the boiler disclosed by the utility model is provided with angle secondary air nozzles and wall secondary air nozzles, when the boiler is operated, according to actual needs, the flows and jet directions of the wall secondary air nozzles and angle type secondary air nozzles can be adjusted to control the combustion and thus the size of the combustion tangential circle in the furnace hearth can be very effectively controlled, the generation of nitrogen oxides is effectively reduced and meanwhile the coking of the furnace hearth caused by near wall combustion of the burner is avoided.
Description
Technical field
The utility model relates to combustion apparatus technical field, relates in particular to the controlled boiler of a kind of circle of contact that burns.
Background technology
In the arrangement of modern boiler DC burner, main arrangement is that wind, a Secondary Air burner are all arranged in respectively the arrangement (being called for short angie type arranges) of four jiaos, burner hearth and all arrange arrangement (being called for short wall formula arranges) on the wall, finds that by numerous scholars' research in recent years these two kinds of arrangements cut both ways in actual use.Angie type is arranged in real work owing to being subject to jet tonifying Qi condition poor impact in burner both sides larger, so the burning circle of contact of burner hearth is difficult to the size that reaches suitable, there will be situation less than normal or bigger than normal.Generally, the burner hearth Actual combustion circle of contact is with bigger than normal in the majority, so, although furnace flame degree of filling is large, in stove, temperature is high, burning is strong, and combustion stability is better, and flame stroke in stove is long, the time of staying is long, also be conducive to carbon granule after-flame, but run into the coal that ash fusion point is lower, furnace wall cooling just easily produces serious coking.The characteristic that wall formula is arranged burner in contrast, therefore, is applicable to the coal of easily catching fire, coking capacity is partially strong, catches fire so use easily, and the arrangement of burner of easily arranging with regard to more employing wall formula in the heavy duty boiler of coking brown coal.In addition, during single angie type or wall formula are arranged, the mode that primary and secondary air sprays into burner hearth in close positions can cause the mixing of morning between primary and secondary air, and this makes the generation of NOx in stove more.Consider the reality that boiler burning coal often changes often, therefore, adopt single angie type or wall formula to arrange and be just difficult to adapt to this reality, so, how to allow boiler overcome the deficiency that above-mentioned angie type is arranged and wall formula is arranged, the generation that reduces nitrogen oxide just becomes this area problem demanding prompt solution.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of and prevents burner hearth coking by the control combustion circle of contact and then Optimizing Combustion tissue, controls the boiler that the nitrogen oxide in boiler generates, to overcome the above-mentioned defect of prior art.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: the controlled boiler of a kind of circle of contact that burns, comprise burner hearth, burner hearth is surrounded by multiple metopes, burner hearth comprises the burning-out zone of primary zone and top, primary zone, primary zone and burning-out zone are respectively equipped with burner, described burner is connected with spout by pipeline, the corner of the each adjacent metope in described primary zone is respectively equipped with wind snout of multiple vertically disposed angie types and angie type overfire air port, the Secondary Air isometry position of each metope in described primary zone is respectively equipped with multiple vertically disposed wall formula overfire air ports, wind snout of described angie type, angie type overfire air port and wall formula overfire air port are all towards boiler internal and all can adjust jet direction.
Preferably, wind snout of described angie type and angie type overfire air port are arranged alternately.
Preferably, on each metope of described burning-out zone, be equipped with multiple after-flame wind snouts.
Preferably, each turning of wind snout of described angie type is provided with 2～8, and described angie type overfire air port is provided with 3～20 at each turning.
Preferably, described wall formula overfire air port is respectively equipped with 3～20 on each metope.
As mentioned above, the controlled boiler of a kind of circle of contact that burns of the utility model, has following beneficial effect:
1) the utility model is in the time of real work, the hearth combustion circle of contact can lead to cross-wall type overfire air port design attitude, move pivot angle and the air quantity that puts into operation regulates, thereby the tendency of the coking while effectively avoiding using low-ash-fusion coal.
2) the utility model has changed Secondary Air in single angie type or wall formula arrangement and wind mode in close positions ejection, in the utility model, a part of Secondary Air sprays into just burned flame from metope, be conducive to improve the turbulent flow mixing intensity of this part Secondary Air and the breeze airflow that enter burning-out zone, thereby promote after-flame.
3) in the utility model, the arrangement of spout can make the supply mode of air be changed into successively and be supplied with by concentrated supply, reduce the oxygen demand at burning initial stage, reduce so on the one hand the generation of fuel type NOx, avoid on the other hand overgenerous high-temp combustion, and then be conducive to reduce the generation of thermal NO x.
4) the utility model can make thermic load more even along furnace chamber width distribution, is conducive to alleviate coking, and high temperature corrosion and water-cooling wall thermal stress are concentrated, and can also reduce furnace outlet gas temperature deviation simultaneously.
Brief description of the drawings
Fig. 1 is structure chart of the present utility model.
Fig. 2 is front view of the present utility model.
Fig. 3 is that angie type is arranged burner velocity field stimulation figure.
Fig. 4 is the utility model the first modeling of velocity field figure.
Fig. 5 is the utility model the second modeling of velocity field figure.
Fig. 6 is that angie type is arranged Temperature Field for Burner simulation drawing.
Fig. 7 is the utility model the first temperature field simulation figure.
Fig. 8 is the utility model the second temperature field simulation figure.
In figure: 1 primary zone 2 burning-out zones
11 angie type one time wind snout 12 angie type overfire air ports
13 wall formula overfire air port 21 after-flame wind snouts
Detailed description of the invention
Structure that Figure of description illustrates, ratio, size etc., all contents in order to coordinate description to disclose only, understand and read for person skilled in the art scholar, not in order to limit the enforceable qualifications of the utility model, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the utility model can produce and the object that can reach, all should still drop in the scope that technology contents that the utility model discloses can contain.Simultaneously, in this description, quote as " on ", the term such as D score, 'fornt', 'back', " centre ", also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the utility model, the change of its relativeness or adjustment, changing under technology contents, when being also considered as the enforceable category of the utility model without essence.
In the present embodiment taking brown coal coal dust as fuel, be the controlled boiler of a kind of circle of contact that burns of the utility model as illustrated in fig. 1 and 2, comprise burner hearth, burner hearth is surrounded by multiple metopes, surrounded as example by four metopes with burner hearth in the present embodiment, described burner hearth comprises the burning-out zone 2 of primary zone 1 and 1 top, primary zone, and primary zone 1 and burning-out zone 2 are respectively equipped with burner, described burner is connected with spout by pipeline, and spout is arranged on boiler.The corner of the each adjacent metope in primary zone 1 described in the utility model is respectively equipped with wind snout 11 of multiple vertically disposed angie types and angie type overfire air port 12, the Secondary Air isometry position of each metope in described primary zone 1 is respectively equipped with multiple vertically disposed wall formula overfire air ports 13, spout on wind snout 11 of described angie type, angie type overfire air port 12 and wall formula overfire air port 13 is all towards the inside of boiler and all can adjust jet direction, and wherein said wall formula overfire air port 13 can move left and right adjusts position.
In the present embodiment, wind snout 11 of described angie type and angie type overfire air port 12 are arranged alternately, prevent jet concentrate cause brown coal coal dust fully not burn; In addition, on each metope of described burning-out zone 2, be equipped with multiple after-flame wind snouts 21, and then reach brown coal coal dust and fully burn, reduce the effect of brown coal coal dust waste.The air quantity of the wind snout of after-flame described in the utility model 21 accounts for a part for Secondary Air total blast volume.In a preferred embodiment, also vertical array of described after-flame wind snout 21, and each metope is provided with two.
In the present embodiment, wind snout 11 of described angie type is respectively equipped with 2～8 at the turning of each adjacent metope, and described angie type overfire air port 12 is respectively equipped with 3～20 at the turning of each adjacent metope.Generally, in order to facilitate wind snout 11 of angie type and angie type overfire air port 12 to be arranged alternately, the number of wind snout 11 of described angie type and angie type overfire air port 12 equates that other situations are evenly arranged alternately according to specific needs.Further, in order to coordinate angie type overfire air port 13, described wall formula overfire air port 13 is also respectively equipped with 3～20 on each metope.In the present embodiment, for the ease of controlling the burning circle of contact in stove, avoid impact of flame on the wall, described each angie type overfire air port 12 and each wall formula overfire air port 13 are respectively equipped with four on same contour plane; Adjusting burning when the circle of contact, carry out the size of the control combustion circle of contact by adjusting the jet direction of jet direction, wall formula overfire air port 13 of angie type overfire air port 12 and position, brown coal coal dust is fully burnt, and then control nitrogen oxide and generate.Meanwhile, this setup also helps the oxygenating burning in later stage.
In the present embodiment, adjust for convenient left and right, described wall formula overfire air port 13 lays respectively at the centre position of each metope, in the time of work, can transform wall formula overfire air port 13 positions as required.
In the time of practical operation, keep under prerequisite that Secondary Air total blast volume is constant, the air quantity sum of each metope accounts for 20%～50% of Secondary Air total blast volume, and angie type overfire air port 12 is in most of the cases as main air quantity output.
In the time of real work, wind snout 11 of angie type first sprays into primary zone 1 by the air that carries brown coal coal dust, then angie type overfire air port 12 and wall formula overfire air port 13 are worked to primary zone jets of heated air, meanwhile, after-flame wind snout 21 is also assisted to burning-out zone jets of heated air as Secondary Air, so that brown coal coal dust is fully burnt, and then the generation of minimizing nitrogen oxide, the discharge of pollutant reduced.Angie type overfire air port 12 and wall formula overfire air port 13 can carry out the adjusting of injection direction in course of injection.
Utility model people arranges that to angie type in prior art burner mode and two kinds of different embodiments of the utility model carry out modeling of velocity field and the temperature field simulation as shown in Fig. 6-8 as in Figure 3-5, make obvious contrast from actual effect, in conjunction with Fig. 1, wherein represent respectively three kinds of different arrangements with GK1, GK2 and GK3, GK1 arranges at primary zone 1 angie type, arranges three grate firings wind snout 21 to the greatest extent at burning-out zone 2; GK2 is the utility model the first arrangement, primary zone 1 every layer of eight spout (angie type overfire air port and wall formula overfire air port number sum), in the relative GK1 of each spout, flow reduces by half, arrange three grate firings wind snout 21 to the greatest extent at burning-out zone 2, wall formula overfire air port 12 departs from one meter, center; GK3 is that the utility model primary zone the second is arranged, primary zone 1 every layer of eight spout, and in the relative GK1 of each spout, flow reduces by half, and arranges three grate firings wind snout 21 to the greatest extent at burning-out zone 2, and wall formula overfire air port 12 departs from 2 meters, center.
From speed field distribution situation, the GK2 of Fig. 4 has increased wall formula than the GK1 of Fig. 3 and has arranged, but this still can form certain speed circle of contact, but the circle of contact is be not as obvious as GK1 operating mode, and diminishes to some extent, and burner hearth degree of filling declines to some extent; The maximal rate of circle of contact circumference drops to 12m/s left and right by 16m/s left and right; As shown in Figure 5, the actual circle of contact radius of GK3 is greater than the GK2 in Fig. 4, and circle of contact formation is also better, and therefore this arrangement is ideal.
On the basis of said structure, the temperature field distribution map result as shown in Fig. 6-8, as shown in Figure 6, the burning circle of contact feature that angie type is arranged is comparatively obvious, and on burning circle of contact circumference, ignition temperature is higher, and the vast zonal combustion temperature in burner hearth middle part is lower; As shown in Figure 7,8, the violent high-temperature area that burns concentrates near each spout substantially, there is not the significantly burning circle of contact, the temperature in vast region, burner hearth middle part is higher than the operating mode of angie type arrangement, whole section temperature distributes more even, and then can control the level of the nitrogen oxide of entirety in burner hearth, thereby reaches low-nitrogen discharged, therefore, this arrangement is ideal.
In addition, if the DeGrain of its reduction of wind snout NOx is set on metope again, and increase in rain complexity and the construction costs of line arrangement, therefore utility model people draws conclusion of the present utility model on tried basis.
Draw design principle of the present utility model in conjunction with above-mentioned numerical simulation data: in the boiler of arranging at angie type, after jet is penetrated by burner nozzle, not only be subject to the impact of stream, also at the air that constantly entrainments Around Jet space, four strands of jets form the obvious circle of contact after burner hearth middle part is collected, and make gas spiral in burner hearth; Then along with the continuous increase of gas flow and the effect of entrainmenting of jet, jet main body is gradually to burner hearth limit wall deflection, now, if the decay of jet insufficient rigidity is too fast, will due to the pressure reduction on both sides, to press close to furnace wall surface current moving; On the contrary, if jet rigidity is enough, the circumferential speed of eddy flow itself provides centripetal force to make air-flow stable rotation in burner hearth, just air-flow can not be whitewashed a wall.Therefore, in actual boiler operatiopn, jet is whitewashed a wall often because the tonifying Qi condition deficiency between air-flow and furnace wall, and wall formula arranges that the mode of spout, just in time in this space, even if its amount is very little, also can well improve tonifying Qi condition.
In sum, the controlled boiler of a kind of circle of contact that burns of the utility model, on the one hand, the burner hearth circle of contact can be by the design attitude of wall fired burners, move pivot angle and the air quantity that puts into operation regulates, thus the tendency of the coking while effectively avoiding using low-ash-fusion coal; In addition on the one hand, this utility model has changed Secondary Air in single angie type or wall formula arrangement and wind mode in close positions ejection, part Secondary Air sprays into just burned flame from metope, be conducive to improve the turbulent flow mixing intensity of this part Secondary Air and the breeze airflow that enter burning-out zone, thereby promote after-flame; In addition, arrangement of the present utility model can make the supply mode of air be changed into successively and be supplied with by concentrated supply, reduce the oxygen demand at burning initial stage, reduce so on the one hand the generation of fuel type NOx, avoid on the one hand in addition overgenerous high-temp combustion, and then be conducive to reduce the generation of thermal NO x, the problem that when therefore the utility model can solve boiler combustion well, nitrogen oxide productive rate is too high, combustion rate is low.So, have very high using value thereby the utility model has effectively overcome practical problems more of the prior art.
Above-mentioned embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.The utility model also has many aspects under the prerequisite without prejudice to overall thought, to improve, and all can, under spirit of the present utility model and category, can above-described embodiment be modified or be changed for person skilled in the art scholar.Therefore, have in technical field under such as and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (5)
1. the boiler that the circle of contact that burns is controlled, comprise burner hearth, burner hearth is surrounded by multiple metopes, burner hearth comprises the burning-out zone (2) of primary zone (1) and primary zone (1) top, primary zone (1) and burning-out zone (2) are respectively equipped with burner, described burner is connected with spout by pipeline, it is characterized in that: the corner of the each adjacent metope in described primary zone (1) is respectively equipped with wind snouts of multiple vertically disposed angie types (11) and angie type overfire air port (12), the Secondary Air isometry position of each metope in described primary zone (1) is respectively equipped with multiple vertically disposed wall formula overfire air ports (13), a wind snout of described angie type (11), angie type overfire air port (12) and wall formula overfire air port (13) are all towards boiler internal and all can adjust jet direction.
2. the controlled boiler of a kind of circle of contact that burns according to claim 1, is characterized in that: a wind snout of described angie type (11) and angie type overfire air port (12) are arranged alternately.
3. the controlled boiler of a kind of circle of contact that burns according to claim 1, is characterized in that: on each metope of described burning-out zone (2), be equipped with multiple after-flame wind snouts (21).
4. the controlled boiler of a kind of circle of contact that burns according to claim 1, is characterized in that: a wind snout of described angie type (11), and each turning is provided with 2～8; Described angie type overfire air port (12) is provided with 3～20 at each turning.
5. the controlled boiler of a kind of circle of contact that burns according to claim 1, is characterized in that: described wall formula overfire air port (13) is respectively equipped with 3～20 on each metope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307818.3U CN203880693U (en) | 2014-06-10 | 2014-06-10 | Boiler with controllable combustion tangential circle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307818.3U CN203880693U (en) | 2014-06-10 | 2014-06-10 | Boiler with controllable combustion tangential circle |
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| CN203880693U true CN203880693U (en) | 2014-10-15 |
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| CN201420307818.3U Active CN203880693U (en) | 2014-06-10 | 2014-06-10 | Boiler with controllable combustion tangential circle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994423A (en) * | 2014-06-10 | 2014-08-20 | 上海交通大学 | Boiler with controllable combustion tangent circle |
| CN111536532A (en) * | 2020-05-12 | 2020-08-14 | 湖南现代环境科技股份有限公司 | Flow field and control system of household garbage incinerator |
-
2014
- 2014-06-10 CN CN201420307818.3U patent/CN203880693U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994423A (en) * | 2014-06-10 | 2014-08-20 | 上海交通大学 | Boiler with controllable combustion tangent circle |
| CN111536532A (en) * | 2020-05-12 | 2020-08-14 | 湖南现代环境科技股份有限公司 | Flow field and control system of household garbage incinerator |
| CN111536532B (en) * | 2020-05-12 | 2022-12-13 | 湖南现代环境科技股份有限公司 | Flow field and control system of household garbage incinerator |
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