CN203980331U - Prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove - Google Patents

Prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove Download PDF

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Publication number
CN203980331U
CN203980331U CN201420385753.4U CN201420385753U CN203980331U CN 203980331 U CN203980331 U CN 203980331U CN 201420385753 U CN201420385753 U CN 201420385753U CN 203980331 U CN203980331 U CN 203980331U
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scorch
jiaos
burner hearth
wall
airduct
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缪淼
陈刚
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Dongfang Boiler Group Co Ltd
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Dongfang Boiler Group Co Ltd
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Abstract

The utility model discloses the anti-scorch wind system that one prevents four jiaos of serious cokings of " W " stove, comprise burner hearth, anti-scorch wind apparatus and anti-scorch airduct, described burner hearth is square, formed by water screen tube, burner hearth comprises stokehold wall, wall after stove, be positioned at the furnace side wall of both sides and connect the aileron of adjacent two furnace walls, on the water screen tube of aileron, arrange for anti-scorch airduct from the outer gap toward passing in burner hearth, anti-scorch airduct is arranged on aileron along the direction of parallel sides furnace wall, the incoming end of anti-scorch airduct is arranged in the total air channel of Secondary Air of four jiaos, burner hearth, outlet air end is arranged on aileron.The utility model prevents the anti-scorch wind system of four jiaos of serious cokings of " W " stove, the oxygen amount of improving four jiaos of water-cooling wall walls of burner hearth by introducing anti-scorch wind distributes and flue gas flow field, alleviate the degradation degree of high-temperature flue gas to side water wall, play the effect that prevents this serious coking in region; Reduce the generation of NOx in combustion process, accomplish the discharge of efficient burning, low NOx and prevent the unification of coking.

Description

Prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove
Technical field
The utility model relates to one to be prevented from the anti-scorch wind system of four jiaos of serious cokings of " W " stove belonging to boiler technology field.
Background technology
Along with Environmental Protection in China administer increasingly strict, the discharge index of the pollutants such as nitrogen oxide is required more and more lower, the NOx discharge of " W " stove is high seems particularly outstanding in the various type of furnaces.Present each power plant carries out low nitrogen burning transformation one after another, how after low nitrogen burning transformation, to ensure that burner hearth does not produce serious coking at reducing atmosphere lower hearth, has become the rigid guarantee requirement that each power plant proposes.
At present, " W " flame furnace pattern of domestic power plant is various, no matter be " W " flame furnace of any school, in actual motion, all reflect one by one the problem that boiler coke is serious, especially four jiaos of cokings of lower hearth are more outstanding, mainly concentrate on the position such as aileron and side wall, thickness of coke layer when slagging scorification is serious can reach 500mm, burnt layer is comparatively hard, has had a strong impact on the safe operation of boiler, causes power plant often to need blowing out to beat in 1 year for several times burnt.A lot of boilers also occurred because Jiao that collapses stops up cinder notch in running, caused dragveyer to stop transport, and had to carry out the situation of artificial treatment.
For alleviating coking situation, each power plant generally takes the method for operation of inactive burner hearth corner burner, and the coal that " W " flame furnace uses is often poor, and ash content is high, calorific value is lower, and low heat valve is substantially between 14000~18000KJ/Kg, and coal-fired consumption is large.Because burner operation quantity is few, exerting oneself not of single burner, cannot meet the needs of boiler heavy-duty service.
Now, each power plant has done many trials for the problem that solves the coking of " W " flame furnace, has carried out local flow improvement, substantially all concentrates on the serious position of the coking such as aileron and side wall, and these local flow improvement measures comprise:
1. adjust the tilt angled down of four burners of four jiaos of outermost of burner hearth;
2. on aileron, add wind, cut off band steel between the corresponding absolute altitude of aileron place water screen tube and arrange more little air port;
3. the F geomantic omen cold wall pipe that pulls open outermost burner increases F wind snout;
4. optimize side wall wall with refractory lining, refracto and lay shape and area;
5. inactive burner hearth corner burner.
Above-mentioned employing solves the various technical measures of coking, has plenty of single enforcement, has plenty of comprehensive enforcement, and after transformation, to preventing that burner hearth coking from having played certain effect, but whole structure is not clearly.
Factor and mechanism that various technical measures to existing solution coking and coking produce are analyzed, and draw the following conclusions:
1. the adjustment of burner tilt angled down, just makes breeze airflow away from front-back wall region, and the flue gas flow field in side wall and aileron region is improved not quite, fails to prevent that uncombusted pulverized coal particle is mobile along washing away of side wall wall.
2. increase the means in aileron wind and F air port, only just increase the wall oxygen content in this region, form oxidizing atmosphere, but because aileron air port is to utilize band steel between water screen tube to cut off to form, air port is little, deficiency in draught, long playing result can often be stopped up, and does not have due effect.
3. for " W " flame combustion mode, have for anthracite be difficult to catch fire, the steady feature of combustion and after-flame, lower hearth has often laid more wall with refractory lining, refracto, volume heat load is high compared with conventional pulverized-coal stove, ignition temperature level is higher, and flame kernel temperature reaches more than 1500 DEG C, can reach the effect of steady combustion, but for using the ature of coal that ash fusion point is lower, be prone to the phenomenon of coking.The optimization of wall with refractory lining, refracto has certain effect to reducing the ignition temperature of lower hearth, if but destroy too much wall with refractory lining, refracto, unfavorable to steady combustion again, cause coal dust to be difficult to the difficulty of after-flame, the unification that is difficult to take into account the stability of burning and effectively prevents coking.
If 4. take the method for operation of burner hearth corner burner of stopping using, be difficult to ensure the oepration at full load of boiler, the economy of boiler of power plant operation is affected, neither be reliably and with long-term, economic, the safe method of operation.
Utility model content
Analyze the reason that " W " furnace coking produces, current many power plant " W " stove F windshield plate in service aperture is that both sides are little, broad in the middle, its objective is the wind supply quantity that increases burner hearth middle part.From test report content: " preheater entrance oxygen amount distributes and presents the phenomenon of both sides large (5%~6%), middle part little (1%~2%) "; I.e. " economizer exit flue oxygen amount field is all that inner side oxygen amount is low, outside oxygen amount is high, lacks wind in the middle of this explanation combustion chamber ".These results suggest that, taked to make the measure of damper in different opening although power plant is in service in furnace chamber width, low in the middle of the oxygen amount distribution situation on furnace profile remains, both sides are high.It can be said that the serious main cause of open oven thorax both walls coking is not that near burner hearth both walls water-cooling wall, the oxygen concentration in flue gas is too low, but being pulverized coal flame, directly washes away due to both walls water-cooling wall aflame high-temperature flue gas, because burner hearth folding corner region does not have the obstruction of Secondary Air jet, will drive as after-flame pulverized coal particle is along side wall to aileron, simultaneously from aileron, side wall adherent flowing from bottom to top.
According to the digital simulation result of calculation of boiler of the same type, the main cause that pulverized coal flame washes away both walls is: burner hearth middle part flue-gas temperature is far above near flue-gas temperature both walls, and near both walls, the gap between coal burner and water-cooling wall forms flue gas corridor, cause flue gas also in furnace chamber width, to produce lateral flow in the process rising, from burner hearth middle part to two side flow due to.So the coking situation of both walls water-cooling wall there is no essence improvement after corner burner stoppage in transit, the position of corner burner is not the basic reason of both walls water-cooling wall coking.
Cause the flue-gas temperature at burner hearth middle part far above near the reason of flue-gas temperature both walls be the length-width ratio of burner hearth excessive due to, and lay a large amount of wall with refractory lining, refracto, whole lower hearth is equivalent to adiabatic furnace, make flue-gas temperature higher, so the coking phenomenon of " W " chimney corner portion both walls water-cooling wall is also much serious compared with Opposite Firing Boiler.Although stoppage in transit corner burner can alleviate the possible degradation degree to both walls water-cooling wall of corner burner pulverized coal flame, but because this method of operation can make near cigarette temperature cigarette Wen Genggao, the both walls in the middle part of burner hearth lower, thereby the lateral flow of strengthening flue gas, therefore this method of operation can't obviously be improved the Coking of both walls.
Therefore, the purpose of this utility model is: provide one to prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove, prevent four jiaos of serious cokings of " W " stove, by improving the flue gas flow field in this region, alleviate the degradation degree of high-temperature flue gas to side water wall, thereby play the effect that prevents this serious coking in region, can effectively to solve existing boiler coke serious, especially four jiaos of serious technical problems of coking of lower hearth.
The purpose of this utility model is to realize by following technical proposals: one prevents the anti-scorch wind system of four jiaos of serious cokings of " W " stove, comprise burner hearth, anti-scorch wind apparatus and anti-scorch airduct, described burner hearth is square, formed by water screen tube, burner hearth comprises stokehold wall, wall after stove, be positioned at the furnace side wall of both sides and connect the aileron of adjacent two furnace walls, on the water screen tube of aileron, arrange for anti-scorch airduct from the outer gap toward passing in burner hearth, anti-scorch airduct is arranged on aileron along the direction of parallel sides furnace wall, the incoming end of anti-scorch airduct is arranged in the total air channel of Secondary Air of four jiaos, burner hearth, outlet air end is arranged on aileron.
As optimal way, the anti-scorch wind in anti-scorch airduct is pasting wing furnace wall surface along the direction of parallel sides furnace wall and is being blown into, and in the flue gas corridor of both walls, is pasting wall diffusion, in the direction of flow of flue gas, flows.
As optimal way, the anti-scorch airduct from incoming end to outlet air end is provided with controllable register.
As optimal way, on the pipeline of anti-scorch airduct, be provided with anti-scorch wind apparatus.
As optimal way, be provided with burner in four jiaos, burner hearth.
As optimal way, pull open bend pipe at aileron water-cooling wall and form outlet air end.
Compared with prior art, the beneficial effects of the utility model: the utility model prevents the anti-scorch wind system of four jiaos of serious cokings of " W " stove, the oxygen amount of improving four jiaos of water-cooling wall walls of burner hearth by introducing anti-scorch wind distributes and flue gas flow field, alleviate the degradation degree of high-temperature flue gas to side water wall, play the effect that prevents this serious coking in region; And effectively reduce the generation of NOx in combustion process, accomplish the discharge of efficient burning, low NOx and prevent coking three's unification; Specifically, possess following advantage:
1. anti-coking effect is obvious;
2. anti-scorch wind air quantity is controlled, easy operating;
3. system is simple, and line size is little, wide adaptability;
4. equipment investment expense is few, and economy is high;
5. system equipment reliability is high, and operation maintenance is simple.
Brief description of the drawings
Fig. 1 is the structural representation that the utility model prevents the anti-scorch wind system of four jiaos of serious cokings of " W " stove;
Fig. 2 is the I place enlarged diagram of Fig. 1;
Fig. 3 is arrangement schematic diagram of the present utility model.
In figure, 1-burner hearth, the anti-scorch airduct of 2-, 3-burner, the anti-scorch wind of 4-, the total air channel of 5-Secondary Air, 6-controllable register, 7-bellows, 8-expansion joint, the anti-scorch wind apparatus of 9-, the anti-scorch wind snout of 10-, 11-water screen tube, 12-stokehold wall, wall after 13-stove, 14-furnace side wall, 15-aileron.
Detailed description of the invention
Below in conjunction with specific embodiment, the utility model is further described.
Disclosed all features in this description, or step in disclosed all methods or process, except the speciality and/or step of mutual repulsion, all can combine by any way, unless narration especially, all can be replaced by other equivalences or the alternative features with similar object,, unless narration especially, an embodiment in a series of equivalences of each feature or similar characteristics.
As shown in Figure 1, 2, 3, the utility model prevents that the anti-scorch wind system of four jiaos of serious cokings of " W " stove from comprising burner hearth 1, anti-scorch wind apparatus 9 and anti-scorch airduct 2, on anti-scorch airduct 2, arranges expansion joint 8, is provided with burner 3 in 1 four jiaos, burner hearth.Described burner hearth 1 is square, formed by water screen tube 11, burner hearth 1 comprises stokehold wall 12, wall 13 after stove, be positioned at the furnace side wall 14 of both sides and connect the aileron 15 of adjacent two furnace walls, on the front-back wall of burner hearth 1 and side wall metope, arrange bellows 7, anti-scorch airduct 2 passes bellows 7 from stove in burner hearth, anti-scorch airduct 2 front ends and anti-scorch wind apparatus 9 are arranged on aileron 15 along the direction of parallel furnace side wall 14, anti-scorch wind 4 in anti-scorch airduct 2 by anti-scorch wind apparatus 9 current-sharings after, pasting furnace side wall surface along the direction of parallel furnace side wall is blown into from anti-scorch wind snout 10, and in the flue gas corridor of both walls, pasting wall diffusion, and upwards flow along the direction of flow of flue gas.The incoming end of anti-scorch airduct is arranged in the total air channel 5 of Secondary Air of four jiaos, burner hearth, and anti-scorch wind snout 10 is arranged on aileron 15; Anti-scorch airduct from incoming end to anti-scorch wind apparatus 9 is provided with controllable register 6; This controllable register 6 adopts the mode of manual adjustments, by test regulating fender aperture.
Workflow of the present utility model:
On burner hearth four angle blade wall water-cooling walls, arrange anti-scorch wind, on every angle blade wall, arrange for anti-scorch airduct from the outer gap toward passing in burner hearth by the mode of pulling open water screen tube or bending water screen tube being set.This gap makes anti-scorch wind energy enter enough smoothly burner hearth; then pasting wing furnace wall surface along the direction of parallel sides furnace wall and be blown into, and in the flue gas corridor of both walls, pasting wall diffusion, upwards flowing along the direction of flow of flue gas; form air curtain, thereby protect whole side wall wall.This anti-scorch wind is High-speed DC wind, design wind rate~5%, and design wind speed~40m/s, has ensured that anti-scorch wind has enough rigidity and blows to burner hearth center.
After corner burner puts into operation, anti-scorch wind can improve the wall oxygen content in the easy coking of side wall region on the one hand, makes this region in oxidizing atmosphere, improves the ash fusion point of uncombusted pulverized coal particle; On the other hand, because anti-scorch wind is arranged on aileron, between burner and side wall on the limit of burner hearth, away from the burner certain distance on limit, can not have a negative impact to the burning of primary combustion zone, its can with the acting in conjunction of the anti-scorch partition wind of aileron, form air curtain in side wall region, the high-temperature flue gas that prevents combustion zone, burner hearth middle part carries uncombusted coal dust and washes away side water wall; On the one hand, anti-scorch general mood flow path direction is sent into burner hearth against the mobile direction of side wall high-temperature flue gas again, can prevent that high-temperature flue gas from carrying uncombusted coal dust and flowing along side wall to aileron, in the bonding coking of aileron place.
Application Example:
Taking certain 300MW of power plant " W " flame combustion boiler as example, due to lower hearth four angle blade walls and the coking of side wall region serious, the annual blowing out that is in operation of four boilers is beaten burnt number of times 8 times, has 2 cokings at middle part, and all the other sink and get lodged in slag notch after aileron, side wall coking.While being in operation input corner burner, can there is aileron and large Jiao of side wall region knot, when across large Jiao, often cause burner hearth malleation, the situation of boiler extinguishment.This boiler is in operation and fails to drop into corner burner, and the result causing is in the situation that using existing coal, and boiler on-load ability, is often with sub-load.
Through this flame combustion boiler is carried out to technical Analysis, draw the following conclusions:
Coking situation: coking position mainly concentrates on the approaching position of aileron, aileron and front-back wall, aileron and furnace hopper intersection, aileron and climbs Jiao to side wall, and the coking of whole aileron short transverse is serious.On arch, coking situation is better, shields without obviously coking.Due to aileron and side wall coking serious, cause across large Jiao, be stuck in lower hearth furnace hopper outlet and blocked, the blowing out burned of having to.
In stove, temperature is up to more than 1500 DEG C because coking seriously causes for boiler, and according to assessment test and daily NOx concentration statistics, under conventional coal, emission of NOx of boiler concentration is through the 1100~1300mg/m that is everlasting 3, accidentally there is 1500mg/ m 3the high value of discharge.
Power plant takes measures to carry out low nitrogen burning transformation to two boilers, and transformation target call, solving on the problem basis of dropping into aileron and side wall coking in service after corner burner, falls low NOx drainage, ensures safe and economical boiler operation.
The NOx of " W " stove discharges high and boiler temperature level is high, burner hearth coking is seriously closely related, needs to ensure to carry out not producing serious coking at reducing atmosphere lower hearth after low nitrogen burning transformation.Generate for accomplishing both effectively to reduce in combustion process NOx, can prevent that again four jiaos, burner hearth from producing serious coking, accomplish the discharge of efficient burning, low NOx and prevent coking three's unification.The oxygen amount that the anti-scorch wind that utilizes anti-scorch wind system to introduce in improvement project design improves four jiaos of water-cooling wall walls of burner hearth distributes and flue gas flow field, alleviates the degradation degree of high-temperature flue gas to side water wall, plays the effect that prevents this serious coking in region.
The design of anti-scorch wind system is mainly arranged anti-scorch wind on burner hearth four angle blade wall water-cooling walls, pulls open water screen tube and arrange two-layer anti-scorch wind snout, corresponding layout air distribution plate on every angle blade wall.Anti-scorch wind is pasting wing furnace wall surface along the direction of parallel sides furnace wall and is being blown into, and in the flue gas corridor of both walls, is pasting wall diffusion, in the direction of flow of flue gas, flows, and protects whole side wall wall.Anti-scorch wind is High-speed DC wind, design wind rate~5%, and design wind speed~40m/s, ensures that anti-scorch wind has enough rigidity and blows to burner hearth center.Anti-scorch wind is taken from four jiaos of total air channels of Secondary Air of burner hearth, connects by airduct, introduces hot Secondary Air to four jiaos of anti-scorch wind apparatus of burner hearth, and arranges that non-metal expansion joint absorbs the expansion between burner hearth and airduct, and layout manual adjustments baffle plate is convenient to regulate.
After adopting technology described in the utility model to transform; boiler low nitrogen burning adopts anti-scorch wind system, can form in side wall region air curtain, protection water-cooling wall; make wall-cooling surface oxygen content > 0.5%, play the effect that prevents four jiaos of serious cokings of burner hearth.In conjunction with all the other transformation means, ensure effectively to reduce NOx and generate simultaneously.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims (6)

1. one kind prevents the anti-scorch wind system of four jiaos of serious cokings of " W " stove, comprise burner hearth, described burner hearth is square, formed by water screen tube, burner hearth comprises stokehold wall, Lu Houqiang, is positioned at the furnace side wall of both sides and connects the aileron of adjacent two furnace walls, it is characterized in that: also comprise anti-scorch airduct, on the water screen tube of aileron, arrange for anti-scorch airduct from the outer gap toward passing in burner hearth, anti-scorch airduct is arranged on aileron along the direction of parallel sides furnace wall, the incoming end of anti-scorch airduct is arranged in the total air channel of Secondary Air of four jiaos, burner hearth, and outlet air end is arranged on aileron.
2. the anti-scorch wind system of four jiaos of serious cokings of as claimed in claim 1 preventing " W " stove, it is characterized in that: the anti-scorch wind in anti-scorch airduct is pasting wing furnace wall surface along the direction of parallel sides furnace wall and is being blown into, and in the flue gas corridor of both walls, pasting wall diffusion, in the direction of flow of flue gas, flow.
3. the anti-scorch wind system of four jiaos of serious cokings of as claimed in claim 1 preventing " W " stove, is characterized in that: the anti-scorch airduct from incoming end to outlet air end is provided with controllable register.
4. the anti-scorch wind system of four jiaos of serious cokings of as claimed in claim 1 preventing " W " stove, is characterized in that: on the pipeline of anti-scorch airduct, be provided with anti-scorch wind apparatus.
5. the anti-scorch wind system of four jiaos of serious cokings of as claimed in claim 1 preventing " W " stove, is characterized in that: be provided with burner in four jiaos, burner hearth.
6. the anti-scorch wind system of four jiaos of serious cokings of as claimed in claim 1 preventing " W " stove, is characterized in that: pull open bend pipe at aileron water-cooling wall and form outlet air end.
CN201420385753.4U 2014-07-14 2014-07-14 Prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove Active CN203980331U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105202533A (en) * 2015-10-28 2015-12-30 贵州电网有限责任公司电力科学研究院 Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction
CN105509086A (en) * 2015-12-02 2016-04-20 西安西热锅炉环保工程有限公司 Asymmetric high-speed closing-to-wall air system for preventing and controlling high-temperature corrosion of hearth of coal-fired boiler
CN107355811A (en) * 2016-06-02 2017-11-17 中国大唐集团科学技术研究院有限公司 Boiler combustion optimization method of adjustment
WO2021243588A1 (en) * 2020-05-30 2021-12-09 龙岩新东阳环保净化有限公司 Furnace-wall coking prevention apparatus for burning section and burnout section of garbage incinerator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105202533A (en) * 2015-10-28 2015-12-30 贵州电网有限责任公司电力科学研究院 Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction
CN105509086A (en) * 2015-12-02 2016-04-20 西安西热锅炉环保工程有限公司 Asymmetric high-speed closing-to-wall air system for preventing and controlling high-temperature corrosion of hearth of coal-fired boiler
CN105509086B (en) * 2015-12-02 2017-09-15 西安西热锅炉环保工程有限公司 The adherent wind system of asymmetric high speed prevented and treated for the high temperature corrosion of coal-burning boiler burner hearth
CN107355811A (en) * 2016-06-02 2017-11-17 中国大唐集团科学技术研究院有限公司 Boiler combustion optimization method of adjustment
CN107355811B (en) * 2016-06-02 2019-08-06 中国大唐集团科学技术研究院有限公司 Boiler combustion optimization method of adjustment
WO2021243588A1 (en) * 2020-05-30 2021-12-09 龙岩新东阳环保净化有限公司 Furnace-wall coking prevention apparatus for burning section and burnout section of garbage incinerator

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