CN103234199A - Swing type over-fire air device, over-fire air system and over-fire air control method - Google Patents
Swing type over-fire air device, over-fire air system and over-fire air control method Download PDFInfo
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Abstract
The invention discloses a swing type over-fire air device, an over-fire air system and an over-fire air control method. According to the swing type over-fire air device, two transverse partition plates are arranged in an over-fire air box and used for dividing the over-fire air box into upper, middle and lower over-fire air channels; a plurality of longitudinal baffles, which are oblique relative to the axial direction of each air channel, is arranged in a nozzle at the tail end of each of the upper and lower over-fire air channels; the jet direction formed by the longitudinal baffles at the tail end of the lower over-fire air channel is opposite to the rotating direction of main rotating airstream in a furnace; and the jet direction formed by the longitudinal baffles at the tail end of the upper over-fire air channel is the same as the rotating direction of the main rotating airstream in the furnace. The over-fire air device can accelerate mixing of over-fire air and coal coke, make full use of the height of a burnout zone and the retention time of the coal coke, improve the combustion efficiency, increase the burnout rate, reduce the negative effect of air staged combustion on the combustion efficiency and the content of carbon in fly ash, alleviate the effect of residual rotation of flue gas at the outlet of a furnace cavity, and relieve the problems of high-temperature corrosion and slag bonding in a water-cooled wall zone.
Description
Technical field
The present invention relates to a kind of swing type combustion exhausted wind apparatus for pulverized-coal fired boiler and after-flame wind system and after-flame wind control method.
Background technology
67% of China's nitrogen oxide emission all comes from fire coal, and the nitrogen oxide in the atmosphere is comprised NO, NO
2, N
2O, N
2O
3, N
2O
4, N
2O
5Deng, be usually collectively referred to as NO
X, NO
XIt is one of main source of atmosphere pollution.Occupy very big ratio at world wide because of the nitrogen oxide that the burning fossil fuel discharges every year in all discharged nitrous oxides.Along with the raising of environmental requirement, country is to NO
XThe control of discharge capacity is more and more stricter.NO
XControl technology mainly is divided into two classes, and the one, adopt low NO
XCombustion technology, the 2nd, adopt the afterbody denitration technology.Adopt the gas denitrifying technology initial stage to have high input, the operating cost height, and operating cost and initial stage drop into all and smoke inlet NO
XConcentration is relevant, thereby will adopt low NO before adopting gas denitrifying technology usually
XCombustion technology reduces furnace outlet NO
XConcentration.Present newly built and improved station boiler generally adopts low NO
XIntegrated air fractional combustion mode in the stove of the independent after-flame wind snout that install burner and burner hearth middle and upper part reduces tail flue gas purifier entrance NO significantly thereby reach
XThe purpose of concentration.
Adopt the NO of integrated air fractional combustion mode
XDischarge value is more much lower than the combustion system that this combustion exhausted wind apparatus is not set.Yet the air classification combustion technology tends to bring the negative issue that efficiency of combustion descends or the flying dust carbon containing increases, NO
XThe reduction degree of discharging is more big, and is often also more big to the efficiency of combustion influence.Because the after-flame air quantity accounts for the ratio of stove total blast volume about 20～40%, obviously after the partial combustion share of coal dust can be delayed to the after-flame risk investment and goes into, if after-flame wind is from putting into the time of staying in furnace outlet stage less than the tail-off time of this part combustion share, burn-off rate will obviously be affected.Generally speaking, under the same air classification condition, the boiler that capacity is more big, furnace volume heat release rate is littler, the negative effect that its efficiency of combustion is subjected to is just more little, and this is because the after-flame air port is more longer relatively to the time of staying of furnace outlet.But, when for concrete boiler, after the absolute altitude setting of after-flame wind and air classification degree are determined, flue gas and the after-flame wind mixability come on after-flame wind and the reducing zone become the direct key factor that influences the after-flame degree, if mix relatively poor, be equivalent to postpone the mixing of after-flame wind and coal tar, wasted burning-out zone height or the time of staying.The way it goes for actual conditions, because the wind speed got of after-flame selection by winnowing is generally than secondary wind height, after-flame wind snout group height is less, combustion exhausted wind apparatus adopts four jiaos of little circle of contacts of tangent to arrange, these factors cause the rigidity of after-flame wind jet strong, and jet is difficult for deflection, and namely the actual circle of contact of Xing Chenging is less.And from the primary zone with spiralling a large amount of coal tar particles under centrifugal action, can be thrown toward near the wall, formed after-flame wind in interior, a large amount of coal tar particles distribution outside, because flow spiral rises, the distribution such up to furnace outlet all changes than difficult.Therefore, send into the position at after-flame wind and can't realize guaranteeing that by existing after-flame wind set-up mode the wind powder fully mixes as early as possible, to the waste that the burning-out zone height causes, also fail to solve problems such as the high temperature corrosion in burner hearth afterbody residual rotation and water-cooling wall near wall zone and slagging scorification.
Summary of the invention
The objective of the invention is at the prior art above shortcomings, a kind of swing type combustion exhausted wind apparatus and after-flame wind system and after-flame wind control method are provided, it can accelerate the mixing of after-flame wind and coal tar, burning-out zone height and the coal tar time of staying have been taken full advantage of, improve efficiency of combustion and the burn-off rate of pulverized-coal fired boiler, alleviate because the negative effect that the integrated air fractional combustion brings efficiency of combustion and unburned carbon in flue dust in the stove, and reduce the effect of furnace outlet flue gas residual rotation and alleviate high temperature corrosion and the slagging scorification problem in water-cooling wall zone.
For achieving the above object, swing type combustion exhausted wind apparatus of the present invention, comprise the after-flame bellows, it is characterized in that in the after-flame bellows, being provided with two-layer horizontal dividing plate, the after-flame bellows are divided into three after-flame air channels, upper, middle and lower, in the terminal spout in upper and lower two after-flame air channels, be equipped with the air channel and axially be the several piece longitudinal baffle that is in tilted layout, following after-flame air channel end is opposite with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, and last after-flame air channel end is identical with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms; This combustion exhausted wind apparatus by three after-flame air channels, upper, middle and lower with after-flame wind be divided into that top after-flame yaw wind, middle part after-flame are directly dried, three strands of bottom after-flame blowback wind, and inject burner hearth from different angles;
As the further improvement of above-mentioned combustion exhausted wind apparatus, the several piece longitudinal baffle in upper and lower two after-flame air channels all is located in separately the air channel by rotating shaft, and upper and lower two groups of longitudinal baffles all link to each other with separately swing mechanism; Can realize that the injection direction of the terminal spout in upper and lower after-flame air channel swings in certain angle;
Above-mentioned swing mechanism can be for connecting support, preceding transition connecting rod, guide link, slide-and-guide cover, back transition connecting rod, crank, rotation fairlead, it is hinged with each longitudinal baffle on the same group to connect the support front end, the two ends of preceding transition connecting rod are hinged with the front end that is connected back-end support and guide link respectively, the two ends of back transition connecting rod are hinged with the front end of guide link rear end and crank respectively, guide link slides through the slide-and-guide cover that sets firmly, and the rear portion of crank is arranged in the rotation fairlead that sets firmly; Rear portion by rotating crank can drive the longitudinal baffle rotation, realizes the swing of spout injection direction;
Above-mentioned swing mechanism also can be for connecting support, transition connecting rod, being loaded on fork, crank, slip in the air channel by bearing pin and being placed in sliding sleeve on the fork, it is hinged with each longitudinal baffle on the same group to connect the support front end, the front end that connects back-end support and transition connecting rod is hinged, the rear end of transition connecting rod and fork front end are hinged, and sliding sleeve is articulated on the crank; Also can drive longitudinal baffle by rotating crank rotates;
As the further improvement of above-mentioned combustion exhausted wind apparatus, the cross-sectional flow area in three after-flame air channels, described upper, middle and lower is than being 1:3:1～1:1:1; Can realize the reasonable distribution of after-flame air quantity;
After-flame wind system of the present invention, comprise the bight of one deck at least combustion exhausted wind apparatus of being located at the burner hearth middle and upper part, every layer of bight combustion exhausted wind apparatus comprises four combustion exhausted wind apparatus being located at four jiaos in burner hearth, each combustion exhausted wind apparatus includes the after-flame bellows, it is characterized in that in each after-flame bellows, being equipped with two-layer horizontal dividing plate, the after-flame bellows are divided into three after-flame air channels, upper, middle and lower, in the terminal spout in upper and lower two after-flame air channels, are equipped with the air channel and axially are the several piece longitudinal baffle that is in tilted layout; Rotation direction with respect to main rotational gas flow in the stove, the axial forward in after-flame air channel, middle part points to burner hearth, following after-flame air channel end is opposite with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, last after-flame air channel end is identical with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, and after-flame air channel, middle part axially and the cornerwise angle of corner, place burner hearth less than last after-flame air channel injection direction and the cornerwise angle of burner hearth; Form the after-flame wind system that quadrangle tangential circle is arranged;
The present invention is applicable to that the after-flame wind control method of above-mentioned after-flame wind system is: after-flame wind is divided into one deck at least in the burner hearth middle and upper part, every layer of after-flame wind snout from four jiaos in burner hearth spurted into burner hearth, and at each spout place after-flame wind is divided into top after-flame yaw wind, the middle part after-flame is directly dried, three strands of bottom after-flame blowback wind, rotation direction with respect to main rotational gas flow in the stove, bottom after-flame blowback wind is oppositely injected burner hearth, the middle part after-flame is directly dried and the top equal forward of after-flame yaw wind is injected burner hearth, and the middle part after-flame is directly dried injection direction and the cornerwise angle of corner, place burner hearth less than top after-flame yaw wind injection direction and the cornerwise angle of burner hearth;
Above-mentioned combustion exhausted wind apparatus is divided into three after-flame air channels, upper, middle and lower, form respectively during use that top after-flame yaw wind, middle part after-flame are directly dried, bottom after-flame blowback wind, bottom after-flame air channel blowback wind is oppositely injected burner hearth, timely delivery of supplemental oxygen amount, enlarge after-flame wind in the influence area on jet plane, reach and strengthen coal tar fully mixes after-flame fast on after-flame wind jet plane purpose, also can play the effect that reduces the furnace outlet flue gas residual rotation, with this reduce that furnace outlet is crossed, steam side heat transfer deviation in the reheater; The middle part after-flame is directly dried and is injected the formation tangential firing of burner hearth central authorities, and middle part after-flame wind rigidity is big, and the jet penetration power is strong, replenishes for the burner hearth middle section in time promptly provides oxygen, makes the uncombusted coal dust at circle of contact zone-perturbation after-flame; After-flame air channel, top yaw wind is to the stirring perturbation action away from the pulverized coal particle of burner hearth middle section, the wind powder mixes near the strengthen water-cooled wall, and make water-cooling wall near wall zone form oxidizing atmosphere, alleviate water wall high temperature corrosion and slagging trend, be beneficial to the bellows chamber powder later stage after-flame state that forms burning-out zone, simultaneously water-cooling wall near wall zone uncombusted coal dust is swept along to middle primary zone, further improve burn-off rate; In a word, this method is divided into three strands with after-flame wind, thereby form the bellows chamber powder later stage after-flame state of burning-out zone, obviously expanded the influence area of after-flame wind, three after-flame air ports enter duty simultaneously, the common coordinative role of jet of three strands of different directions of same after-flame wind, after-flame wind degree of filling on its jet plane improves greatly, the wind powder fully mixes fast to be strengthened, the after-flame process of coal tar is not limited by replenishing of oxygen, saved burning-out zone height or the time of staying with this, improved the efficiency of combustion of pulverized-coal fired boiler under degree of depth classification condition, alleviated because the negative effect that the integrated air fractional combustion brings the stove internal procedure in the stove;
Further improvement as above-mentioned after-flame wind system, also be provided with one deck middle part combustion exhausted wind apparatus at least in the burner hearth middle and upper part, every layer of middle part combustion exhausted wind apparatus comprises four combustion exhausted wind apparatus being located at four sides furnace wall centerline, each combustion exhausted wind apparatus includes the after-flame bellows, in each after-flame bellows, be equipped with two-layer horizontal dividing plate, the after-flame bellows are divided into three after-flame air channels, upper, middle and lower, in the terminal spout in upper and lower two after-flame air channels, are equipped with the air channel and axially are the several piece longitudinal baffle that is in tilted layout; Rotation direction with respect to main rotational gas flow in the stove, the axial forward in after-flame air channel, middle part points to burner hearth, following after-flame air channel end is opposite with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, last after-flame air channel end is identical with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, and after-flame air channel, middle part axially with the angle of the interior vertical profile line of the place furnace wall angle less than vertical profile line in last after-flame air channel injection direction and the furnace wall;
Corresponding further improvement as after-flame wind control method of the present invention: a part of after-flame wind is also spurted into burner hearth by four after-flame wind snouts of furnace wall middle and upper part, four sides centerline, and also after-flame wind is divided into top after-flame yaw wind at each spout place, the middle part after-flame is directly dried, three strands of bottom after-flame blowback wind, rotation direction with respect to main rotational gas flow in the stove, bottom after-flame blowback wind is oppositely injected burner hearth, the middle part after-flame directly is dried and the top equal forward of after-flame yaw wind is injected burner hearth, and the middle part after-flame is directly dried the angle of injection direction and the interior vertical profile line of place furnace wall less than the angle of vertical profile line in top after-flame yaw wind injection direction and the furnace wall; By setting up the middle part combustion exhausted wind apparatus, can solve the problem that after-flame wind jet stroke on four jiaos of the jumbo pulverized-coal fired boilers can not effectively arrive at the jet zone of influence, bight, downstream, guarantee the high jet degree of filling of burning-out zone;
Further improvement as after-flame wind control method of the present invention: top after-flame yaw wind and bottom after-flame blowback wind equal shuttle-type spurting in the burner hearth in horizontal plane; Top after-flame yaw wind, middle part after-flame are directly dried, the air flow rate proportioning of bottom after-flame blowback wind is 1:3:1～1:1:1; Can realize the reasonable distribution of after-flame air quantity, improve the rigidity that the middle part after-flame is directly dried;
In sum, the present invention can accelerate the mixing of after-flame wind and coal tar, burning-out zone height and the coal tar time of staying have been taken full advantage of, improve efficiency of combustion and the burn-off rate of pulverized-coal fired boiler, alleviate because the negative effect that the integrated air fractional combustion brings efficiency of combustion and unburned carbon in flue dust in the stove, and reduce the effect of furnace outlet flue gas residual rotation and alleviate high temperature corrosion and the slagging scorification problem in water-cooling wall zone.
Description of drawings
Fig. 1 is the structural representation of after-flame wind system embodiment one of the present invention.
Fig. 2 is the partial cutaway stereogram of combustion exhausted wind apparatus among Fig. 1.
Fig. 3 is the cutaway view of swing mechanism among Fig. 2.
Fig. 4 is the distribution schematic diagram of after-flame wind on after-flame wind system embodiment one horizontal direction of the present invention.
Fig. 5 is the structural representation of after-flame wind system embodiment two of the present invention.
Fig. 6 is the cutaway view of combustion exhausted wind apparatus swing mechanism among Fig. 5.
Fig. 7 is the distribution schematic diagram of after-flame wind on after-flame wind system embodiment two horizontal directions of the present invention.
The specific embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
Embodiment one
As shown in Figures 1 to 4, this after-flame wind system, comprise five layers of bight combustion exhausted wind apparatus being located at burner hearth 1 middle and upper part, every layer of bight combustion exhausted wind apparatus includes four combustion exhausted wind apparatus 2 being located at four jiaos in burner hearth, each combustion exhausted wind apparatus 2 includes after-flame bellows 3, in each after-flame bellows 3, be equipped with two-layer horizontal dividing plate 4, the after-flame bellows are divided into, in, following three after- flame air channels 5,6,7, on described, in, following three after- flame air channels 5,6,7 cross-sectional flow area is than being 1:1:1, in the terminal spout in last after-flame air channel 5, be equipped with the air channel and axially be the several piece longitudinal baffle 8 that is in tilted layout, in the terminal spout in following after-flame air channel 7, be equipped with the air channel and axially be the several piece longitudinal baffle 9 that is in tilted layout, longitudinal baffle 8,9 all are located in separately the air channel 5 or 7 by the rotating shaft 10 at two ends, several piece longitudinal baffle 8 or 9 on the same group is parallel to each other and spaced set and link to each other with swing mechanism, swing mechanism comprises connection support 11, preceding transition connecting rod 12, guide link 13, the slide-and-guide that connects firmly with the fixed support 18 that is coupled on the after-flame bellows 3 overlaps 14, back transition connecting rod 15, crank 16, rotate fairlead 17, it is hinged with each longitudinal baffle 8 or 9 on the same group to connect support 11 front ends, the two ends of preceding transition connecting rod 12 are hinged with the front end that is connected support 11 rear ends and guide link 13 respectively, the two ends of back transition connecting rod 15 are hinged with the front end of guide link 13 rear ends and crank 16 respectively, the slide-and-guide that passes that guide link 13 is slided overlaps 14, and the rear portion of crank 16 is arranged in the rotation fairlead 17 that sets firmly; Rotation direction with respect to main rotational gas flow in the stove, the axial forward in after-flame air channel, middle part 6 points to burner hearth, namely axial and corner, the place burner hearth diagonal in after-flame air channel, middle part 6 arranges in a certain angle, following after-flame air channel 7 ends are opposite with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle 9 forms, last after-flame air channel 5 ends are identical with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle 8 forms, and after-flame air channel, middle part axially and the cornerwise angle of corner, place burner hearth less than last after-flame air channel injection direction and the cornerwise angle of burner hearth; Form the after-flame wind system that five layers of quadrangle tangential circle are arranged;
The after-flame wind control method that is applicable to above-mentioned after-flame wind system is: after-flame wind is divided into five layers in burner hearth 1 middle and upper part, every layer of combustion exhausted wind apparatus 2 from four jiaos in burner hearth injected burner hearth, and on each after-flame bellows 3 spout place passes through after-flame wind, in, following three after- flame air channels 5,6,7 are divided into top after-flame yaw wind 22, the middle part after-flame directly dries 21,20 3 strands of bottom after-flame blowback wind, rotation direction with respect to main rotational gas flow in the stove, bottom after-flame blowback wind 20 is oppositely injected burner hearth to be 5 °～25 ° angle with corner, place burner hearth diagonal, top after-flame yaw wind 22 is injected burner hearth to be 20 °～35 ° angle forward with corner, place burner hearth diagonal, the middle part after-flame directly dry 21 also forward inject burner hearth, the middle part after-flame is directly dried 21 injection directions and the cornerwise angle of corner, place burner hearth less than top after-flame yaw wind 22 injection directions and the cornerwise angle of burner hearth, and namely the injection direction of top after-flame yaw wind 22 more is partial to the water-cooling wall of furnace wall;
Each combustion exhausted wind apparatus 2 forms top after-flame yaw wind 22 respectively, the middle part after-flame directly blows 21 wind, bottom after-flame blowback wind 20, bottom after-flame air channel blowback wind 20 is oppositely injected burner hearth, timely delivery of supplemental oxygen amount, enlarge after-flame wind in the influence area on jet plane, reach and strengthen coal tar fully mixes after-flame fast on after-flame wind jet plane purpose, also can play the effect that reduces the furnace outlet flue gas residual rotation, with this reduce that furnace outlet is crossed, steam side heat transfer deviation in the reheater; The middle part after-flame directly dry and 21 is injected burner hearth central authorities formation tangential firing, and middle part after-flame wind rigidity is big, and the jet penetration power is strong, for the burner hearth middle section in time promptly provides oxygen additional, makes the uncombusted coal dust at circle of contact zone-perturbation after-flame; 22 pairs of stirring perturbation actions away from the pulverized coal particle of burner hearth middle section of top after-flame yaw wind, the wind powder mixes near the strengthen water-cooled wall, and make water-cooling wall near wall zone form oxidizing atmosphere, alleviate water wall high temperature corrosion and slagging trend, be beneficial to the bellows chamber powder later stage after-flame state that forms burning-out zone, simultaneously water-cooling wall near wall zone uncombusted coal dust is swept along to middle primary zone, further improve burn-off rate; In a word, this method is divided into three strands with after-flame wind, thereby form the bellows chamber powder later stage after-flame state of burning-out zone, obviously expanded the influence area of after-flame wind, three after-flame air ports enter duty simultaneously, the common coordinative role of jet of three strands of different directions of same after-flame wind, after-flame wind degree of filling on its jet plane improves greatly, the wind powder fully mixes fast to be strengthened, the after-flame process of coal tar is not limited by replenishing of oxygen, taken full advantage of burning-out zone height and the coking coal time of staying with this, improved the efficiency of combustion of pulverized-coal fired boiler under degree of depth classification condition, alleviated because the negative effect that the integrated air fractional combustion brings the stove internal procedure in the stove; According to operating mode, the rear portion by rotating crank 16 can drive corresponding longitudinal baffle 8 or 9 and rotate, and can make the spray angle of top after-flame yaw wind 22 and bottom after-flame blowback wind 20 swing within the specific limits;
Embodiment two
Extremely shown in Figure 7 as Fig. 5, this embodiment compares with embodiment one, its after-flame wind system includes four combustion exhausted wind apparatus 25 being located at four jiaos in burner hearth except comprising five layers of bight combustion exhausted wind apparatus being located at burner hearth 1 middle and upper part, every layer of bight combustion exhausted wind apparatus, comprise also and the second layer and the 4th grate firing contour two-layer middle part combustion exhausted wind apparatus of wind apparatus 2 to the greatest extent that every layer of middle part combustion exhausted wind apparatus comprises four combustion exhausted wind apparatus 26 being located at four sides furnace wall centerline; Four jiaos combustion exhausted wind apparatus 25 is all identical with the combustion exhausted wind apparatus at middle part 26 its structures, they are compared with the combustion exhausted wind apparatus 2 among the embodiment one, its difference only is: the swing mechanisms that link to each other with longitudinal baffle 8 or 9 change into and are connected support 27, transition connecting rod 31, be loaded on fork 28 in the air channel by bearing pin, crank 29, slip is placed in the sliding sleeve 30 on the fork 28, it is hinged with each longitudinal baffle 8 or 9 on the same group to connect support 27 front ends, it is hinged to connect support 27 rear ends and transition connecting rod 31 front ends, transition connecting rod 31 rear ends and fork 28 front ends are hinged, sliding sleeve 30 is articulated on the crank 29, two combustion exhausted wind apparatus 25, other structure of 26 is all identical with embodiment one; Also can drive longitudinal baffle 8 or 9 by rotating crank 29 rotates;
This after-flame wind system also passes through a part of after-flame wind on the centerline of furnace wall middle and upper part, four sides, following four combustion exhausted wind apparatus 26 are spurted into burner hearth, and also after-flame wind is divided into top after-flame yaw wind 32 at each spout place, the middle part after-flame directly dries 33,34 3 strands of bottom after-flame blowback wind, rotation direction with respect to main rotational gas flow in the stove, bottom after-flame blowback wind 34 is oppositely injected burner hearth, the middle part after-flame directly dry 33 and top after-flame yaw wind 32 equal forwards inject burner hearth, and the middle part after-flame is directly dried the angle of the interior vertical profile line of 33 injection directions and place furnace wall less than the angle of vertical profile line in top after-flame yaw wind 32 injection directions and the furnace wall; By setting up middle part combustion exhausted wind apparatus 26, can solve the problem that after-flame wind jet stroke on four jiaos of the jumbo pulverized-coal fired boilers can not effectively arrive at the jet zone of influence, bight, downstream, guarantee the high jet degree of filling of burning-out zone;
The invention is not restricted to above-mentioned embodiment, the number of plies as bight combustion exhausted wind apparatus and middle part combustion exhausted wind apparatus and arrangement mode also can be varied, the cross-sectional flow area in three after-flame air channels, upper, middle and lower of each combustion exhausted wind apparatus can change 1:3:1 into than also, to improve the rigidity that the middle part after-flame is directly dried; As long as adopt claim 1 or 6 or 8 described technical schemes, all fall into protection scope of the present invention.
Claims (10)
1. swing type combustion exhausted wind apparatus, comprise the after-flame bellows, it is characterized in that in the after-flame bellows, being provided with two-layer horizontal dividing plate, the after-flame bellows are divided into three after-flame air channels, upper, middle and lower, in the terminal spout in upper and lower two after-flame air channels, be equipped with the air channel and axially be the several piece longitudinal baffle that is in tilted layout, following after-flame air channel end is opposite with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, and last after-flame air channel end is identical with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms.
2. swing type combustion exhausted wind apparatus as claimed in claim 1, the several piece longitudinal baffle that it is characterized in that upper and lower two after-flame air channels all are located in separately the air channel by rotating shaft, and upper and lower two groups of longitudinal baffles all link to each other with separately swing mechanism.
3. swing type combustion exhausted wind apparatus as claimed in claim 2, it is characterized in that described swing mechanism comprises connection support, preceding transition connecting rod, guide link, slide-and-guide cover, back transition connecting rod, crank, rotation fairlead, it is hinged with each longitudinal baffle on the same group to connect the support front end, the two ends of preceding transition connecting rod are hinged with the front end that is connected back-end support and guide link respectively, the two ends of back transition connecting rod are hinged with the front end of guide link rear end and crank respectively, guide link slides through the slide-and-guide cover that sets firmly, and the rear portion of crank is arranged in the rotation fairlead that sets firmly.
4. swing type combustion exhausted wind apparatus as claimed in claim 2, it is characterized in that described swing mechanism comprises connects support, transition connecting rod, is loaded on fork, crank, slip in the air channel by bearing pin and is placed in sliding sleeve on the fork, it is hinged with each longitudinal baffle on the same group to connect the support front end, the front end that connects back-end support and transition connecting rod is hinged, the rear end of transition connecting rod and fork front end are hinged, and sliding sleeve is articulated on the crank.
5. as the arbitrary described swing type combustion exhausted wind apparatus of claim 1 to 4, it is characterized in that the cross-sectional flow area in three after-flame air channels, described upper, middle and lower is than being 1:3:1～1:1:1.
6. after-flame wind system, comprise the bight of one deck at least combustion exhausted wind apparatus of being located at the burner hearth middle and upper part, every layer of bight combustion exhausted wind apparatus comprises four combustion exhausted wind apparatus being located at four jiaos in burner hearth, each combustion exhausted wind apparatus includes the after-flame bellows, it is characterized in that in each after-flame bellows, being equipped with two-layer horizontal dividing plate, the after-flame bellows are divided into three after-flame air channels, upper, middle and lower, in the terminal spout in upper and lower two after-flame air channels, are equipped with the air channel and axially are the several piece longitudinal baffle that is in tilted layout; Rotation direction with respect to main rotational gas flow in the stove, the axial forward in after-flame air channel, middle part points to burner hearth, following after-flame air channel end is opposite with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, last after-flame air channel end is identical with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, and after-flame air channel, middle part axially and the cornerwise angle of corner, place burner hearth less than last after-flame air channel injection direction and the cornerwise angle of burner hearth.
7. after-flame wind system as claimed in claim 6, it is characterized in that also being provided with in the burner hearth middle and upper part one deck middle part combustion exhausted wind apparatus at least, every layer of middle part combustion exhausted wind apparatus comprises four combustion exhausted wind apparatus being located at four sides furnace wall centerline, combustion exhausted wind apparatus includes the after-flame bellows, in each after-flame bellows, be equipped with two-layer horizontal dividing plate, the after-flame bellows are divided into three after-flame air channels, upper, middle and lower, in the terminal spout in upper and lower two after-flame air channels, are equipped with the air channel and axially are the several piece longitudinal baffle that is in tilted layout; Rotation direction with respect to main rotational gas flow in the stove, the axial forward in after-flame air channel, middle part points to burner hearth, following after-flame air channel end is opposite with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, last after-flame air channel end is identical with the rotation direction of main rotational gas flow in the stove by the injection direction that its longitudinal baffle forms, and after-flame air channel, middle part axially with the angle of the interior vertical profile line of the place furnace wall angle less than vertical profile line in last after-flame air channel injection direction and the furnace wall.
8. after-flame wind control method that is used for the described after-flame wind system of claim 6, it is characterized in that: after-flame wind is divided into one deck at least in the burner hearth middle and upper part, every layer of after-flame wind snout from four jiaos in burner hearth spurted into burner hearth, and at each spout place after-flame wind is divided into top after-flame yaw wind, the middle part after-flame is directly dried, three strands of bottom after-flame blowback wind, rotation direction with respect to main rotational gas flow in the stove, bottom after-flame blowback wind is oppositely injected burner hearth, the middle part after-flame is directly dried and the top equal forward of after-flame yaw wind is injected burner hearth, and the middle part after-flame is directly dried injection direction and the cornerwise angle of corner, place burner hearth less than top after-flame yaw wind injection direction and the cornerwise angle of burner hearth.
9. after-flame wind control method as claimed in claim 8, it is characterized in that: a part of after-flame wind is also spurted into burner hearth by four after-flame wind snouts of furnace wall middle and upper part, four sides centerline, and also after-flame wind is divided into top after-flame yaw wind at each spout place, the middle part after-flame is directly dried, three strands of bottom after-flame blowback wind, rotation direction with respect to main rotational gas flow in the stove, bottom after-flame blowback wind is oppositely injected burner hearth, the middle part after-flame directly is dried and the top equal forward of after-flame yaw wind is injected burner hearth, and the middle part after-flame is directly dried the angle of injection direction and the interior vertical profile line of place furnace wall less than the angle of vertical profile line in top after-flame yaw wind injection direction and the furnace wall.
10. after-flame wind control method as claimed in claim 9 is characterized in that: top after-flame yaw wind and bottom after-flame blowback wind equal shuttle-type spurting in the burner hearth in horizontal plane; Top after-flame yaw wind, middle part after-flame are directly dried, the air flow rate proportioning of bottom after-flame blowback wind is 1:3:1～1:1:1.
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| CN114183746A (en) * | 2021-10-27 | 2022-03-15 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Over-fire air nozzle structure |
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