CN205782875U - A kind of secondary wind air-distribution device for CFBB - Google Patents
A kind of secondary wind air-distribution device for CFBB Download PDFInfo
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- CN205782875U CN205782875U CN201620495049.3U CN201620495049U CN205782875U CN 205782875 U CN205782875 U CN 205782875U CN 201620495049 U CN201620495049 U CN 201620495049U CN 205782875 U CN205782875 U CN 205782875U
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- secondary wind
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- standpipe
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Abstract
The utility model discloses a kind of secondary wind air-distribution device for CFBB, including boiler, it is located at offering on four sides wall in boiler and allows the water-cooling wall of pipe and secondary air system, lower portion thereof is emulsion zone, top is dilute-phase zone, secondary air system includes secondary wind arm, it is placed in boiler front wall, many secondary wind standpipes outside rear wall and be arranged on water-cooling wall the overfire air port being connected with secondary wind standpipe, overfire air port includes double spout and single jet, overfire air port layered arrangement is in boiler dilute-phase zone, diplopore allows pipe and single hole allow pipe to allow pipe include, secondary wind arrangement of the present utility model adds the perturbation action of flue gas in burner hearth, make full combustion of fuel, reduce NOxGeneration, not only achieve the classification of secondary wind short transverse, realize horizontal direction classification simultaneously.
Description
Technical field
This utility model belongs to technical field of boiler combustion, particularly to a kind of secondary wind air-distribution device for CFBB.
Background technology
In the nitrogen oxides produced in boiler combustion process, NO occupies more than 90%, nitrogen dioxide accounts for 5%-10%, mechanism of production is generally divided into following three kinds: (1) heating power type: during burning, and in air, nitrogen at high temperature aoxidizes generation, along with the rising of reaction temperature T, its reaction rate is exponentially, when T<1500 DEG C, the growing amount of NO is little, and as T>1500 DEG C time, T often increases by 100 DEG C, and reaction rate increases 6-7 times；(2) transient response type: the CH free radical that in fuel volatile matter, Hydrocarbon pyrolytic generates can generate HCN and N with nitrogen reaction in air, further generate at a terrific speed with oxygen effect, its formation time has only to 60ms, generated is directly proportional to furnace pressure 0.5 power, little with the relation of temperature.Above two nitrogen oxides does not the most account for NOxMajor part, be not main source.(3) fuel type NOx: being aoxidized in burning by nitrogen compound in fuel and form, owing in fuel, the heat decomposition temperature of nitrogen, less than coal dust firing temperature, will generate fuel type when 600-800 DEG C, it is at coal dust firing NOxAccounting for 60-80% in product, owing to burning of coal process was made up of fugitive constituent burning and coke two stages of burning, therefore the formation of fuel type is also made up of oxidation (coke) two parts of residual nitrogen in the oxidation (fugitive constituent) of gas phase nitrogen and coke.
In order to reduce NOxDischarge, need use low-NO_x combustion technology to reduce NOxGeneration chance, regulation boiler combustion characteristics.Existing circulating fluid bed boiler secondary air generally divides two stage arrangement, and horizontal direction cannot realize classification, although the boiler requirement to secondary air flow can be met, but secondary wind is poor to the perturbation action of flue gas in burner hearth, it is unfavorable for the fuel abundant burning in burner hearth.
Summary of the invention
The deficiency existed for prior art, technical problem to be solved in the utility model is to provide a kind of secondary wind air-distribution device for CFBB.
For solving above-mentioned technical problem, technical solution adopted in the utility model is: a kind of secondary wind air-distribution device for CFBB, including boiler, it is located at offering on four sides wall in boiler and allows the water-cooling wall of pipe and secondary air system, lower portion thereof is emulsion zone, top is dilute-phase zone, described secondary air system includes secondary wind arm, it is placed in boiler front wall, many secondary wind standpipes outside rear wall and be arranged on water-cooling wall the overfire air port being connected with secondary wind standpipe, overfire air port includes double spout and single jet, overfire air port layered arrangement is in boiler dilute-phase zone, described secondary wind is the mixture of air and circulating flue gas, described allow pipe include diplopore allows pipe and single hole allow pipe.
Further, between described secondary wind arm and secondary wind standpipe, secondary wind header is set, it is ensured that the secondary wind sprayed in boiler from each overfire air port is heated evenly, reduces thermal deviation.
Further, described boiler front wall both sides respectively set one and connect the one-jet standpipe of front wall, centre sets two standpipes connecting the double spout of front wall, the caliber of middle two standpipes is 2-3 times of the two standpipe calibers in both sides, and two spout centre positions of described front wall single jet spout double with front wall are positioned on same level line.
Further, after described boiler, wall sets five secondary wind standpipes, two, both sides secondary wind standpipe is connected double spout with a middle secondary wind standpipe, remaining two secondary wind standpipe connects single jet, the spacing of two spouts of middle double spout is more than the double spout in both sides, the caliber of the standpipe connecting double spout is connect one-jet standpipe caliber 2-3 times, described single jet is positioned on same level line with the upper spout of double spouts, and the centre position of double two spouts of spout of lower spout and centre of the double spout in described both sides is positioned on same level line.
Further, described front wall single jet allows pipe that secondary wind sprays into boiler by the single hole on boiler front water wall, and the double spout of described front wall allows pipe that secondary wind is sprayed into boiler by the diplopore on boiler front water wall.
Further, the single jet on described rear wall allows pipe that secondary wind sprays into boiler by the single hole on boiler rear water wall, and double spouts allow pipe that secondary wind is sprayed into boiler by the diplopore on boiler rear water wall.
Further, not less than 1.5m bottom overfire air port distance water-cooling wall.
Further, secondary wind riser length is 6-8 times of its caliber.
Compared with prior art, this utility model advantage is:
(1) conventional recycle fluidized-bed combustion boiler secondary air channel is evenly arranged in boiler, although this kind of arrangement form can meet the boiler requirement to secondary air flow, but secondary wind is poor to the perturbation action of flue gas in burner hearth, it is unfavorable for the fuel abundant burning in burner hearth, also it is unfavorable for the fractional combustion of burner hearth fuel and is layered to wind, this utility model is by arranging double spout and single jet, the caliber of adjustment overfire air port standpipe, not only achieve the classification of secondary wind short transverse, realize horizontal direction classification, to reach the target of burner hearth oxygen amount distributed uniform simultaneously；
(2) in secondary wind arrangement of the present utility model adds burner hearth, the perturbation action of flue gas, makes full combustion of fuel, reduces NOxGeneration；
(3) by improving the position of overfire air port, not less than 1.5m bottom distance water-cooling wall, increase Mi Xiang reducing zone, bottom height, thus increase the recovery time, allow the NO that more coal initiation combustion producesxIt is reduced to N2；
(4) secondary wind riser length is 6-8 times of its caliber, it is ensured that secondary wind can form good jet jeting effect in entering stove, keeps basic range not spread；
(5) by part circulating flue gas is mixed in secondary wind, be conducive to increasing the wind speed of overfire air port, strengthening dilute-phase zone gas-solid, the mixing of gas gas, improve burner hearth and the flow velocity in heat convection district, it is to avoid form district of localized hyperthermia, thus reduce NOxGenerate, extend the flying dust time of staying in stove simultaneously, beneficially fly ash refiring, reduces phosphorus content.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present utility model；
Fig. 2 is the layout schematic diagram of burner hearth inner second air spout of the present utility model；
Fig. 3 is that front water wall of the present utility model allows the pipe location drawing；
Fig. 4 is that rear water wall of the present utility model allows the pipe location drawing.
Detailed description of the invention
Below in conjunction with the accompanying drawings and this utility model is described in further details by specific embodiment.
A kind of secondary wind air-distribution device for CFBB, including boiler 1, it is located at offering on four sides wall in boiler 1 and allows the water-cooling wall of pipe and secondary air system, boiler 1 bottom be emulsion zone, top be dilute-phase zone, secondary air system includes secondary wind arm 3, be placed in boiler front wall 8, boiler after many secondary wind standpipes 3 outside wall 11 and be arranged on water-cooling wall the overfire air port 2 being connected with secondary wind standpipe 3, overfire air port 2 includes double spout and single jet, overfire air port 2 layered arrangement is in boiler 1 dilute-phase zone, and diplopore allows pipe and single hole allow pipe to allow pipe include.
Between described secondary wind arm 5 and secondary wind standpipe 3, secondary wind header 4 is set, it is ensured that the secondary wind sprayed in boiler 1 from each overfire air port 2 is heated evenly, reduces thermal deviation.
Described boiler front wall 8 both sides respectively set a standpipe connecting front wall single jet 9, centre sets two standpipes connecting the double spout 10 of front wall, the caliber of middle two standpipes is 2-3 times of the two standpipe calibers in both sides, to reach the classification of secondary wind horizontal direction, two spout centre positions of front wall single jet 9 spout 10 double with front wall are positioned on same level line, to reach the classification of secondary wind short transverse, described front wall single jet 9 allows pipe 16 that secondary wind sprays into boiler 1 by the front wall single hole on boiler front water wall 15, the double spout 10 of front wall allows pipe 17 that secondary wind sprays into boiler 1 by the front wall diplopore on boiler front water wall 15.
nullAfter described boiler, wall 11 sets five secondary wind standpipes，Two, both sides secondary wind standpipe connects the double spout 14 in Hou Qiang both sides，Double spouts 12 in the middle of wall after middle secondary wind standpipe connection，Wall single jet 13 after remaining two secondary wind standpipes connection，In the middle of rear wall, the spacing of two spouts of double spouts 12 is more than two spouts of the double spout 14 in Hou Qiang both sides，Connect the caliber of the standpipe of double spouts 12 in the middle of the double spouts 14 in Hou Qiang both sides and rear wall be connect after 2-3 times of standpipe caliber of wall single jet 13，To reach the classification of secondary wind horizontal direction，Described rear wall single jet 13、In the middle of the upper spout of the double spout 14 in Hou Qiang both sides and rear wall, the upper spout of double spouts 12 is positioned on same level line，In the middle of the lower spout of the double spout 14 in Hou Qiang both sides and rear wall, the centre position of double 12 two spouts of spout is positioned on same level line，To reach the classification of secondary wind short transverse，Described rear wall single jet 13 allows pipe 20 that secondary wind sprays into boiler 1 by the rear wall single hole on boiler rear water wall 18，The double spout 14 in Hou Qiang both sides allows pipe 21 that secondary wind is sprayed into boiler by the Hou Qiang both sides diplopore on boiler rear water wall 18，In the middle of rear wall, double spouts 12 allow pipe 19 that secondary wind is sprayed into boiler by diplopore in the middle of the rear wall on boiler rear water wall 18.
The double spout 10 of front wall bottom front water wall 15 not less than in the middle of 1.5m, rear wall double spouts 12 bottom rear water wall 18 not less than 1.5m, increase Mi Xiang reducing zone, bottom height, thus increase the recovery time, allow the NO that more coal initiation combustion producesxIt is reduced to N2。
Secondary wind riser length is 6-8 times of its caliber, to guarantee to form the jet jeting effect in good secondary wind entrance stove, keeps basic range not spread.
Secondary wind is the mixture of air and circulating flue gas, 7 partial fumes of circulating fan cause secondary wind arm 5 by circulation line 6 and mix with air, be conducive to increasing the wind speed of overfire air port, strengthening dilute-phase zone gas-solid, the mixing of gas gas, improve burner hearth and the flow velocity in heat convection district, avoid the formation of district of localized hyperthermia, thus reduce NOxGenerate, extend the flying dust time of staying in stove, beneficially fly ash refiring simultaneously.
In sum, secondary wind arrangement of the present utility model adds the perturbation action of flue gas in burner hearth, makes full combustion of fuel, reduces NOxGeneration；By arranging double spout and single jet, the caliber of adjustment overfire air port standpipe, not only achieve the classification of secondary wind short transverse, realize horizontal direction classification simultaneously, to reach the target of burner hearth oxygen amount distributed uniform；Increase Mi Xiang reducing zone, bottom height, thus increase the recovery time, allow the NO that more coal initiation combustion producesxIt is reduced to N2；By part circulating flue gas is mixed in secondary wind, is conducive to increasing the wind speed of overfire air port, strengthening dilute-phase zone gas-solid, the mixing of gas gas, improves burner hearth and the flow velocity in heat convection district, it is to avoid form district of localized hyperthermia, thus reduce NOxGenerate, extend the flying dust time of staying in stove simultaneously, beneficially fly ash refiring, reduces phosphorus content.
Certainly, described above is not to restriction of the present utility model, and this utility model is also not limited to the example above; those skilled in the art; in essential scope of the present utility model, the change made, retrofit, add or replace, all should belong to protection domain of the present utility model.
Claims (6)
1. the secondary wind air-distribution device for CFBB, including boiler, it is located at offering on four sides wall in boiler and allows the water-cooling wall of pipe and secondary air system, lower portion thereof is emulsion zone, top is dilute-phase zone, it is characterized in that: described secondary air system includes secondary wind arm, it is placed in boiler front wall, many secondary wind standpipes outside rear wall and be arranged on water-cooling wall the overfire air port being connected with secondary wind standpipe, overfire air port includes double spout and single jet, overfire air port layered arrangement is in boiler dilute-phase zone, described allow pipe include diplopore allows pipe and single hole allow pipe.
A kind of secondary wind air-distribution device for CFBB the most according to claim 1, it is characterised in that: between described secondary wind arm and secondary wind standpipe, secondary wind header is set.
A kind of secondary wind air-distribution device for CFBB the most according to claim 1, it is characterized in that: described boiler front wall both sides respectively set one and connect the one-jet standpipe of front wall, centre sets two standpipes connecting the double spout of front wall, the caliber of middle two standpipes is 2-3 times of the two standpipe calibers in both sides, and two spout centre positions of described front wall single jet spout double with front wall are positioned on same level line.
A kind of secondary wind air-distribution device for CFBB the most according to claim 1, it is characterized in that: after described boiler, wall sets five secondary wind standpipes, two, both sides secondary wind standpipe is connected double spout with a middle secondary wind standpipe, remaining two secondary wind standpipe connects single jet, the spacing of two spouts of middle double spout is more than the double spout in both sides, the caliber of the standpipe connecting double spout is connect one-jet standpipe caliber 2-3 times, described single jet is positioned on same level line with the upper spout of double spouts, the centre position of double two spouts of spout of lower spout and centre of the double spout in described both sides is positioned on same level line.
A kind of secondary wind air-distribution device for CFBB the most according to claim 1, it is characterised in that: not less than 1.5m bottom described overfire air port distance water-cooling wall.
A kind of secondary wind air-distribution device for CFBB the most according to claim 1, it is characterised in that: described secondary wind riser length is 6-8 times of its caliber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620495049.3U CN205782875U (en) | 2016-05-27 | 2016-05-27 | A kind of secondary wind air-distribution device for CFBB |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620495049.3U CN205782875U (en) | 2016-05-27 | 2016-05-27 | A kind of secondary wind air-distribution device for CFBB |
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| CN205782875U true CN205782875U (en) | 2016-12-07 |
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| CN201620495049.3U Expired - Fee Related CN205782875U (en) | 2016-05-27 | 2016-05-27 | A kind of secondary wind air-distribution device for CFBB |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105864754A (en) * | 2016-05-27 | 2016-08-17 | 青岛金田热电有限公司 | Secondary air distribution device used for circulating fluidized bed boiler |
| CN109185872A (en) * | 2018-10-17 | 2019-01-11 | 烟台龙源电力技术股份有限公司 | A kind of boiler secondary wind system |
-
2016
- 2016-05-27 CN CN201620495049.3U patent/CN205782875U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105864754A (en) * | 2016-05-27 | 2016-08-17 | 青岛金田热电有限公司 | Secondary air distribution device used for circulating fluidized bed boiler |
| CN105864754B (en) * | 2016-05-27 | 2018-05-15 | 青岛金田热电有限公司 | A kind of Secondary Air air-distribution device for circulating fluidized bed boiler |
| CN109185872A (en) * | 2018-10-17 | 2019-01-11 | 烟台龙源电力技术股份有限公司 | A kind of boiler secondary wind system |
| CN109185872B (en) * | 2018-10-17 | 2023-09-19 | 烟台龙源电力技术股份有限公司 | Secondary air system of boiler |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 |