CN205782866U - Effectively reduce the CFBB of oxycarbide discharge - Google Patents
Effectively reduce the CFBB of oxycarbide discharge Download PDFInfo
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- CN205782866U CN205782866U CN201620495050.6U CN201620495050U CN205782866U CN 205782866 U CN205782866 U CN 205782866U CN 201620495050 U CN201620495050 U CN 201620495050U CN 205782866 U CN205782866 U CN 205782866U
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Abstract
The utility model discloses the CFBB effectively reducing oxycarbide discharge, including combustion furnace, the cyclone separator being connected with combustion furnace and the secondary air system being used for arranging secondary wind, furnace exit is connected with cyclone inlet, Cyclone outlet sets a secondary furnace, burnout degree it is passed through in secondary furnace, described secondary air system includes secondary air channel, it is placed in combustion furnace 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, this utility model is mixed into partial fume in First air and secondary wind, reduce NOxDischarge, secondary wind arrangement achieves classification and the horizontal direction classification of secondary wind short transverse, arranges secondary furnace at separator outlet, and the carbon in the flying dust that separator outlet is thinner burns in secondary furnace again, reduce unburned carbon in flue dust, can effectively solve combustion furnace oxygen content and reduce the NO causedxThe contradiction that discharge reduces and unburned carbon in flue dust is high.
Description
Technical field
This utility model belongs to technical field of boiler combustion, particularly to the CFBB effectively reducing oxycarbide discharge.
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；(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 750-800 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 (volatile matter) of gas phase nitrogen and coke.
It is generally believed that fuel type NOxBeing that the nitrogen compound contained in fuel thermally decomposes in combustion, oxidation step of going forward side by side generates, and meanwhile, there is also the reduction reaction of NO；Fuel type NOxGenerate with reduction except with outside the Pass when coal characteristic, form that coal nitrogen compound exists, nitrogen pyrolysis in fuel, in volatile matter and coke, the ratio of distribution and respective composition have, also close with the factor relation such as oxygen concentration, temperature.Excess air coefficient is the highest, and the oxygen amount in oxygen is the highest, fuel type NOxGeneration concentration and conversion ratio the highest, there are some researches show, square being directly proportional of the generating rate of fuel type NOx and the oxygen concentration of combustion zone.Therefore fuel type NO is controlledxConversion ratio and the technical measures of growing amount be to reduce excess air coefficient, at NOxProduction district use fuel-rich combustion mode, be largely effective and reduce discharging NO eailyxTechnical measures.It is generally believed that fuel type NO mainly generates at the precipitation of volatile matter and combustion phases, about starting when 750 DEG C to separate out, this temperature is lower than the temperature of flame, and fuel bound nitrogen all can decompose when reaching pyrolysis temperature, and ultimately generates NOx, under the high temperature when coke occurs burning, fuel type NOxConversion ratio reach maximum.When temperature raises, the NO that the reduction reaction of NO makes part generate in coke surface is reduced into N2, thus, within the scope of certain temperature, the generating rate of NO and rate of reduction, close to balance, make NO obtain growing amount change little.When temperature raises further, the reduction reaction rate of the NO generating rate more than NO, make NOxObtain growing amount to decrease, but, thermal NO when temperature raisesxGrowing amount also sharply increase.
CFBB has the distinguishing feature that discharged nitrous oxides is low, and its main cause one is that ignition temperature is low, only 850-1000 DEG C, therefore thermal NOxSeldom；Two be due to the solid-state bed in burner hearth along furnace height to NOxDestruction；Three is that CFBB is generally configured to air stage feeding mode, makes emulsion zone be in reducing atmosphere.But CFBB still has the space that low nitrogen burning is transformed.
The patent of invention of Application No. 201310351741X, disclose a kind of Horizontal type circulating fluid bed heat-conducting oil furnace, it includes charging gear, main combustion chamber, subsidiary combustion chamber, secondary furnace, cyclone separator, separator outlet flue and air-introduced machine, intersection at main combustion chamber emulsion zone Yu dilute-phase zone, the arranged beneath overfire air device of subsidiary combustion chamber and secondary furnace, proportioning by First air Yu secondary wind, effectively control the generation of nitrogen oxides, but after boiler-secondary furnace twice combustion, the when of entering separator, air quantity is the biggest, the effect of cyclone separator can be affected, some bulky grain things are made not separated, it is expelled directly out with flue gas, unburned carbon in flue dust is higher.
Research shows, reduces primary air flow and total blast volume, and the oxygen content reducing burner hearth is to reduce NOxThe effective means of discharge, but oxygen at furnace exit reduction will necessarily increase unburned carbon in flue dust and smoke evacuation CO content raises, and reduces boiler combustion efficiency.Accordingly, it would be desirable to design can reduce discharged nitrous oxides can effectively reduce again oxycarbide discharge, improve fuel economy CFBB.
Summary of the invention
The deficiency existed for prior art, technical problem to be solved in the utility model is, a kind of reasonable Arrangement First air, secondary wind, burnout degree are provided, low-nitrogen oxide discharging, low-carbon (LC) emissions of oxides, CFBB that fuel economy is high can be realized.
nullFor solving above-mentioned technical problem，Technical solution adopted in the utility model is: effectively reduce the CFBB of oxycarbide discharge，Including the combustion furnace laying water-cooling wall on surrounding wall in stove、The cyclone separator being connected with combustion furnace and the secondary air system being used for arranging secondary wind，Offer on water-cooling wall and allow pipe，Upper furnace is dilute phase zoneofoxidation、Bottom is close phase reducing zone，The water-cooled distributor for First air cloth wind is set bottom combustion furnace，Furnace exit is connected with cyclone inlet，Cyclone separator is connected with Mi Xiang reducing zone, combustion furnace by being located at the material-returning device of bottom，Described Cyclone outlet sets a secondary furnace，It is passed through burnout degree in described secondary furnace，Described secondary air system includes secondary air channel、It is placed in combustion furnace 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 combustion furnace dilute phase zoneofoxidation，Described secondary wind is the mixture of air and circulating flue gas，Described allow pipe include single hole allows pipe and diplopore allow pipe.
Further, described burnout degree is air, and burnout degree accounts for the 5-20% of total blast volume.
Further, secondary wind header is set between described secondary air channel and secondary wind standpipe, it is ensured that the secondary wind sprayed in combustion furnace from each overfire air port is heated evenly, reduces thermal deviation.
Further, front wall both sides, described combustion furnace 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, behind described combustion furnace, 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 combustion furnace by the single hole on the front water wall of combustion furnace, and the double spout of described front wall allows pipe that secondary wind is sprayed into combustion furnace by the diplopore on the front water wall of combustion furnace.
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 described overfire air port distance water-cooling wall.
Further, described secondary wind riser length is 6-8 times of its caliber.
Compared with prior art, this utility model advantage is:
(1) furnace exit is connected with cyclone inlet, and bulky grain thing enters combustion furnace by the material-returning device bottom cyclone separator, burns away；
(2) arranging secondary furnace at separator outlet, and spray into burnout degree, the carbon in the flying dust that separator outlet is thinner burns in secondary furnace again, reduces unburned carbon in flue dust, can effectively solve combustion furnace oxygen content and reduce the NO causedxThe contradiction that discharge reduces and unburned carbon in flue dust is high；
(3) in total blast volume one timing, add after-flame air quantity and just decrease First air and secondary air flow, cause Ultra Low-oxygen burning in combustion furnace, increase reducing zone, NOxThe time of staying in reducing zone is long, and NO can be greatly loweredxDischarge；
(4) partial fume 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, is conducive to avoiding the formation of district of localized hyperthermia, thus reduces NOxGenerate；Additionally use flue gas recirculation to improve burner hearth and the flow velocity in heat convection district to a certain extent, be conducive to improving Cyclone efficiency, improve circulating ratio, extend the flying dust time of staying in stove, beneficially fly ash refiring；Circulating ash quantity increases simultaneously, is also beneficial to control material layer temperature, and flue gas recirculation reduces the bulk temperature of burner hearth, is also beneficial to reduce nitrogen oxides；
(5) 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, adjust the caliber of overfire air port standpipe, not only achieve the classification of secondary wind short transverse, realize horizontal direction classification simultaneously, add the perturbation action of flue gas in burner hearth, make full combustion of fuel, reduce NOxGeneration；
(6) 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；
(7) 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.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the layout schematic diagram of combustion furnace of the present utility model inner second air spout；
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.
nullSuch as Fig. 1、2、3、Shown in 4，Effectively reduce the CFBB of oxycarbide discharge，Including the combustion furnace 1 laying water-cooling wall on surrounding wall in stove、The cyclone separator 7 being connected with combustion furnace 1 and the secondary air system being used for arranging secondary wind，Offer on water-cooling wall and allow pipe，Top, combustion furnace 1 is dilute phase zoneofoxidation、Bottom is close phase reducing zone，The water-cooled distributor 10 for First air cloth wind is set bottom combustion furnace 1，Combustion furnace 1 outlet is connected with cyclone separator 7 import，Pipe 8 and material-returning device 9 is set up bottom cyclone separator 7，Material-returning device 9 phase close with combustion furnace 1 reducing zone is connected，Cyclone separator 7 outlet sets a secondary furnace 6，It is passed through burnout degree in secondary furnace 6，Burnout degree is air，Burnout degree accounts for the 5-20% of total blast volume，Secondary air system includes secondary air channel 5、It is placed in combustion furnace front wall 11、Many secondary wind standpipes outside wall 14 3 and be arranged on water-cooling wall the overfire air port 2 being connected with secondary wind standpipe 3 behind combustion furnace，Overfire air port 2 includes double spout and single jet，Overfire air port 2 layered arrangement is in combustion furnace 1 dilute phase zoneofoxidation，Secondary wind is the mixture of air and circulating flue gas，Described allow pipe include single hole allows pipe and diplopore allow pipe.
Secondary wind header 4 is set between secondary air channel 5 and secondary wind standpipe 3, it is ensured that the secondary wind sprayed in combustion furnace 1 from each overfire air port 2 is heated evenly, reduces thermal deviation.
Combustion furnace front wall 11 both sides respectively set a standpipe connecting front wall single jet 12, centre sets two standpipes connecting the double spout 13 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 described front wall single jet 12 spout 13 double with front wall are positioned on same level line, to reach the classification of secondary wind short transverse, described front wall single jet 12 allows pipe 19 that secondary wind sprays into combustion furnace 1 by the front wall single hole on the front water wall 18 of combustion furnace 1, the double spout 13 of front wall allows pipe 20 that secondary wind sprays into combustion furnace 1 by the front wall diplopore on the front water wall 18 of combustion furnace 1.
nullBehind combustion furnace, wall 14 sets five secondary wind standpipes，Two, both sides secondary wind standpipe connects the double spout 17 in Hou Qiang both sides，Double spouts 15 in the middle of wall after middle secondary wind standpipe connection，Wall single jet 16 after remaining two secondary wind standpipes connection，In the middle of rear wall, the spacing of two spouts of double spouts 15 is more than two spouts of the double spout 17 in Hou Qiang both sides，Connect the caliber of the standpipe of double spouts 15 in the middle of the double spouts 17 in Hou Qiang both sides and rear wall be connect after 2-3 times of standpipe caliber of wall single jet 16，To reach the classification of secondary wind horizontal direction，Described rear wall single jet 16、In the middle of the upper spout of the double spout 17 in Hou Qiang both sides and rear wall, the upper spout of double spouts 15 is positioned on same level line，In the middle of the lower spout of the double spout 17 in Hou Qiang both sides and rear wall, the centre position of double 15 two spouts of spout is positioned on same level line，To reach the classification of secondary wind short transverse，Described rear wall single jet 16 allows pipe 23 that secondary wind sprays into combustion furnace 1 by the rear wall single hole on the rear water wall 21 of combustion furnace 1，The double spout 17 in Hou Qiang both sides allows pipe 24 that secondary wind sprays into combustion furnace 1 by the Hou Qiang both sides diplopore on the rear water wall 21 of combustion furnace 1，In the middle of rear wall, double spouts 15 allow pipe 22 that secondary wind sprays into combustion furnace 1 by diplopore in the middle of the rear wall on the rear water wall 21 of combustion furnace 1.
The double spout 13 of front wall bottom front water wall 18 not less than in the middle of 1.5m, rear wall double spouts 15 bottom rear water wall 21 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。
6-8 times of secondary wind standpipe 3 its caliber a length of, to guarantee to be formed the jet jeting effect of good secondary wind entrance combustion furnace 1, keeps basic range not spread.
Coal dust at close phase reducing zone, combustion furnace 1 low oxygen combustion, reduces generation NO under First air effectxResponse rate, it is suppressed that NOxAt this aflame growing amount, by overfire air port 2, secondary wind is sent into burner hearth, flue gas produced with under the conditions of the low oxygen combustion of close phase reducing zone mixes, secondary wind is the mixture of air and circulating flue gas, partial fume is mixed in secondary wind, is conducive to increasing the wind speed of overfire air port, strengthening dilute phase zoneofoxidation gas-solid, the mixing of gas gas, be conducive to avoiding the formation of district of localized hyperthermia, thus reduce NOxGenerate, flue gas recirculation is additionally used to improve burner hearth and the flow velocity in heat convection district to a certain extent, be conducive to improving Cyclone efficiency, improve circulating ratio, extend the flying dust time of staying in stove, beneficially fly ash refiring, circulating ash quantity increases simultaneously, being also beneficial to control material layer temperature, flue gas recirculation reduces the bulk temperature of burner hearth, is also beneficial to reduce nitrogen oxides.
After the low oxygen combustion of combustion furnace 1, ash-laden gas enters cyclone separator 7, bulky grain thing enters combustion furnace 1 by the standpipe 8 bottom cyclone separator 7, material-returning device 9, burn away, thinner flying dust enters the secondary furnace 6 of separator 7 outlet with flue gas, is passed through burnout degree in secondary furnace, and the carbon in flying dust burns in secondary furnace 6 again, reduce unburned carbon in flue dust, can effectively solve combustion furnace oxygen content and reduce the NO causedxThe contradiction that discharge reduces and unburned carbon in flue dust is high.
In sum, this utility model arranges secondary furnace at separator outlet, and sprays into burnout degree, and the carbon in the flying dust that separator outlet is thinner burns in secondary furnace again, reduces unburned carbon in flue dust, can effectively solve combustion furnace oxygen content and reduce the NO causedxThe contradiction that discharge reduces and unburned carbon in flue dust is high；In total blast volume one timing, add after-flame air quantity and just decrease First air and secondary air flow, cause Ultra Low-oxygen burning in combustion furnace, increase reducing zone, NOxThe time of staying in reducing zone is long, and NO can be greatly loweredxDischarge；Secondary air system of the present 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 simultaneously, add the perturbation action of flue gas in burner hearth, make full combustion of fuel, reduce NOxGeneration.
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)
- null1. effectively reduce the CFBB of oxycarbide discharge，Including the combustion furnace laying water-cooling wall on surrounding wall in stove、The cyclone separator being connected with combustion furnace and the secondary air system being used for arranging secondary wind，Offer on water-cooling wall and allow pipe，Upper furnace is dilute phase zoneofoxidation、Bottom is close phase reducing zone，The water-cooled distributor for First air cloth wind is set bottom combustion furnace，Furnace exit is connected with cyclone inlet，Cyclone separator is connected with Mi Xiang reducing zone, combustion furnace by being located at the material-returning device of bottom，It is characterized in that: described Cyclone outlet sets a secondary furnace，Described secondary air system includes secondary air channel、It is placed in combustion furnace 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 combustion furnace dilute phase zoneofoxidation，Described allow pipe include single hole allows pipe and diplopore allow pipe.
- The CFBB of effective reduction oxycarbide the most according to claim 1 discharge, it is characterized in that: front wall both sides, described combustion furnace 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.
- The CFBB of effective reduction oxycarbide the most according to claim 1 discharge, it is characterized in that: behind described combustion furnace, 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.
- The CFBB of effective reduction oxycarbide the most according to claim 1 discharge, it is characterised in that: secondary wind header is set between described secondary air channel and secondary wind standpipe.
- The CFBB of effective reduction oxycarbide the most according to claim 1 discharge, it is characterised in that: not less than 1.5m bottom described overfire air port distance water-cooling wall.
- The CFBB of effective reduction oxycarbide the most according to claim 1 discharge, it is characterised in that: described secondary wind riser length is 6-8 times of its caliber.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108866321A (en) * | 2018-09-05 | 2018-11-23 | 葫芦岛锌业股份有限公司 | A kind of fluidizing reactor handling the high lead and zinc concentrate of high-copper |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108866321A (en) * | 2018-09-05 | 2018-11-23 | 葫芦岛锌业股份有限公司 | A kind of fluidizing reactor handling the high lead and zinc concentrate of high-copper |
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