CN201740019U - Biomass gasification gas reburning system in coal-fired fluidized bed - Google Patents
Biomass gasification gas reburning system in coal-fired fluidized bed Download PDFInfo
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- CN201740019U CN201740019U CN2010202477239U CN201020247723U CN201740019U CN 201740019 U CN201740019 U CN 201740019U CN 2010202477239 U CN2010202477239 U CN 2010202477239U CN 201020247723 U CN201020247723 U CN 201020247723U CN 201740019 U CN201740019 U CN 201740019U
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- coal
- fluidized bed
- gasified gas
- biomass gasified
- gasification gas
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Abstract
The utility model belongs to the technical field of N2O exhaust reduction of a coal-fired fluidized bed, in particular to a biomass gasification gas system in the coal-fired fluidized bed. Through a plurality of biomass gasification gas spray openings arranged on a furnace wall of a fluidized bed boiler, biomass gasification gas is introduced into a furnace hearth of the fluidized bed boiler, the biomass gasification gas reacts with N2O-containing smoke gas generated by coal power burning in the furnace hearth, the multi-stage burning is realized, the burning efficiency of the whole fluidized bed can be improved, and the exhaust of N2O is reduced. The utility model uses the mixed burning of the biomass gasification gas and the coal powder. Compared with the themolysis and the direct burning, the utility model has the advantages that the biomass gasification gas with rich combustible substances such as H2, CH4, CO and the like has low ash content and low sulphur content, does not have the desulfuration problem, belongs to ideal reburning fuel, and can effectively reduce the exhaust of nitric oxides. Because the content of alkali metal and chlorine in the biomass gasification gas is very low, the problems of slag formation and corrosion can be avoided, in addition, the utilization of coal ash can not be influenced, and the efficient clean utilization of biomass can be realized.
Description
Technical field
The utility model belongs to coal-fired fluidized bed reduction N
2O draining technology field, particularly a kind of coal-fired fluidized bed middle biomass gasified gas re-burning system can be used for coal dust and biomass gasified gas mixed combustion, reduces N
2The O discharging.
Background technology
The recirculating fluidized bed generation technology is swift and violent in China's development in recent years, and the recirculating fluidized bed of 300MW grade (CFB) power station has many operations, compares CFBB NO with the conventional pulverized-coal stove
XAnd SO
XConcentration of emission is low, but another kind of pollutant N
2The concentration of emission of O is generally 39～589mg/Nm
3, sometimes even reach 786mg/Nm
3, far above traditional coal-powder boiler N
2The O discharging is less than 20mg/Nm
3Level.N
2O is commonly called as laughing gas, and as one of six kinds of greenhouse gases stipulating in the Kyoto Protocol, the harm that its discharging produces mainly shows stronger greenhouse effects and two aspects of depletion of the ozone layer.The N that annual mankind's activity produces
2O accounts for the annual whole world and generates 31% of total amount, wherein the N of mankind's activity generation
2Burning from fossil fuel is arranged more than 80%, the N that causes by mankind's activity among the O
2The O annual emissions is just with about 0.25% speed increase every year on average.N in the atmosphere
2The concentration of the O 285ppbv before the industrial revolution is increased to present 310ppbv, and increases with annual 0.2～0.3% speed.N
2O can the absorbent core wavelength be the LONG WAVE INFRARED radiation of 7.78 μ m, 8.56 μ m and 16.98 μ m, and its contribution to greenhouse effects is CH
42.5 times, etc. molar concentration N
2The potentiality that heats of O is CO
2150 times, the influence of terrestrial radiation is about CO
210～15%, can reach 120 years in the troposphere time of staying, be transferred in the stratosphere and can be converted into NO, and then cause the destruction of ozone layer, N
2The hazard ratio NO of O is more serious.Therefore when utilizing the circulating fluidized bed combustion coal technological merit, take corresponding technical measures to reduce N
2The discharging of O.
Usually reduce fire coal circulating fluid bed boiler N
2The method of O discharging has:
1. adopt catalyst can reduce N
2The O decomposition activation energy, all poly-metal deoxides are to N
2O has certain decomposition, but owing to contain a large amount of dust in the fluid bed flue gas, as adopting catalyst reduction N
2O might stop up or damage catalyst.
2. change combustion conditions is as adopting sectional combustion, classification air intake, excess air coefficient, bed temperature, fuel performance, the bed time of staying etc.
3. burst pulse corona discharge, the burst pulse corona discharge can generate a lot of atoms and atomic group, as NO
+, O
+,
Deng, the interaction between these atoms, atomic group, the gas may influence N
2The generation of O and decomposition.And its N
2Relevant under the condition that is reflected at the burst pulse corona discharge that O decomposes with frequency, voltage and the duration of discharge.
4. biomass molding fuel is directly fed in the stove and coal dust mixed combustion, because alkali metal salt that biomass combustion produces and phosphate cpd can cause corrosion and coking to the fluid bed internal structure.
5. feed combustible gas (as methane) and improve flue-gas temperature reduction N
2O is simple method, but needs special-purpose gas pipeline, restricted by combustion gas grade and economy, and its application is affected.
Patent 2501564 has disclosed a kind of device with denitration by refueling pyrolysis gas of biomass.This device mainly comprise gasification furnace, coal-powder boiler and between connection, the gasification furnace intake stack is communicated with the coal-powder boiler back-end ductwork, the gasification furnace wind pipe is communicated with the burner hearth of coal-powder boiler.This device is mainly used in the NO of coal-powder boiler
XReduce discharging, and be not suitable in the recirculating fluidized bed.
Patent 1963299 has disclosed utilizes coal dust and living beings to mix combustion reduction NO again
XThe method and the steam generator system of discharging.It is characterized in that the reburning zone is divided into one-level reburning zone and secondary reburning zone, send into coal dust to the one-level reburning zone, with living beings after super-dry, grinding preliminary treatment to secondary reburning zone spray feed; Mainly finish pulverized coal pyrolysis and coke generative process in the one-level reburning zone, in the secondary reburning zone, realize NO
XReduction reaction utilizes anoxia condition to like fugitive constituent burning and coke to CO and the catalytic reduction effect that NO reacts, and further reduces the NO of generation in the primary zone
X, reach the purpose of low emission.This installs direct biomass burning, can produce problems such as coking, corrosion.
Patent 101021316 has disclosed directly combustion and out of stock method and the device of smoke gas recirculating technology again of living beings.This device also is directly to utilize recombustion of biomass, the same problems such as obstruction, coking corrosion that exist.
Summary of the invention
The purpose of this utility model is at pollutant N fire coal circulating fluid bed in the prior art
2The O discharge capacity provides a kind of coal-fired fluidized bed middle biomass gasified gas re-burning mode far above common coal-burning boiler.
The technical solution adopted in the utility model is: the structure of biomass gasified gas re-burning system comprised during this was coal-fired fluidized bed: air compartment, and the fluidized-bed combustion boiler of air compartment top, the fluid bed boiler furnace bottom is provided with air distribution plate, and the air that enters boiler can evenly be distributed; The feeder that is connected with the boiler feed mouth is by the conveying feed of screw(-type) feeder or apron feeder realization pulverized coal particle; The cyclone separator that is connected with the boiler exhaust mouth, and the material return system that between cyclone separator and boiler feedback outlet, is connected by standpipe; Longshore current fluidized bed boiler height is arranged 1～12 burner nozzle on the furnace wall, and at fluid bed burner hearth top a plurality of afterburning air ports is set; Between the burner nozzle of described fluidized-bed combustion boiler furnace wall and afterburning air port, a plurality of biomass gasified gas spouts are set, and arrange 1 biomass gasified gas spout at the cyclone inlet place.
Described biomass gasified gas spout is along the uniform layered arrangement of furnace height, totally 1～4 layer, arrange four biomass gasified gas spouts for every layer, every layer of biomass gasified gas spout all arranged by the mode of quadrangle tangential circle, make the interior flue gas of boiler be rotated burning, strengthen and mix; Air distribution plate 1.5～the 3m of undermost biomass gasified gas jet opening distance fluidized-bed combustion boiler bottom.
Described burner is arranged four burner nozzles for every layer along the uniform layered arrangement of furnace height, and every layer of burner nozzle all arranged by the mode of quadrangle tangential circle.
Described afterburning air port is arranged four afterburning air ports for every layer along the uniform layered arrangement of furnace height, and every layer of afterburning air port all arranged by the mode of quadrangle tangential circle.
The beneficial effects of the utility model are: difficult broken because living beings are different, and mix before firing with directly mixed combustion and can cause problems such as Bunker obstruction; Alkali metal and chlorinity are higher in the biomass fuel, and direct and coal dust causes slagging scorification and corrosion easily when furnace high-temperature burns, and may influence the utilization that mixes the combustion ash, also might influence the service life of follow-up denitrating system catalyst.And the utility model provide a kind of coal-fired fluidized bed in the biomass gasified gas re-burning system, be living beings to be handled produce biomass gasified gas and send into coal-fired fluidized bed furnace combustion zone again and carry out reductive NO
XA kind of combustion system.Utilize biomass gasified gas and coal dust mixed combustion, compare with directly burning, be rich in H with pyrolysis
2, CH
4Low with the biogas content of ashes of combustibles such as CO, sulfur content is extremely low, does not have desulphurization problem, is desirable reburning fuel, can effectively lower the discharging of nitrogen oxide; Because alkali metal and chlorinity are lower in the gasification gas, can avoid slagging scorification and etching problem, and can not influence utilization of coal ash, can realize the high-efficiency cleaning utilization of living beings.This technology can be with near the living beings such as agriculture and forestry organic waste material the power plant at power plant's gasification, and combustion, has not only utilized the energy in the living beings but also has reduced nitrogen oxide emission, flue gas disposal cost, and realized the utilization again of agriculture and forestry organic waste material matter.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Number in the figure:
The 1-air compartment, 2-fluidized-bed combustion boiler, 3-feeder, 4-burner nozzle, 5-biomass gasified gas spout, 6-afterburning air port, 7-cyclone separator, 8-material return system.
The specific embodiment
The utility model provides a kind of coal-fired fluidized bed middle biomass gasified gas re-burning mode and system, below by the description of drawings and the specific embodiment the utility model is described further.
As shown in Figure 1, the arranged beneath air compartment 1 of fluidized-bed combustion boiler 2, fluidized-bed combustion boiler 2 lower furnace portion are provided with air distribution plate, and the air that enters boiler can evenly be distributed; Feeder 3 is connected with the boiler feed mouth, realizes the conveying feed of pulverized coal particle by screw(-type) feeder or apron feeder; Longshore current fluidized bed boiler 2 short transverses are arranged 1～12 burner nozzle 4 and 1～12 afterburning air port 6 on the furnace wall, and between burner nozzle 4 and afterburning air port 6, arrange 4～12 biomass gasified gas spouts 5, described burner nozzle 4, biomass gasified gas spout 5 and the 6 equal layerings of afterburning air port are arranged, every layer of mode by quadrangle tangential circle arranged, make the interior flue gas of boiler be rotated burning, strengthen and mix; Cyclone separator 7 is connected with the boiler exhaust mouth, and is connected by standpipe between cyclone separator 7 and boiler feedback outlet material return system 8 is set; Arrange 1 biomass gasified gas spout in cyclone separator 7 porch.
The biogas that the biomass gasified gas spout injects is that biomass fuel (farming, woods, herding discarded object and house refuse etc.) is by pyrolysis or gasification mode (air gasification, steam gasification, H
2Modes such as gasification and combined gasification) fuel gas that produces comprises H
2, CH
4, CO and C
nH
mBiomass gasified gas injects from biomass gasified gas spout 5, with the coal dust fuel that injects from fuel inlet 3 feeders, provide under the effect of air air quantity at burning wind air compartment 1, mixed combustion in fluidized-bed combustion boiler 2, in the combustion reaction process, fluidized bed combustion chamber is in 800～980 ℃ state of temperature.Burning produces flue gas and discharges from roof of the furnace and flow into cyclone separator 7, re-injects N in fuel gas and the combustion product gases at the biomass gasified gas spout 5 of cyclone separator 7 inlets
2O reacts.Under the effect of air-flow, the part solid fuel is brought into cyclone separator 7, and cyclone separator 7 is realized gas solid separation, and gas is discharged from cyclone separator 7 tops, solid flows to the material returning device 8 that is connected with fluidized-bed combustion boiler 2 from separator 7 bottom down-comers, realizes the material circulation.Consider the characteristic of actual cycle fluid bed, can inject other auxiliary reagents such as desulfurizing agent calcium oxide in this device fluidized bed combustion chamber simultaneously, guarantee NO in the combustion product
XAnd SO
XLow emission.
Embodiment 1:
Biomass gasified gas re-burning system in the 135MW CFBB.
In this embodiment, utilize the utility model to replace original combustion system, to reduce N
2The discharging of O.135MW CFBB, fuel low heat valve are 12435kJ/kg, and Fuel Consumption is 78230kg/h.200,000 tons of living beings of year consumption, 680 ℃ of living beings gasification temperature.In this embodiment, from air distribution plate up 3m to roof of the furnace, according to quadrangle tangential circle be furnished with 7 grades the burning spouts, wherein beneath 2 grades is burner nozzle, middle 3 grades of gasification substance gas blowout mouths of making a living feed biogas flow velocity 42m/s, and the top is the afterburning air port for 2 grades.
This boiler uses the biomass gasified gas re-burning system, and the calorific value of biogas accounts for 13.22% of gross calorific value, and it is 8.89% that biogas accounts for exhaust gas volumn, can reduce to consume 13.22% fire coal, makes N simultaneously
2The O removal efficiency reaches more than 99%.
Embodiment 2:
Biomass gasified gas re-burning system in the 300MW CFBB.
In this embodiment, by around burner hearth, increasing the biomass gasified gas spout, combustion system is transform as the combustion system of fuel staging biomass gasified gas re-burning.300MW CFBB, fuel low heat valve are 19887kJ/kg, and Fuel Consumption is 148600kg/h.200,000 tons of living beings of year consumption, 690 ℃ of living beings gasification temperature.In this embodiment, from air distribution plate up 2.5m to roof of the furnace, according to quadrangle tangential circle be furnished with 6 grades the burning spouts, be respectively 2 grades of burner nozzles, 2 grades of biomass gasified gas spouts, 2 grades of afterburning air ports, wherein the biogas flow velocity 40m/s of Tong Ruing.
This boiler uses the biomass gasified gas re-burning system, and the calorific value of biogas accounts for 4.35% of gross calorific value, and it is 2.8% that biogas accounts for exhaust gas volumn, can reduce to consume 4.35% fire coal, makes N simultaneously
2The O removal efficiency reaches more than 99%.
Claims (4)
1. a coal-fired fluidized bed middle biomass gasified gas re-burning system is characterized in that longshore current fluidized bed boiler height is arranged 1～12 burner on the furnace wall, and at fluid bed burner hearth top a plurality of afterburning air ports is set; Between the burner nozzle of described fluidized-bed combustion boiler furnace wall and afterburning air port, a plurality of biomass gasified gas spouts are set, and arrange 1 biomass gasified gas spout at the cyclone inlet place.
2. coal-fired fluidized bed middle biomass gasified gas re-burning system according to claim 1, it is characterized in that: described biomass gasified gas spout is along the uniform layered arrangement of furnace height, totally 1～4 layer, arrange four biomass gasified gas spouts for every layer, every layer of biomass gasified gas spout all arranged by the mode of quadrangle tangential circle; Air distribution plate 1.5～the 3m of undermost biomass gasified gas jet opening distance fluidized-bed combustion boiler bottom.
3. coal-fired fluidized bed middle biomass gasified gas re-burning system according to claim 1, it is characterized in that: described burner nozzle is along the uniform layered arrangement of furnace height, arrange four burner nozzles for every layer, every layer of burner nozzle all arranged by the mode of quadrangle tangential circle.
4. coal-fired fluidized bed middle biomass gasified gas re-burning system according to claim 1, it is characterized in that: described afterburning air port is along the uniform layered arrangement of furnace height, arrange four afterburning air ports for every layer, every layer of afterburning air port all arranged by the mode of quadrangle tangential circle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202477239U CN201740019U (en) | 2010-07-05 | 2010-07-05 | Biomass gasification gas reburning system in coal-fired fluidized bed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202477239U CN201740019U (en) | 2010-07-05 | 2010-07-05 | Biomass gasification gas reburning system in coal-fired fluidized bed |
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| CN201740019U true CN201740019U (en) | 2011-02-09 |
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|---|---|---|---|
| CN2010202477239U Expired - Fee Related CN201740019U (en) | 2010-07-05 | 2010-07-05 | Biomass gasification gas reburning system in coal-fired fluidized bed |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915419A (en) * | 2010-07-05 | 2010-12-15 | 华北电力大学 | Biomass gasified gas re-burning mode and system for coal-fired fluidized bed |
| CN105003906A (en) * | 2015-07-29 | 2015-10-28 | 重庆巴洛克新能源有限公司 | Cliff type multi-level biomass burning device |
| CN108119896A (en) * | 2017-12-18 | 2018-06-05 | 国网新疆电力有限公司电力科学研究院 | It is a kind of to improve accurate eastern coal combustion slagging, the multifuel combustion method of fouling characteristics |
| CN109126642A (en) * | 2016-04-15 | 2019-01-04 | 四川省雷波明信化工有限公司 | A kind of combustion method for fluidized bed |
| JP2020012627A (en) * | 2018-07-19 | 2020-01-23 | コリア インスティテュート オブ インダストリアル テクノロジーＫｏｒｅａ Ｉｎｓｔｉｔｕｔｅ Ｏｆ Ｉｎｄｕｓｔｒｉａｌ Ｔｅｃｈｎｏｌｏｇｙ | Sand falling type circulating fluidized bed boiler having a plurality of riser sections and operation method thereof |
-
2010
- 2010-07-05 CN CN2010202477239U patent/CN201740019U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915419A (en) * | 2010-07-05 | 2010-12-15 | 华北电力大学 | Biomass gasified gas re-burning mode and system for coal-fired fluidized bed |
| CN101915419B (en) * | 2010-07-05 | 2012-05-30 | 华北电力大学 | Biomass gasified gas re-burning mode and system for coal-fired fluidized bed |
| CN105003906A (en) * | 2015-07-29 | 2015-10-28 | 重庆巴洛克新能源有限公司 | Cliff type multi-level biomass burning device |
| CN105003906B (en) * | 2015-07-29 | 2018-05-25 | 重庆森盟新能源开发有限公司 | A kind of precipice formula multi-stage biological matter burner |
| CN109126642A (en) * | 2016-04-15 | 2019-01-04 | 四川省雷波明信化工有限公司 | A kind of combustion method for fluidized bed |
| CN109126642B (en) * | 2016-04-15 | 2021-09-21 | 雷波明信实业发展有限公司 | Combustion method for fluidized bed |
| CN108119896A (en) * | 2017-12-18 | 2018-06-05 | 国网新疆电力有限公司电力科学研究院 | It is a kind of to improve accurate eastern coal combustion slagging, the multifuel combustion method of fouling characteristics |
| JP2020012627A (en) * | 2018-07-19 | 2020-01-23 | コリア インスティテュート オブ インダストリアル テクノロジーＫｏｒｅａ Ｉｎｓｔｉｔｕｔｅ Ｏｆ Ｉｎｄｕｓｔｒｉａｌ Ｔｅｃｈｎｏｌｏｇｙ | Sand falling type circulating fluidized bed boiler having a plurality of riser sections and operation method thereof |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110209 Termination date: 20180705 |
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| CF01 | Termination of patent right due to non-payment of annual fee |