CN204611736U - Biomass fuel fires system and boiler again - Google Patents
Biomass fuel fires system and boiler again Download PDFInfo
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- CN204611736U CN204611736U CN201520285846.4U CN201520285846U CN204611736U CN 204611736 U CN204611736 U CN 204611736U CN 201520285846 U CN201520285846 U CN 201520285846U CN 204611736 U CN204611736 U CN 204611736U
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- 239000002028 Biomass Substances 0.000 title claims abstract description 135
- 239000000446 fuel Substances 0.000 title claims abstract description 56
- 238000000197 pyrolysis Methods 0.000 claims abstract description 53
- 238000002485 combustion reaction Methods 0.000 claims abstract description 47
- 239000007787 solid Substances 0.000 claims abstract description 44
- 238000005979 thermal decomposition reaction Methods 0.000 claims abstract description 22
- 238000010304 firing Methods 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- 239000002817 coal dust Substances 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 60
- 239000002956 ash Substances 0.000 description 42
- 238000005516 engineering process Methods 0.000 description 22
- 241000196324 Embryophyta Species 0.000 description 21
- 239000000047 product Substances 0.000 description 19
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 239000003245 coal Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000002309 gasification Methods 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 241000580063 Ipomopsis rubra Species 0.000 description 1
- 241001464837 Viridiplantae Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000007953 anoxia Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 208000018875 hypoxemia Diseases 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Combustion Of Fluid Fuel (AREA)
Abstract
The utility model discloses a kind of biomass fuel and fire system and boiler again.The biomass fuel again system of firing comprises boiler body, biomass silo, biomass pyrolysis furnace, gas-solid separator, main burner, coal-char combustion device and fire gas burner again, boiler body has burner hearth, main burner, coal-char combustion device and fire gas burner again and be all arranged on boiler body, main burner is positioned at primary zone, fire gas burner again and be positioned at reburning zone, coal-char combustion device is positioned at the upstream of reburning zone, the biomass outlet of biomass silo is connected with the biomass inlet of biomass pyrolysis furnace, the thermal decomposition product outlet of biomass pyrolysis furnace is connected with the thermal decomposition product entrance of gas-solid separator, the gas vent of gas-solid separator with fire gas burner again and be connected, the semicoke outlet of gas-solid separator is connected with coal-char combustion device.The utility model can avoid that living beings and coal dust are directly mixed to be fired, and improves the utilization rate of biomass energy simultaneously.
Description
Technical field
The utility model relates to thermal machine field, and particularly a kind of biomass fuel fires system and boiler again.
Background technology
In prior art, the thermal power generation based on coal is occupied an leading position.Along with the traditional energy source prices such as coal skyrocket, the combustion system of original coal-fired power station boiler seems more and more uneconomical, and not only cost of electricity-generating is high, also discharges a large amount of CO
2, SO
2, NOx, the pollutant such as dust, cause a series of environmental problem.Wherein (NOx comprises NO, NO to nitrogen oxide
2and N
2o) account for 67% of discharge capacity, one of main source being considered to atmosphere pollution, serious pollution is caused to atmospheric environment, threaten the life and health of the mankind.Increasingly strict along with national environmental protection policy, proposes higher environmental requirement to thermal power plant, from July, 2014, specifies that the concentration of emission of existing thermal power generation boiler nitrogen oxide is no more than 100mg/m
3.
The control measure of thermal power plant to NOx mainly contain low NOx combusting technology and SCR technology (SCR technology) two kinds.
SCR technology is most widely used and the most effective technology at present, but this technology there is initial outlay and operating cost is higher, and there is the security hidden trouble that ammonia reveals.
Low NOx combusting technology mainly comprises low oxygen combustion, flue gas recirculation, low-NOx combustor technology, air classification, reburning technology etc.Low NOx combusting technology cost is lower, but general reduction NOx amplitude is less.Usually, hypoxemia runs, and the NOx percent reduction of the low NOx combusting technologies such as flue gas recirculation, low-NOx combustor technology, air classification is 10 ~ 40%.And gaseous fuel reburning technology compares other low NOx combusting technologies has some superiority in NOx removes, can 60% ~ 70% be reached.
In denitration by refueling, mainly adopt natural gas as reburning fuel both at home and abroad.China's natural gas resource is mainly distributed in western part, and therefore east and the denitration of coastal area development natural gas reburning are restricted.
Biomass energy is the energy contained in living beings, comes from solar energy, is that green plants converts solar energy into chemical energy and is stored in the energy of living beings inside.The kind of living beings is a lot, and topmost in plant have timber and agricultural crop straw etc.Plant biomass energy is sulfur-bearing hardly, seldom nitrogenous, and being therefore a kind of clean renewable sources of energy, is one of green energy resource.Development take living beings as the reburning that the green energy resource of raw material carries out pulverized-coal fired boiler, and being that China strengthens improvement of the ecological environment, reduces the important channel of NOx pollutant, is again the important channel realizing biomass energy efficiency utilization, solve energy crisis.
Publication number is CN1963299A, denomination of invention be utilize coal dust and living beings mixing again combustion reduce the method for NOx emission and the Chinese patent application of steam generator system and propose and divide main combustion zone by stove combustion process, reburning zone and burning-out zone, reburning zone is divided into one-level reburning zone and secondary reburning zone, in one-level reburning zone, spray feed enters coal dust, by living beings through super-dry, to secondary reburning zone spray feed after grinding pretreatment, pulverized coal pyrolysis and coke generative process is mainly completed in one-level reburning zone, NOx reduction reaction is realized in secondary reburning zone, utilize the catalytic reduction effect that volatile combustion and coke react CO and NO under anoxia condition, the NOx generated in further reduction primary zone, reach the object of low NOx drainage.
Publication number is CN102121706A, denomination of invention is that the coal-burning boiler gasification of biomass that Chinese patent application that coal-burning boiler gasification of biomass fires system again proposes a kind of biomass energy technology field fires system again, in this system, auger feed system, gasification body of heater are all connected with gasification furnace by flange with rotation ash disposal system, auger feed system is positioned at the charging aperture place above gasification furnace side, rotate the bottom that ash disposal system is positioned at gasification body of heater, high temperature conveyance conduit is by Flange joint gasification furnace aerogenesis mouth and boiler oil spout.This Chinese patent application can stablize output gasification gas, as boiler reburning fuel by continous-stable process biomass material.
Realizing in process of the present utility model, inventor finds that above prior art exists following weak point:
Publication number is in the Chinese patent application of CN1963299A, mainly by directly spraying into reburning zone and the coal dust mixed combustion of pulverized-coal fired boiler after living beings powder process in pulverized-coal fired boiler.Because living beings are different, not easily fragmentation, directly mixed combustion can cause the problems such as Bunker blocking, in biomass fuel alkali metal and chlorinity higher, directly easily cause slagging scorification and corrosion with coal dust when furnace high-temperature burn, and may affect and mixedly fire grey utilization.
Publication number is in the Chinese patent application of CN102121706A, while biomass pyrogenation gasification produces pyrolysis gas, another kind of important products can be produced---semicoke, semicoke is a kind of solid product that living beings obtain after uniform temperature destructive distillation, and inside has abundant pore structure.This part semicoke fails reasonably to be utilized and process in the prior art, therefore affects the utilization rate of biomass energy, causes the waste of the energy and heat.
Utility model content
The purpose of this utility model is to provide a kind of biomass fuel to fire system and boiler again, is intended to avoid living beings and coal dust directly to mix and fires, improve the utilization rate of biomass energy simultaneously.
The utility model first aspect provides a kind of biomass fuel to fire system again, comprise boiler body, biomass silo, biomass pyrolysis furnace, gas-solid separator, main burner, coal-char combustion device and fire gas burner again, described boiler body has burner hearth, described burner hearth has the primary zone set gradually to downstream from upstream, reburning zone and burning-out zone, described main burner, described coal-char combustion device and the described gas burner that fires again are all arranged on described boiler body, described main burner is positioned at described primary zone, the described gas burner that fires again is positioned at described reburning zone, described coal-char combustion device is positioned at the upstream of described reburning zone, the biomass outlet of described biomass silo is connected with the biomass inlet of described biomass pyrolysis furnace, the thermal decomposition product outlet of described biomass pyrolysis furnace is connected with the thermal decomposition product entrance of described gas-solid separator, the gas vent of described gas-solid separator is connected with the described gas burner that fires again, the semicoke outlet of described gas-solid separator is connected with described coal-char combustion device.
Further, described biomass fuel fires system again and also comprises deduster, and the deduster entrance of described deduster is connected with the gas vent of described gas-solid separator, and the gas vent of described deduster is connected with the described gas burner that fires again.
Further, described biomass fuel fires system again and also comprises high-temperature blower, and the fans entrance of described high-temperature blower is connected with the gas vent of described gas-solid separator, and the fan outlet of described high-temperature blower is connected with the described gas burner that fires again.
Further, described biomass fuel fires system again and also comprises plant ash ash bucket, and the solid outlet of described deduster is connected with the ash bucket entrance of described plant ash ash bucket.
Further, described biomass fuel system of firing again also comprises plant ash delivery pump and plant ash ash silo, the pump intake of described plant ash delivery pump exports with the ash bucket of described plant ash ash bucket and is connected, and the pump discharge of described plant ash delivery pump is connected with the ash silo entrance of described plant ash ash silo.
Further, described burner hearth also comprises reducing zone, and described reducing zone is positioned at the downstream in described primary zone and is positioned at the upstream of described reburning zone, and described coal-char combustion device is positioned at described reducing zone.
Further, described biomass fuel fires system again and also comprises fire air nozzle, and described fire air nozzle to be arranged on described boiler body and to be positioned at described burning-out zone.
Further, described biomass fuel system of firing again also comprises the heat exchanger of the sensible heat of the pyrolysis gas of biomass of the gas vent for reclaiming described gas-solid separator.
The utility model second aspect provides a kind of boiler, comprises biomass fuel and fires system again, and described biomass fuel fires the biomass fuel of system according to any one of the utility model first aspect again and fires system again.
The biomass fuel provided based on the utility model fires system and boiler again, the biomass fuel again system of firing comprises boiler body, biomass silo, biomass pyrolysis furnace, gas-solid separator, main burner, coal-char combustion device and fires gas burner again, the biomass outlet of biomass silo is connected with the biomass inlet of biomass pyrolysis furnace, the thermal decomposition product outlet of biomass pyrolysis furnace is connected with the thermal decomposition product entrance of gas-solid separator, the gas vent of gas-solid separator with fire gas burner again and be connected, the semicoke outlet of gas-solid separator is connected with coal-char combustion device.This biomass fuel fires system again and the pyrolysis gas of biomass in the thermal decomposition product of biomass pyrolysis furnace is delivered to reburning zone burning as reburning fuel by the gas vent of gas-solid separator, semicoke in thermal decomposition product is delivered to the reburning zone upstream combustion of boiler by the semicoke outlet of gas-solid separator, avoid on the one hand living beings directly to mix with coal dust and fire, thus avoid the Bunker blocking caused because directly mixing combustion, slagging scorification is easily caused to corrode and the mixed Utilizing question firing ash of impact, semicoke is reasonably used and processes on the other hand, improve the utilization rate of biomass energy.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present utility model, further feature of the present utility model and advantage thereof will become clear.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the principle schematic that the biomass fuel of the utility model one specific embodiment fires system again.
In Fig. 1, each Reference numeral represents respectively:
1, biomass silo;
2, living beings blanking pipe;
3, biomass pyrolysis furnace;
4, thermal decomposition product outlet conduit;
5, gas-solid separator;
6, deduster;
7, high-temperature blower;
8, gas transmission pipeline is fired again;
9, semicoke conveyance conduit;
10, fire air nozzle;
11, gas burner is fired again;
12, coal-char combustion device;
13, main burner;
14, burner hearth.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the utility model and application or use.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit scope of the present utility model.Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, technology, method and apparatus should be regarded as a part of authorizing description.In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
As shown in Figure 1, the biomass fuel of this embodiment again the system of firing comprise boiler body, biomass silo 1, living beings blanking pipe 2, biomass pyrolysis furnace 3, thermal decomposition product outlet conduit 4, gas-solid separator 5, deduster 6, high-temperature blower 7, fire gas transmission pipeline 8, semicoke conveyance conduit 9 again, fire gas burner 11, coal-char combustion device 12 and main burner 13 again.
Boiler body has burner hearth 14, burner hearth have set gradually from upstream to downstream primary zone, reducing zone, reburning zone and burning-out zone.Main burner 13, coal-char combustion device 12, fire gas burner 11 and fire air nozzle 10 is all arranged on boiler body again.Main burner 13 is divided into three layers to be arranged in primary zone, and main burner 13 is preferably low NO.Coal-char combustion device 12 is positioned at reducing zone.Fire gas burner 11 again and be positioned at reburning zone.Fire air nozzle 10 is positioned at burning-out zone.
Biomass silo 1 for receiving, storing living beings, and carries living beings to biomass pyrolysis furnace 3.The biomass outlet of biomass silo 1 is connected with the biomass inlet of biomass pyrolysis furnace 3 by living beings blanking pipe 2.
Biomass pyrolysis furnace 3 for carrying out pyrolysis to living beings, by biomass pyrolytic form biomass pyrolysis gas and semicoke.Gas-solid separator 5 is separated into pyrolysis gas of biomass and semicoke for the thermal decomposition product produced by biomass pyrolysis furnace 3.Gas-solid separator 5 can be such as cyclone separator.
The thermal decomposition product outlet of biomass pyrolysis furnace 3 is connected by thermal decomposition product outlet conduit 4 with the thermal decomposition product entrance of gas-solid separator 5.The gas vent of gas-solid separator 5 fires deduster 6 on gas transmission pipeline 8 and high-temperature blower 7 by firing gas transmission pipeline 8 more again with being arranged at and firing gas burner 11 again and be connected.The semicoke outlet of gas-solid separator 5 is connected by semicoke conveyance conduit 9 with coal-char combustion device 12.
This biomass fuel fires system again and the pyrolysis gas of biomass in the thermal decomposition product of biomass pyrolysis furnace is delivered to reburning zone as reburning fuel by the gas vent of gas-solid separator 5, semicoke in thermal decomposition product is delivered to upstream, reburning zone by the semicoke outlet of gas-solid separator 5 burn, avoid on the one hand living beings directly to mix with coal dust and fire, thus avoid the Bunker blocking caused because directly mixing combustion, slagging scorification and corrosion and impact is easily caused to mix the Utilizing question of combustion ash, semicoke is reasonably used and processes on the other hand, improve the utilization rate of biomass energy.
Deduster 6 is for removing solid particle remaining the pyrolysis gas of biomass that flows out from the gas vent of gas-solid separator 5.Deduster 6 can be such as cyclone dust collectors.The deduster entrance of deduster 6 is connected with the gas vent of gas-solid separator 5, the gas vent of deduster 6 by high-temperature blower 7 with fire gas burner 11 again and be connected.
Preferably, biomass fuel fires system again and also comprises plant ash ash bucket, and the solid outlet of deduster 6 is connected with the ash bucket entrance of plant ash ash bucket.More preferably, biomass fuel system of firing again also comprises plant ash delivery pump and plant ash ash silo, and the pump intake of plant ash delivery pump exports with the ash bucket of plant ash ash bucket and is connected, and the pump discharge of plant ash delivery pump is connected with the ash silo entrance of plant ash ash silo.
After the pyrolysis gas of biomass that biomass pyrolysis furnace 3 produces carries out dedusting by deduster 6, the plant ash collected is temporary in plant ash ash bucket and plant ash ash silo, can be used as fertilizer and takes out comprehensive utilization.
As shown in Figure 1, the fans entrance of high-temperature blower 7 is connected with the gas vent of deduster 6, the fan outlet of high-temperature blower 7 with fire gas burner 11 again and be connected.The reburning zone adopting high-temperature blower 7 pyrolysis gas of biomass directly to be accessed boiler can prevent the tar condensing in pyrolysis gas of biomass.
Preferably, biomass fuel system of firing again also comprises the heat exchanger (not shown) of the sensible heat of the pyrolysis gas of biomass of the gas vent for reclaiming gas-solid separator 5.
Biomass fuel system of firing again also comprises the pulverized coal preparation system for the manufacture of coal dust, and pulverized coal preparation system is connected with main burner 13.
The above biomass fuel again system of firing is the combustion technology of NOx in the pyrolysis gas of biomass drastic reduction stove that carries out on the basis of classifired combustion technology and low NO technology, do not affect original NOx reduction effect of classifired combustion, do not change the excess air coefficient proportioning of air staged combustion technology.This biomass fuel fires the primary zone that the main fuel coal of station boiler 85% ~ 95% is sent into burner hearth 14 by system again, under the excess air coefficient a in primary zone is the condition of 0.8 ~ 0.95, burning generates nitrogen oxide, the biomass fuel of all the other caloric values 5 ~ 15% is gasified by biomass pyrolysis furnace, the pyrolysis gas of biomass that biomass pyrolytic produces is transported in the reburning zone of burner hearth 14 and fires again, thus reduce NOx emission.Concrete implementation step is as follows:
Living beings in biomass silo 1 enter biomass pyrolysis furnace 3 through living beings blanking pipe 2, living beings carry out pyrolysis in biomass pyrolysis furnace 3, thermal decomposition product is transported to gas-solid separator 5 by thermal decomposition product outlet conduit 4, is separated and produces pyrolysis gas of biomass and semicoke in gas-solid separator 5.
Pyrolysis gas of biomass is delivered to as combustion gas body again fires the reburning zone that gas burner 11 sprays into burner hearth 14 after accelerating again, with NO, the NO in main flue gas by firing gas transmission pipeline 8 again
2carry out reduction reaction Deng pollutant, generate N
2, and form stronger reducing atmosphere in this region, effectively suppress the trend that NO intermediate product changes to NO.Thus in stove integrated air staged combustion systems (fire air nozzle 10 and low NO) basis on, reach the object of drastic reduction NOx.
From gas-solid separator 5, the material such as isolated semicoke, carbon residue utilizes First air pneumatic convey to coal-char combustion device 12 to spray into the reducing zone of burner hearth 14 by semicoke conveyance conduit 9, has continued combustion process.
In order to ensure the stove combustion efficiency of combustion gas body on the basis of drastic reduction NOx, the burning-out zone above reburning zone arranges fire air nozzle 10, ensures imperfect combustion full combustion of gas again, improves boiler combustion efficiency.
Visible, the biomass fuel of the above embodiment of the utility model fires system again, utilize biomass pyrolysis furnace to row pyrolysis during living beings, after thermal decomposition product is separated by gas-solid separator 5, carry out burning with reducing NOx in reburning zone pyrolysis gas of biomass being sent into the burner hearth 14 of coal-burning boiler.Utilize pyrolysis gas of biomass and coal dust mixed combustion, compared with direct biomass burning material, be rich in H
2, CH
4low with content of ashes in the pyrolysis gas of biomass of the combustible species such as CO, sulfur content is extremely low, there is not desulphurization problem, is desirable reburning fuel, effectively can lower the discharge of nitrogen oxide.Due to alkali metal in pyrolysis gas of biomass and chlorinity lower, slagging scorification and etching problem can also be avoided.The pyrolysis gas of biomass of preparation is directly put into operation to spray into burner hearth 14 in pulverized-coal fired boiler by firing gas burner 11 again reburning zone in burn, burn from the reducing zone that the isolated semicoke of thermal decomposition product utilizes First air airflow feeding to spray into burner hearth 14 to main burner and the coal-char combustion device 12 fired again between gas burner simultaneously, continue combustion process, further enhancing reducing atmosphere, realizes the effect that the degree of depth reduces NOx.In addition, owing to adopting pyrolysis gas of biomass and semicoke to replace part coal, steam coal consumption can be reduced in the basis of effectively reducing the pollutant discharge amount that power plant's fossil fuel produces, obtain certain economic benefit.
The present embodiment also provides a kind of and comprises the boiler that aforesaid biomass fuel fires system again.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to detailed description of the invention of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (9)
1. a biomass fuel fires system again, it is characterized in that, comprise boiler body, biomass silo (1), biomass pyrolysis furnace (3), gas-solid separator (5), main burner (13), coal-char combustion device (12) and fire gas burner (11) again, described boiler body has burner hearth (14), described burner hearth (14) has the primary zone set gradually to downstream from upstream, reburning zone and burning-out zone, described main burner (13), described coal-char combustion device (12) and the described gas burner that fires again are all arranged on described boiler body, described main burner (13) is positioned at described primary zone, the described gas burner (11) that fires again is positioned at described reburning zone, described coal-char combustion device (12) is positioned at the upstream of described reburning zone, the biomass outlet of described biomass silo (1) is connected with the biomass inlet of described biomass pyrolysis furnace (3), the thermal decomposition product outlet of described biomass pyrolysis furnace (3) is connected with the thermal decomposition product entrance of described gas-solid separator (5), the gas vent of described gas-solid separator (5) is connected with the described gas burner (11) that fires again, the semicoke outlet of described gas-solid separator (5) is connected with described coal-char combustion device (12).
2. biomass fuel according to claim 1 fires system again, it is characterized in that, described biomass fuel system of firing again also comprises deduster (6), the deduster entrance of described deduster (6) is connected with the gas vent of described gas-solid separator (5), and the gas vent of described deduster (6) is connected with the described gas burner (11) that fires again.
3. biomass fuel according to claim 1 and 2 fires system again, it is characterized in that, described biomass fuel system of firing again also comprises high-temperature blower (7), the fans entrance of described high-temperature blower (7) is connected with the gas vent of described gas-solid separator (5), and the fan outlet of described high-temperature blower (7) is connected with the described gas burner (11) that fires again.
4. biomass fuel according to claim 2 fires system again, it is characterized in that, described biomass fuel fires system again and also comprises plant ash ash bucket, and the solid outlet of described deduster (6) is connected with the ash bucket entrance of described plant ash ash bucket.
5. biomass fuel according to claim 4 fires system again, it is characterized in that, described biomass fuel system of firing again also comprises plant ash delivery pump and plant ash ash silo, the pump intake of described plant ash delivery pump exports with the ash bucket of described plant ash ash bucket and is connected, and the pump discharge of described plant ash delivery pump is connected with the ash silo entrance of described plant ash ash silo.
6. biomass fuel according to claim 1 fires system again, it is characterized in that, described burner hearth (14) also comprises reducing zone, described reducing zone is positioned at the downstream in described primary zone and is positioned at the upstream of described reburning zone, and described coal-char combustion device (12) is positioned at described reducing zone.
7. biomass fuel according to claim 1 fires system again, it is characterized in that, described biomass fuel system of firing again also comprises fire air nozzle (10), and described fire air nozzle (10) to be arranged on described boiler body and to be positioned at described burning-out zone.
8. biomass fuel according to claim 1 fires system again, it is characterized in that, described biomass fuel system of firing again also comprises the heat exchanger of the sensible heat of the pyrolysis gas of biomass of the gas vent for reclaiming described gas-solid separator (5).
9. a boiler, comprises biomass fuel and fires system again, it is characterized in that, the described biomass fuel again system of firing is that biomass fuel according to any one of claim 1 to 8 fires system again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520285846.4U CN204611736U (en) | 2015-05-06 | 2015-05-06 | Biomass fuel fires system and boiler again |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520285846.4U CN204611736U (en) | 2015-05-06 | 2015-05-06 | Biomass fuel fires system and boiler again |
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| Publication Number | Publication Date |
|---|---|
| CN204611736U true CN204611736U (en) | 2015-09-02 |
Family
ID=53964295
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|---|---|---|---|
| CN201520285846.4U Active CN204611736U (en) | 2015-05-06 | 2015-05-06 | Biomass fuel fires system and boiler again |
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| Country | Link |
|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109990267A (en) * | 2019-04-09 | 2019-07-09 | 西安石油大学 | A kind of low NO mixing fired biomass suitable for low-volatility fuelxCombustion system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990267A (en) * | 2019-04-09 | 2019-07-09 | 西安石油大学 | A kind of low NO mixing fired biomass suitable for low-volatility fuelxCombustion system |
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