WO2013099208A1 - 複合施設における焼却炉の燃焼促進方法及び複合施設 - Google Patents
複合施設における焼却炉の燃焼促進方法及び複合施設 Download PDFInfo
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- WO2013099208A1 WO2013099208A1 PCT/JP2012/008253 JP2012008253W WO2013099208A1 WO 2013099208 A1 WO2013099208 A1 WO 2013099208A1 JP 2012008253 W JP2012008253 W JP 2012008253W WO 2013099208 A1 WO2013099208 A1 WO 2013099208A1
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- Prior art keywords
- combustion
- incinerator
- biogas
- exhaust gas
- gas
- Prior art date
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 278
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000007789 gas Substances 0.000 claims description 192
- 239000002699 waste material Substances 0.000 claims description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 21
- 230000001737 promoting effect Effects 0.000 claims description 19
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 15
- 239000002028 Biomass Substances 0.000 claims description 10
- 239000000567 combustion gas Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 26
- 229910002090 carbon oxide Inorganic materials 0.000 description 26
- 238000005192 partition Methods 0.000 description 10
- 238000011084 recovery Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000005855 radiation Effects 0.000 description 8
- 239000002918 waste heat Substances 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000014102 seafood Nutrition 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/008—Incineration of waste; Incinerator constructions; Details, accessories or control therefor adapted for burning two or more kinds, e.g. liquid and solid, of waste being fed through separate inlets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
- F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
- F23G5/165—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber arranged at a different level
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
- F23G2206/203—Waste heat recuperation using the heat in association with another installation with a power/heat generating installation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/50007—Co-combustion of two or more kinds of waste, separately fed into the furnace
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/50208—Biologic treatment before burning, e.g. biogas generation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Definitions
- the present invention relates to a combustion promotion method for an incinerator and a composite facility in a composite facility in which biogas generated in a fermenter for fermenting biomass is combusted in a combustor and the obtained combustion exhaust gas is blown into the incinerator.
- the waste heat discharged from the waste incinerator is recovered by providing a boiler that generates steam using the exhaust gas from the waste incinerator as a heat source. Then, there is a type in which the steam coming out of the steam drum of the boiler is superheated by a superheater, led to a steam turbine through a steam header, and a generator is operated to generate power.
- the exhaust gas from the incinerator contains corrosive components such as hydrogen chloride generated by the combustion of chlorine contained in the garbage, so the purpose is to prevent corrosion of the boiler superheater tube. Therefore, measures are taken to make the surface temperature of the superheater less than the allowable temperature.
- the temperature of the superheated steam can be raised without causing the problem of corrosion of the superheater, and the steam turbine can be operated with high power generation efficiency.
- the combustion gas of less corrosive biogas discharged from this independent superheater is blown into the secondary combustion chamber provided downstream of the primary combustion chamber where the incinerator stoker is located, and heat recovery is performed. Has been done.
- the waste incineration plant uses only the air that burns the unburned gas (secondary combustion air) and reburns the unburned exhaust gas that is emitted when the waste is burned.
- secondary combustion air alone causes deterioration of carbon monoxide (CO) concentration due to insufficient mixing with unburned exhaust gas, and local combustion due to high oxygen (O 2 ) concentration in the air.
- CO carbon monoxide
- O 2 oxygen
- NO x nitrogen oxide
- Nitrogen oxide (NO x ) concentration has been reduced by reducing carbon oxide (CO) concentration and suppressing local combustion due to low O 2 concentration.
- the composition of the recirculation gas is affected by the combustion state in the incinerator, and when the O 2 concentration is low, the above effect may not be obtained. Furthermore, when the recirculated gas is extracted from the middle of the exhaust gas treatment process, it is corrosive because complete exhaust gas treatment has not been performed, and when a gas leak occurs, the surrounding equipment is contaminated and the surrounding environment. There was a risk of deterioration.
- Patent Document 1 in the conventional method for increasing the temperature of steam, only the heat recovery is performed by blowing the combustion gas of less corrosive biogas discharged from the independent superheater into the secondary combustion chamber of the incinerator. However, the combustion state in the primary combustion chamber is not considered.
- the present invention has been made in order to solve the above-described problems.
- a biogas combustion exhaust gas input position By setting a biogas combustion exhaust gas input position to a combustion chamber provided with a stoker, CO generated during combustion of garbage is provided. and combustion that can suppress NO X are those becomes possible, together with the effective utilization of the biogas produced in the fermenter, by introducing the combustion exhaust gas of the biogas into the combustion chamber of the incinerator, to promote burning by performing slow combustion, and its object is to provide a combustion promoting method and complex of incinerator in complex capable of reducing the generation of CO and NO X.
- the slow combustion is to perform slow combustion without performing rapid combustion or local combustion.
- a combustion promoting method for an incinerator in a complex facility is a fermenter for fermenting biomass to produce biogas, a combustor for burning the biogas, and for incinerating waste.
- a method for promoting combustion of an incinerator in a complex facility comprising an incinerator, wherein the biogas generated in the fermenter is combusted in the combustor, and the combustion exhaust gas is provided with a stoker for the incinerator. It is characterized by blowing into the combustion chamber.
- the biogas generated in the fermenter is combusted in the combustor, and the combustion exhaust gas of the biogas generated by this combustion is provided with a stoker. Can be blown into the combustion chamber. Accordingly, the biogas generated in the fermenter can be effectively used, and combustion can be promoted by causing slow combustion in the combustion chamber. Thus, the slow combustion can be performed because the combustion exhaust gas has a lower oxygen concentration than air.
- the combustion exhaust gas of biogas can be used as a part of air for burning unburned gas in the combustion chamber.
- the biogas combustion exhaust gas has a higher oxygen concentration than the exhaust gas recirculation exhaust gas that returns the exhaust gas discharged from the incinerator to the incinerator, and the composition of the combustion exhaust gas is the combustion in the incinerator. Since the unaffected, waste and combustion of the unburnt gas is accelerated stably, by local combustion is suppressed, nO X is reduced and that the combustion exhaust gas is stirred and mixed, incomplete combustion Gas (CO) can be burned completely or close to it to reduce CO.
- CO incomplete combustion Gas
- biogas generated in the fermenter can be blown into the combustion chamber.
- the biogas when surplus biogas is generated in the fermenter, the biogas can be blown directly into the combustion chamber, and it becomes possible to appropriately maintain the combustion area of waste in the combustion chamber.
- the temperature in the furnace is increased by the combustion heat generated by the combustion of the biogas, and the heat recovery rate of the boiler can be improved.
- a plurality of gas supply ports are provided on a sidewall or a ceiling of the combustion chamber, or both, and a desired one of the plurality of gas supply ports is provided.
- Biogas combustion exhaust gas or biogas, or both gases can be blown into the combustion chamber from the gas supply port.
- a plurality of carbon monoxide concentration detectors for detecting a carbon monoxide concentration are provided on a sidewall or a ceiling of the combustion chamber or both, and Based on the measured carbon monoxide concentration detected by the carbon monoxide concentration detector, biogas combustion exhaust gas, or both biogas combustion exhaust gas and biogas are blown into a spatial position where the carbon monoxide concentration is high can do.
- the gas in the spatial position with a high carbon monoxide concentration can be agitated by the biogas combustion exhaust gas blown into the combustion chamber, or by both the biogas combustion exhaust gas and the biogas.
- slow combustion, and complete combustion or near combustion can be performed.
- the combustion temperature in a combustion chamber can be made uniform, the heat recovery rate in a boiler can be improved.
- the complex facility further includes a boiler that uses exhaust gas discharged from the incinerator, and steam generated by the boiler is discharged from the combustor.
- the superheated steam is heated by the biogas combustion exhaust gas to raise the temperature of the superheated steam, and the turbine is operated by this superheated steam.
- the steam generated by the boiler can be superheated by the biogas combustion exhaust gas discharged from the combustor to increase the temperature of the superheated steam, and the temperature of the steam in the boiler superheater is supplied to the turbine.
- the temperature can be kept lower than the temperature of the superheated steam. Accordingly, it is not necessary to excessively increase the steam temperature in the boiler superheater, and the life of the boiler superheater can be prolonged.
- the incinerator may be a parallel flow type incinerator.
- the parallel flow incinerator is characterized by a structure in which a partition wall enters the upper part of the stoker. Therefore, since combustion air or the like is blown from the partition wall into the combustion chamber, the biogas combustion exhaust gas can be blown into the center of the combustion chamber located far from the side wall and the ceiling.
- the complex facility according to the present invention is infused with a fermenter for fermenting biomass, a combustor for combusting biogas generated in the fermenter, and combustion exhaust gas of biogas discharged from the combustor
- a complex facility comprising a parallel flow incinerator, wherein biogas combustion exhaust gas is blown into a combustion chamber provided with a stoker for the incinerator.
- the biogas generated in the fermenter can be combusted in the combustor, and the combustion exhaust gas of the biogas generated by this combustion can be blown into the combustion chamber provided with the stoker. .
- generated with the fermenter can be aimed at.
- the incinerator is a parallel flow type, combustion exhaust gas and unburned gas can be flowed so that complete combustion or near-combustion can be performed at the most downstream side of the combustion chamber while slowly burning, and combustion exhaust gas is burned. It can stay in the room for an appropriate time.
- the parallel flow incinerator is characterized by a structure in which a partition wall enters the upper part of the stoker, and biogas combustion exhaust gas can be blown into the combustion chamber from this partition wall.
- the slow combustion can be performed because the combustion gas of biogas has a lower oxygen concentration than air.
- the biogas combustion exhaust gas has a higher oxygen concentration than the exhaust gas recirculation exhaust gas that returns the exhaust gas discharged from the incinerator to the incinerator. promotes the combustion of the gases, incomplete combustion gases (carbon monoxide) is performed complete combustion or near the combustion, it is possible to reduce the generation of CO and NO X.
- the temperature in the incinerator can be prevented from decreasing and combustion efficiency can be improved.
- FIG. 1 is a system diagram showing a complex facility in which a combustion promoting method for an incinerator according to an embodiment of the present invention is used.
- FIG. 2 is an enlarged view showing the incinerator and boiler shown in FIG.
- FIG. 3 is a block diagram showing a complex facility control circuit according to the embodiment.
- a complex facility 11 shown in FIG. 1 includes a fermenter 12 to which biomass or the like (for example, woody biomass, sewage sludge, seafood waste, etc.) is supplied by a supply mechanism (not shown).
- This fermenter 12 can be fermented by reacting the supplied biomass at an appropriate temperature and pressure.
- Biogas generated in the fermenter 12 is guided to the product gas pipe 13.
- the generated gas pipe 13 is branched on the downstream side.
- the first branch gas pipe 14 is connected to the gas inlet of the combustor 15, and the biogas generated in the fermenter 12 passes through the product gas pipe 13 and the first branch gas pipe 14 and is combusted. 15 gas inlets can be introduced.
- the other second branch gas pipe 16 is connected to the primary combustion chamber 18 of the incinerator 17, and the biogas generated in the fermenter 12 passes through the generated gas pipe 13 and the second branch gas pipe 16. It can be introduced into the second gas supply port 20 of the primary combustion chamber 18.
- the gas outlet of the combustor 15 is connected to the primary combustion chamber 18 of the incinerator 17 via the combustion exhaust pipe 22, and the biogas combustion exhaust gas generated in the combustor 15 passes through the combustion exhaust pipe 22.
- the gas can be introduced into the first gas supply port 19 of the primary combustion chamber 18 through the first gas supply port 19.
- the biogas combustion exhaust gas can be used as a part of air for burning the gasified unburned gas in the incinerator 17.
- the biogas combustion exhaust gas has a higher oxygen concentration (O 2 concentration) than the exhaust gas recirculation exhaust gas that returns the exhaust gas discharged from the incinerator 17 into the incinerator 17, and further, the composition of the combustion exhaust gas is not affected by the combustion in the incinerator 17, waste and combustion of the unburnt gas is accelerated stably, by local combustion is suppressed, nO X is reduced, the flue gas is mixed and stirred As a result, incomplete combustion gas (carbon monoxide: CO) can be burnt completely or close to it to reduce CO.
- O 2 concentration oxygen concentration
- the biogas combustion exhaust gas and air are mixed outside the primary combustion chamber 18 so as to reach about 200 to 300 ° C., and the mixed gas is mixed into the primary combustion chamber 18. You may make it blow from the post combustion stoker 31.
- the air is heated with biogas combustion exhaust gas outside the primary combustion chamber 18 to reach about 200 to 300 ° C., and the heated air is combusted after the primary combustion chamber 18. You may make it blow from the stalker 31.
- the incinerator 17 is a so-called stoker-type parallel flow incinerator, and is provided with a waste heat boiler 23, a turbine 24, and a generator 25 for generating power using waste heat of the incinerator 17.
- the incinerator 17 is provided with a hopper 27 to which waste (incinerated material) 26 such as garbage containing biomass is supplied.
- the hopper 27 is connected to the primary combustion chamber 18 through the chute 28, and the waste 26 supplied to the hopper 27 is sent to the primary combustion chamber 18 through the chute 28.
- the primary combustion chamber 18 is provided with a dry stoker 29, a combustion stoker 30, and a post-combustion stoker 31.
- Primary air is sent from below the respective stokers 29, 30, 31 and air (secondary air) for burning unburned gas from the ceiling 32 or the side wall 41 (see FIG. 2) of the primary combustion chamber 18 (see FIG. 2). Not shown) has been sent.
- the waste 26 in the primary combustion chamber 18 is first sent to a drying stoker 29, where it is dried and ignited by the primary air and the radiant heat of the primary combustion chamber 18.
- the ignited waste 26 is sent to the combustion stalker 30.
- combustible gas is generated from the ignited waste 26 by thermal decomposition. This combustible gas is sent to the gas layer above the primary combustion chamber 18 by primary air, and combusts with the secondary air in this gas layer.
- the waste material 26 is further heated by the heat radiation accompanying the combustion.
- a part of the ignited waste 26 is combusted by the combustion stoker 30, and the remaining unburned part is sent to the post-combustion stoker 31.
- the unburned waste 26 is burned in the post-combustion stoker 31, and the incinerated ash remaining after the combustion is discharged from the chute 33 (see FIG. 2) to the outside.
- the primary combustion chamber 18 is connected to a secondary combustion chamber 36 of a waste heat boiler 23 provided in the incinerator 17 as shown in FIG. From the primary combustion chamber 18 to the secondary combustion chamber 36.
- the combustion exhaust gas is recombusted in the secondary combustion chamber 36 and then recovered in the first radiation chamber 34, and further guided to the economizer 37 through the second radiation chamber 35 of the waste heat boiler 23. . Thereafter, after the detoxification process is performed in the exhaust gas treatment facility 38, the exhaust gas is discharged into the atmosphere through the induction fan 39 and the chimney 40.
- the primary combustion chamber 18 of the incinerator 17 has a floor portion for holding the waste 26 formed of the dry stoker 29, the combustion stoker 30 and the post-combustion stoker 31, and
- the side surface portion is formed by the side wall 41, and the upper wall portion is formed by the ceiling 32 and the partition wall 42.
- the unburned gas in the primary combustion chamber 18 flows in parallel with the direction in which the waste 26 moves on the three stokers 29-31. This is why this incinerator 17 is called a parallel flow incinerator.
- a plurality of water pipes are provided on the respective walls forming the first radiation chamber 34 and the second radiation chamber 35 of the waste heat boiler 23, and these water pipes are connected to the boiler drum 43. ing.
- the water sent from the boiler drum 43 flows, and the water in the water pipe collects the waste heat of the first or second radiation chamber 34 or 35 and a part thereof evaporates. It becomes brackish water and returned to the boiler drum 43. A part of the brackish water returning to the boiler drum 43 is vaporized to become steam.
- the steam is sent from the boiler drum 43 to the superheater 44 and is superheated.
- the economizer 37 is for preheating water supplied to the boiler drum 43.
- the steam thus heated to high temperature and pressure flows into the independent superheater 47 through the steam pipe 46, and is further heated to a high temperature by the independent superheater 47.
- the superheated steam that has reached a high temperature is sent to the turbine 24, and the generator 24 can be rotated by the turbine 24 to generate electric power.
- the independent superheater 47 is provided in the combustion exhaust gas pipe 22 at a position approaching the gas outlet of the combustor 15.
- the independent superheater 47 can superheat the steam flowing into the independent superheater 47 through the steam pipe 46 to a high temperature by the high-temperature combustion exhaust gas generated when the biogas is burned in the combustor 15. Is.
- the exhaust gas partially extracted from the exhaust gas treatment facility 38 can be introduced into the third gas supply port 21 of the primary combustion chamber 18 through the exhaust gas recirculation gas pipe 48. ing.
- the temperature T1 of the flue gas of the biogas in the combustor 15 shown in FIG. 1 is about 900 ° C.
- the outlet temperature T2 of the independent superheater 47 of this flue gas is 450 to 600 ° C.
- the independent superheat in the steam pipe 46 The temperature T3 of the superheated steam flowing into the vessel 47 is about 350 ° C. or higher
- the temperature T4 of the superheated steam flowing out from the independent superheater 47 in the steam pipe 46 is 400 ° C. or higher.
- the exhaust gas introduced into the third gas supply port 21 of the primary combustion chamber 18 through the exhaust gas recirculation gas pipe 48 has a temperature T5 of 150 to 200 ° C. and an O 2 concentration N5 of 5 to 10%. It is.
- the biogas combustion exhaust gas has a temperature T2 of 450 to 600 ° C. and an O 2 concentration N2 of 10 to 18%.
- first to third gas supply ports 19, 20, 21 shown in FIG. 1 are provided for each of the ceiling 32, the partition wall 42, and the side wall 41 of the primary combustion chamber 18.
- a first gas valve 49 is provided in each of a plurality of combustion exhaust pipes 22 (gas pipes through which biogas combustion exhaust gas passes) connected to the plurality of first gas supply ports 19.
- each of a plurality of second branch gas pipes 16 (gas pipes through which biogas passes) connected to the plurality of second gas supply ports 20 is provided with a second gas valve 50, and a plurality of third gases.
- a third gas valve 51 is provided in each of the plurality of exhaust gas recirculation gas pipes 48 connected to the supply port portion 21. In each figure, however, each of the gas pipes 22, 16, 48 and the first to third gas valves 49 to 51 are shown one by one.
- first to third gas valves 49 to 51 among the plurality of first to third gas valves 49 to 51, a ceiling 32 and a partition wall 42 of the primary combustion chamber 18 are opened.
- the desired one or more kinds of gases can be blown into the primary combustion chamber 18 from the desired first to third gas supply ports 19, 20, 21 provided on the side wall 41.
- the first to third gas valves 49 to 51 provided in plurality are controlled to be opened and closed by a control unit 52 (central processing unit) shown in FIG. 3 according to a program stored in a storage unit (not shown). It is comprised so that.
- each of the ceiling 32, the partition wall 42, and the side wall 41 of the primary combustion chamber 18 shown in FIG. 1 is provided with a plurality of CO concentration detectors 53 for detecting the CO concentration. .
- the first to third gas valves 49 to 51 are configured to be opened and closed by the control unit 52 shown in FIG. 3 so that the above kinds of gases can be blown at a desired flow rate.
- a plurality of CO concentration detectors 53 are provided from the incinerator 17 to the boiler 23 inlet so that the entire CO concentration distribution in the incinerator 17 and the boiler 23 can be detected.
- the entire CO concentration distribution in the incinerator 17 and the boiler 23 is understood.
- the biogas generated in the fermenter 12 is burned in the combustor 15 and is generated by this combustion.
- the biogas combustion exhaust gas or the biogas combustion exhaust gas and biogas can be blown into the primary combustion chamber 18 in which the dry stoker 29, the combustion stoker 30 and the post combustion stoker 31 are provided. Thereby, the effective utilization of the biogas produced
- the biogas combustion exhaust gas is not affected by the combustion state in the incinerator 17 and is not corrosive and stable at a low O 2 concentration. Therefore, the biogas combustion exhaust gas is primarily combusted. By putting it in the chamber 18, it is possible to stabilize the combustion in the primary combustion chamber 18.
- this incinerator 17 is a parallel flow type, each combustion exhaust gas of biogas and waste 26 is made to flow to the position of the downstream combustion stoker 31 of the three downstream stokers 29 to 31 of the primary combustion chamber 18.
- the unburned gas can be retained in the primary combustion chamber 18 for an appropriate time.
- the parallel flow incinerator 17 is characterized by a structure in which the partition wall 42 enters the upper part of the stoker 31, and can burn biogas combustion exhaust gas into the center of the primary combustion chamber 18.
- combustion can be promoted by causing slow combustion in the primary combustion chamber 18.
- the slow combustion can be performed because the O 2 concentration N2 (10 to 18%) of the biogas combustion exhaust gas is lower than the O 2 concentration (21%) of air. ing.
- the waste 26 and unburned promotes the combustion of the gas, it is possible to reduce the CO and NO X incomplete combustion gas (CO) is performed complete combustion or combustion close to.
- the temperature T2 (450 to 600 ° C.) of the biogas combustion exhaust gas is high, it is possible to prevent the temperature in the incinerator 17 from being lowered and to improve the combustion efficiency.
- the heat of the high-temperature exhaust gas discharged from the incinerator 17 can be used in the boiler 23.
- the hot combustion exhaust gas of biogas is blown into the primary combustion chamber 18 and the gas in the primary combustion chamber 18 is agitated, a decrease in the temperature in the primary combustion chamber 18 is prevented, and the boiler 23 The heat recovery rate can be improved.
- the steam generated by the boiler 23 can be passed through an independent superheater 47 and superheated by the combustion exhaust gas of biomass discharged from the combustor 15 to increase the temperature of the superheated steam. Therefore, the temperature T3 (about 350 ° C. or higher) of the steam in the superheater 44 of the boiler 23 can be kept lower than the temperature T4 (about 400 ° C. or higher) of the superheated steam supplied to the turbine 24. Thereby, high temperature corrosion of the superheater 44 of the boiler 23 can be avoided, and the life of the superheater tube of the boiler 23 can be prolonged.
- the combustion in the primary combustion chamber 18 is promoted, and the heat of the exhaust gas discharged from the incinerator 17 in which CO reduction is achieved can be utilized in the boiler 23.
- the heat recovery rate is improved.
- the biogas is blown into the primary combustion chamber 18 through the product gas pipe 13 and the second branch gas pipe 16, but the biogas is injected into the primary combustion chamber 18. You may make it not blow.
- the exhaust gas recirculation gas is blown into the primary combustion chamber 18 through the exhaust gas recirculation gas pipe 48, but the exhaust gas recirculation gas is blown into the primary combustion chamber 18. It may not be possible.
- the method for promoting combustion of an incinerator in a complex facility according to the present invention and the complex facility are intended to effectively use biogas generated in a fermenter and in a combustion chamber in which a stoker for an incinerator is provided. to promote burning by performing slow combustion, it has an excellent effect capable of reducing the generation of CO and NO X, suitable for application to promote combustion method and complex of incinerator in such complex ing.
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Abstract
Description
12 発酵槽
13 生成ガス管
14 第1分岐ガス管
15 燃焼器
16 第2分岐ガス管
17 焼却炉
18 一次燃焼室
19 第1ガス供給口
20 第2ガス供給口
21 第3ガス供給口
22 燃焼排ガス管
23 ボイラ
24 タービン
25 発電機
26 廃棄物
27 ホッパ
28、33 シュート
29 乾燥ストーカ
30 燃焼ストーカ
31 後燃焼ストーカ
32 天井
34 第1放射室
35 第2放射室
36 二次燃焼室
37 エコノマイザー
38 排ガス処理設備
39 誘引送風機
40 煙突
41 側壁
42 仕切り壁
43 ボイラドラム
44 ボイラの過熱器
46 蒸気管
47 独立過熱器
48 排ガス再循環ガス管
49 第1ガス弁
50 第2ガス弁
51 第3ガス弁
52 制御部
53 一酸化炭素濃度検出器
Claims (8)
- バイオマスを発酵させてバイオガスを生成するための発酵槽と、
前記バイオガスを燃焼させるための燃焼器と、
廃棄物を焼却するための焼却炉とを備える複合施設における焼却炉の燃焼促進方法であって、
前記発酵槽で生成されたバイオガスを前記燃焼器で燃焼させ、
その燃焼排ガスを、前記焼却炉のストーカが設けられている燃焼室に吹き込むことを特徴とする複合施設における焼却炉の燃焼促進方法。 - バイオガスの燃焼排ガスを、前記燃焼室内の未燃ガスを燃焼させる空気の一部として使用することを特徴とする請求項1記載の複合施設における焼却炉の燃焼促進方法。
- 前記発酵槽で生成されたバイオガスを前記燃焼室に吹き込むことを特徴とする請求項2記載の複合施設における焼却炉の燃焼促進方法。
- 前記燃焼室の側壁若しくは天井、又はその両方には、複数のガス供給口部が設けられ、これら複数のガス供給口部のうち所望の前記ガス供給口部からバイオガスの燃焼排ガス若しくはバイオガス、又は両方のガスを、前記燃焼室内に吹き込むことができるようにしたことを特徴とする請求項1乃至3のいずれかに記載の複合施設における焼却炉の燃焼促進方法。
- 前記燃焼室の側壁若しくは天井、又はその両方には、一酸化炭素濃度を検出する複数の一酸化炭素濃度検出器が設けられ、これら複数の一酸化炭素濃度検出器で検出された測定一酸化炭素濃度に基づいて、一酸化炭素濃度の高い空間位置にバイオガスの燃焼排ガス、又はバイオガスの燃焼排ガス及びバイオガスの両方を吹き込むことを特徴とする請求項4記載の複合施設における焼却炉の燃焼促進方法。
- 前記複合施設は、前記焼却炉から排出される排ガスを利用するボイラを更に備え、
前記ボイラが発生する蒸気を、前記燃焼器から排出されるバイオガスの燃焼排ガスによって過熱して過熱蒸気を高温化し、この過熱蒸気によってタービンを作動させることを特徴とする請求項1乃至5のいずれかに記載の複合施設における焼却炉の燃焼促進方法。 - 前記焼却炉が並行流型焼却炉であることを特徴とする請求項1乃至6のいずれかに記載の複合施設における焼却炉の燃焼促進方法。
- バイオマスを発酵させるための発酵槽と、
発酵槽で生成されたバイオガスを燃焼させるための燃焼器と、
この燃焼器から排出されるバイオガスの燃焼排ガスが吹き込まれる並行流型焼却炉とを備える複合施設であって、
バイオガスの燃焼排ガスを、前記焼却炉のストーカが設けられている燃焼室に吹き込むことを特徴とする複合施設。
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JP5473098B1 (ja) * | 2013-06-06 | 2014-04-16 | 株式会社タクマ | ストーカ式焼却炉 |
JP2015068517A (ja) * | 2013-09-27 | 2015-04-13 | 日立造船株式会社 | 焼却炉における燃焼運転方法および焼却炉 |
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JP2016182561A (ja) * | 2015-03-26 | 2016-10-20 | Jfeエンジニアリング株式会社 | 焼却灰処理装置、廃棄物焼却装置、焼却灰処理方法及び廃棄物焼却方法 |
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JP6413034B1 (ja) * | 2018-01-15 | 2018-10-24 | 株式会社タクマ | バイオガス燃焼機関を併設した焼却炉の燃焼制御方法 |
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JP2022111792A (ja) * | 2021-01-20 | 2022-08-01 | 株式会社フジタ | 熱回収システム及び熱回収方法 |
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