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US20100050516A1 - Fuel gasification system - Google Patents

Fuel gasification system Download PDF

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Publication number
US20100050516A1
US20100050516A1 US12/527,432 US52743207A US2010050516A1 US 20100050516 A1 US20100050516 A1 US 20100050516A1 US 52743207 A US52743207 A US 52743207A US 2010050516 A1 US2010050516 A1 US 2010050516A1
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US
United States
Prior art keywords
gasification
fuel
passage
gas passage
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/527,432
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English (en)
Inventor
Takahiro Murakami
Koubun Kyo
Toshiyuki Suda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
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Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Assigned to IHI CORPORATION reassignment IHI CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURAKAMI, TAKAHIRO, SUDA, TOSHIYUKI, KYO, KOUBUN
Publication of US20100050516A1 publication Critical patent/US20100050516A1/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/82—Gas withdrawal means
    • C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/482—Gasifiers with stationary fluidised bed
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/485—Entrained flow gasifiers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
    • C10J3/56—Apparatus; Plants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/721—Multistage gasification, e.g. plural parallel or serial gasification stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0956—Air or oxygen enriched air
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0959—Oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0983—Additives
    • C10J2300/0993—Inert particles, e.g. as heat exchange medium in a fluidized or moving bed, heat carriers, sand
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water

Definitions

  • the present invention relates to a fuel gasification system.
  • a fuel gasification system has been developed to produce gasification gas, using coal, biomass, waste plastic, various wet wastes or the like as fuel.
  • tar is contained in gasification gas produced in a gasification furnace.
  • Especially heavy oil component of the tar is highly viscous and tends to attach to piping or the like, resulting disadvantageously in clogging of the piping or the like in a long-term operation.
  • FIG. 1 which comprises a gasification furnace 100 for partly oxidizing fuel such as coal, biomass, waste plastic or various wet wastes into gasification gas, a steam generator 101 for generating steam to be fed to the furnace 100 , a scrubber 102 for separating tar and the like from the gasification gas produced in the furnace 100 , an electric dust collector 103 for capturing particles and the like from the gasification gas having been free from the tar and the like in the scrubber 102 , an internal-combustion engine 104 such as gas engine or gas turbine driven by burning as fuel the gasification gas having been free from the particles and the like in the collector 103 , an electric generator 105 driven by the engine 104 , a thermal energy recovery device 106 comprising, for example, a heat exchanger for heat recovery of the gas discharged from the engine 104 , a flue 107 for discharging to atmosphere the exhaust gas having been heat-recovered in the recovery device 106
  • a thermal energy recovery device 106 comprising, for example, a heat exchanger for heat
  • the fuel such as coal, biomass, waste plastic or various wet wastes is partly oxidized in the gasification furnace 100 into gasification gas which is introduced into the scrubber 102 where water is sprayed to the gasification gas to separate tar and the like and condense steam in the gasification gas.
  • the gasification gas having been free from the tar and the like is introduced into the electric dust collector 103 where particles and the like in the gasification gas are captured.
  • the gasification gas having been free from the particles and the like is burned as fuel to drive the engine 104 to generate electricity in the electric generator 105 .
  • the exhaust gas from the engine 104 is heat-exchanged with air in the thermal energy recovery device 106 for heat recovery and is discharged to atmosphere through the flue 107 .
  • the tar having been separated from the gasification gas by spraying water in the scrubber 102 is separated from the water in the tar/water separator 108 .
  • the tar having been separated from the water in the separator 108 is recovered in the tar tank 109 and is burned in the combustion furnace 110 .
  • the water having been separated from the tar in the tar/water separator 108 is turned into steam in the steam generator 101 and is fed to the gasification furnace 100 together with the air heated in the thermal energy recovery device 106 .
  • the gasification furnace 100 may be followed by a reforming furnace to which oxygen is fed to partly burn the gasification gas for decomposition of the tar.
  • gasification furnace 100 is followed by the reforming furnace to which oxygen is fed for partial combustion of the gasification gas increases concentration of carbon dioxide, so that enhancement of gasification efficiency is still unhopeful.
  • the invention was made in view of the above and has its object to provide a fuel gasification system which can efficiently decompose tar and the like in gasification gas without use of water and the like, which can prevent tar from attaching to piping or the like, which enables a long-term operation and which can enhance gasification efficiency.
  • the invention is directed to a fuel gasification system comprising tar decomposing means for heating gasification gas produced in a gasification furnace to decompose tar in said gasification gas.
  • the tar decomposing means is constituted by a double-pipe heat exchanger which comprises coaxially arranged inner and outer pipes, exhaust gas from a combustion furnace and separated in a material separator being introduced into an exhaust gas passage in the inner pipe while gasification gas is introduced into a gasification passage between the inner and outer pipes and is heated by the exhaust gas from the combustion furnace.
  • the tar decomposing means may be constituted by a double-pipe heat exchanger which comprises coaxially arranged inner and outer pipes, gasification gas being introduced into a gasification gas passage in the inner pipe while the exhaust gas from the combustion furnace and separated in a material separator is introduced in an exhaust gas passage between the inner and outer pipes, said gasification gas being heated by the exhaust gas from the combustion furnace.
  • additional heating means may be provided so as to elevate in temperature the exhaust gas introduced into the exhaust gas passage.
  • the invention is also directed to a fuel gasification system comprising
  • a gasification furnace which has a fluidized bed formed by fluidizing reactant gas to gasify charged fuel into gasification gas and flammable solid content
  • a combustion furnace into which the flammable solid content generated in the gasification furnace is introduced together with bed material and which has a fluidized bed formed by fluidizing reactant gas to burn the flammable solid content and
  • a material separator for separating bed material from the exhaust gas introduced from the combustion furnace to feed the separated bed material to said gasification furnace
  • said fuel gasification system comprising tar decomposing means for heating the gasification gas produced in the gasification furnace to decompose tar contained in the gasification gas.
  • the tar decomposing means may be constituted by a heat exchanger comprising an gasification gas passage formed on an inner surface of the combustion furnace, the gasification gas being introduced into the gasification gas passage and heated by heat of the combustion furnace.
  • the tar decomposing means may be constituted by a heat exchanger comprising an gasification gas passage formed on an outer surface of the combustion furnace, the gasification gas being introduced into the gasification gas passage and heated by heat of the combustion furnace.
  • the tar decomposing means may be constituted by a heat exchanger comprising a gasification gas passage formed on an outer surface of a downcorner for guiding bed material separated in a material separator to the gasification furnace, the gasification gas being introduced into the gasification gas passage and heated by heat of the downcorner.
  • an exhaust gas passage may be formed into which introduced is the exhaust gas from the combustion furnace and elevated in temperature by additional heating means
  • the gasification gas passage is a spiral passage.
  • a fuel gasification system of the invention can exhibit excellent effects and advantages that tar contained in gasification gas can be efficiently decomposed without use of water and the like, that the tar can be prevented from attaching to piping or the like, that a long-term operation can be conducted and that gasification efficiency can be enhanced.
  • FIG. 1 An overall schematic view showing a conventional fuel gasification system.
  • FIG. 2 An overall schematic view showing a first embodiment of the invention.
  • FIG. 3 An overall schematic view showing a second embodiment of the invention.
  • FIG. 4 An overall schematic view showing a third embodiment of the invention.
  • FIG. 5 An overall schematic view showing a fourth embodiment of the invention.
  • FIG. 2 shows a first embodiment a fuel gasification system according to the invention which comprises a gasification furnace 2 with a fluidized bed 1 formed therein through steam and fluidizing reactant gas such as air or oxygen so as to gasify charged fuel such as coal, biomass, waste plastic or various wet wastes into gasification gas and flammable solid content; a combustion furnace 5 into which the flammable solid content produced in the gasification furnace 2 is introduced via an introduction pipe 3 together with bed material and in which a fluidized bed 4 is formed by the fluidizing reactant gas to burn the flammable solid content; and a material separator 8 such as hot cyclone into which the exhaust gas is introduced from the combustion furnace 5 via an exhaust gas pipe 6 to be separated from the bed material which in turn is fed via a downcorner 7 into the gasification furnace 2 , the fuel gasification system being provided with tar decomposing means 9 which heats the gasification gas produced in the gasification furnace 2 to decompose tar contained in the gasification gas.
  • reactant gas such as air or oxygen
  • the tar decomposing means 9 is constituted by a double-pipe heat exchanger 14 comprising vertically extending and coaxially arranged inner and outer pipes 10 and 11 , the exhaust gas from the combustion furnace 5 and separated in the separator 8 being introduced into an exhaust gas passage 12 in the inner pipe 10 while the gasification gas produced in the gasification furnace 2 and separated from bed material in the separator 15 is introduced into a gasification gas passage 13 between the inner and outer pipes 10 and 11 so as to be heated by said exhaust gas from the combustion furnace 5 , the bed material separated from the gasification gas being returned to the gasification furnace 2 .
  • the gasification and exhaust gas passages may be formed in the pipe 10 and between the pipes 10 and 11 , respectively, the exhaust gas from the combustion furnace 5 and separated in the separator 8 being introduced into the passage between the pipes 10 and 11 while the gasification gas is introduced into the passage in the pipe 10 .
  • additional heating means 16 such as combustor for elevating in temperature the exhaust gas to be introduced into the passage 12 so as to heat the gasification gas, the gasification gas passage 13 being in the form of a spiral passage 13 a with heat storage material (not shown) so as to secure sufficient dwell time of the gasification gas in the double-pipe heat exchanger 14 while maintaining high temperature.
  • the outer pipe 11 of the heat exchanger 14 is formed at its bottom with an inspection window 17 for ascertaining attaching status of the tar in the passage 13 ; depending upon the attaching status ascertained through the window 17 , additional fuel may be fed to the additional heating means 16 so as to elevate in temperature the exhaust gas.
  • additional heating means 16 it is not necessary to provide the additional heating means 16 when the exhaust gas discharged from the combustion furnace 5 has satisfactorily high temperature; of course, it is not necessary to make the gasification gas passage in the form of the spiral passage 13 a when enough dwell time of the gasification gas can be secured in the heat exchanger 14 .
  • the gasification gas having been passed through the passage 13 in the heat exchanger 14 with the tar contained being decomposed is heat-exchanged with water and air or oxygen in the thermal energy recovery device 18 so that steam and fluidizing reactant gas such as air or oxygen is produced.
  • the steam produced is fed to a bottom of the gasification furnace 2 while the fluidizing reactant gas is fed to bottoms of the furnaces 2 and 5 so as to form the fluidized beds 1 and 4 , respectively.
  • the gasification gas heat-recovered in the recovery device 18 is burned in the internal-combustion engine 19 to drive the engine 19 for generation of electricity in the electric generator 20 .
  • the exhaust gas having driven the engine 19 is discharged through the flue 21 to atmosphere.
  • the gasification gas heat-recovered in the recovery device 18 may be fed to a gas-to-liquids device (not shown) so as to recover hydrogen, carbon monoxide, ethanol, DME (dimethyl ether) or the like.
  • the exhaust gas having been passed through the passage 12 in the heat exchanger 14 is further heat-recovered in a thermal energy recovery device 22 comprising a heat exchanger or the like and is discharged via the flue 21 to atmosphere.
  • the gasification furnace 2 when fuel such as coal, biomass, waste plastic or various wet wastes is charged into the fluidized bed 1 formed by the steam and the fluidizing reactant gas such as air or oxygen, the fuel is partly oxidized into gasification so that gasification gas and flammable solid content are produced.
  • the flammable solid content produced in the furnace 2 is introduced through the pipe 3 together with the bed material into the combustion furnace 5 where the fluidized bed 4 is formed by the fluidizing reactant gas, so that the flammable solid content is burned.
  • the exhaust gas from the combustion furnace 5 is introduced via the exhaust gas pipe 6 into the material separator 8 where the bed material is separated from the exhaust gas and is returned via the downcorner 7 to the gasification furnace 2 to be circulated.
  • the gasification gas produced in the gasification furnace 2 is separated from the bed material in the material separator 15 and is introduced into the passage 13 between the inner and outer pipes 10 and 11 of the double-pipe heat exchanger 14 constituting the tar decomposing means 9 ; the exhaust gas from the combustion furnace 5 and separated from the bed material in the material separator 8 is introduced into the passage 12 in the inner pipe 14 of the double-pipe heat exchanger 14 .
  • the gasification gas is heated by the exhaust gas flowing though the passage 12 while it is passed through the passage 13 , so that tar contained in the gasification gas is decomposed.
  • the attaching status of the tar in the passage 13 is ascertained through the inspection window 17 ; when the tar attaches, additional fuel is fed to the additional heating means 16 so as to increase in temperature the exhaust gas.
  • the exhaust gas from the combustion furnace 5 and separated in the separator 8 is introduced into the passage between the pipes 10 and 11 while the gasification gas is introduced into the passage in the pipe 10 .
  • the gasification gas having been passed through the passage 13 in the heat exchanger 14 with the tar contained being decomposed is heat-exchanged with water and air in the thermal energy recovery device 18 and is heat-recovered, and then is introduced into the internal-combustion engine 19 and is burned, so that the internal-combustion engine 19 is driven to produce electricity through the electric generator 20 .
  • the exhaust gas having driven the engine 19 is discharged through the flue 21 to atmosphere; the exhaust gas having been passed through the passage 12 in the heat exchanger 14 for heating of the gasification gas is further heat-recovered in the thermal energy recovery device 22 and is discharged through the flue 21 to atmosphere.
  • the steam produced in the recovery device 18 is fed to the bottom of the gasification furnace while the fluidizing reactant gas produced in the recovery device 18 is fed to the bottoms of the furnaces 2 and 5 for formation of the fluidized beds 1 and 4 , respectively.
  • tar contained in the gasification gas can be effectively decomposed without use of water or the like; tar can be prevented from attaching to the piping or the like; a long-term operation can be conducted; and gasification efficiency can be enhanced.
  • FIG. 3 shows a second embodiment of the invention in which parts identical with those shown in FIG. 2 are represented by the same reference characters, its fundamental structure being similar to that shown in FIG. 2 .
  • the present embodiment is characteristic as shown in FIG. 3 in that tar decomposing means 9 is constituted by a heat exchanger 23 which heats, by heat of a combustion furnace 5 , gasification gas introduced into a gasification gas passage 13 which in turn is formed on an inner surface of the furnace 5 .
  • the gasification gas passage 13 on the inner surface of the furnace 5 may be, as needs demand, in the form of spiral passage just like the embodiment of FIG. 2 so as to prolong the dwell time of the gasification gas in the heat exchanger 23 .
  • the gasification gas produced in a gasification furnace 2 and separated from the bed material in a material separator 15 is introduced into the gasification gas passage 13 of the heat exchanger 23 constituting the tar decomposing means 9 and is heated by the heat of the combustion furnace 5 while being passed through the passage 13 , whereby the tar contained in the gasification gas is decomposed.
  • FIG. 4 shows a third embodiment of the invention in which parts identical with those shown in FIG. 2 are presented by the same reference characters, its fundamental structure being similar to that shown in FIG. 2 .
  • the present embodiment is characteristic as shown in FIG. 4 in that tar decomposing means 9 is constituted by a heat exchanger 24 which heats, by heat of a combustion furnace 5 , gasification gas introduced into a gasification gas passage 13 which in turn is formed on an outer surface of the furnace 5 .
  • the gasification gas passage 13 formed on the outer surface of the furnace 5 is in the form of a spiral passage 13 a with heat storage material (not shown) so that high temperature can be retained while dwell time of the gasification gas in the heat exchanger 24 is secured.
  • An exhaust gas passage 12 is formed on an outer surface of the gasification gas passage 13 of the heat exchanger 24 so as to introduce exhaust gas from the combustion furnace 5 and elevated in temperature by the additional heating means 16 into the passage 12 .
  • the gasification gas passage 13 may not necessarily be in the form of spiral passage 13 a; when the exhaust gas discharged from the combustion furnace 5 has sufficiently high temperature, the additional heating means 16 may not be necessarily provided.
  • the gasification gas produced in the gasification furnace 2 and separated from the bed material in the separator 15 is introduced into the gasification gas passage 13 of the heat exchanger 24 constituting the tar decomposing means 9 , the exhaust gas from the combustion furnace 5 and separated from the bed material in the separator 8 being introduced into the passage 12 of the heat exchanger 24 ; the gasification gas is heated by heat transmitted from the combustion furnace 5 and by the exhaust gas flowing through the passage 12 while the gasification gas is passed through the passage 13 , whereby the tar contained in the gasification gas is decomposed.
  • FIG. 5 shows a fourth embodiment of the invention in which parts identical with those shown in FIG. 2 are represented by the same reference characters, its fundamental structure being similar to that shown in FIG. 2 .
  • the present embodiment is characteristic as shown in FIG. 5 in that tar decomposing means 9 is constituted by a heat exchanger 25 which heats, by heat of a downcorner 7 guiding the bed material separated in a material separator 8 to a gasification furnace 2 , gasification gas introduced into a gasification gas passage 13 formed on an outer surface of the downcorner 7 .
  • tar decomposing means 9 is constituted by a heat exchanger 25 which heats, by heat of a downcorner 7 guiding the bed material separated in a material separator 8 to a gasification furnace 2 , gasification gas introduced into a gasification gas passage 13 formed on an outer surface of the downcorner 7 .
  • the gasification gas passage 13 formed on the outer surface of the downcorner 7 is in the form of a spiral passage 13 a with heat storage material (not shown), so that high temperature can be retained while enough dwell time of the gasification gas in the heat exchanger 25 is ensured.
  • An exhaust gas passage 12 is formed on an outer surface of the gasification gas passage 13 of the heat exchanger 25 , exhaust gas from a combustion furnace 5 and elevated in temperature by additional heating means 16 being introduced into the passage 12 .
  • the gasification gas passage 13 may not necessarily be the spiral passage 13 a; when the exhaust gas from the combustion furnace 5 has sufficiently high temperature, the additional heating means 16 may not be necessarily provided.
  • the gasification gas produced in the gasification furnace 2 and separated from the bed material in the separator 15 is introduced into the gasification gas passage 13 of the heat exchanger 25 constituting the tar decomposing means 9 , the exhaust gas from the combustion furnace 5 and separated from the bed material in the separator 8 being introduced into the passage 12 of the heat exchanger 25 .
  • the gasification gas is heated by the heat transmitted from the downcorner 7 and by the exhaust gas flowing through the passage 12 while the gasification gas is passed through the passage 13 , whereby the tar contained in the gasification gas is decomposed.
  • tar contained in the gasification gas can be efficiently decomposed without use of water or the like; tar can be prevented from attaching to the piping or the like; a long-term operation can be conducted; and gasification efficiency can be enhanced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Industrial Gases (AREA)
  • Processing Of Solid Wastes (AREA)
  • Gasification And Melting Of Waste (AREA)
US12/527,432 2007-02-22 2007-02-22 Fuel gasification system Abandoned US20100050516A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2007/000113 WO2008102414A1 (fr) 2007-02-22 2007-02-22 Équipement de gazéification de combustible

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/000113 A-371-Of-International WO2008102414A1 (fr) 2007-02-22 2007-02-22 Équipement de gazéification de combustible

Related Child Applications (1)

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US13/683,265 Division US8747501B2 (en) 2007-02-22 2012-11-21 Fuel gasification system

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US20100050516A1 true US20100050516A1 (en) 2010-03-04

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Family Applications (3)

Application Number Title Priority Date Filing Date
US12/527,432 Abandoned US20100050516A1 (en) 2007-02-22 2007-02-22 Fuel gasification system
US13/683,265 Active US8747501B2 (en) 2007-02-22 2012-11-21 Fuel gasification system
US14/247,892 Expired - Fee Related US9523053B2 (en) 2007-02-22 2014-04-08 Fuel gasification system including a tar decomposer

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US13/683,265 Active US8747501B2 (en) 2007-02-22 2012-11-21 Fuel gasification system
US14/247,892 Expired - Fee Related US9523053B2 (en) 2007-02-22 2014-04-08 Fuel gasification system including a tar decomposer

Country Status (6)

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US (3) US20100050516A1 (fr)
CN (1) CN101611123B (fr)
AR (1) AR065427A1 (fr)
AU (1) AU2007347600B2 (fr)
DE (1) DE112007003336B4 (fr)
WO (1) WO2008102414A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140091260A1 (en) * 2011-06-22 2014-04-03 Masahiro Narukawa Circulating fluidized bed-type gasification furnace and fluid medium flow rate control method
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US8747501B2 (en) 2014-06-10
US20130078158A1 (en) 2013-03-28
DE112007003336T5 (de) 2009-12-24
AR065427A1 (es) 2009-06-10
US9523053B2 (en) 2016-12-20
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WO2008102414A1 (fr) 2008-08-28
DE112007003336B4 (de) 2012-08-23

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