US20100050516A1 - Fuel gasification system - Google Patents
Fuel gasification system Download PDFInfo
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- 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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- gasification
- fuel
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- gas passage
- gas
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- 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
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- 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
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- 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
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- 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
Landscapes
- 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)
Abstract
A fuel gasification system including a gasification furnace including a fluidized bed formed by fluidizing reactant gas for gasifying fuel charged into gasification gas and flammable solid content, a combustion furnace for combustion of the flammable solid content into which the flammable solid content produced in the furnace is introduced together with bed material and that includes a fluidized bed formed by fluidizing reactant gas, a material separator such as hot cyclone that separates bed material from exhaust gas introduced from the combustion furnace, the separated bed material being fed through a downcorner to the gasification furnace, and a tar decomposing mechanism that heats the gasification gas produced in the furnace to decompose tar contained in the gasification gas.
Description
- 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.
- In the fuel gasification system, 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.
- In order to overcome such disadvantage, there has been, for example, a fuel gasification system as shown in
FIG. 1 which comprises agasification furnace 100 for partly oxidizing fuel such as coal, biomass, waste plastic or various wet wastes into gasification gas, asteam generator 101 for generating steam to be fed to thefurnace 100, ascrubber 102 for separating tar and the like from the gasification gas produced in thefurnace 100, anelectric dust collector 103 for capturing particles and the like from the gasification gas having been free from the tar and the like in thescrubber 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 thecollector 103, anelectric generator 105 driven by theengine 104, a thermalenergy recovery device 106 comprising, for example, a heat exchanger for heat recovery of the gas discharged from theengine 104, aflue 107 for discharging to atmosphere the exhaust gas having been heat-recovered in therecovery device 106, a tar/water separator 108 for separating tar and water having been separated from the gasification gas in thescrubber 102, atar tank 109 for recovering the tar having been separated in theseparator 108 and acombustion furnace 110 for burning the tar recovered in thetank 109. - In the fuel gasification system shown in
FIG. 1 , the fuel such as coal, biomass, waste plastic or various wet wastes is partly oxidized in thegasification furnace 100 into gasification gas which is introduced into thescrubber 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 theelectric 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 theengine 104 to generate electricity in theelectric generator 105. The exhaust gas from theengine 104 is heat-exchanged with air in the thermalenergy recovery device 106 for heat recovery and is discharged to atmosphere through theflue 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 theseparator 108 is recovered in thetar tank 109 and is burned in thecombustion furnace 110. The water having been separated from the tar in the tar/water separator 108 is turned into steam in thesteam generator 101 and is fed to thegasification furnace 100 together with the air heated in the thermalenergy recovery device 106. - In the conventional fuel gasification system, 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. - State of the art technology of a fuel gasification system for partly oxidizing fuel such as coal through an oxidizing agent into gasification gas is shown, for example, in Reference 1.
- [Reference 1] JP 2000-355693A
- However, recovery of tar by the
scrubber 102 and tar/water separator 108 as mentioned above is costly in terms of wastewater treatment; moreover, feeding of the recovered tar to thecombustion furnace 110 for burning the same makes it difficult to enhance gasification efficiency. - The fact that the
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.
- In said fuel gasification system, it is effective that 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.
- In said fuel gasification system, alternatively, 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.
- In these cases, 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.
- In the fuel gasification system, 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.
- In the fuel gasification system, 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.
- In the fuel gasification system, 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.
- On an outer surface of the heat exchanger comprising the gasification gas passage formed on the outer surface of the combustion furnace or 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
- In the fuel gasification system, it is preferable that the gasification gas passage is a spiral passage.
- To arrange the gasification gas passage vertically is effective in terms of arrangement space.
- 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. -
- 1 fluidized bed
- 2 gasification furnace
- 3 introduction pipe
- 4 fluidized bed
- 5 combustion furnace
- 6 exhaust gas pipe
- 7 downcorner
- 8 material separator
- 9 tar decomposing means
- inner pipe
- outer pipe
- exhaust gas passage
- 13 gasification gas passage
- 13 a spiral passage
- 14 double-pipe heat exchanger
- 16 additional heating means
- 17 inspection window
- 23 heat exchanger
- 24 heat exchanger
- 25 heat exchanger
- Embodiments of the invention will be described in conjunction with the attached drawings.
-
FIG. 2 shows a first embodiment a fuel gasification system according to the invention which comprises agasification 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; acombustion furnace 5 into which the flammable solid content produced in thegasification furnace 2 is introduced via anintroduction 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 amaterial separator 8 such as hot cyclone into which the exhaust gas is introduced from thecombustion furnace 5 via anexhaust gas pipe 6 to be separated from the bed material which in turn is fed via adowncorner 7 into thegasification furnace 2, the fuel gasification system being provided with tar decomposing means 9 which heats the gasification gas produced in thegasification furnace 2 to decompose tar contained in the gasification gas. - In this embodiment, the tar decomposing means 9 is constituted by a double-
pipe heat exchanger 14 comprising vertically extending and coaxially arranged inner andouter pipes combustion furnace 5 and separated in theseparator 8 being introduced into anexhaust gas passage 12 in theinner pipe 10 while the gasification gas produced in thegasification furnace 2 and separated from bed material in theseparator 15 is introduced into agasification gas passage 13 between the inner andouter pipes combustion furnace 5, the bed material separated from the gasification gas being returned to thegasification furnace 2. Alternatively, the gasification and exhaust gas passages may be formed in thepipe 10 and between thepipes combustion furnace 5 and separated in theseparator 8 being introduced into the passage between thepipes pipe 10. - It has been generally known that, when tar is contained in gas, the tar will be decomposed providing that the gas is retained at about 800° C. (1073K) for 15 seconds or at about 1000° C. (1273K) for 5 seconds. In order to satisfy such provision, there may be provided, as needs demand, 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, thegasification gas passage 13 being in the form of aspiral 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. Theouter pipe 11 of theheat exchanger 14 is formed at its bottom with aninspection window 17 for ascertaining attaching status of the tar in thepassage 13; depending upon the attaching status ascertained through thewindow 17, additional fuel may be fed to the additional heating means 16 so as to elevate in temperature the exhaust gas. Of course, it is not necessary to provide the additional heating means 16 when the exhaust gas discharged from thecombustion furnace 5 has satisfactorily high temperature; of course, it is not necessary to make the gasification gas passage in the form of thespiral passage 13 a when enough dwell time of the gasification gas can be secured in theheat exchanger 14. - In the fuel gasification system shown in
FIG. 2 , the gasification gas having been passed through thepassage 13 in theheat exchanger 14 with the tar contained being decomposed is heat-exchanged with water and air or oxygen in the thermalenergy 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 thegasification furnace 2 while the fluidizing reactant gas is fed to bottoms of thefurnaces recovery device 18 is burned in the internal-combustion engine 19 to drive theengine 19 for generation of electricity in theelectric generator 20. The exhaust gas having driven theengine 19 is discharged through theflue 21 to atmosphere. In stead of feeding the gasification gas heat-recovered in therecovery device 18 to theengine 19, it 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 theheat exchanger 14 is further heat-recovered in a thermalenergy recovery device 22 comprising a heat exchanger or the like and is discharged via theflue 21 to atmosphere. - Next, mode of operation of the above embodiment will be described.
- In 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 thefurnace 2 is introduced through thepipe 3 together with the bed material into thecombustion 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 thecombustion furnace 5 is introduced via theexhaust gas pipe 6 into thematerial separator 8 where the bed material is separated from the exhaust gas and is returned via thedowncorner 7 to thegasification furnace 2 to be circulated. In thegasification furnace 2, high temperature is retained in the presence of the steam fed to the bottom of thefurnace 2 and moisture evaporating from the fuel itself, so that water gasification reaction (C+H2O=H2+CO) and/or hydrogen transfer reaction (CO+H2O=H2+CO2) occurs, resulting in production of flammable gasification gas such as H2 or CO. - The gasification gas produced in the
gasification furnace 2 is separated from the bed material in thematerial separator 15 and is introduced into thepassage 13 between the inner andouter pipes pipe heat exchanger 14 constituting the tar decomposing means 9; the exhaust gas from thecombustion furnace 5 and separated from the bed material in thematerial separator 8 is introduced into thepassage 12 in theinner pipe 14 of the double-pipe heat exchanger 14. The gasification gas is heated by the exhaust gas flowing though thepassage 12 while it is passed through thepassage 13, so that tar contained in the gasification gas is decomposed. The attaching status of the tar in thepassage 13 is ascertained through theinspection 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. In a case where the gasification and exhaust gas passages are formed in theinner pipe 10 and between thepipes combustion furnace 5 and separated in theseparator 8 is introduced into the passage between thepipes pipe 10. - The gasification gas having been passed through the
passage 13 in theheat exchanger 14 with the tar contained being decomposed is heat-exchanged with water and air in the thermalenergy 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 theelectric generator 20. The exhaust gas having driven theengine 19 is discharged through theflue 21 to atmosphere; the exhaust gas having been passed through thepassage 12 in theheat exchanger 14 for heating of the gasification gas is further heat-recovered in the thermalenergy recovery device 22 and is discharged through theflue 21 to atmosphere. The steam produced in therecovery device 18 is fed to the bottom of the gasification furnace while the fluidizing reactant gas produced in therecovery device 18 is fed to the bottoms of thefurnaces - As a result, in comparison with the conventional recovery of tar through the
scrubber 102 and tar/water separator 108 and feeding and burning of the recovered tar to and in thecombustion furnace 110, it is not costly in terms of wastewater treatment and gasification efficiency can be enhanced. Also in comparison with the conventional arrangement of the gasification furnace followed by the reforming furnace to which oxygen is fed to partially burn the gasification gas, the concentration of the carbon dioxide is not increased and enhancement of the gasification efficiency is hopeful. It is effective in terms of arrangement space that thegasification gas passage 13 of the tar decomposing means is vertically arranged. - Thus, 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 inFIG. 2 are represented by the same reference characters, its fundamental structure being similar to that shown inFIG. 2 . The present embodiment is characteristic as shown inFIG. 3 in that tar decomposing means 9 is constituted by aheat exchanger 23 which heats, by heat of acombustion furnace 5, gasification gas introduced into agasification gas passage 13 which in turn is formed on an inner surface of thefurnace 5. It goes without saying that thegasification gas passage 13 on the inner surface of thefurnace 5 may be, as needs demand, in the form of spiral passage just like the embodiment ofFIG. 2 so as to prolong the dwell time of the gasification gas in theheat exchanger 23. - In the embodiment shown in
FIG. 3 , the gasification gas produced in agasification furnace 2 and separated from the bed material in amaterial separator 15 is introduced into thegasification gas passage 13 of theheat exchanger 23 constituting the tar decomposing means 9 and is heated by the heat of thecombustion furnace 5 while being passed through thepassage 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 inFIG. 2 are presented by the same reference characters, its fundamental structure being similar to that shown inFIG. 2 . The present embodiment is characteristic as shown inFIG. 4 in that tar decomposing means 9 is constituted by aheat exchanger 24 which heats, by heat of acombustion furnace 5, gasification gas introduced into agasification gas passage 13 which in turn is formed on an outer surface of thefurnace 5. In the embodiment ofFIG. 4 , thegasification gas passage 13 formed on the outer surface of thefurnace 5 is in the form of aspiral passage 13 a with heat storage material (not shown) so that high temperature can be retained while dwell time of the gasification gas in theheat exchanger 24 is secured. Anexhaust gas passage 12 is formed on an outer surface of thegasification gas passage 13 of theheat exchanger 24 so as to introduce exhaust gas from thecombustion furnace 5 and elevated in temperature by the additional heating means 16 into thepassage 12. When enough dwell time of the gasification gas in theheat exchanger 24 can be ensured, thegasification gas passage 13 may not necessarily be in the form ofspiral passage 13 a; when the exhaust gas discharged from thecombustion furnace 5 has sufficiently high temperature, the additional heating means 16 may not be necessarily provided. - In the embodiment shown in
FIG. 4 , the gasification gas produced in thegasification furnace 2 and separated from the bed material in theseparator 15 is introduced into thegasification gas passage 13 of theheat exchanger 24 constituting the tar decomposing means 9, the exhaust gas from thecombustion furnace 5 and separated from the bed material in theseparator 8 being introduced into thepassage 12 of theheat exchanger 24; the gasification gas is heated by heat transmitted from thecombustion furnace 5 and by the exhaust gas flowing through thepassage 12 while the gasification gas is passed through thepassage 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 inFIG. 2 are represented by the same reference characters, its fundamental structure being similar to that shown inFIG. 2 . The present embodiment is characteristic as shown inFIG. 5 in that tar decomposing means 9 is constituted by aheat exchanger 25 which heats, by heat of adowncorner 7 guiding the bed material separated in amaterial separator 8 to agasification furnace 2, gasification gas introduced into agasification gas passage 13 formed on an outer surface of thedowncorner 7. In the embodiment ofFIG. 5 , thegasification gas passage 13 formed on the outer surface of thedowncorner 7 is in the form of aspiral 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 theheat exchanger 25 is ensured. Anexhaust gas passage 12 is formed on an outer surface of thegasification gas passage 13 of theheat exchanger 25, exhaust gas from acombustion furnace 5 and elevated in temperature by additional heating means 16 being introduced into thepassage 12. When enough dwell time of the gasification gas in theheat exchanger 25 can be ensured, thegasification gas passage 13 may not necessarily be thespiral passage 13 a; when the exhaust gas from thecombustion furnace 5 has sufficiently high temperature, the additional heating means 16 may not be necessarily provided. - In the embodiment shown in
FIG. 5 , the gasification gas produced in thegasification furnace 2 and separated from the bed material in theseparator 15 is introduced into thegasification gas passage 13 of theheat exchanger 25 constituting the tar decomposing means 9, the exhaust gas from thecombustion furnace 5 and separated from the bed material in theseparator 8 being introduced into thepassage 12 of theheat exchanger 25. The gasification gas is heated by the heat transmitted from thedowncorner 7 and by the exhaust gas flowing through thepassage 12 while the gasification gas is passed through thepassage 13, whereby the tar contained in the gasification gas is decomposed. - As a result, in comparison with conventional recovery of tar by the
scrubber 102 and tar/water separator 108 and feeding and burning of the recovered tar to and in thecombustion furnace 110, in the embodiments shown inFIGS. 3 , 4 and 5, it becomes not costly in terms of wastewater treatment and gasification efficiency can be enhanced just like the embodiment shown inFIG. 2 . Also in comparison with conventional arrangement of the gasification furnace followed by the reforming furnace to which oxygen is fed to partially burn the gasification gas, the concentration of carbon dioxide is not increased and enhancement of gasification efficiency is hopeful. - Thus, just like the embodiment shown in
FIG. 2 , also in the embodiment shown inFIGS. 3 , 4 and 5, 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. - It is to be understood that a fuel gasification system of the invention is not limited to the above embodiments and that various changes and modifications may be made without departing from the scope of the invention.
Claims (29)
1. A fuel gasification system comprising tar decomposing means for heating gasification gas produced in a gasification furnace to decompose tar contained in said gasification gas.
2. A fuel gasification system as claimed in claim 1 , wherein the tar decomposing means is constituted by a double-pipe heat exchanger comprising 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 gas passage between the inner and outer pipes and is heated by the exhaust gas from the combustion furnace.
3. A fuel gasification system as claimed in claim 1 , wherein the tar decomposing means is constituted by a double-pipe heat exchanger comprising coaxially arranged inner and outer pipes, gasification gas being introduced into a gasification gas passage in the inner pipe while exhaust gas from the combustion furnace and separated in a material separator is introduced into an exhaust gas passage between the inner and outer pipes, said gasification gas being heated by the exhaust gas from the combustion furnace.
4. A fuel gasification system as claimed in claim 2 , further comprising additional heating means for elevating in temperature the exhaust gas introduced into the exhaust gas passage.
5. A fuel gasification system as claimed in claim 3 , further comprising additional heating means for elevating in temperature the exhaust gas introduced into the exhaust gas passage.
6. 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.
7. A fuel gasification system as claimed in claim 6 , wherein the tar decomposing means is 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.
8. A fuel gasification system as claimed in claim 6 , wherein the tar decomposing means is constituted by a heat exchanger comprising a 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.
9. A fuel gasification system as claimed in claim 6 , wherein the tar decomposing means is 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.
10. A fuel gasification system as claimed in claim 8 , wherein, on an outer surface of the heat exchanger comprising the gasification gas passage, an exhaust gas passage is formed into which introduced is the exhaust gas from the combustion furnace and elevated in temperature by additional heating means.
11. A fuel gasification system as claimed in claim 9 , wherein, on an outer surface of the heat exchanger comprising the gasification gas passage, an exhaust gas passage is formed into which introduced is the exhaust gas from the combustion furnace and elevated in temperature by additional heating means.
12. A fuel gasification system as claimed in claim 2 , wherein the gasification gas passage is a spiral passage.
13. A fuel gasification system as claimed in claim 12 , wherein the gasification gas passage is arranged vertically.
14. A fuel gasification system as claimed in claim 3 , wherein the gasification gas passage is a spiral passage.
15. A fuel gasification system as claimed in claim 4 , wherein the gasification gas passage is a spiral passage.
16. A fuel gasification system as claimed in claim 5 , wherein the gasification gas passage is a spiral passage.
17. A fuel gasification system as claimed in claim 7 , wherein the gasification gas passage is a spiral passage.
18. A fuel gasification system as claimed in claim 8 , wherein the gasification gas passage is a spiral passage.
19. A fuel gasification system as claimed in claim 9 , wherein the gasification gas passage is a spiral passage.
20. A fuel gasification system as claimed in claim 10 , wherein the gasification gas passage is a spiral passage.
21. A fuel gasification system as claimed in claim 11 , wherein the gasification gas passage is a spiral passage.
22. A fuel gasification system as claimed in claim 14 , wherein the gasification gas passage is arranged vertically.
23. A fuel gasification system as claimed in claim 15 , wherein the gasification gas passage is arranged vertically.
24. A fuel gasification system as claimed in claim 16 , wherein the gasification gas passage is arranged vertically.
25. A fuel gasification system as claimed in claim 17 , wherein the gasification gas passage is arranged vertically.
26. A fuel gasification system as claimed in claim 18 , wherein the gasification gas passage is arranged vertically.
27. A fuel gasification system as claimed in claim 19 , wherein the gasification gas passage is arranged vertically.
28. A fuel gasification system as claimed in claim 20 , wherein the gasification gas passage is arranged vertically.
29. A fuel gasification system as claimed in claim 21 , wherein the gasification gas passage is arranged vertically.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2007/000113 WO2008102414A1 (en) | 2007-02-22 | 2007-02-22 | Fuel gasification equipment |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/000113 A-371-Of-International WO2008102414A1 (en) | 2007-02-22 | 2007-02-22 | Fuel gasification equipment |
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 |
Family
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Family Applications (3)
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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 Active 2027-09-28 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 Active 2027-09-28 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 (en) |
CN (1) | CN101611123B (en) |
AR (1) | AR065427A1 (en) |
AU (1) | AU2007347600B2 (en) |
DE (1) | DE112007003336B4 (en) |
WO (1) | WO2008102414A1 (en) |
Cited By (5)
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US20140091260A1 (en) * | 2011-06-22 | 2014-04-03 | Masahiro Narukawa | Circulating fluidized bed-type gasification furnace and fluid medium flow rate control method |
US20150267637A1 (en) * | 2011-12-19 | 2015-09-24 | Denso Corporation | Exhaust gas heat exchanging device |
US10286431B1 (en) * | 2016-03-25 | 2019-05-14 | Thermochem Recovery International, Inc. | Three-stage energy-integrated product gas generation method |
US10800655B2 (en) | 2011-09-27 | 2020-10-13 | Thermochem Recovery International, Inc. | Conditioned syngas composition, method of making same and method of processing same to produce fuels and/or fischer-tropsch products |
US11370982B2 (en) | 2016-08-30 | 2022-06-28 | Thermochem Recovery International, Inc. | Method of producing liquid fuel from carbonaceous feedstock through gasification and recycling of downstream products |
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JP4930732B2 (en) * | 2009-08-20 | 2012-05-16 | 株式会社Ihi | Circulating fluidized bed gasification method and apparatus |
WO2012129814A1 (en) * | 2011-04-01 | 2012-10-04 | 大连理工大学 | Method for preparation of active carbon by pyrolysis of organics |
JP2013189510A (en) | 2012-03-13 | 2013-09-26 | Ihi Corp | Circulation type gasification furnace |
JP6183019B2 (en) * | 2013-07-12 | 2017-08-23 | 株式会社Ihi | Gasification gas generation system and operation method of cyclone separator |
JP2015044933A (en) * | 2013-08-28 | 2015-03-12 | 株式会社Ihi | Gasification gas generation system |
GB2537589B (en) * | 2015-03-05 | 2018-05-16 | Standard Gas Ltd | Pyrolysis or gasification apparatus and method |
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- 2007-02-22 DE DE112007003336T patent/DE112007003336B4/en not_active Expired - Fee Related
- 2007-02-22 AU AU2007347600A patent/AU2007347600B2/en not_active Ceased
- 2007-02-22 WO PCT/JP2007/000113 patent/WO2008102414A1/en active Application Filing
- 2007-02-22 US US12/527,432 patent/US20100050516A1/en not_active Abandoned
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2008
- 2008-02-21 AR ARP080100722A patent/AR065427A1/en not_active Application Discontinuation
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2012
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Cited By (12)
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US20140091260A1 (en) * | 2011-06-22 | 2014-04-03 | Masahiro Narukawa | Circulating fluidized bed-type gasification furnace and fluid medium flow rate control method |
US9528053B2 (en) * | 2011-06-22 | 2016-12-27 | Ihi Corporation | Circulating fluidized bed-type gasification furnace and fluid medium flow rate control method |
US10800655B2 (en) | 2011-09-27 | 2020-10-13 | Thermochem Recovery International, Inc. | Conditioned syngas composition, method of making same and method of processing same to produce fuels and/or fischer-tropsch products |
US11186483B2 (en) | 2011-09-27 | 2021-11-30 | Thermochem Recovery International, Inc. | Method of producing sulfur-depleted syngas |
US11760631B2 (en) | 2011-09-27 | 2023-09-19 | Thermochem Recovery International, Inc. | Method of producing a cooled syngas of improved quality |
US20150267637A1 (en) * | 2011-12-19 | 2015-09-24 | Denso Corporation | Exhaust gas heat exchanging device |
US9581107B2 (en) * | 2011-12-19 | 2017-02-28 | Denso Corporation | Exhaust gas heat exchanging device |
US10286431B1 (en) * | 2016-03-25 | 2019-05-14 | Thermochem Recovery International, Inc. | Three-stage energy-integrated product gas generation method |
US10766059B2 (en) | 2016-03-25 | 2020-09-08 | Thermochem Recovery International, Inc. | System and method for recovering inert feedstock contaminants from municipal solid waste during gasification |
US10946423B2 (en) | 2016-03-25 | 2021-03-16 | Thermochem Recovery International, Inc. | Particulate classification vessel having gas distributor valve for recovering contaminants from bed material |
US11370982B2 (en) | 2016-08-30 | 2022-06-28 | Thermochem Recovery International, Inc. | Method of producing liquid fuel from carbonaceous feedstock through gasification and recycling of downstream products |
US11634650B2 (en) | 2016-08-30 | 2023-04-25 | Thermochem Recovery International, Inc. | Method of producing liquid fuel from carbonaceous feedstock through gasification and recycling of downstream products |
Also Published As
Publication number | Publication date |
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AU2007347600A1 (en) | 2008-08-28 |
US20130078158A1 (en) | 2013-03-28 |
CN101611123A (en) | 2009-12-23 |
DE112007003336T5 (en) | 2009-12-24 |
AU2007347600B2 (en) | 2010-08-26 |
US9523053B2 (en) | 2016-12-20 |
CN101611123B (en) | 2013-11-20 |
DE112007003336B4 (en) | 2012-08-23 |
AR065427A1 (en) | 2009-06-10 |
US8747501B2 (en) | 2014-06-10 |
US20140215922A1 (en) | 2014-08-07 |
WO2008102414A1 (en) | 2008-08-28 |
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