JP5256662B2 - Fluidized bed gasification method and equipment - Google Patents

Description

  The present invention relates to a fluidized bed gasification method and equipment for gasifying a raw material with a fluidized bed.

  As fluidized bed gasification equipment for gasifying raw materials such as coal, biomass and sludge, a fluidized bed is formed by introducing a high-temperature fluidized medium and raw materials into a fluidized bed gasification furnace and supplying a gasifying agent. The gasification of the raw material is performed, and the generated gasification gas is taken out to the outside. On the other hand, the char generated during gasification in the fluidized bed gasification furnace and the fluidized medium are supplied to the fluidized bed combustion furnace to fluidize the char. A fluidized bed gasification facility called a two-column system has already been proposed in which the fluidized medium is heated to separate the exhausted gas from the exhaust gas and introduced again into the fluidized bed gasification furnace ( (See Patent Document 1).

  4 and 5 schematically show a two-column fluidized bed gasification facility. Reference numeral 1 denotes a fluidized bed combustion furnace. The fluidized bed combustion furnace 1 introduces char and fluidized medium generated by gasification of the raw material 12 in the fluidized bed gasification furnace 2 from the lower part, and from the air pipe 3 to the wind box. The fluid medium is heated while the char is fluidized and combusted by being blown out through the air 4 or the like to rise and flow.

  A separator 7 made of a cyclone is connected to the upper part of the fluidized bed combustion furnace 1 through a transfer pipe 5, and the combustion gas 6 discharged from the upper part of the fluidized bed combustion furnace 1 is introduced into the separator 7 through the transfer pipe 5. The fluid medium and the exhaust gas are then centrifuged. The exhaust gas 8 containing ash with a fine particle size is discharged to the upper part of the separator 7, and the fluid medium 9 containing unburned char with a coarse particle size is connected to the lower end of the separator 7 and separated into the downcomer 10 to flow. It is introduced into the bed gasifier 2. Here, in FIG. 5, two separators 7, 7 ′ are connected to the fluidized bed combustion furnace 1, and the fluidized medium 9 separated by each separator 7, 7 ′ is separated by a separate downcomer 10. The fluidized bed gasification furnace 2 is introduced near the fluidized bed combustion furnace 1 and at the left and right corners (upper and lower corners in FIG. 5). At this time, when the combustion gas 6 of the fluidized bed combustion furnace 1 is guided to the separators 7 and 7 ′ by the transfer pipes 5 and 5 ′, particles such as a fluidized medium in the combustion gas 6 are transferred to the transfer pipes 5 and 5 ′. Due to the problem of clogging due to separation and deposition, the lengths of the transfer pipes 5 and 5 ′ are made as short as possible. For this reason, the separators 7 and 7 ′ are arranged close to the fluidized bed combustion furnace 1. Accordingly, the fluidized medium 9 is introduced into the fluidized bed gasification furnace 2 at a position close to the fluidized bed combustion furnace 1 by the downcomer 10.

The fluidized bed gasification furnace 2 is supplied with the heated fluidized medium 9 from the separators 7 and 7 ′ and supplied with a raw material 12 such as coal by a raw material supply device 11, and further fluidized bed gasification. A gasifying agent 13 such as water vapor is supplied from the lower part of the furnace 2 by a wind box 14 or the like, and the raw material 12 is gasified by a fluidized bed 15 formed by the gasifying agent 13. When gasification is performed by supplying a raw material 12 such as coal or biomass, a gasification gas 16 in which gas components such as hydrogen (H ₂ ), carbon monoxide (CO), and methane (CH ₄ ) are mixed is generated. .

  The gasification gas 16 generated by gasification in the fluidized bed gasification furnace 2 is taken out from the outlet 17 and pressurized to be supplied as fuel to, for example, a gas turbine or the like, or gasified by being supplied to a purification apparatus. The required product gas is produced from the gas 16.

The char and the fluidized medium that have not been gasified in the fluidized bed gasification furnace 2 are supplied again to the fluidized bed combustion furnace 1 through the supply flow path 18 composed of an overflow pipe or the like and circulate. Heated.
JP 2005-41959 A

  However, in the conventional fluidized bed gasification equipment, as shown in FIGS. 4 and 5, the fluidized medium 9 separated by the separators 7 and 7 ′ and introduced into the fluidized bed gasification furnace 2 is used as the fluidized bed. There was a problem that it was difficult to move the gasification furnace 2 so that it could travel all over the plane.

  That is, as shown in FIG. 5, the fluid medium 9 introduced from the separators 7 and 7 ′ into the fluidized bed gasification furnace 2 by the downcomer 10 has a shortest path 19 from the introduction position toward the supply passage 18. To move through. For this reason, a dead space portion 20 in which the movement of the fluidized medium stagnates is formed on the side farther from the downcomer pipe 10 in the fluidized bed gasification furnace 2 (the portion hatched on the right side in FIG. 5). The dead space portion 20 is not supplied with a new high-temperature fluid medium, and the raw material 12 is not easily moved, so that the temperature of the dead space portion 20 is lowered.

The present invention includes a fluidized bed combustion furnace that burns char to heat a fluidized medium;
A separator for separating the fluidized medium from the combustion gas derived from the fluidized bed combustion furnace;
A fluidized bed gasification furnace for introducing a fluidized medium separated by a separator through a downcomer and supplying a raw material and a gasifying agent to gasify the raw material by a fluidized bed;
A fluidized bed gasification method having a supply flow path for circulating a char generated when gasifying a raw material in a fluidized bed gasification furnace and a fluidized medium to the fluidized bed combustion furnace,
The fluidized bed gasifier is composed of multiple gasifiers,
A raw material that can be suitably gasified at a high temperature, and a raw material from which low melting point ash is produced at the time of gasification, provided with a temperature changing means that keeps the temperature of each gasifier at a gasification temperature suitable for the gasification of the raw material Are supplied to a gasifier maintained at the corresponding gasification temperature and gasified at the same time ,
The present invention relates to a fluidized bed gasification method characterized in that the gasification gas generated in each gasifier is separately taken out.

  On the other hand, the raw material is a gas that is suitably gasified at high temperatures to produce many gasification gases, such as coal and petroleum residues, and low melting point ash is generated during gasification, and this low melting point ash is gasified. There are some raw materials that are preferably gasified at a low temperature because they are taken out together with gas and adhere to pipes and equipment. Conventionally, such raw materials having different temperatures to be gasified are used in one fluidized bed. It was not possible to gasify at the same time in the gasification facility.

  The present invention has been made in view of the above-described conventional problems, and can be used to gasify a raw material with high gasification efficiency, and use a single fluidized bed gasification facility for raw materials having different temperatures to be gasified. It aims at providing the fluidized bed gasification method and equipment which enabled gasification.

The present invention includes a fluidized bed combustion furnace that burns char to heat a fluidized medium;
A separator for separating the fluidized medium from the combustion gas derived from the fluidized bed combustion furnace;
A fluidized bed gasification furnace for introducing a fluidized medium separated by a separator through a downcomer and supplying a raw material and a gasifying agent to gasify the raw material by a fluidized bed;
A fluidized bed gasification method having a supply flow path for circulating a char generated when gasifying a raw material in a fluidized bed gasification furnace and a fluidized medium to the fluidized bed combustion furnace,
The present invention relates to a fluidized bed gasification method characterized in that a fluidized bed gasification furnace is constituted by a plurality of gasifiers, and the gasification gas generated in each gasifier is separately taken out.

The present invention includes a fluidized bed combustion furnace that burns char to heat a fluidized medium;
A separator for separating the fluidized medium from the combustion gas derived from the fluidized bed combustion furnace;
A fluidized bed gasification furnace for introducing a fluidized medium separated by a separator through a downcomer and supplying a raw material and a gasifying agent to gasify the raw material by a fluidized bed;
A fluidized bed gasification facility having a supply flow path for circulating a char and a fluidized medium generated when gasifying a raw material in a fluidized bed gasification furnace to the fluidized bed combustion furnace,
Comprising a plurality of gasifiers that fluidize the fluid medium from the separator to gasify the raw material;
Equipped with temperature changing means adapted to maintain the temperature of each gasifier at a gasification temperature suitable for gasification of the raw material,
A raw material supply device that supplies a raw material that can be suitably gasified at a high temperature and a raw material from which low melting point ash is generated at the time of gasification to a gasifier that maintains the corresponding gasification temperature,
The present invention relates to a fluidized bed gasification facility characterized in that each gasifier is provided with an outlet for taking out gasified gas produced in each gasifier.

In the fluidized bed gasification facility, it is preferable that the plurality of gasifiers are arranged one above the other, and that the upper and lower gasifiers are arranged so that at least a part thereof is overlapped with each other when seen in a plan view .

  In the fluidized bed gasification facility, the temperature changing means may be a branching device that branches the fluidized medium separated by the separator and leads it to each gasifier.

  Further, in the fluidized bed gasification facility, the temperature changing means is a plurality of separators for separating the fluid medium from the combustion gas whose combustion gas intake amount is adjusted, and for guiding the separated fluid medium to each gasifier. Also good.

  In the fluidized bed gasification facility, the temperature changing means is configured such that each gasifier is connected in multiple stages in the vertical direction, and the fluidized medium of the upper gasifier flows down to the lower gasifier through the overflow pipe. The temperature of the lower gasifier may be lower than the temperature of the upper gasifier.

  According to the fluidized bed gasification method and facility of the present invention, the fluidized bed gasification furnace is constituted by a plurality of gasifiers, and the gasification gas is taken out from each gasifier. By increasing the volume, the fluidized medium moves to every corner of each gasifier, and the occurrence of dead space where the fluidized medium stagnates can be prevented, so that the volume of the gasifier is effectively increased. By being utilized, the gasification capacity of the fluidized bed gasification furnace is enhanced, and an excellent effect can be obtained that the throughput of raw materials and the generation amount of gasification gas can be significantly increased.

  Furthermore, by maintaining the temperature of each gasifier at a gasification temperature suitable for gasification of the raw material by the temperature changing means, a raw material that can be suitably gasified at a high temperature and a low melting point ash are generated during gasification. There is an effect that the raw material can be gasified simultaneously with one fluidized bed gasification facility.

  By arranging each gasifier vertically, there is an effect that the installation space of the fluidized bed gasifier can be greatly reduced.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows an example of an embodiment of the present invention, in which a fluidized bed combustion furnace 1 and a combustion gas 6 discharged from the fluidized bed combustion furnace 1 are introduced via a transfer pipe 35, and an exhaust gas 8 and a fluid medium. In a fluidized bed gasification facility including one separator 21 that separates the fluidized bed 9 from the fluidized bed gasification furnace 2, the fluidized bed gasification furnace 2 is constituted by a plurality of gasifiers 22a and 22b. Here, each gasifier 22a, 22b is used to gasify the raw material in one fluidized bed gasification furnace 2 in a state where the fluidized bed combustion furnace 1 and the fluidized bed gasification furnace 2 are in thermal balance. The required gasification volume is divided into a plurality of volumes. Although FIG. 1 shows the case where the fluidized bed gasification furnace 2 is constituted by two gasifiers 22a and 22b, it may be constituted by three or more gasifiers.

  The descending pipe 23 of the separator 21 is provided with a temperature changing means 25 comprising a branching device 24 for branching the fluidized medium 9, and the fluidizing medium 9 whose branching amount is adjusted by the branching device 24 is branched into the branching tubes 26a and 26b. Is supplied to the gasifiers 22a and 22b so that the gasifiers 22a and 22b can be maintained at a required temperature. Here, for example, when the supply amount of the fluidized medium 9 supplied to the gasifier 22a is increased by the branching device 24, the temperature of the gasifier 22a is increased, and the supply amount of the fluidized medium 9 supplied to the gasifier 22b is decreased. The temperature of the gasifier 22b is lowered.

  Each gasifier 22a, 22b is supplied with a gasifying agent 27 such as water vapor through a wind box 28 or the like to form a fluidized bed 29. Also, the raw material supply devices 30a, 30b supply raw materials 31a, 31b. In this way, the raw materials 31a and 31b are gasified in the gasifiers 22a and 22b. At this time, the raw materials 31a and 31b supplied to the gasifiers 22a and 22b by the raw material supply devices 30a and 30b may be the same raw material, or different raw materials are supplied to the gasifiers 22a and 22b. You may do it. Further, the same gasifying agent 27 may be used for each gasifier 22a, 22b, or different gasifying agents may be used.

  The gasified gases 32a and 32b generated by gasification in the gasifiers 22a and 22b are separately taken out from the outlets 33 provided in the gasifiers 22a and 22b. In addition, the char and the fluidized medium that have not been gasified by the gasifiers 22a and 22b are again supplied to the fluidized bed combustion furnace 1 through the supply passages 34a and 34b made of overflow pipes and circulated. ing.

  FIG. 2 shows another example of the temperature changing means 25. In this example, a plurality of separators 21a and 21b are connected to the fluidized bed combustion furnace 1 by transfer pipes 35a and 35b, and each separator 21a is connected. , 21b is introduced into the gasifiers 22a, 22b through the downcomers 36a, 36b. Each gasifier is provided with a temperature changing means 25 configured by installing a flow rate regulator 37 such as a damper in at least one of the transfer pipes 35a and 35b, or by setting a cross-sectional area of the transfer pipes 35a and 35b. By adjusting the flow rate of the fluid medium 9 supplied to 22a and 22b, the temperature of each gasifier 22a and 22b can be maintained at a predetermined temperature.

  Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.

  The fluidized bed gasification furnace 2 is composed of a plurality of gasifiers 22a and 22b, and the fluidized medium 9 is introduced into the gasifiers 22a and 22b via the downcomers 36a and 36b, and a gasifying agent 27 such as water vapor is used. When the raw materials 31a and 31b are supplied, the raw materials 31a and 31b are gasified by the fluidized bed 29, and the gasified gases 32a and 32b generated by the gasifiers 22a and 22b are taken out from the respective outlets 33.

  As described above, by providing the gasifiers 22a and 22b having a small volume obtained by dividing the gasification volume necessary for the gasification of the raw material by the fluidized bed gasifier 2, each gasifier 22a and 22b is provided with each gasifier. The introduced fluid medium 9 is moved to every corner of the gasifiers 22a and 22b, and it is possible to prevent a dead space portion where the fluid medium is stagnant. For this reason, the gasification capacity of the fluidized bed gasification furnace 2 is enhanced by effectively utilizing the volumes of the gasifiers 22a and 22b, so that the throughput of the raw materials 31a and 31b and the gasification gases 32a and 32b are increased. The amount of production can be increased.

  In addition, as described above, the gasifiers 22a and 22b formed in a small volume are arranged so as to be stacked one above the other so as to wrap each other in plan view as shown in FIGS. The installation space of the fluidized bed gasification furnace 2 can be reduced.

  Further, by adjusting the supply amount of the fluidized medium 9 supplied to each gasifier 22a, 22b by the temperature changing means 25 shown in FIGS. 1 and 2, the temperature of each gasifier 22a, 22b is adjusted. Different raw materials 31a and 31b can be supplied to the gasifiers 22a and 22b depending on the raw material supply devices 30a and 30b and simultaneously gasified. For example, in the gasifier 22a maintained at a temperature of 800 ° C. to 900 ° C., a high carbon content raw material such as coal, petroleum residue, etc., which is gasified satisfactorily at that temperature to produce a large amount of gasified gas 32a. On the other hand, the gasifier 22b supplied with 31a and maintained at a temperature of 600 ° C. to 700 ° C. has a low melting point ash produced at the temperature of 800 ° C. to 900 ° C., and biomass and soot. A fluidized bed gas comprising a raw material 31a that can be suitably gasified at a high temperature and a raw material 31b that produces low melting point ash upon gasification by supplying raw material 31b having a low carbon content such as rice straw and sewage sludge It can be gasified at the same time with a gasification facility.

  For example, when the raw material 31b having a low carbon content is gasified in the gasifier 22b maintained at 600 ° C. to 700 ° C., the problem of generating low melting point ash in the gasifier 22b is prevented. The problem of being taken out together with 32b and adhering to piping and equipment is avoided. On the other hand, the low melting point ash adheres to the fluidized medium and the char and is supplied to the fluidized bed combustion furnace 1. In the fluidized bed combustion furnace 1, for example, it burns at a high temperature of 1000 ° C. to 1100 ° C. Ashes become vapor and are discharged together with the exhaust gas 8.

  FIG. 3 shows another example of the embodiment of the present invention. In this example, the fluidized bed gasification furnace 2 is constituted by a plurality of gasifiers 22a, 22b, 22c, 22d, and each gasifier 22a, 22b, 22c and 22d are connected in multiple stages in series in the vertical direction by an overflow pipe 38. Each gasifier 22a, 22b, 22c, 22d is supplied with a gasifying agent 27 such as water vapor by a wind box 28 or the like to form a fluidized bed 29. The uppermost gasifier 22 a is supplied with the fluid medium 9 from the separator 21 and is supplied with the raw material 31 by the raw material supply device 30, and the supplied fluid medium 9 gets over the weir plate 39. By flowing into the lower gasifier 22b through the overflow pipe 38, the lower portion of the overflow pipe 38 is provided with the insertion plate 40 immersed in the fluidized bed 29 of the lower gasifier 22b. Is supplied to the lower gasifier 22b while maintaining a state in which the inside of the overflow pipe 38 is filled. The lower gasifiers 22c and 22d are configured in the same manner as the gasifier 22b.

  In FIG. 3, the raw material 31 a supplied to the uppermost gasifier 22 a is gasified by the action of the fluidizing medium 9 and the gasifying agent 27 introduced from the separator 21 through the downcomer 23, and generated gasified gas. 32a is taken out from the outlet 33 of the gasifier 22a, and the fluid medium and char get over the weir plate 39 and are supplied to the lower gasifier 22b through the overflow pipe 38. The gasified gas 32b generated by gasification is taken out from the outlet 33 of the gasifier 22b, and is thus sequentially sent to the lower stage for gasification, and is gasified by the lowermost gasifier 22d. The char and fluid medium that have not been supplied are supplied to the fluidized bed combustion furnace 1 through the supply flow path 34.

  In the above, the fluidized medium 9 introduced into the uppermost gasifier 22a is cooled by the raw material 31 supplied from the raw material supply device 30, and further receives external cooling while flowing down the overflow pipe 38. In addition, the temperature of the fluidized medium 9 decreases as it flows downward. In this way, the temperature changing means 25 is formed by lowering the temperature of the lower gasifier with respect to the temperature of the upper gasifier.

  According to the form of FIG. 3, each of the gasification devices 22a, 22b, 22c, and 22d having a small volume obtained by dividing the gasification volume required for gasification of the raw material by the fluidized bed gasification furnace 2 into a plurality is provided. The fluidized medium 9 introduced into the gasifiers 22a, 22b, 22c, and 22d is moved to every corner of the gasifiers 22a, 22b, 22c, and 22d, and a dead space portion where the fluidized medium is stagnated is generated. Can be prevented. For this reason, the gasification capacity of the fluidized bed gasification furnace 2 is enhanced by effectively utilizing the volumes of the gasifiers 22a, 22b, 22c, and 22d, so that the throughput of the raw material 31 and the gasification gas 32a, The generation amount of 32b, 32c, 32d can be increased.

  Further, since the plurality of gasifiers 22a, 22b, 22c, and 22d are connected in series in the vertical direction, the installation space of the fluidized bed gasification furnace 2 can be made extremely small.

  Furthermore, since the temperature change means 25 is formed by the temperature of the lower gasifier being lower than the temperature of the upper gasifier, the temperature of the fluidizer 9 from the separator 21 is, for example, 800 ° C. to 900 ° C. For the uppermost gasifier 22a maintained at a temperature, high gas content such as coal, petroleum residue, etc., which can generate a large amount of gasification gas 32a by performing good gasification at the above temperature. In the lower gasifier 22b supplied with the raw material 31a and lowered to a temperature of 600 ° C. to 700 ° C., a biomass in which low melting point ash is generated at the temperature of 800 ° C. to 900 ° C. during gasification, By supplying raw material 31b containing low carbon such as rice straw, rice straw, sewage sludge, etc., raw material 31a that can be suitably gasified at high temperature and raw material 31b that generates low melting point ash upon gasification are simultaneously gasified. It is possible.

  Here, in FIG. 3, the low carbon-containing raw material 31b is supplied to the second stage gasifier 22b, but the low-carbon containing raw material 31b is used to gasify the low-carbon containing raw material 31b. Any one of the gasifiers in the lower stage, which is lowered to a suitable temperature of 600 ° C. to 700 ° C., can be selected and supplied. Further, as shown by a broken line in FIG. 3, a branching device 24 is provided to branch and supply the fluid medium 9 to the descending pipe 23 of the separator 21, and the fluid medium 9 branched by the branching device 24 is supplied to the branch pipe 26. 26b is supplied to the uppermost gasifier 22a and an arbitrary lower gasifier, and the temperature of the lower gasifier supplies the low-carbon-containing raw material 31b to gasify it. You may adjust so that it may become suitable temperature.

  In addition, the fluidized bed gasification method and equipment of the present invention are not limited to the above embodiments, and it is needless to say that various changes can be made without departing from the scope of the present invention.

It is a schematic side view which shows an example of the form of this invention. It is a schematic side view which shows the example of a change of the form of FIG. It is a schematic side view which shows the other example of the form of this invention. It is a schematic side view of a two-column fluidized bed gasification facility. FIG. 5 is a cut plan view of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluidized bed combustion furnace 2 Fluidized bed gasification furnace 8 Combustion gas 9 Fluidized medium 21,21a, 21b Separator 22a, 22b, 22c, 22d Gasifier 23 Downcomer 24 Branch device 25 Temperature change means 27 Gasifying agent 29 Flow Layer 30, 30a, 30b Raw material supply device 31, 31a, 31b Raw material 32a, 32b, 32c, 32d Gasification gas 33 Outlet 34, 34a, 34b Supply flow path 36a, 36b Downcomer pipe 38 Overflow pipe

Claims (6)

A fluidized bed combustion furnace for burning the char to heat the fluidized medium;
A separator for separating the fluidized medium from the combustion gas derived from the fluidized bed combustion furnace;
A fluidized bed gasification furnace for introducing a fluidized medium separated by a separator through a downcomer and supplying a raw material and a gasifying agent to gasify the raw material by a fluidized bed;
A fluidized bed gasification method having a supply flow path for circulating a char generated when gasifying a raw material in a fluidized bed gasification furnace and a fluidized medium to the fluidized bed combustion furnace,
The fluidized bed gasifier is composed of multiple gasifiers,
A raw material that can be suitably gasified at a high temperature, and a raw material from which low melting point ash is produced at the time of gasification, provided with a temperature changing means that keeps the temperature of each gasifier at a gasification temperature suitable for the gasification of the raw material Are supplied to a gasifier maintained at the corresponding gasification temperature and gasified at the same time ,
A fluidized bed gasification method characterized in that the gasification gas generated in each gasifier is separately taken out. A fluidized bed combustion furnace for burning the char to heat the fluidized medium;
A separator for separating the fluidized medium from the combustion gas derived from the fluidized bed combustion furnace;
A fluidized bed gasification furnace for introducing a fluidized medium separated by a separator through a downcomer and supplying a raw material and a gasifying agent to gasify the raw material by a fluidized bed;
A fluidized bed gasification facility having a supply flow path for circulating a char and a fluidized medium generated when gasifying a raw material in a fluidized bed gasification furnace to the fluidized bed combustion furnace,
Comprising a plurality of gasifiers that fluidize the fluid medium from the separator to gasify the raw material;
Equipped with temperature changing means adapted to maintain the temperature of each gasifier at a gasification temperature suitable for gasification of the raw material,
A raw material supply device that supplies a raw material that can be suitably gasified at a high temperature and a raw material from which low melting point ash is generated at the time of gasification to a gasifier that maintains the corresponding gasification temperature,
A fluidized bed gasification facility, wherein each gasifier is provided with an outlet for taking out gasified gas produced in each gasifier. The fluidized-bed gasification facility according to claim 2, wherein the plurality of gasifiers are arranged one above the other, and at least part of the upper and lower gasifiers are arranged so as to overlap each other when seen in a plan view .   The fluidized bed gasification facility according to claim 2, wherein the temperature changing means is a branching device that branches the fluidized medium separated by the separator and guides it to each gasifier.   The fluidized bed gasification equipment according to claim 2, wherein the temperature changing means is a plurality of separators for separating the fluidized medium from the combustion gas whose amount of combustion gas has been adjusted and guiding the separated fluidized medium to each gasifier. .   The temperature change means is configured such that each gasifier is connected in multiple stages in the vertical direction, and the fluid medium of the upper gasifier flows down to the lower gasifier via the overflow pipe, and the temperature of the upper gasifier The fluidized bed gasification facility according to claim 2, wherein the temperature of the lower gasifier is lower than that of the gasification device.

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