JP5581646B2 - Circulating fluidized bed cylindrical cylinder gasification method and apparatus - Google Patents

Description

  The present invention relates to a circulating fluidized bed cylinder gasification method and apparatus.

  2. Description of the Related Art Conventionally, development of a circulating fluidized bed gasifier that generates a gasification gas using raw materials such as coal, biomass, waste plastic, or various hydrated wastes as fuel has been promoted.

  FIG. 5 shows an example of a conventional circulating fluidized bed type gasifier, and the circulating fluidized bed type gasifier is used for gasification furnace flow of steam or the like into which the raw material is charged and also serves as a gasifying agent. A gasification furnace 2 for generating a gasified gas and a combustible solid content by gasifying the raw material by forming a fluidized bed 1 of a fluid medium (such as cinnabar) with gas, and the gasification furnace 2 Combustion furnace 5 in which combustible solids are introduced together with a fluid medium through an extraction loop seal tube 3 and fluidized bed 4 is formed by combustion furnace gas such as air or oxygen to burn the combustible solids. And a cyclone provided in the exhaust gas pipe 6 for extracting the combustion exhaust gas from the combustion furnace 5 and separating the fluid medium from the combustion exhaust gas and supplying the separated fluid medium to the gasification furnace 2 via the medium flow pipe 7 And a medium separating device 8 such as It is.

  In FIG. 5, 9 is a raw material charging pipe for charging the raw material into the gasification furnace 2, 10 is a wind box formed at the bottom of the gasification furnace 2, and 11 is gasification introduced into the wind box 10. A diffuser plate having a large number of diffuser nozzles 11a for uniformly blowing the gas for furnace flow into the gasification furnace 2 to form the fluidized bed 1, 12 is a wind box formed at the bottom of the combustion furnace 5, Reference numeral 13 denotes a diffuser plate having a large number of diffuser nozzles 13a for forming the fluidized bed 4 by uniformly blowing the combustion furnace flowing gas introduced into the wind box 12 into the combustion furnace 5.

  In the circulating fluidized bed type gasifier as described above, during normal operation, in the gasifier 2, the fluidized bed is formed on the diffuser plate 11 of the wind box 10 by the gasifier flowing gas such as water vapor that also serves as a gasifying agent. 1 is formed, and when a raw material such as coal is input from the raw material input tube 9, the raw material is gasified to generate a gasified gas and a combustible solid, and is generated in the gasifier 2. The combustible solid content is extracted together with the fluid medium through the extraction loop seal tube 3, and the combustion furnace 5 in which the fluidized bed 4 is formed on the diffuser plate 13 of the wind box 12 by the combustion furnace flow gas. The combustible solid content is combusted, and the combustion exhaust gas from the combustion furnace 5 is introduced into the medium separation device 8 via the exhaust gas pipe 6. In the medium separation device 8, the combustion exhaust gas is discharged from the combustion exhaust gas. The fluid medium is separated and the Isolated fluidized medium is returned through a medium flow down tube 7 to the gasification furnace 2, it is circulated.

Here, the fluidized medium that has become high in temperature due to the combustion of combustible solids in the combustion furnace 5 is separated together with the combustion exhaust gas through the exhaust gas pipe 6 by the medium separation device 8, and is gasified through the medium flow down pipe 7. By being supplied to the furnace 2, the high temperature of the gasification furnace 2 is maintained, and the gas generated by thermal decomposition of the raw material and the residual raw material react with water vapor, thereby causing a water gasification reaction [C + H ₂ O = H ₂ + CO] or hydrogen conversion reaction [CO + H ₂ O = H ₂ + CO ₂ ] occurs, and a combustible gasification gas such as H ₂ or CO is generated.

  The gasification gas generated in the gasification furnace 2 is supplied to a chemical plant, a gas turbine or the like after the dust and the like are separated and removed by a medium separator such as a cyclone (not shown). The combustion exhaust gas from which the fluid medium is separated in 8 is sent to an exhaust gas treatment facility.

  Incidentally, when the heat quantity during normal operation in the circulating fluidized bed gasifier is insufficient, that is, when the gasifier 2 cannot obtain sufficient heat for gasification of the raw material, the gasifier A fuel such as coal that is the same as the raw material supplied to 2 is supplied to the combustion furnace 5 in an auxiliary manner and burned to make up for the insufficient heat. In addition, during the circulation preheating operation in the stage before reaching the normal operation in the circulating fluidized bed gasifier, the raw material is not charged into the gasification furnace 2, and water vapor is supplied from the bottom of the gasification furnace 2. Instead, with the flow air supplied, the fuel such as coal is charged into the combustion furnace 5 for preheating and combusted, and the flow becomes high as the fuel burns in the combustion furnace 5. The medium is separated together with the combustion exhaust gas by the medium separation device 8 through the exhaust gas pipe 6 and supplied to the gasification furnace 2 through the medium flow pipe 7, whereby circulation preheating of the circulating fluidized bed gasification device is performed. It has come to be.

  For example, Patent Document 1 shows a general technical level related to the circulating fluidized bed type gasifier as described above.

JP 2007-112873 A

  However, in the case of the conventional circulating fluidized bed type gasifier as described above, since the gasification furnace 2 is constituted by a rectangular parallelepiped formed by combining flat plate walls, the flat plate wall is weak in strength. Reinforcement is required, and the amount of structural material used is increased, and there is a disadvantage that thermal stress tends to concentrate on the connection portion (each corner portion of the box shape) at the end of the flat plate wall.

  Further, in the gasification furnace 2 configured by the rectangular parallelepiped formed by assembling the flat plate wall, the surface area of the flat plate wall increases as the size increases, and the strength of the reinforcing member needs to be increased and the installation area needs to be widened. There is. Further, the flat plate wall is not suitable for pressure operation.

  Furthermore, when the gasification furnace 2 has a rectangular parallelepiped structure, the surface area is large, the volume (weight) of the refractory is increased, and the construction cost is increased.

  On the other hand, since the extraction loop seal tube 3 as a seal structure when extracting the fluid medium and the combustible solid content from the gasification furnace 2 is installed outside the gasification furnace 2, heat insulation for preventing heat dissipation. There was a weak point that construction of the material was complicated and not easy.

  In view of such circumstances, the present invention can reduce the amount of structural material used, can make it difficult to concentrate thermal stress, and can cope with an increase in size with a minimum installation area. The construction cost can be reduced by reducing the weight), and the surface area is also reduced, so there is little heat dissipation, and the sealing structure for extracting the fluid medium and combustible solids from the gasifier is inside the gasifier. An object of the present invention is to provide a circulating fluidized bed cylinder body gasification method and apparatus that can be installed and can simplify the construction of a heat insulating material for preventing heat dissipation.

The present invention is a gasification furnace having a vertical cylindrical body, which forms a fluidized bed of a fluidized medium with gas for gasification furnace flow, gasifies the raw material to be charged, and converts the gasification gas and the combustible solid content. The gasification gas generated in the gasification furnace is taken out, and the combustible solid content generated in the gasification furnace is introduced into the combustion furnace together with the fluidized medium, and the combustion furnace is supplied with the gas for the combustion furnace flow. A circulating fluidized bed type cylinder body that forms a fluidized bed to burn the combustible solids and separates the fluidized medium from the combustion exhaust gas of the combustion furnace with a medium separator and returns the separated fluidized medium to the gasification furnace A gasification method,
A gasification reaction fluidized bed portion having a plurality of upper and lower stages is formed in the gasification furnace having the vertical cylindrical body, and the raw material and the medium are separated from the central portion of the gasification reaction fluidized bed portion located at the uppermost stage. The fluidized medium separated by the apparatus is introduced so that the raw material and the fluidized medium flow down while sequentially passing through each gasification reaction fluidized bed part, and the center of the gasification reaction fluidized bed part located at the lowest stage The present invention relates to a circulating fluidized bed cylindrical cylinder gasification method, wherein the fluid medium and combustible solid content are extracted from a section and introduced into a combustion furnace.

In addition, the present invention provides a vertical cylinder body that forms a fluidized bed of a fluidized medium with a gasification furnace fluidizing gas and gasifies a raw material that is input to generate a gasified gas and a combustible solid content. A combustion furnace in which combustible solids generated in the gasification furnace are introduced together with a fluidized medium and a fluidized bed is formed by a combustion furnace flow gas to burn the combustible solids; A circulating fluidized bed cylindrical cylinder gasifier comprising a medium separator for separating a fluid medium from combustion exhaust gas of a combustion furnace and returning the separated fluid medium to the gasification furnace,
A gasification reaction fluidized bed portion of a plurality of upper and lower stages formed inside the gasification furnace having the vertical cylindrical body and configured to flow down while the raw material and the fluidized medium sequentially pass through;
A medium flow pipe for returning the fluidized medium separated by the medium separator to the central part of the gasified reaction fluidized bed part located at the uppermost stage of the upper and lower stages of the gasification reaction fluidized bed part;
A raw material input pipe for supplying the raw material to the outer periphery of the medium flow pipe of the gasification reaction fluidized bed portion located at the uppermost stage;
A circulating fluidized bed type cylinder body gas comprising: a fluidizing medium and a combustible solid content extracted from a central portion of a gasification reaction fluidized bed portion located at the lowest stage, and an extraction pipe for introducing it into the combustion furnace. This is related to the converter.

  According to the above means, the following operation can be obtained.

  By using a vertical gas cylinder as the gasification furnace, there is no need for reinforcing members compared to the conventional gasification furnace made up of a rectangular parallelepiped combined with flat plates, and the cylinder body plate is a thin plate. The amount of structural material used is reduced, and the cylindrical body does not have a box-like corner portion, so that thermal stress is less likely to concentrate.

  In addition, the gasification furnace using the vertical cylinder body has a smaller surface area than the conventional rectangular gasification furnace even if the size is increased, and no reinforcing member is required. By forming the gasification reaction fluidized bed portion in the gasification furnace in a plurality of upper and lower stages, the installation area does not have to be increased, and the surface area can be reduced, so that the heat radiation is also relatively reduced.

  Furthermore, the gasification furnace having the above-mentioned cylindrical cylinder body has a small surface area and a reduced volume (weight) of the refractory compared to the conventional gasification furnace having a rectangular parallelepiped structure. It becomes possible to reduce.

  According to the circulating fluidized bed cylinder gasification method and apparatus of the present invention, it is possible to reduce the amount of structural material used, to make it difficult to concentrate thermal stress, and to support upsizing with a minimum installation area. In addition, the construction cost can be reduced by reducing the volume (weight) of the refractory, and the surface area is also reduced, so there is little heat dissipation, and when the fluid medium and combustible solids are extracted from the gasifier. The sealing structure can be installed inside the gasification furnace, and an excellent effect that the construction of a heat insulating material for preventing heat radiation can be simplified can be achieved.

It is a schematic block diagram which shows the gasification furnace in the Example of this invention. It is sectional drawing which shows the raw material distributor of the gasification furnace in the Example of this invention. It is III-III sectional drawing of FIG. It is IV-IV sectional drawing of FIG. It is a whole schematic block diagram which shows an example of the conventional circulating fluidized-bed type gasifier.

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

  1 to 4 show an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 5 denote the same components, and the basic configuration is the same as the conventional one shown in FIG. However, the feature of the present embodiment is that, as shown in FIGS. 1 to 4, the gasification furnace 2 is a vertical cylindrical body, and there are a plurality of upper and lower stages (two stages in the example of FIG. 1). The gasification reaction fluidized bed portions 14 and 15 are formed, and the raw material and the fluidized medium separated by the medium separator 8 are introduced into the central portion of the gasification reaction fluidized bed portion 14 located at the uppermost (upper) stage. Then, the raw material and the fluidized medium flow down while sequentially passing through the gasification reaction fluidized bed portions 14 and 15, and the above-mentioned gasification reaction fluidized bed portion 15 located at the lowermost (lower) stage is The fluid medium and the combustible solid content are extracted and introduced into the combustion furnace 5.

  In the case of the present embodiment, the gasification reaction fluidized bed portion 14 located in the upper stage is formed in a disk shape having a smaller diameter than the inner diameter of the gasification furnace 2 on the upper part in the gasification furnace 2 having a vertical cylindrical body. The outer box weir 14a is set up on the window box 10, and the outer inner cylinder partition 14b through which the fluid medium can flow from the gap at the bottom is provided inside the outer box weir 14a. And an inner inner cylinder partition 14c through which the fluid medium can flow so as to get over from the upper end edge, and the gasification reaction fluidized bed portion 15 located in the lower stage has a saddle type A wind box 10 is formed by installing a diffuser plate 11 having a large number of diffuser nozzles 11a at the bottom of the gasification furnace 2 having a cylindrical body, and the inner inner cylinder partition 14c is formed on the wind box 10. Like the fluid medium from the top edge It has to become a configuration arranging a negotiable inner cylinder partitioning 15c to exceed Ri.

  In addition, a medium flow pipe 7 for returning the fluid medium separated by the medium separation device 8 is disposed at the center of the gasification reaction fluidized bed section 14 located in the upper stage, and the outer periphery of the medium flow pipe 7 The raw material charging cylinder 16 whose upper end opening extends over the mortar is concentrically disposed in the section, and the raw material can be charged from the raw material charging pipe 9 between the raw material charging cylinder 16 and the medium flow pipe 7. In the central portion of the gasification reaction fluidized bed portion 15 located in the lower stage, an extraction pipe 17 for extracting the fluid medium and combustible solid content and introducing it into the combustion furnace 5 is disposed, and the upper end A cylindrical seal member 18 is closed so as to cover the upper and outer circumferences of the extraction pipe 17.

  Furthermore, the raw material supply pipe 9 is provided with a raw material distributor 19 for uniformly distributing and supplying the raw material in the circumferential direction at the outer peripheral portion of the medium flow down pipe 7 of the gasification reaction fluidized bed portion 14 located in the upper stage. is there.

  2 to 4, the raw material distributor 19 is arranged at the central portion of the distribution cylinder 20 whose upper end is opened, raw material is introduced from the raw material introduction pipe 9 and whose lower end is closed. A member 21 is arranged and divided into a plurality of (four in the example of FIG. 3, a total of eight in the example of FIG. 3) in the circumferential direction of the distribution cylinder 20 in which the central distribution member 21 is arranged by the partition plate 22. The introduction chambers 23a, 23b, 23c, 23d and the discharge chambers 24a, 24b, 24c, 24d are formed so as to be 180 ° out of phase with each other in the circumferential direction of the distribution cylindrical body 20, and the central distribution member 21 Communication holes 21 a, 21 b, 21 c, 21 d for introducing the raw materials of the introduction chambers 23 a, 23 b, 23 c, 23 d to the discharge chambers 24 a, 24 b, 24 c, 24 d on the sides different in phase by 180 ° are drilled. Excretion A plurality of gas chambers 24a, 24b, 24c, 24d at the lower ends of the gasification reaction fluidized bed portion 14 whose upper end is located in the upper stage are extended into the raw material charging cylinder 16 at the same position in the circumferential direction above the outer periphery of the medium flow pipe 7. The base ends of the distribution input pipes 25a, 25b, 25c, and 25d (four in the examples of FIGS. 3 and 4) are connected.

  Next, the operation of the above embodiment will be described.

  During normal operation, in the gasification reaction fluidized bed portion 14 located at the upper stage of the gasification furnace 2 having a vertical cylindrical body and the gasification reaction fluidized bed portion 15 located at the lower stage, steam or the like serving as a gasifying agent is used. The fluidized bed 1 is formed on the diffuser plate 11 of the wind box 10 by the gasification furnace flow gas, and is formed on the outer periphery of the medium flow down pipe 7 at the center of the gasification reaction fluidized bed portion 14 located in the upper stage. When a raw material such as coal is introduced from a raw material introduction pipe 9 into a raw material introduction cylinder 16 arranged concentrically, the raw material is divided into an inner inner cylinder partition together with a circulating fluid medium as shown by arrows in FIG. 14c rises from the inner bottom, climbs over the upper edge of the inner inner cylinder partition 14c, then descends from the gap at the bottom of the outer inner cylinder partition 14b toward the outer periphery, overflows from the upper edge of the outer cylinder weir 14a Outside the gasification reaction fluidized bed 15 located in the lower stage It falls to the part, moves to the inner peripheral side while continuing fluidization, climbs over the upper edge of the inner cylinder partition 15c, enters the inside through the gap at the bottom of the cylindrical seal member 18 and rises during this flow, Steam gasification of the raw material proceeds, gasified gas and combustible solids are generated, and the gasified gas is separated and removed by a medium separator such as a cyclone (not shown), and then the chemical plant Alternatively, while being supplied to a gas turbine or the like, the combustible solid content is extracted from the upper end of the extraction pipe 17 together with the fluid medium, and is introduced into the combustion furnace 5 (see FIG. 5) to combust the combustible solid content. The combustion exhaust gas from the combustion furnace 5 is introduced into the medium separation device 8 (see FIG. 5) through the exhaust gas pipe 6 (see FIG. 5), and flows from the combustion exhaust gas in the medium separation device 8. The media was separated and separated Dynamic medium is returned to the gasification reaction fluidized bed section 14 located in the upper part of the gasification furnace 2 through a medium flow-down pipe 7, it is circulated.

  As described above, the gasification furnace 2 is a vertical cylindrical body, so that there is no need for a reinforcing member as compared with the conventional case where the gasification furnace 2 is constituted by a rectangular parallelepiped formed by combining flat plate walls. The body plate of the cylinder may be a thin plate, the amount of structural material used is reduced, and the cylindrical body does not have a box-like corner portion, so that thermal stress is difficult to concentrate.

  Further, the gasification furnace 2 having the vertical cylindrical cylinder has a surface area smaller than that of the conventional rectangular gasification furnace 2 even if the size is increased, and no reinforcing member is required. By forming the gasification reaction fluidized bed portions 14 and 15 in a plurality of upper and lower stages inside the gasification furnace 2, the installation area does not have to be increased and the surface area can be reduced, so that heat radiation is relatively Get smaller.

  Furthermore, the gasification furnace 2 having the vertical cylindrical body has a small surface area and a reduced volume (weight) of the refractory compared to the conventional case where the gasification furnace 2 has a rectangular parallelepiped structure. Costs can be reduced.

  On the other hand, if the raw material is simply introduced from the raw material introduction pipe 9 into one place in the circumferential direction of the raw material introduction cylinder 16, the raw material may not be uniformly distributed over the entire gasification reaction fluidized bed portion 14 located in the upper stage. However, the raw material supply pipe 9 is provided with a raw material distributor 19 for uniformly distributing and supplying the raw material in the circumferential direction in the outer peripheral portion of the medium flow down pipe 7 of the gasification reaction fluidized bed portion 14 located in the upper stage. Therefore, the raw material can be uniformly distributed throughout the gasification reaction fluidized bed portion 14 of the gasification furnace 2 having a vertical cylindrical body.

  Incidentally, as shown in FIGS. 2 to 4, the raw material from the raw material input pipe 9 is not uniform in the circumferential direction of the distribution cylindrical body 20 of the raw material distributor 19, for example, adjacent to the required range in the circumferential direction. Even if the material is introduced into the introduction chamber 23a and the discharge chamber 24c and the introduction chamber 23b and the discharge chamber 24d (that is, the semicircular arc region of the distribution cylindrical body 20 in FIG. 3), the raw material remains in the discharge chamber 24c ( 24d) is fed as it is into the raw material feed cylinder 16 above the outer periphery of the medium flow down pipe 7 of the gasification reaction fluidized bed portion 14 located in the upper stage from the distribution feed pipe 25c (25d), From the distribution input pipe 25a (25b) connected to the discharge chamber 24a (24b) on the side different in phase by 180 ° communicated with the introduction chamber 23a (23b) through the communication hole 21a (21b), Since the raw material is introduced into the raw material charging cylinder 16 above the outer peripheral portion of the medium flow down pipe 7 of the gasification reaction fluidized bed portion 14, the outer peripheral portion of the medium flow down tube 7 of the gasification reaction fluidized bed portion 14 located in the upper stage There is no worry of being thrown in the circumferential direction.

  Similarly, the raw material from the raw material input pipe 9 is not uniform in the circumferential direction of the distribution cylindrical body 20 of the raw material distributor 19, but, for example, the introduction chamber 23d and the discharge chamber 24a adjacent to the required range in the circumferential direction. In addition, even if the material is introduced into the introduction chambers 23b and 23c (that is, the semicircular arc-shaped region of the distribution cylinder 20 in FIG. 3), the raw material is directly supplied from the distribution input pipe 25a connected to the discharge chamber 24a. The gasification reaction fluidized bed 14 located in the upper stage is charged into the raw material charging cylinder 16 above the outer periphery of the medium flow pipe 7 and communicated with the introduction chamber 23d (23b, 23c) 21d (21b, 21c). The gasification reaction fluidized bed portion located in the upper stage from the distribution input pipe 25d (25b, 25c) connected to the discharge chambers 24d (24b, 24c) on the sides different in phase by 180 ° communicated via Since the raw material is introduced into the raw material charging cylinder 16 above the outer peripheral portion of the medium flow down pipe 7, the raw material extends in the circumferential direction at the outer peripheral portion of the medium flow down pipe 7 of the gasification reaction fluidized bed portion 14 located in the upper stage. There is no worry about being thrown in.

  In other words, the raw material does not necessarily fall evenly in the circumferential direction from the raw material input pipe 9, but rather seems to fall evenly. However, the introduction chambers 23a, 23b, 23c, 23d of the raw material distributor 19 and the discharge are discharged. Since the chambers 24a, 24b, 24c, and 24d communicate with each other through the communication holes 21a, 21b, 21c, and 21d, for example, even if a large amount of raw material falls into the introduction chamber 23c and a small amount of raw material falls into the discharge chamber 24c. These raw materials join through the communication hole 21c and are discharged from the distribution input pipe 25c, and the same thing occurs in the other introduction chambers and discharge chambers. As a result, the tip is located in the upper stage. The distribution input pipes 25a, 25b, 25c, 25d extending into the raw material input cylinder 16 at the same position in the upper peripheral direction of the outer periphery of the medium flow pipe 7 of the gasification reaction fluidized bed section 14 So that the amount of discharge is averaged.

  The number of divisions of the introduction chamber and the discharge chamber of the distribution cylinder 20 in which the central distribution member 21 of the raw material distributor 19 is arranged is not limited to eight in total, as shown in the example of FIG. Each of the three can be six, or each of the five can be ten.

  In addition, a cylindrical seal member 18 whose upper end is closed is disposed at the center of the gasification reaction fluidized bed portion 15 located at the lower stage so as to cover the upper and outer circumferences of the extraction pipe 17. As a conventional sealing structure for extracting the fluid medium and combustible solid content from the gasification furnace 2, the extraction loop seal pipe 3 (see FIG. 5) need not be installed outside the gasification furnace 2 as in the prior art. It is possible to suppress the heat dissipation of the heat and simplify the construction of the heat insulating material for preventing the heat dissipation.

  In this way, the amount of structural material used can be reduced, heat stress can be made difficult to concentrate, and the size can be increased with the minimum installation area, and the construction cost can be reduced by reducing the volume (weight) of the refractory. Reduction can be achieved, and since the surface area is small, heat radiation is small. Furthermore, a sealing structure for extracting the fluid medium and combustible solid content from the gasification furnace 2 can be installed inside the gasification furnace 2 to dissipate heat. The construction of the heat insulating material for preventing can also be simplified.

  In addition, the circulating fluidized-bed cylindrical cylinder gasification method and apparatus of the present invention are not limited to the above-described embodiments, and various changes can be made without departing from the scope of the present invention. is there.

DESCRIPTION OF SYMBOLS 1 Fluidized bed 2 Gasification furnace 4 Fluidized bed 5 Combustion furnace 7 Medium flow down pipe 8 Medium separation apparatus 9 Raw material input pipe 14 Gasification reaction fluidized bed part 14a Outer cylinder weir 14b Outer inner cylinder partition 14c Inner inner cylinder partition 15 Gasification reaction Fluidized bed portion 15c Inner cylinder partition 16 Raw material input cylinder 17 Extraction pipe 18 Cylindrical seal member 19 Raw material distributor 20 Distribution cylinder 21 Central distribution member 21a Communication hole 21b Communication hole 21c Communication hole 21d Communication hole 22 Partition plate 23a Introduction chamber 23b introduction chamber 23c introduction chamber 23d introduction chamber 24a discharge chamber 24b discharge chamber 24c discharge chamber 24d discharge chamber 25a distribution input pipe 25b distribution input pipe 25c distribution input pipe 25d distribution input pipe

Claims (2)

A gasification furnace having a vertical cylindrical body forms a fluidized bed of a fluidized medium by using a gasifying furnace fluidizing gas to gasify a raw material to be introduced to generate a gasified gas and a combustible solid. While the gasification gas generated in the gasification furnace is taken out, the combustible solid content generated in the gasification furnace is introduced into the combustion furnace together with the fluidized medium, and the fluidized bed is formed in the combustion furnace by the combustion furnace fluidizing gas. A circulating fluidized-bed cylindrical cylinder gasification method in which a fluidized medium is separated from a combustion exhaust gas of the combustion furnace by a medium separator while the combustible solid content is burned, and the separated fluidized medium is returned to the gasifier. There,
A gasification reaction fluidized bed portion having a plurality of upper and lower stages is formed in the gasification furnace having the vertical cylindrical body, and the raw material and the medium are separated from the central portion of the gasification reaction fluidized bed portion located at the uppermost stage. The fluidized medium separated by the apparatus is introduced so that the raw material and the fluidized medium flow down while sequentially passing through each gasification reaction fluidized bed part, and the center of the gasification reaction fluidized bed part located at the lowest stage A circulating fluidized bed cylindrical gasification method, wherein the fluid medium and combustible solid content are extracted from a section and introduced into a combustion furnace. A gasification furnace having a vertical cylindrical body that forms a fluidized bed of a fluidized medium with a gasification furnace fluidizing gas and gasifies a raw material to be input to generate a gasification gas and a combustible solid content; A combustion furnace in which combustible solids produced in a gasification furnace are introduced together with a fluidized medium and a fluidized bed is formed by a combustion furnace fluidizing gas to burn the combustible solids, and from the combustion exhaust gas of the combustion furnace A circulating fluidized bed cylindrical cylinder gasifier comprising a medium separator for separating the fluid medium and returning the separated fluid medium to the gasification furnace,
A gasification reaction fluidized bed portion of a plurality of upper and lower stages formed inside the gasification furnace having the vertical cylindrical body and configured to flow down while the raw material and the fluidized medium sequentially pass through;
A medium flow pipe for returning the fluidized medium separated by the medium separator to the central part of the gasified reaction fluidized bed part located at the uppermost stage of the upper and lower stages of the gasification reaction fluidized bed part;
A raw material input pipe for supplying the raw material to the outer periphery of the medium flow pipe of the gasification reaction fluidized bed portion located at the uppermost stage;
A circulating fluidized bed type cylinder body gas comprising: a fluidizing medium and a combustible solid content extracted from a central portion of a gasification reaction fluidized bed portion located at the lowest stage, and an extraction pipe for introducing it into the combustion furnace. Device.

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