JP2014237735A - Circulating fluidized bed gasification furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To introduce unreacted particles separated from a particle separator stably into a combustion furnace.SOLUTION: A circulation fluidized bed gasification furnace includes a gasification furnace which produces a gasified gas with a high-temperature moving medium, a combustion furnace for heating the moving medium, a three-opening loop seal 200 which causes the moving medium to move from the gasification furnace to the combustion furnace and seals the movement of gases between the gasification furnace and the combustion furnace and a particle separator which separates unreacted particles from the gasified gas. The three-opening loop seal 200 is introduced with the unreacted particles separated in the particle separator and causes the unreacted particles to move to the combustion furnace. The inflow per unit area of the fluidized gas in the vertical lower region 164 of the introduction inlet for unreacted particles from the particle separator is less than the inflow per unit area of the fluidized gas in other inflow regions.

Description

  The present invention relates to a circulating fluidized bed gasification furnace in which a fluidized medium forms a fluidized bed.

  In recent years, a technology for generating gasification gas by gasifying gasification raw materials such as coal, biomass, tire chips and the like has been developed instead of natural gas, which is expected to increase in price. The gasified gas thus generated is used for power generation systems, hydrogen production, synthetic fuel (synthetic petroleum) production, chemical fertilizer (urea) and other chemical products. Among gasification raw materials used as raw materials for gasification gas, coal, in particular, has a recoverable period of about 150 years, which is more than three times the extractable period of oil, and reserves are unevenly distributed compared to oil. Therefore, it is expected as a natural resource that can be supplied stably over a long period of time.

  As a technique for gasifying a gasification raw material such as coal, a technique for gasifying the gasification raw material (steam gasification) in a gasification furnace in which a fluidized medium forms a fluidized bed with steam at about 800 ° C. is disclosed. (For example, Patent Document 1).

Japanese Patent No. 3933105

  In the gasification furnace (hereinafter referred to as “circulating fluidized bed gasification furnace”) forming the fluidized bed described above, the fluidized medium is heated in the combustion furnace, and the heated fluidized medium and the gasification raw material are mixed. And introduced into the gasifier. The gasification raw material introduced into the gasification furnace is gasified by the heat of the fluidized medium, and gasified gas (synthesis gas) and combustible solids are generated. The combustible solid content is introduced into the combustion furnace through the seal portion together with the fluid medium. The seal portion seals the outflow of gasification gas from the gasification furnace and the inflow of gas from the combustion furnace by filling the inside with a fluid medium or combustible solid content. On the other hand, the gasification gas is sent to a particle separator, and unreacted particles mixed in the gasification gas are separated by the particle separator.

  Unreacted particles separated by the particle separator can be supplied to a combustion furnace and used as a heating fuel. Therefore, in order to introduce unreacted particles into the combustion furnace, a technique of a three-neck seal part in which a particle separator is further connected to a seal part that connects the gasification furnace and the combustion furnace has been devised. In the three-neck seal portion, unreacted particles separated by the particle separator are introduced into the seal portion, and are introduced into the combustion furnace together with the fluid medium inside the seal portion. However, since the fluidized medium is made to flow by injecting fluidizing gas from the bottom of the seal part, the inflowing fluidized gas exceeds the fluidizing medium and blows away unreacted particles that are not mixed in the fluidizing medium. Thus, there are cases where unreacted particles cannot be stably introduced into the combustion furnace, for example, unreacted particles flow back to the particle separator.

  Accordingly, an object of the present invention is to provide a three-neck loop seal capable of stably introducing unreacted particles into a combustion furnace with a simple configuration in view of such problems.

  In order to solve the above problems, a circulating fluidized bed gasification furnace according to the present invention forms a fluidized bed by flowing a fluidized medium with a fluidized gas, and gasifies a raw material charged into the fluidized bed to produce a gasified gas. And a combustible solid content gasification furnace, a fluidized medium and a combustible solid content are introduced, a combustible furnace for burning the combustible solid content and heating the fluidized medium, a gasification furnace and a combustion furnace, The fluidized medium and the combustible solid content are introduced from the gasification furnace, and the fluidized gas and the combustible solid content are introduced into the fluidized medium and the combustible solid content from below vertically. Flowing combustible solids from the gasification furnace to the combustion furnace, and containing the fluid medium and combustible solids inside, outflow of gasification gas generated in the gasification furnace to the combustion furnace, and combustion Inflow of gas from the furnace to the gasifier A three-neck loop seal that seals one or both of them, and a particle separator that introduces gasified gas generated in a gasification furnace and separates unreacted particles from the gasified gas. In addition, the unreacted particles separated by the particle separator are introduced, the unreacted particles are flowed to the combustion furnace, and the fluid medium, the combustible solids, and the unreacted particles are accommodated in the gas, Sealing either or both of gasification gas generated in the gasification furnace to the particle separator and gas flow from the combustion furnace to the particle separator, and introducing unreacted particles from the particle separator The inflow amount per unit area of the fluidized gas in the vertically lower region of the mouth is smaller than the inflow amount per unit area of the other inflow region of the fluidized gas.

  In addition, the three-neck loop seal has a bottom part on the gasification furnace side, which is the bottom part vertically below the outlet side of the fluid medium and combustible solids from the gasifier, and the fluid medium to the combustion furnace, combustible solids, and It may be located vertically above the bottom of the combustion furnace, which is the bottom of the unreacted particle outlet side, and an inclined surface may be formed from the bottom of the gasifier toward the bottom of the combustion furnace.

  The inclination angle of the inclined surface may be 40 degrees or more.

  In addition, the three-neck loop seal includes a medium introduction part that introduces a fluid medium and combustible solids, a particle introduction part that introduces unreacted particles, a fluid medium, combustible solids, and unreacted particles. A deriving unit for deriving to the combustion furnace includes a storage unit provided in the vertical upper part, and a first boundary part that is an upper wall part in the vertical upper part of the storage unit and forms a boundary between the medium introduction unit and the particle introduction unit is The first connection part which is the connected part protrudes toward the bottom side, and the horizontal position of the first connection part is introduced from the center of the first boundary part. Of the two surfaces, the surface on the medium introducing portion side may be inclined from the first connecting portion toward the medium introducing portion located vertically above the first connecting portion. .

  In addition, the three-neck loop seal includes a medium introduction part that introduces a fluid medium and combustible solids, a particle introduction part that introduces unreacted particles, a fluid medium, combustible solids, and unreacted particles. A deriving unit for deriving to the combustion furnace is provided in the vertical upper part, and includes a storage unit for storing the fluid medium, combustible solids, and unreacted particles, and is an upper wall portion in the vertical upper part of the storage unit, The second boundary part forming the boundary with the particle introduction part is formed by at least two surfaces, the two surfaces are connected, and the second connection part which is the connected part protrudes to the bottom side, and the second connection part The horizontal position is on the particle introduction part side from the center of the second boundary part, and of the two surfaces, the surface on the derivation part side is located from the second connection part vertically above the second connection part. An inclination may be formed toward the side.

  According to the present invention, unreacted particles separated by the particle separator can be stably introduced into the combustion furnace.

It is a figure for demonstrating the specific structure of a circulating fluidized bed gasification furnace. It is a figure for demonstrating the three neck loop seal concerning 1st Embodiment. It is a figure for demonstrating the three neck loop seal concerning 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram for explaining a specific configuration of a circulating fluidized bed gasification furnace 100. As shown in FIG. 1, the circulating fluidized bed gasification furnace 100 includes a combustion furnace 110, a medium separator (cyclone) 112, a two-port loop seal 120, a gasification furnace 130, a three-port loop seal 200, The first wind box 140, the particle separator 150, and the second wind box 160 are included. In FIG. 1, the flow of solid (fluid medium, gasification raw material, unreacted particles) is indicated by solid arrows, and the flow of gas (gasification gas, water vapor, combustion exhaust gas) is indicated by dashed-dotted arrows.

  In the present embodiment, the circulating fluidized bed gasification furnace 100 circulates as a heat medium a fluid medium composed of sand such as dredged sand (silica sand) having a particle size of about 300 μm as a whole. Specifically, the fluid medium is first heated to about 900 ° C. to 1000 ° C. in the combustion furnace 110 and introduced into the medium separator 112 together with the combustion exhaust gas. In the medium separator 112, the combustion exhaust gas and the high-temperature fluid medium are separated, and the separated combustion exhaust gas is heat recovered by a heat exchanger (for example, a boiler) not shown.

  On the other hand, the high-temperature fluid medium separated by the medium separator 112 is introduced into the gasification furnace 130 through the two-necked loop seal 120. The two-necked loop seal 120 is filled with a fluid medium and seals a space between the medium separator 112 and the gasifier 130 with the fluid medium, so that the medium separator 112 and the gasifier 130 are sealed. It plays a role of preventing the inflow of combustion exhaust gas and the outflow of gasification gas from the gasification furnace 130 to the medium separator 112.

  The gasification furnace 130 is introduced with a fluidized medium and gasified raw materials (solid raw materials) such as coal, biomass, tire chips, and the introduced gasified raw material has a temperature of about 700 ° C. to 900 ° C. of the fluidized medium. It is gasified by heat, thereby generating gasified gas (syngas) and combustible solids.

  A first wind box 140 is provided below the gasification furnace 130. When the circulating fluidized bed gasifier 100 is normally operated, fluidized gas (here, steam) is supplied into the gasifier 130 from the bottom of the gasifier 130 through the first wind box 140. ing. As described above, by supplying water vapor to the high-temperature fluid medium introduced from the medium separator 112, a fluidized bed (bubble fluidized bed) is formed in the gasification furnace 130.

  The fluid medium and combustible solids in the gasification furnace 130 are fluidized by the fluidization gas supplied from the first wind box 140 and returned to the combustion furnace 110 through the three-necked loop seal 200. The three-necked loop seal 200 is filled with a fluid medium and combustible solid content, and the space between the gasification furnace 130 and the combustion furnace 110 is sealed with the fluid medium and combustible solid content, thereby gasifying. It plays the role of preventing the outflow of gasification gas from the furnace 130 to the combustion furnace 110 and the inflow of gas (for example, combustion exhaust gas) from the combustion furnace 110 to the gasification furnace 130.

  As described above, in the circulating fluidized bed gasification furnace 100 according to the present embodiment, the fluid medium includes the combustion furnace 110, the medium separator 112, the two-port loop seal 120, the gasification furnace 130, and the three-port loop seal 200 in this order. By moving and being introduced again into the combustion furnace 110, they are circulated.

  Moreover, the gasification gas produced | generated in the gasification furnace 130 is introduce | transduced into the particle | grain separator 150, and the unreacted particle mixed in gasification gas is isolate | separated. The gasified gas from which the unreacted particles have been separated is sent to a purifier or the like, and the unreacted particles are introduced into the three-necked loop seal 200 through the downcomer 134 provided in the particle separator 150. The unreacted particles introduced into the three-necked loop seal 200 are introduced into the combustion furnace 110 together with the fluidized medium, and used as a heating fuel.

  However, a second wind box 160 is provided below the three-neck loop seal 200, and fluidized gas (water vapor) stored in the second wind box 160 flows into the three-neck loop seal 200 from the bottom surface of the three-neck loop seal 200. Has been. For this reason, the unreacted particles such as the water vapor that has flowed in over the fluidized medium blows away the unreacted particles that are not mixed in the fluidized medium, and the unreacted particles flow back to the downcomer 134 and further to the particle separator 150. May not be stably introduced into the combustion furnace 110.

  Therefore, in the three-necked loop seal 200 according to the present embodiment, the amount of water vapor that flows into the three-necked loop seal 200 is adjusted to prevent the unreacted particles from flowing back to the downcomer 134 and the particle separator 150.

  FIG. 2 is a view for explaining the three-necked loop seal 200 according to the first embodiment, FIG. 2A is a vertical sectional view of the three-necked loop seal 200, and FIG. 2B is a nozzle 162. FIG. 2C is an enlarged view of the horizontal sectional view of the nozzle 162 taken along line II (c) -II (c) of FIG. 2B. As shown in FIG. 2, the three-neck loop seal 200 includes a storage unit 210, a medium introduction path 220, a particle introduction path 230, an outlet path 240, and a second wind box 160. In FIG. 2A, the flow of solids (fluid medium, combustible solids, unreacted particles) is indicated by white arrows, and the flow of gas (water vapor) is indicated by black arrows.

  Reservoir 210 is box-shaped and contains a fluid medium, combustible solids, and unreacted particles (shown by dots in the figure). In the upper part of the storage unit 210, a medium introduction unit 212a which is an opening for introducing the fluid medium and the combustible solid content from the gasification furnace 130, and unreacted particles from the particle separator 150 are introduced. There are provided a particle introduction part 212b which is an opening, and a lead-out part 212c which is an opening for leading the fluid medium, combustible solids and unreacted particles contained in the storage part 210 to the combustion furnace 110. .

  Further, the first boundary portion 214a is an upper wall portion of the storage portion 210 formed by two surfaces, and is in contact with the fluid medium, combustible solids, and unreacted particles housed in the storage portion 210. Then, a boundary between the medium introduction part 212a and the particle introduction part 212b is formed. The second boundary portion 214b is an upper wall portion of the storage portion 210 formed by two surfaces, and is in contact with the fluid medium, combustible solids, and unreacted particles housed inside the storage portion 210, A boundary between the particle introduction part 212b and the lead-out part 212c is formed.

  A second wind box 160 is provided below the storage unit 210. The second wind box 160 is provided with a plurality of nozzles 162 (eight in this embodiment). As shown in FIGS. 2B and 2C, the nozzle 162 is provided with a plurality (four in the present embodiment) of holes (supply holes) 162a for supplying water vapor at equal intervals in the circumferential direction. The water vapor is supplied into the three-necked loop seal 200 through the hole 162a.

  One end of the medium introduction path 220 is connected to the gasification furnace 130 (see FIG. 1). The other end portion of the medium introduction path 220 is connected to the storage section 210 in a state where the flow path of the medium introduction path 220 is communicated with the medium introduction section 212a of the storage section 210. One end portion of the medium introduction path 220 is located vertically above the other end portion, the flow path is inclined from the one end portion to the other end side, and the flow direction of the fluid medium and combustible solids on the other end side Changes vertically downward.

  One end of the particle introduction path 230 is connected to a downcomer 134 provided in the particle separator 150 (see FIG. 1). The other end of the particle introduction path 230 is connected to the storage unit 210 in a state where the flow path of the particle introduction path 230 is communicated with the particle introduction unit 212 b of the storage unit 210.

  One end of the lead-out path 240 is connected to the combustion furnace 110 (see FIG. 1). Further, the other end portion of the lead-out path 240 is connected to the storage section 210 in a state where the flow path of the lead-out path 240 is communicated with the lead-out section 212 c of the storage section 210. One end of the lead-out path 240 is positioned vertically downward from the other end, and the flow direction of the fluid medium, combustible solids, and unreacted particles changes from vertically upward to vertically downward on the other end side. The path is inclined from the other end to the one end side.

  The fluid medium and combustible solids overflowing from the gasification furnace 130 are introduced from the medium introduction part 212a to the storage part 210 through the medium introduction path 220. The unreacted particles separated by the particle separator 150 are introduced from the particle introduction part 212b to the storage part 210 through the particle introduction path 230 via the downcomer 134. The fluidized medium, combustible solids, and unreacted particles introduced into the three-neck loop seal 200 cause the gasification gas from the gasification furnace 130 to flow out to the particle separator 150 and the gas from the combustion furnace 110 to flow in. Seal.

  The fluid medium, combustible solids, and unreacted particles introduced into the three-necked loop seal 200 flow from the gasification furnace 130 side to the combustion furnace 110 side by steam flowing from the nozzle 162 of the second wind box 160, By overflowing from the lead-out part 212 c to the lead-out path 240, the lead is introduced into the combustion furnace 110.

  In the three-neck loop seal 200 according to the first embodiment, a hole 162a is formed in a nozzle 162 provided in a vertically lower region 164 of the particle introduction unit 212b of the storage unit 210 (a vertically lower region of the particle separator 150 and the downcomer 134). Is blocked. For this reason, since water vapor does not flow in from the nozzle 162 in the vertically lower region 164 of the particle introduction unit 212b, unreacted particles separated by the particle separator 150 and passing through the particle introduction unit 212b are separated by the water vapor into the downcomer 134 and the particles. Backflow to the separator 150 is suppressed.

  However, even inflowing gas that has flowed in from a region other than the vertically lower region 164 of the particle introduction unit 212b, when it moves vertically upward, it diffuses and moves to the particle introduction unit 212b side, and enters the particle introduction path 230. There is a possibility that it will be introduced. Therefore, the first boundary portion 214a and the second boundary portion 214b of the three-port loop seal 200 of the first embodiment are provided with an inclination.

  The first boundary portion 214a is connected to the surface formed on the particle introduction path 230 side and the surface formed on the medium introduction path 220 side, and the first connection portion 216a that is a connection portion between the two surfaces is the storage section 210. It protrudes to the bottom side. The horizontal position of the first connection part 216a is located closer to the particle introduction part 212b than the center of the first boundary part 214a. The surface formed on the medium introduction path 220 side is inclined with respect to the horizontal plane from the first connection part 216a toward the medium introduction path 220 positioned vertically above the first connection part 216a.

  The second boundary portion 214b is connected to the surface formed on the particle introduction path 230 side and the surface formed on the lead-out path 240 side, and the second connection portion 216b, which is a connection portion between the two surfaces, is connected to the storage portion 210. Projects to the bottom side. The horizontal position of the second connecting part 216b is located closer to the particle introduction part 212b than the center of the second boundary part 214b. The surface formed on the lead-out path 240 side is inclined with respect to the horizontal plane from the second connection part 216b toward the lead-out path 240 positioned vertically above the second connection part 216b.

  When the water vapor flowing in from the second wind box 160 moves upward and comes into contact with the inclined surfaces of the first boundary portion 214a and the second boundary portion 214b, the water vapor passes along the inclined surfaces and the medium introducing portion 212a and Since it is led to the lead-out part 212c, it is possible to prevent water vapor from flowing into the particle introduction part 212b. Therefore, it is possible to further suppress the unreacted particles separated by the particle separator 150 and passing through the particle introduction part 212b from flowing back to the downcomer 134 and the particle separator 150 due to water vapor.

  As described above, according to the three-necked loop seal 200 according to the first embodiment, the unreacted particles separated by the particle separator 150 are introduced into the storage unit 210 of the three-necked loop seal 200 without being blown off by water vapor. As a result, unreacted particles can be stably introduced into the combustion furnace 110.

  In addition, even if water vapor that has flowed in from a region other than the vertically lower region 164 of the particle introduction unit 212b diffuses, it is possible to prevent water vapor from flowing into the particle introduction unit 212b, so that unreacted particles may be blown away by water vapor. Is further reduced, and it becomes possible to introduce unreacted particles into the combustion furnace 110 more stably.

  By the way, as described above, water vapor does not flow from the nozzle 162 in the vertically lower region 164 of the particle introduction unit 212b. For this reason, the fluidity | liquidity of the fluid medium in the storage part 210 may be suppressed. Therefore, in the second embodiment, a three-neck loop seal 300 that can facilitate the flow of the fluid medium without increasing the inflow amount of the fluidizing gas will be described.

  FIG. 3 is a view for explaining a three-port loop seal 300 according to the second embodiment. Note that components having substantially the same functions as the components of the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted. Here, the bottom part 310 having different functions will be described in detail.

  Specifically, the bottom 310 of the three-necked loop seal 300 is a surface provided with the nozzle 162 of the second wind box 160, and is in contact with the fluid medium, combustible solids, and unreacted particles stored in the reservoir 210. ing. The bottom 310 is a gasification furnace side bottom 312 on the medium introduction part 212a side, which is an inlet for the fluid medium and combustible solids, and is an outlet for the fluid medium, combustible solids, and unreacted particles. It is located vertically above the combustion furnace side bottom 314 on the lead-out portion 212c side and is inclined with respect to the horizontal plane from the gasifier side bottom 312 to the combustion furnace side bottom 314.

  Since the bottom part 310 of the storage part 210 is inclined, the fluid medium contained in the storage part 210, combustible by the action of gravity in the inclination direction from the gasification furnace side bottom part 312 side to the combustion furnace side bottom part 314 side. The solid content and unreacted particles easily flow from the medium introduction unit 212a side to the lead-out unit 212c side.

  The inclination angle of the inclined surface of the bottom part 310 of the storage part 210 is preferably equal to or greater than the repose angle of the fluid medium, and is preferably 40 degrees or more, more preferably 60 degrees or more.

  As described above, according to the three-necked loop seal 300 according to the second embodiment, the fluidized medium flows even if the fluidizing gas does not flow from the nozzle 162 in the vertically lower region 316 of the particle introduction unit 212b. It becomes possible to make it easier.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the first embodiment and the second embodiment, the nozzle 162 provided in the vertically lower regions 164 and 316 of the particle introduction unit 212b is configured to close the hole 162a. However, the nozzle 162 may not be provided in the vertically lower regions 164 and 316 of the particle introduction part 212b.

  Further, the holes 162a formed in the nozzles 162 provided in the vertically lower regions 164 and 316 of the particle introduction unit 212b are formed in the nozzles 162 provided in the regions other than the vertical lower regions 164 and 316 of the particle introduction unit 212b. The amount of water vapor formed from the nozzles 162 in the vertically lower regions 164 and 316 of the particle introduction unit 212b flows from the nozzles 162 in regions other than the vertically lower regions 164 and 316 of the particle introduction unit 212b. It may be less than the amount of water vapor that is produced.

  Further, the diameter of the hole 162a formed in the nozzle 162 provided in the vertically lower regions 164 and 316 of the particle introduction unit 212b is formed in the nozzle 162 provided in a region other than the vertical lower regions 164 and 316 of the particle introduction unit 212b. The amount of water vapor flowing from the nozzles 162 in the vertically lower regions 164 and 316 of the particle introduction part 212b is reduced from the nozzles 162 in the regions other than the vertical lower regions 164 and 316 of the particle introduction part 212b. It may be less than the amount of water vapor that flows in.

  In any case, the inflow amount of the fluidized gas per unit area in the vertically lower regions 164 and 316 of the particle introduction unit 212b should be smaller than the inflow amount per unit area in the other inflow regions of the fluidized gas. .

  The present invention can be used in a circulating fluidized bed gasification furnace in which a fluidized medium forms a fluidized bed.

DESCRIPTION OF SYMBOLS 100 Circulating fluidized bed gasifier 110 Combustion furnace 130 Gasifier 150 Particle separators 164, 316 Vertical lower region 200, 300 Three-neck loop seal 210 Reservoir 212a Medium inlet 212b Particle inlet 212c Leader 214a First boundary 214b 2nd boundary part 216a 1st connection part 216b 2nd connection part 310 Bottom 312 Gasification furnace side bottom 314 Combustion furnace side bottom

Claims (5)

A gasification furnace that forms a fluidized bed by flowing a fluidized medium with a fluidized gas, and gasifies a raw material charged into the fluidized bed to generate a gasified gas and a combustible solid content;
A combustion furnace in which the fluid medium and the combustible solid content are introduced, the combustible solid content is combusted, and the fluid medium is heated;
Provided between the gasification furnace and the combustion furnace, the fluidizing medium and the combustible solid content are introduced from the gasification furnace, and are perpendicular to the fluidizing medium and the combustible solid content inside. Flowing the fluidized gas from below to cause the fluidized medium and the combustible solids to flow from the gasifier to the combustion furnace, and accommodating the fluidized medium and the combustible solids therein. A three-neck loop seal that seals either or both of the outflow of the gasification gas generated in the gasification furnace to the combustion furnace and the inflow of gas from the combustion furnace to the gasification furnace; ,
A particle separator that introduces the gasification gas generated in the gasification furnace and separates unreacted particles from the gasification gas;
With
The three-necked loop seal is further introduced with the unreacted particles separated by the particle separator to flow the unreacted particles to the combustion furnace, and the fluid medium, the combustible solids, and the unreacted solids. By containing the reaction particles inside, either the outflow of the gasification gas generated in the gasification furnace to the particle separator and the inflow of gas from the combustion furnace to the particle separator or Sealing both sides,
The inflow amount per unit area of the fluidized gas in the vertically lower region of the inlet of the unreacted particles from the particle separator is smaller than the inflow amount per unit area of the other inflow region of the fluidized gas. A circulating fluidized bed gasifier. The three-neck loop seal has a gasifier-side bottom portion that is a bottom portion vertically below the outlet of the fluid medium and the combustible solids from the gasifier,
The fluid medium to the combustion furnace, the combustible solid content, and the bottom of the combustion furnace side that is the bottom of the bottom of the outlet side of the unreacted particles is located vertically above,
The circulating fluidized bed gasification furnace according to claim 1, wherein an inclined surface is formed from the gasification furnace side bottom part toward the combustion furnace side bottom part.   The circulating fluidized bed gasification furnace according to claim 2, wherein an inclination angle of the inclined surface is 40 degrees or more. The three-neck loop seal is
A medium introduction part for introducing the fluid medium and the combustible solid content therein, a particle introduction part for introducing the unreacted particles therein, the fluid medium, the combustible solid content, and the unreacted particles A deriving unit for deriving to the combustion furnace includes a storage unit provided in the vertical upper part,
A first boundary part, which is an upper wall part in a vertical upper part of the storage part and forms a boundary between the medium introduction part and the particle introduction part, is formed by at least two faces, and the two faces are connected, The first connecting portion, which is the connected portion, protrudes to the bottom side, and the horizontal position of the first connecting portion is closer to the particle introduction portion than the center of the first boundary portion. The surface on the medium introducing portion side forms an inclination from the first connecting portion toward the medium introducing portion located vertically above the first connecting portion. The circulating fluidized bed gasification furnace according to any one of the above. The three-neck loop seal is
The medium introduction part for introducing the fluid medium and the combustible solid content therein, the particle introduction part for introducing the unreacted particles therein, the fluid medium, the combustible solid content, and the unreacted particles And the storage part for storing the fluidized medium, the combustible solid content, and the unreacted particles, and
A second boundary part, which is an upper wall part in a vertical upper part of the storage part and forms a boundary between the lead-out part and the particle introduction part, is formed by at least two surfaces, and the two surfaces are connected, The second connecting portion, which is the connected portion, protrudes to the bottom side, and the horizontal position of the second connecting portion is on the particle introduction portion side from the center of the second boundary portion, and the lead-out of the two surfaces The surface on the part side forms an inclination from the second connecting part toward the lead-out part side positioned vertically above the second connecting part. A circulating fluidized bed gasification furnace as described in the paragraph.

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