Gasifier

Abstract

To provide a gasification device which can efficiently gasify a semi-carbonization-treated wood chip.SOLUTION: A gasification system 1 is composed of: a conveying device 20 which feeds a semi-carbonized wood chip S; and a reaction tower 11 which gasifies the semi-carbonized wood chip S. The conveying device 20 has a vertical direction conveying path 50 through which the semi-carbonized wood chip S is conveyed in a vertical direction from a bottom of the reaction tower 11 to an inside. The reaction tower 11 is provided on an upper part with a release pipe 12 through which a gas generated from gasification of the semi-carbonized wood chip S is released. The vertical direction conveying path 50 is configured to be a tubular shape along the vertical direction. A vertical direction screw blade 52 formed in a spiral shape along the vertical direction and rotatable around an axis along the vertical direction as a rotational axis is provided in the pipe. An upper end part of the vertical direction screw blade 52 is exposed above the bottom of the reaction tower 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a gasification apparatus for gasifying wood chips. [Background technology]

[0002] In recent years, environmental issues have been receiving increasing attention, and research is underway into power generation devices that use combustion materials generated from biomass fuels, such as naturally occurring wood chips and semi-carbonized wood chips, instead of using fossil fuels such as oil and coal for power generation.

[0003] As an example of a gasification apparatus that generates such combustion substances from biomass fuel, Patent Document 1 discloses a gasification apparatus that supplies a gasification agent such as air or steam from a gasification agent supply port provided at the bottom of a reaction tower, while feeding biomass fuel from an inlet provided at the top of the reaction tower, heating it, and gasifying the biomass fuel.

[0004] This gasification system is a so-called updraft-type gasification system, with an outlet provided on the upper side of the reaction tower for releasing the product gas generated from the biomass fuel, and an ash discharge section at the bottom for removing ash and other residues of biomass that were not gasified.

[0005] The gasification device disclosed in Patent Document 1 is said to be able to gasify biomass fuel fed from the top inside the reaction tower, and to stably remove biomass fuel (combustion residue) that falls without being completely gasified.

[0006] However, the size of the biomass fed into the reactor varies, and combustion residues that fall without being fully gasified are discarded. This means that these combustion residues cannot be effectively utilized, resulting in a problem of reduced efficiency in gasifying biomass. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-101215 Summary of the Invention [Problem to be solved by the invention]

[0008] In view of the above-mentioned problems, an object of the present invention is to provide a gasification apparatus that can efficiently gasify semi-carbonized wood chips. [Means for solving the problem]

[0009] This invention relates to a gasification apparatus for gasifying wood chips, which comprises a feeding mechanism for feeding semi-carbonized wood chips and a reaction tower for gasifying the wood chips, wherein the feeding mechanism is provided with a tubular vertical transport path along a vertical direction for transporting the wood chips from the bottom of the reaction tower to the inside, the reaction tower is provided with a discharge pipe at the top for discharging gas gasified from the wood chips and an injection part for injecting a gasifying agent into the reaction tower, the vertical transport path is formed in a spiral shape along a vertical direction within the tube, and is provided with a vertical screw blade that can rotate around an axis along a vertical direction as a rotation axis, and the vertical screw blade is The wood chips that have fallen to the bottom of the reaction tower without being gasified are circulated. The injection part is exposed above the bottom of the reaction tower, and the injection part comprises a first injection part provided at the bottom of the reaction tower and a second injection part provided at a side of the central part of the reaction tower.

[0010] The semi-carbonization process is a carbonization process in which wood chips and other materials are heated at a predetermined temperature (approximately 200 to 350 degrees) under conditions where the oxygen supply is limited or blocked, turning them into a carbon-rich substance, thereby producing a solid fuel with high energy density. The longitudinal conveying path does not necessarily have to be perfectly aligned with the vertical direction, but may be in a direction that intersects the vertical direction at an angle of less than 45 degrees, for example.

[0011] According to the present invention, semi-carbonized wood chips can be efficiently gasified. In more detail, wood chips that have been semi-carbonized can be transported from the bottom to the top of the high-temperature layer in the reaction tower, and wood chips that fall into the high-temperature layer at the upper end of the vertical screw blade without being gasified can be transported again to the high-temperature layer in the reaction tower together with new wood chips that are added to the reaction tower.

[0012] This allows wood chips that have not been sufficiently gasified to be gasified together with new wood chips. In other words, wood chips that have not been gasified inside the reaction tower can be circulated and reused, allowing wood chips with high energy density to be efficiently gasified.

[0013] In addition, the wood chips that have fallen to the bottom can be transported upward again by the vertical screw blades, so that the wood chip layers that have fallen from above can be broken down. This breaks down the stacked wood chips and eliminates bridges formed by the wood chips. Therefore, the wood chips can be stably gasified in the high-temperature layer.

[0014] In addition, the reaction tower is provided with an injection section for injecting a gasifying agent, which promotes the gasification of the wood chips, allowing the semi-carbonized wood chips to be gasified more efficiently.

[0015] Here, the gasifying agent is an accelerator that accelerates the gasification of wood chips, such as air, oxygen, water vapor, etc. The gasifying agent is not limited to the aforementioned gases, and may be any gas other than the aforementioned gases, powder, liquid, etc., as long as it can accelerate the gasification of wood chips.

[0016] As an aspect of the present invention, the first injection section may be provided in a central portion of a rotation shaft of the vertical screw blade installed inside the vertical conveying path, and the gasifying agent may be supplied upward along the longitudinal direction of the vertical conveying path.

[0017] In another aspect of the present invention, when the wood chips are gasified, three layers are formed inside the reaction tower in this order from bottom to top: a pyrolysis zone for pyrolyzing the wood chips, a combustion zone for burning the pyrolyzed wood chips, and a reduction zone for generating the gas; and the second injection section may be positioned on the side of the central part of the reaction tower at a position corresponding to the reduction zone.

[0018] In another aspect of the present invention, the discharge pipe may be configured so that the tip side is under negative pressure, and the gasifying agent may be injected into the reaction tower from the first injection part and the second injection part by the tip side of the discharge pipe being under negative pressure. According to this invention, the gas generated inside the reaction tower can be sucked into the discharge pipe, so that the gas generated inside the reaction tower can be reliably discharged from the discharge pipe.

[0019] In another aspect of the present invention, the discharge pipe may be provided with a narrowed portion having a smaller diameter at the tip than at the base end, and the tip may be provided with an aspirator for aspirating the generated gas. According to this invention, the tip end of the discharge pipe has a smaller diameter, so the flow rate of the generated gas and wood chips flowing through the smaller diameter section is faster than that of the base end of the discharge pipe. This causes the temperature at the location where the flow rate is faster to rise, allowing the remaining wood chips that have not been completely gasified to be gasified within the discharge pipe.

[0020] In another aspect of the present invention, the vertical conveying path is erected in the vertical direction and is provided with a tubular vertical conveying pipe connected to an insertion hole provided at the bottom of the reaction tower, and the vertical screw blade installed inside the vertical conveying pipe, and the vertical screw blade may protrude upward from the vertical conveying pipe and be exposed above the bottom of the reaction tower so as to circulate the wood chips that have fallen to the bottom of the reaction tower without being gasified.

[0021] In one aspect of this invention, the feeding mechanism has an inlet at one end through which the wood chips are fed, and a tubular upstream conveying path at the other end that is connected in a direction that intersects with the vertical conveying path, and the upstream conveying path is formed spirally within the tube and is provided with an upstream screw blade that rotates to transport the wood chips toward the vertical conveying path.

[0022] This invention allows wood chips to be broken down into smaller pieces when transporting them from the upstream transport path to the vertical transport path, allowing wood chips broken down to the desired size to be transported to the reaction tower, thereby enabling the wood chips to be gasified efficiently.

[0023] In more detail, wood chips discharged from the upstream conveying path by the upstream screw blade are taken into the vertical conveying path by the vertical screw blade and conveyed there, and by adjusting the conveying rate of the upstream screw blade and the vertical screw blade, the wood chips can be compressed and broken down between the vertical conveying path and the upstream conveying path to the desired size. By breaking down the wood chips to the desired size in this way, it is possible to prevent the wood chips transported to the reaction tower from forming bridges, and the surface area of ​​the broken down wood chips is increased, allowing them to be gasified efficiently.

[0024] Furthermore, by individually adjusting the rotation speeds of the upstream screw blade and the vertical screw blade, it is possible to adjust the size of the newly transported wood chips, limit the amount of newly transported wood chips, and reuse the wood chips accumulated at the bottom of the reaction tower, or increase the amount of newly transported wood chips. In other words, it is possible to gasify wood chips more efficiently according to the conditions of the reaction tower.

[0025] In another aspect of the present invention, a transport amount control unit may be provided that controls the rotation speed of the vertical screw blades and adjusts the amount of wood chips transported to the reaction tower.

[0026] The conveying amount control unit may control the conveying amount of the semi-carbonized wood chips based on, for example, the accumulation amount and density of the wood chips put into the reaction tower, the temperature inside the reaction tower, the components of the gas released, etc., or a combination of these.

[0027] According to this invention, the amount of semi-carbonized wood chips being transported can be adjusted depending on the conditions inside the reaction tower, and wood chips with high energy density can be gasified more efficiently. For example, if there are too many semi-carbonized wood chips transported inside the reaction tower, the amount of wood chips transported inside the reaction tower can be reduced to adjust the amount of wood chips accumulated inside so that they undergo thermal decomposition, etc., and can be gasified. On the other hand, if there are too few semi-carbonized wood chips inside the reaction tower, the amount of semi-carbonized wood chips transported inside the reaction tower can be increased to increase the material for gasification and promote gasification.

[0028] In another aspect of the present invention, the reaction tower is provided with an accumulation amount detection unit that detects the amount of wood chips accumulated inside the reaction tower, and the conveying amount control unit may control the rotational speed of the vertical screw blades based on the amount of wood chips detected by the accumulation amount detection unit.

[0029] This invention allows the amount of torrefied wood chips to be transported to be adjusted based on the detection results of the accumulation amount detector. That is, wood chips can be transported to the reaction tower according to the amount of wood chips accumulated inside the reaction tower, and an appropriate amount of wood chips can be accumulated inside the reaction tower. This allows the wood chips to be gasified more efficiently.

[0030] In another aspect of the present invention, the reaction tower may be provided with a temperature detection unit that detects the temperature inside the reaction tower, and the conveying amount control unit may control the rotation speed of the vertical screw blades based on the temperature detected by the temperature detection unit.

[0031] This invention allows the amount of torrefied wood chips to be transported to be adjusted based on the detection results of the temperature detector. That is, wood chips can be transported to the reaction tower according to the temperature inside the reaction tower, and an appropriate amount of wood chips can be accumulated inside the reaction tower. This allows the wood chips to be gasified more efficiently.

[0032] For example, when it is detected that the internal temperature of the reaction tower is higher than the desired temperature, the rotation speed of the vertical screw blades is increased, allowing more wood chips to be transported into the reaction tower. On the other hand, when it is detected that the internal temperature of the reaction tower is lower than the desired temperature, the rotation speed of the vertical screw blades is decreased, reducing the amount of wood chips transported into the reaction tower, allowing the wood chips accumulated inside to be gasified. This allows the wood chips to be gasified more efficiently.

[0033] In another aspect of the present invention, an analysis unit that analyzes the components of the gas may be provided, and the conveyance amount control unit may control the rotation speed of the vertical screw blades based on the components of the gas. According to this invention, the amount of semi-carbonized wood chips being transported can be adjusted based on the detection results of the analysis unit, thereby enabling the wood chips to be gasified more efficiently.

[0034] More specifically, the composition of the gas released from the reaction tower varies depending on the internal temperature of the reaction tower, the ratio of the gasifying agent, etc. Therefore, by adjusting the amount of torrefied wood chips transported based on the composition of the gas released, the internal temperature of the reaction tower and the ratio of the gasifying agent can be adjusted, resulting in a stable gas supply. This allows the amount of wood chips transported to be adjusted depending on the gasification state inside the reaction tower, allowing an appropriate amount of wood chips to be accumulated inside the reaction tower, resulting in more efficient gasification of the wood chips.

[0035] As another aspect of the present invention, an ash discharge section for discharging the wood chips accumulated at the bottom may be provided at the bottom of the reaction tower. According to this invention, wood chips and the like that have accumulated at the bottom of the reaction tower in a position where they cannot be transported upward again by the vertical screw blades can be discharged from the bottom. [Effects of the Invention]

[0036] According to the present invention, it is possible to provide a gasification apparatus that can efficiently gasify semi-carbonized wood chips. [Brief explanation of the drawings]

[0037] [Figure 1] Schematic diagram of a gasification system. [Figure 2] Schematic diagram of a conveying device and a gasification reactor. [Figure 3] Gasification flow chart. [Figure 4] Schematic diagram of wood chip fragmentation. [Figure 5] Schematic diagram of the movement of wood chips inside the reactor. DETAILED DESCRIPTION OF THE INVENTION

[0038] An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows a schematic diagram of the gasification system 1, Figure 2 shows a schematic diagram of the gasification reaction device 10 and the conveying device 20, Figure 3 shows a flowchart of gasification using the gasification system 1, Figure 4 shows a schematic diagram showing the conveyance of semi-carbonized wood chips S stored in the surge tank 30, and Figure 5 is a conceptual diagram showing the movement of semi-carbonized wood chips S inside the reaction tower 11.

[0039] Gasification system 1 is an updraft type gasification system that gasifies semi-carbonized wood chips (hereinafter referred to as "semi-carbonized wood chips S") by pyrolysis, combustion, and reduction, and collects the generated gas G from above.

[0040] More specifically, in the gasification system 1, the semi-carbonized wood chips S are transported upward from the bottom of a reaction tower 11, which is a substantially cylindrical vertical container, and then the semi-carbonized wood chips S are gasified in the reaction tower 11, whose internal temperature has been increased. The product gas G (carbon monoxide and hydrogen) generated by this gasification is released from a release pipe 12 provided above the reaction tower 11 and stored in a gas storage section 60.

[0041] The structure of the gasification system 1 and gasification of semi-carbonized wood chips S using the gasification system 1 will be described below. As shown in Figure 1, the gasification system 1 is composed of a gasification reaction device 10 that gasifies semi-carbonized wood chips S, a transport device 20 that transports the semi-carbonized wood chips S, which are the raw material for gasification, to the gasification reaction device 10, and a gas storage section 60 that stores the product gas G generated in the gasification reaction device 10.

[0042] The gasification reaction device 10 is composed of a reaction tower 11 that gasifies the semi-carbonized wood chips S, a discharge pipe 12 that discharges the product gas G generated in the reaction tower 11, and a gasifying agent supply pipe 13 that supplies a gasifying agent H from the bottom of the reaction tower 11. The reaction tower 11 is also equipped inside with a heater 14 that increases the internal temperature of the reaction tower 11, a temperature sensor 15 that detects the internal temperature of the reaction tower 11, and a storage amount detection sensor 16 that detects the amount of semi-carbonized wood chips S stored inside the reaction tower 11.

[0043] The reaction tower 11 is a vertical, generally cylindrical container, with a conical bottom tapering downward. The apex of the cone is provided with an insertion hole for connection to a vertical transport pipe 51, which will be described later. The bottom of the reaction tower 11 is also provided with an ash discharge section 17 for scraping out the residue of the semi-carbonized wood chips S that was not completely gasified.

[0044] When gasifying the semi-carbonized wood chips S, three layers are formed inside the reaction tower 11, from bottom to top, as shown in Figure 1: a pyrolysis zone T1 where the semi-carbonized wood chips S are pyrolyzed, a combustion zone T2 where the pyrolyzed semi-carbonized wood chips S are burned, and a reduction zone T3 where the generated gas G (carbon monoxide and hydrogen) is generated.

[0045] The discharge pipe 12 is a pipe for discharging the product gas G generated inside the reaction tower 11 to the outside, and is provided at the top of the reaction tower 11. As shown in Fig. 2, the discharge pipe 12 is integrally formed of a base-end side discharge pipe 12a connected to the side wall of the reaction tower 11, a reduced diameter section 12b whose inner diameter decreases toward the tip side, and a tip-end side discharge pipe 12c connected to the reduced diameter section 12b. The diameter of the tip-end side discharge pipe 12c is reduced compared to that of the base-end side discharge pipe 12a.

[0046] The tip of the tip-side discharge pipe 12c is provided with a gas storage section 60 for storing the generated gas G and an aspirator 71 for aspirating the generated gas G. A portion of the tip-side discharge pipe 12c is also branched, and a gas analyzer 72 for analyzing the components of the generated gas G is attached to it.

[0047] The suction device 71 creates a negative pressure in the discharge pipe 12, allowing the generated gas G to be guided to the gas storage section 60.

[0048] A gas analyzer 72 provided before the gas storage unit 60 collects the results of component analysis of the product gas G generated in the reaction tower 11 and transmits the analysis results to a rotation control unit 73 . The rotation control unit 73 controls the rotation speeds of the rotary valve 33, the upstream screw blade 43, and the vertical screw blade 52, which will be described later, and controls the amount of semi-carbonized wood chips S transported to the reaction tower 11.

[0049] The gasifying agent supply pipe 13 supplies the gasifying agent H (air and steam) supplied from a gasifying agent supply device 18 connected to the base end side to the inside of the reaction tower 11. This gasifying agent supply pipe 13 is composed of a first supply pipe 13a connected to the bottom of the reaction tower 11 and a second supply pipe 13b connected to the side of the central part of the reaction tower 11.

[0050] The first supply pipe 13a is provided at the center of the rotation axis of the vertical screw blade 52 installed inside the vertical conveying pipe 51 described later, and can supply the gasifying agent H upward along the longitudinal direction of the vertical conveying pipe 51.

[0051] The first supply pipe 13a may be arranged along the outer circumferential surface of the vertical transport pipe 51, or may be arranged at another position on the bottom of the reaction tower 11.

[0052] The second supply pipe 13b is connected to the side surface of the central part of the reaction tower 11, and can supply the gasifying agent H from the side of the reaction tower 11 to the inside. More specifically, the second supply pipe 13b is arranged at a position corresponding to the reduction zone T3 of the reaction tower 11.

[0053] The heater 14 is a heating device for raising the temperature inside the reaction tower 11 in the initial stage of gasifying the semi-carbonized wood chips S. The heater 14 may also be used to increase the temperature inside the reaction tower 11 when generating the product gas G based on the temperature detection result by the temperature sensor 15.

[0054] The temperature sensor 15 detects the internal temperature of the reaction tower 11. The detection result detected by the temperature sensor 15 is transmitted to the rotation control unit 73.

[0055] The storage amount detection sensor 16 detects the amount of semi-carbonized wood chips S accumulated inside the reaction tower 11. Specifically, it detects whether the accumulated semi-carbonized wood chips S inside the reaction tower 11 are higher or lower than a desired height. The temperature detection result detected by this storage amount detection sensor 16 is transmitted to the rotation control unit 73. The rotation control unit 73 controls the rotation speeds of the rotary valve 33, the upstream screw blade 43, and the vertical screw blade 52 based on the transmitted result information.

[0056] The conveying device 20 is composed of a surge tank 30 that stores semi-carbonized wood chips S to be transported to the gasification reaction device 10, an upstream conveying path 40 that transports the semi-carbonized wood chips S from the surge tank 30 to the gasification reaction device 10, and a vertical conveying path 50 that transports the semi-carbonized wood chips S to the reaction tower 11, and is equipped with an external screw feeder F with a rotation motor attached to its upper end.

[0057] The surge tank 30 is composed of a surge tank body 31 that stores semi-carbonized wood chips S, a supply pipe 32 connected to the lower end of the surge tank body 31, and a rotary valve 33 installed between the surge tank body 31 and the supply pipe 32.

[0058] The supply pipe 32 is a tubular transport path, one end of which is connected via a rotary valve 33 to a fuel inlet 31a provided at the lower end of the tapered surge tank main body 31, and the other end of which is connected to the upstream transport path 40. The rotary valve 33 is rotatable by a rotary valve motor 34, and can feed the semi-carbonized wood chips S stored in the surge tank body 31 into the supply pipe 32. The rotary valve motor 34 is controlled by the rotation control unit 73 as described above. Furthermore, by providing an external screw feeder F, it is possible to prevent the semi-carbonized wood chips S from bridging inside the surge tank body 31, and to more reliably supply the semi-carbonized wood chips S to the supply pipe 32.

[0059] The semi-carbonized wood chips S stored in the surge tank body 31 are carbonized materials with a high carbon content obtained by pyrolyzing wood biomass such as wood chips at high temperatures of 200 to 350 degrees under oxygen-free conditions. These semi-carbonized wood chips S have a high energy density per weight and good crushing performance.

[0060] As shown in Figures 1 and 2, the upstream conveying path 40 is composed of a tubular upstream conveying pipe 41, an intermediate conveying pipe 42 curved from the lower end of the upstream conveying pipe 41 toward the gasification reaction device 10, an upstream screw blade 43 installed inside the upstream conveying pipe 41, and a rotary motor 44 that rotates and drives the upstream screw blade 43.

[0061] The upstream conveying pipe 41 is a tubular body that stands upright in the vertical direction, and has an inlet on one side to which the tip of the supply pipe 32 is connected. In addition, a rotary motor 44 that rotates the upstream screw blade 43 is provided at the upper end of the upstream conveying pipe 41.

[0062] The intermediate conveying pipe 42 is a tubular body having an orthogonal cross section perpendicular to the central axis that has the same shape as the orthogonal cross section of the upstream conveying pipe 41, and is curved in an arc as shown in Figure 2. The base end of this intermediate conveying pipe 42 is connected to the upstream conveying pipe 41, and the tip end is connected to the vertical conveying pipe 51 that forms the vertical conveying path 50.

[0063] The upstream screw blade 43 is a blade used in a so-called spring conveyor that is formed in a spiral shape and can rotate while bending, and extends along the upstream conveying pipe 41 and the intermediate conveying pipe 42 from the upper end of the upstream conveying pipe 41 to the tip of the intermediate conveying pipe 42.

[0064] The upper end of this upstream screw blade 43 is connected to a rotary motor 44, and can rotate freely inside the upstream conveying pipe 41 and the intermediate conveying pipe 42. This allows the semi-carbonized wood chips S fed from the feed port to be transported to the tip of the intermediate conveying pipe 42. The rotary motor 44 is connected to a rotation control unit 73 , which controls the rotation speed of the upstream screw blade 43 .

[0065] The vertical conveying path 50 is composed of a tubular vertical conveying pipe 51, a vertical screw blade 52 installed inside the vertical conveying pipe 51, and a rotary motor 53 that drives the vertical screw blade 52 to rotate. The vertical transport pipe 51 is a tubular body erected in the vertical direction, and is disposed below the reaction tower 11. A connecting portion is provided on the side of the central portion of the vertical transport pipe 51, which is connected perpendicularly to the intermediate transport pipe 42 connected to the lower end of the upstream transport pipe 41.

[0066] The vertical screw blade 52 installed inside the vertical conveying pipe 51 is a so-called screw feeder that is formed in a spiral shape along the vertical direction and can rotate around an axis that also extends along the vertical direction. The lower end of this vertical screw blade 52 is connected to a rotation motor 53 provided at the lower end of the vertical conveying pipe 51, and can rotate freely inside the vertical conveying pipe 51.

[0067] In addition, the vertical screw blade 52 is configured to be longer than the vertical conveying pipe 51. Therefore, an exposed portion 52a that protrudes beyond the upper end of the vertical conveying pipe 51 is formed in the upper portion of the vertical screw blade 52. The rotation motor 53 is connected to a rotation control unit 73, which controls the rotation speed of the vertical screw blades 52.

[0068] The vertical conveying path 50 configured in this manner is disposed below the reaction tower 11, and the upper end of the vertical conveying pipe 51 is connected to the insertion hole. Therefore, the exposed portion 52a, which is the upper end portion of the vertical screw blade 52, protrudes above the insertion hole, i.e., the bottom of the reaction tower 11.

[0069] Next, a method for transporting the semi-carbonized wood chips S to the reaction tower 11 using the transport device 20 and gasification in the reaction tower 11 will be briefly described with reference to FIG. As a preliminary step before operating the gasification system 1, the semi-carbonized wood chips S, which are the raw material, are stored in the surge tank main body 31 (step s0). Because the semi-carbonized wood chips S at the stage of being stored in the surge tank main body 31 have been semi-carbonized, their mass has been reduced to approximately 45 to 68% compared to the mass of the wood chips before semi-carbonization.

[0070] First, in order to transport the semi-carbonized wood chips S to the reaction tower 11, the rotary valve 33, the intermediate conveying pipe 42, and the vertical screw blade 52 are each rotated (step s1). As a result, the semi-carbonized wood chips S stored in the surge tank main body 31 are crushed by the rotary valve 33 and conveyed to the supply pipe 32, and then directly fed into the upstream conveying pipe 41. Furthermore, the semi-carbonized wood chips S fed into the upstream conveying pipe 41 are conveyed downward along the upstream conveying pipe 41 and the intermediate conveying pipe 42 by the rotation of the upstream screw blade 43.

[0071] Here, by setting the rotation speed of the vertical screw blades 52 slower than the rotation speed of the upstream screw blades 43, the semi-carbonized wood chips S are consolidated in the intermediate conveying pipe 42. When the semi-carbonized wood chips S consolidated in the intermediate conveying pipe 42 are fed into the vertical conveying pipe 51, they are broken down by the vertical screw blades 52 rotating inside the vertical conveying pipe 51 and then fed into the vertical conveying pipe 51. The semi-carbonized wood chips S thus fed into the vertical transport pipe 51 are transported into the reaction tower 11 along the vertical transport pipe 51 by the rotation of the vertical screw blades 52 .

[0072] The semi-carbonized wood chips S introduced into the reaction tower 11 in this manner are fragmented to a size that is approximately one-half to one-third of the size of the semi-carbonized wood chips S stored in the surge tank main body 31. Therefore, the semi-carbonized wood chips S are accumulated inside the reaction tower 11 without forming bridges (see FIG. 4).

[0073] 5, the semi-carbonized wood chips S transported to the reaction tower 11 in this way have their central portion rise up against gravity due to the transport of the semi-carbonized wood chips S by the vertical screw blades 52. On the other hand, the radially outer portion of the reaction tower 11 is pressed downward by the rise in the central portion, and the semi-carbonized wood chips S that have moved downward are compacted and pulverized by the semi-carbonized wood chips S piled up above.

[0074] Furthermore, since the bottom of the reaction tower 11 is configured in a conical shape, the semi-carbonized wood chips S pressed downward are gathered in the center along the conical shape. The semi-carbonized wood chips S gathered in the center in this way are caught up in the vertical screw blades 52 and lifted upward again. Therefore, semi-carbonized wood chips S that are not completely gasified (combustion residue of semi-carbonized wood chips S) can be prevented from accumulating at the bottom of the reaction tower 11.

[0075] Furthermore, the reaction tower 11 in which the semi-carbonized wood chips S are accumulated is heated to a temperature suitable for gasifying the semi-carbonized wood chips S by the heater 14 when the gasification system 1 starts up. Then, when gasification (pyrolysis, combustion, reduction) of the semi-carbonized wood chips S starts, the heater 14 is stopped. After that, the internal temperature of the reaction tower 11 is basically controlled by the combustion of the semi-carbonized wood chips S for gasification.

[0076] When gasification of the semi-carbonized wood chips S begins, generated gas G (carbon monoxide and hydrogen) is generated inside the reaction tower 11, and this generated gas G is drawn into the discharge pipe 12, which is provided at the top and has a negative pressure at its tip. This allows the generated gas G to be stored in the gas storage section 60.

[0077] Furthermore, since the tip side of the discharge pipe 12 is under negative pressure, the gasifying agent H is supplied into the reaction tower 11 through the first supply pipe 13a and the second supply pipe 13b provided in the center part of the rotation shaft of the vertical screw blade 52. In this way, the gasifying agent H supplied to the reaction tower 11 becomes an ascending air current through the discharge pipe 12, which can promote the gasification of the semi-carbonized wood chips S inside the reaction tower 11 and also allow the finely divided semi-carbonized wood chips S to rise.

[0078] This promotes gasification of the finely divided semi-carbonized wood chips S, and further prevents the semi-carbonized wood chips S that have not been completely gasified from accumulating at the bottom of the reaction tower 11. Furthermore, it can help draw the combustion residue of the semi-carbonized wood chips S that have not been completely gasified into the discharge pipe 12.

[0079] Here, the discharge pipe 12 has the base end side discharge pipe 12a and the tip end side discharge pipe 12c connected by the reduced diameter section 12b, so the flow rate of the semi-carbonized wood chips S flowing inside the discharge pipe 12 becomes faster at the reduced diameter section 12b and the tip end side discharge pipe 12c. This increases the temperature of the combustion residue of the semi-carbonized wood chips S that was not completely gasified, so that the combustion residue of the semi-carbonized wood chips S can be completely gasified. This makes it possible to prevent combustion residue of the semi-carbonized wood chips S from remaining at the bottom of the reaction tower 11.

[0080] A temperature sensor 15 is provided inside the reaction tower 11, and detects the internal temperature of the reaction tower 11 (step s2). The temperature detection result detected by this temperature sensor 15 is transmitted to the rotation control unit 73, and the rotation control unit 73 controls the rotation speeds of the rotary valve 33, the upstream screw blade 43, and the vertical screw blade 52 based on the transmitted detection result information, thereby adjusting the conveyance amount of the semi-carbonized wood chips S (step s6).

[0081] Similarly, the storage amount detection sensor 16 detects the amount of semi-carbonized wood chips S accumulated inside the reaction tower 11 (step s3), and the detection result is transmitted to the rotation control unit 73. Then, the rotation control unit 73 controls the rotation speeds of the rotary valve 33, the upstream screw blade 43, and the vertical screw blade 52 based on the transmitted detection result information, thereby adjusting the transport amount of semi-carbonized wood chips S (step s6).

[0082] Furthermore, the components of the product gas G generated from the reaction tower 11 are analyzed by the gas analyzer 72 attached before the gas storage unit 60 (step s4). The analysis results are also sent to the rotation control unit 73, which controls the rotation speeds of the rotary valve 33, the upstream screw blade 43, and the vertical screw blade 52 based on the sent analysis result information, thereby adjusting the transport amount of the semi-carbonized wood chips S (step s6).

[0083] For example, if the temperature sensor 15 detects that the internal temperature of the reaction tower 11 is lower than the optimum temperature (step s2: No), the semi-carbonized wood chips S being transported to the reaction tower 11 cannot be efficiently gasified. In this case, the rotation control unit 73 receives the temperature detection result and controls the rotary valve motor 34 to increase the rotation speed of the rotary valve 33, thereby increasing the amount of semi-carbonized wood chips S transported to the supply pipe 32.

[0084] Furthermore, by controlling the rotation motor 44 and the rotation motor 53 using the rotation control unit 73 and adjusting the rotation speeds of the upstream screw blade 43 and the vertical screw blade 52, the semi-carbonized wood chips S in the intermediate conveying pipe 42 can be further compacted and broken down into smaller pieces. Specifically, by making the rotation speed of the upstream screw blade 43 faster than the rotation speed of the vertical screw blade 52 (step s6), a large amount of semi-carbonized wood chips S transported from the surge tank 30 clogs the intermediate conveying pipe 42, resulting in further compaction. In this way, the semi-carbonized wood chips S are transported to the reaction tower 11 by the vertical screw blade 52, so that the semi-carbonized wood chips S can be further compacted. As a result, the semi-carbonized wood chips S transported to the reaction tower 11 are efficiently gasified, and the internal temperature of the reaction tower 11 can be increased.

[0085] Similarly, when the amount of semi-carbonized wood chips S inside the reaction tower 11 decreases, the storage amount detection sensor 16 detects the decrease in the semi-carbonized wood chips S (step s3: No) and transmits this information to the rotation control unit 73. Based on this information, the rotation control unit 73 controls the rotation motor 44 to increase the rotation speed of the upstream screw blade 43, and also controls the rotation motor 53 to increase the rotation speed of the vertical screw blade 52 (step s6), thereby increasing the amount of semi-carbonized wood chips S transported to the reaction tower 11 and promoting the gasification of the semi-carbonized wood chips S.

[0086] Conversely, if the amount of semi-carbonized wood chips S accumulated inside the reaction tower 11 is increasing, the storage amount detection sensor 16 detects the increase in semi-carbonized wood chips S (step s3: No) and sends this information to the rotation control unit 73. Based on this information, the rotation control unit 73 reduces the rotation speed of the vertical screw blades 52 (step s6) to further compact the semi-carbonized wood chips S in the intermediate conveying pipe 42. This allows the vertical screw blades 52 to convey finer semi-carbonized wood chips S to the reaction tower 11. Therefore, the semi-carbonized wood chips S can be broken down into smaller pieces while reducing the amount of semi-carbonized wood chips S being transported, which increases the surface area of ​​the semi-carbonized wood chips S and allows them to be gasified efficiently.

[0087] Similarly, if the components of the generated gas G detected by the gas analyzer 72 are not in the desired ratio (step s4: No), the rotation control unit 73 controls the rotary valve motor 34, the rotary motor 44, and the rotary motor 53 based on this information to adjust their respective rotation speeds (step s6). This adjusts the amount, size, and density of the semi-carbonized wood chips S conveyed to the reaction tower 11, and the components of the generated gas G are adjusted to the appropriate ratio.

[0088] In this way, adjustment of the rotation speeds of the rotary valve 33, the upstream screw blade 43, and the vertical screw blade 52 is repeated depending on the internal conditions of the reaction tower 11 until a predetermined amount of product gas G is obtained (step s5), and the semi-carbonized wood chips S are gasified under the desired conditions. After the predetermined amount of product gas G is obtained, the rotation of the rotary valve 33, the upstream screw blade 43, and the vertical screw blade 52 is stopped, and gasification is completed.

[0089] In addition, by controlling the gasifying agent supply device 18 with the rotation control unit 73, the supply amount of the gasifying agent H supplied from the first supply pipe 13a and the second supply pipe 13b can be controlled, and the gasification inside the reaction tower 11 can be adjusted.

[0090] The gasification system 1 configured in this manner is composed of a conveying device 20 for feeding semi-carbonized wood chips S and a reaction tower 11 for gasifying the semi-carbonized wood chips S. The conveying device 20 is equipped with a vertical conveying path 50 for conveying the semi-carbonized wood chips S vertically (up and down) from the bottom of the reaction tower 11 to the inside. The reaction tower 11 has an emission pipe 12 at the top for discharging the generated gas G gasified from the semi-carbonized wood chips S. The vertical conveying path 50 is configured in a tubular shape along the vertical direction, and within the tube is provided a vertical screw blade 52 that is formed spirally along the vertical direction and is rotatable around an axis along the vertical direction as the rotation axis. The upper end portion (exposed portion 52a) of the vertical screw blade 52 is exposed above the bottom of the reaction tower 11.

[0091] This allows the semi-carbonized wood chips S to be transported from the bottom to the top to the high-temperature layer in the reaction tower 11, and semi-carbonized wood chips S that fall from the exposed portion 52a without being gasified in the reduction zone T3 can be transported again to the reduction zone T3 in the reaction tower 11 together with newly added semi-carbonized wood chips S to the reaction tower 11.

[0092] This allows the semi-carbonized wood chips S that have not been sufficiently gasified to be gasified together with new semi-carbonized wood chips S. In other words, the semi-carbonized wood chips S that have not been gasified inside the reaction tower 11 can be circulated and reused, allowing the semi-carbonized wood chips S with high energy density to be efficiently gasified.

[0093] Furthermore, the semi-carbonized wood chips S that have fallen to the bottom can be transported upward again by the exposed portion 52a, so that semi-carbonized wood chips S that have fallen from above and piled up can be broken down. This breaks down the piled semi-carbonized wood chips S, and bridges formed by the semi-carbonized wood chips S can be eliminated. Therefore, the semi-carbonized wood chips S can be stably gasified in the high-temperature layer.

[0094] In addition, the conveying device 20 has an inlet at one end through which semi-carbonized wood chips S are fed, and a tubular upstream conveying path 40 at the other end that is connected in a cross direction that intersects with the vertical conveying path 50.The upstream conveying path 40 is formed spirally within the pipe and is equipped with an upstream screw blade 43 that rotates to convey the semi-carbonized wood chips S toward the vertical conveying path 50.

[0095] This allows the semi-carbonized wood chips S to be broken down into smaller pieces when transporting them from the upstream transport path 40 to the vertical transport path 50. This allows semi-carbonized wood chips S of the desired size to be transported to the reaction tower 11, allowing the semi-carbonized wood chips S with high energy density to be efficiently gasified.

[0096] More specifically, the semi-carbonized wood chips S carried out from the upstream conveying path 40 by the upstream screw blade 43 are taken into the vertical conveying path 50 by the vertical screw blade 52 and conveyed there, and by adjusting the conveying amount of the upstream screw blade 43 and the conveying amount of the vertical screw blade 52, the semi-carbonized wood chips S can be compressed and broken down into pieces of the desired size between the vertical conveying path 50 and the upstream conveying path 40. By breaking down the semi-carbonized wood chips S in this way, it is possible to reliably prevent the semi-carbonized wood chips S transported to the reaction tower 11 from forming bridges, and the surface area of ​​the broken semi-carbonized wood chips S is increased, allowing them to be gasified efficiently.

[0097] Furthermore, by individually adjusting the rotation speeds of the upstream screw blade 43 and the vertical screw blade 52, it is possible to adjust the size of the fragments of the new semi-carbonized wood chips S to be transported, and to limit the amount of new semi-carbonized wood chips S transported, thereby reusing the semi-carbonized wood chips S accumulated at the bottom of the reaction tower 11, or to increase the amount of new semi-carbonized wood chips S transported. In other words, it is possible to gasify the semi-carbonized wood chips S more efficiently according to the conditions of the reaction tower 11.

[0098] Furthermore, the reaction tower 11 is provided with a gasifying agent supply pipe 13 for injecting a gasifying agent H, which promotes the gasification of the semi-carbonized wood chips S, thereby enabling the semi-carbonized wood chips S, which have a high energy density, to be gasified more efficiently.

[0099] In addition, a rotation control unit 73 is provided that controls the rotation speed of the vertical screw blades 52 and adjusts the amount of semi-carbonized wood chips S transported to the reaction tower 11, so that the amount of semi-carbonized wood chips S transported can be adjusted according to the internal conditions of the reaction tower 11, and the semi-carbonized wood chips S can be gasified more efficiently.

[0100] For example, if there is an excess of semi-carbonized wood chips S transported inside the reaction tower 11, the amount of semi-carbonized wood chips S transported inside the reaction tower 11 can be reduced, and the semi-carbonized wood chips S accumulated inside can be adjusted to undergo thermal decomposition, etc., and can be gasified. On the other hand, if there are too few semi-carbonized wood chips S inside the reaction tower 11, the amount of semi-carbonized wood chips S transported inside the reaction tower 11 can be increased to increase the material for gasification and promote gasification.

[0101] In addition, the reaction tower 11 is equipped with a storage amount detection sensor 16 that detects the amount of semi-carbonized wood chips S accumulated inside the reaction tower 11, and the rotation control unit 73 controls the rotation speed of the vertical screw blades 52 based on the amount of semi-carbonized wood chips S detected by the storage amount detection sensor 16, thereby adjusting the amount of semi-carbonized wood chips S transported based on the detection result of the storage amount detection sensor 16.

[0102] That is, the semi-carbonized wood chips S can be transported to the reaction tower 11 according to the amount of semi-carbonized wood chips S accumulated inside the reaction tower 11, and an appropriate amount of semi-carbonized wood chips S can be accumulated inside the reaction tower 11. Therefore, the semi-carbonized wood chips S can be gasified more efficiently.

[0103] In addition, the reaction tower 11 is equipped with a temperature sensor 15 that detects the internal temperature, and the rotation control unit 73 controls the rotation speed of the vertical screw blades 52 based on the temperature detected by the temperature sensor 15, thereby allowing the amount of semi-carbonized wood chips S to be adjusted based on the detection results of the temperature sensor 15.

[0104] That is, the semi-carbonized wood chips S can be transported to the reaction tower 11 according to the temperature inside the reaction tower 11, and an appropriate amount of semi-carbonized wood chips S can be accumulated inside the reaction tower 11. Therefore, the semi-carbonized wood chips S can be gasified more efficiently.

[0105] For example, when it is detected that the internal temperature of the reaction tower 11 is rising compared to the desired temperature, the rotation speed of the vertical screw blades 52 is increased to transport more semi-carbonized wood chips S into the reaction tower 11, thereby lowering the internal temperature of the reaction tower 11. On the other hand, when it is detected that the internal temperature of the reaction tower 11 is falling compared to the desired temperature, the rotation speed of the vertical screw blades 52 is decreased to reduce the amount of semi-carbonized wood chips S transported into the reaction tower 11, thereby increasing the reaction efficiency of the semi-carbonized wood chips S accumulated inside and enabling the semi-carbonized wood chips S to be gasified more efficiently.

[0106] Furthermore, a gas analyzer 72 is provided to analyze the components of the gas, and the rotation control unit 73 controls the rotation speed of the vertical screw blades 52 based on the components of the gas, thereby adjusting the amount of semi-carbonized wood chips S being conveyed based on the detection results of the gas analyzer 72, and enabling the semi-carbonized wood chips S to be gasified more efficiently.

[0107] More specifically, the components of the gas released from the reaction tower 11 change depending on the internal temperature of the reaction tower 11, the ratio of the gasifying agent H, and the like. Therefore, by adjusting the amount of semi-carbonized wood chips S transported based on the components of the gas released, the internal temperature of the reaction tower 11 and the ratio of the gasifying agent H can be adjusted, and a stable gas supply can be achieved. This makes it possible to adjust the amount of semi-carbonized wood chips S transported depending on the state of gasification inside the reaction tower 11, accumulate an appropriate amount of semi-carbonized wood chips S inside the reaction tower 11, and more efficiently gasify the semi-carbonized wood chips S.

[0108] In addition, the discharge pipe 12 is configured so that the tip side is under negative pressure, so that the gas that has been gasified inside the reaction tower 11 can be sucked into the discharge pipe 12, thereby ensuring that the gasified gas can be released from the discharge pipe 12.

[0109] Furthermore, the gasifying agent H supplied from the gasifying agent supply pipe 13 can be drawn into the reaction tower 11, creating an ascending air current, which makes it easier to lift the semi-carbonized wood chips S transported by the vertical screw blades 52 above the reduction zone T3. Furthermore, semi-carbonized wood chips S that have not been completely gasified can be drawn into the discharge pipe 12.

[0110] Furthermore, the discharge pipe 12 is provided with a tip-side discharge pipe 12c whose tip is smaller in diameter than its base end, thereby narrowing the diameter of the tip side of the discharge pipe 12. This increases the flow rate of the generated gas G and semi-carbonized wood chips S flowing through the reduced diameter section 12b and the tip-side discharge pipe 12c, raising the temperature at the location where the flow rate is increased, and allowing the combustion residue of the semi-carbonized wood chips S that is not completely gasified to be gasified inside the discharge pipe 12.

[0111] In addition, an ash discharge section 17 is provided at the bottom of the reaction tower 11 to discharge semi-carbonized wood chips S that have accumulated at the bottom, so that semi-carbonized wood chips S that have accumulated at the bottom of the reaction tower 11 and in a position where they will not be transported upward again by the vertical screw blades 52 can be discharged from the bottom.

[0112] In correspondence between the configuration of this invention and the above-mentioned embodiment, Wood chips correspond to semi-carbonized wood chips S, and similarly, The input mechanism corresponds to the conveying device 20, The reaction tower corresponds to reaction tower 11, The gasifier corresponds to the gasification system 1, The vertical conveying path corresponds to the vertical conveying path 50, The discharge pipe corresponds to discharge pipe 12; The longitudinal screw flight corresponds to the longitudinal screw flight 52, The upstream conveying path corresponds to the upstream conveying pipe 41, The upstream screw flight corresponds to the upstream screw flight 43, The injection part corresponds to the gasifying agent supply pipe 13, The conveyance amount control unit corresponds to the rotation control unit 73. The storage amount detection part corresponds to the storage amount detection sensor 16, The temperature detection part corresponds to the temperature sensor 15, The analysis unit corresponds to the gas analyzer 72, The small diameter portion corresponds to the tip side discharge pipe 12c, The ash discharge section corresponds to the ash discharge section 17, The present invention is not limited to the configurations of the above-described embodiments, and many other embodiments can be obtained.

[0113] For example, in this embodiment, the vertical transport path 50 is installed in a vertical direction (up and down direction) relative to the reaction tower 11, but it does not have to be perfectly aligned vertically. For example, the vertical transport path 50 may be inclined at about ±30 degrees relative to the vertical direction.

[0114] In addition, in this embodiment, the intermediate conveying pipe 42 and the vertical conveying pipe 51 are perpendicular to each other at the connecting portion, but they do not necessarily have to be perpendicular to each other, as long as the intermediate conveying pipe 42 and the vertical conveying pipe 51 intersect. Furthermore, the upstream conveying pipe 41 may be arranged in a direction that intersects the vertical direction, for example, along the horizontal direction, and further, the upstream conveying pipe 41 and the vertical conveying pipe 51 may be directly connected to each other.

[0115] Furthermore, the vertical conveying path 50 may have any configuration as long as the vertical screw blades 52 can convey upward the semi-carbonized wood chips S accumulated below the reaction tower 11. For example, the vertical conveying path 50 may have a partial opening formed in the vertical conveying pipe 51 extending upward inside the reaction tower 11, and the vertical screw blades 52 may be partially exposed through this opening.

[0116] In addition, although air and water vapor are used as the gasifying agent in this embodiment, the gasifying agent is not particularly limited as long as it promotes the gasification of the semi-carbonized wood chips S. Therefore, for example, in addition to a gas such as oxygen, other gases, powders, liquids, etc. may also be used.

[0117] Furthermore, the rotation control unit 73 may control the amount of semi-carbonized wood chips S transported based on, for example, the accumulation amount and density of the semi-carbonized wood chips S fed into the reaction tower 11, the temperature inside the reaction tower 11, the components of the released gas, etc., or a combination of these.

[0118] Furthermore, the upstream screw blade 43 is configured to extend along the upstream conveying pipe 41 and the intermediate conveying pipe 42 from the upper end of the upstream conveying pipe 41 to the tip of the intermediate conveying pipe 42. However, this configuration is not limited to this, and for example, a so-called screw feeder that can rotate around an axis extending in the vertical direction may be provided inside the upstream conveying pipe 41, and a so-called spring conveyor blade such as the upstream screw blade 43 that can transmit the rotation of the screw feeder provided inside the upstream conveying pipe 41 may be provided inside the curved intermediate conveying pipe 42. [Explanation of symbols]

[0119] 1. Gasification system 11 Reaction tower 12 Release tube 12c Distal discharge tube 13 Gasifying agent supply pipe 15 Temperature Sensor 16 Savings amount detection sensor 17 Ash discharge section 20. Conveyor 40 Upstream transport path 43 Upstream screw blade 50 Vertical conveying path 52 longitudinal screw blades 72 Gas analyzer 73 Rotation control section S Semi-carbonized wood chips

Claims

1. A gasification apparatus for gasifying wood chips, comprising an input mechanism for inputting semi-carbonized wood chips and a reaction tower for gasifying the wood chips, The input mechanism includes: a vertical tubular longitudinal conveying path for conveying the wood chips from the bottom of the reaction tower to the inside thereof; The reaction column contains A discharge pipe for discharging gas generated from the wood chips is provided at the top, an injection section for injecting a gasifying agent into the reaction tower; The longitudinal conveying path is A longitudinal screw blade is provided inside the pipe, the longitudinal screw blade being formed in a spiral shape along a vertical direction and rotatable about an axis along the vertical direction as a rotation axis; The vertical screw blades are exposed above the bottom of the reaction tower so as to circulate the wood chips that have fallen to the bottom of the reaction tower without being gasified, The injection section The reaction tower is provided with a first injection port provided at the bottom thereof and a second injection port provided at the side of the central portion thereof. Gasifier.

2. The first injection part is The screw blade is provided at the center of the rotation shaft of the vertical screw blade installed in the vertical conveying path, The gasifying agent is supplied upward along the longitudinal direction of the vertical transport path. The gasifier of claim 1 .

3. When the wood chips are gasified, three layers are formed in the reaction tower from bottom to top in this order: a pyrolysis zone for pyrolyzing the wood chips, a combustion zone for burning the pyrolyzed wood chips, and a reduction zone for generating the gas; The second injection section is disposed at a position corresponding to the reduction zone on the side surface of the central portion of the reaction tower. The gasification apparatus according to claim 1 or 2.

4. The discharge pipe is configured so that a negative pressure is created at a tip side thereof, When the tip side of the discharge pipe becomes negative pressure, the gasifying agent is injected into the reaction tower from the first injection part and the second injection part. A gasification apparatus according to any one of claims 1 to 3.

5. The discharge pipe is provided with a narrow diameter portion at the tip end thereof, the diameter of which is smaller than that of the base end side thereof, and is provided with an aspirator at the tip end thereof for aspirating the generated gas. A gasification apparatus according to any one of claims 1 to 4.

6. The longitudinal conveying path is a tubular vertical conveying pipe that is erected along the vertical direction and connected to an insertion hole provided at the bottom of the reaction tower; The vertical screw blade is installed inside the vertical conveying pipe, The longitudinal screw flights are The wood chips that have fallen to the bottom of the reaction tower without being gasified are circulated through the vertical transport pipe, and the vertical transport pipe is exposed above the bottom of the reaction tower. A gasification apparatus according to any one of claims 1 to 5.

7. The input mechanism includes: An inlet for feeding the wood chips is provided at one end, and a tubular upstream conveying path is provided at the other end, the upstream conveying path being connected in a direction intersecting the longitudinal conveying path, The upstream conveying path is An upstream screw blade is provided inside the pipe, which is spirally formed and rotates to transport the wood chips toward the vertical conveying path. A gasification apparatus according to any one of claims 1 to 6.

8. A conveyance amount control unit is provided that controls the rotation speed of the vertical screw blades and adjusts the conveyance amount of the wood chips conveyed to the reaction tower. A gasification apparatus according to any one of claims 1 to 7.

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