JP2016074799A - Apparatus for gasifying woody biomass, and power-generating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasifying apparatus that eliminates the crosslinking phenomenon of woody biomass within a fixed-bed downdraft-type gasification furnace; and to provide a power-generating apparatus using the same.SOLUTION: A gasifying apparatus 1 gasifies woody biomass 2 using a fixed-bed downdraft-type gasification furnace, the gasification device comprising: a dividing plate 20 which divides the interior of the gasification furnace 10 into an upper reservoir section 11 and a lower reaction section 12 and which is provided with a through-hole 13 that connects the reservoir section and the reaction section; and a fire grate 30 disposed in the lower part of the reaction section. The gasification device is characterized in that the cross-sectional area in a horizontal plane of the reaction section gradually increases going downward. By gradually increasing the cross-sectional area in a horizontal plane of the reaction section going downward, the reaction section is given a so-called "wide-bottom" shape. Because reactive force primarily acts in a diagonally downward direction on particles of woody biomass in contact with the furnace wall, the particles are prone to slide downward from the wall surface, and the wall surface is not prone to become a foundation (scaffold), thereby preventing the occurrence of the crosslinking phenomenon.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a woody biomass gasification device and a power generation device, and more particularly to a gasification device that eliminates the cross-linking phenomenon of woody biomass inside a fixed-bed downdraft gasification furnace and a power generation device using this gasification device. .

Woody biomass has carbon-neutral properties that do not affect the carbon dioxide concentration in the atmosphere. By converting this to high-temperature gas and using it as a fuel for power generation, it becomes a substitute for fossil fuel and prevents global warming. It has been attracting attention recently because it can contribute to
Woody biomass includes thinned wood, unused wood left over from the forest, unused wood from bark, backboard, sawdust, etc. generated from sawmills, and construction waste generated at the time of dismantling construction sites and houses Etc.

The gasifier generates flammable gas by partially oxidizing woody biomass. It is a fixed bed type, a bubbling type, a fluidized bed type such as a circulation type, a jet type such as a fine powder type, or an internal combustion type rotary kiln type. The thing using many types of gasification furnaces, such as rotary kiln types, such as a fuel type rotary kiln system, is already known (refer nonpatent literature 1).
Among these gasifiers, the fixed-bed type has the advantages of a small capacity of about 1,000 KW / less thermal output, a low capital investment, a small installation area, and a short startup and shutdown.
There are two types of fixed bed types: downdraft type in which woody biomass and gasifying agent flow in the same direction and updraft type in which the generated gas flows in the opposite direction, but when the generated combustible gas is used as a fuel for internal combustion engines or power generation A downdraft type that can keep the tar content in the gas low is preferred.

A typical example of a fixed-bed downdraft gasifier is the Imbert system, which produced 1 million units during World War II. Most gasifiers currently in operation are partially modified from this invert system and share the same basic operating principle. For example, as shown in Fig. 5-2 of Non-Patent Document 2 and Fig. 2 of Patent Document 1, the invert type gasifier is vertical to guide the air as the gasifying agent to the high temperature part in the center of the gasifier. The middle part of the cylindrical gasification furnace is formed in a funnel shape narrowed in the radial direction.
When wood biomass is introduced into the gasification furnace and air is introduced and burned, the wood biomass is first converted into CH ₄ , CO, CO ₂ , in the pyrolysis layer (200-600 ° C) formed at the top of the furnace. Thermally decomposed into H ₂ , H ₂ O, C (char (solid)), tar, ash (solid), etc. Under the thermal decomposition layer has a combustion layer (600～1,300 ° C.) is formed, where C is a flammable material, tar, H2, CO or the like is CO, are partial combustion (oxidation) to CO _2, H ₂ O, etc. The A reduction layer (600-800 ° C) is formed under the combustion layer, where C reacts with CO ₂ or H ₂ O, or CH ₄ reacts with H ₂ O, so that CO, H ₂ etc. Combustible gas is generated. The combustible gas is discharged out of the furnace through a grate below the reducing layer and used for power generation and the like.
Moreover, since the volume of woody biomass decreases as it burns, a new woody biomass is supplied from above and moved downward using its own weight.
Although a gasification furnace having a simple cylindrical shape without a restriction has been developed, it is the same as the above-described invert gasification apparatus in that the downward movement of the woody biomass depends on gravity.

JP 2008-81637 A

Published by Industrial Research Council “Chemical Equipment” 2004.03. “Biomass Conversion Technology” by Katsuo Shiroko T.B. Reed and A. Das Handbook of Biomass Downdraft Gasifier EngineSystems. P30

However, the above prior art has the following problems.
That is, when the gasification furnace has a funnel shape or a simple cylindrical shape, due to the horizontal component of the pressure caused by the weight of the woody biomass, a frictional force parallel to the furnace wall is generated, resulting in the woody biomass particles being It gets caught on the furnace wall. Moreover, since the wood biomass particles are generally complicated in shape, a large frictional force is generated between adjacent particles.
Therefore, when the burning woody biomass moves downward in the gasification furnace, an arch is formed by the particles supporting each other while using a part of the furnace wall as a foundation (scaffold) by the frictional force. There is.
Furthermore, if the load of wood biomass above the arch acts on the entire arch when the wood biomass below the arch moves downward due to the movement of the wood biomass below the arch, the compressive stress acting inside the arch increases. There is a problem that a so-called cross-linking phenomenon occurs and woody biomass cannot be supplied.
Further, when the cross-linking phenomenon occurs, there is a problem that the reaction layer composed of the thermal decomposition layer, the combustion layer, and the reduction layer is consolidated, and the downward flow of air / gas is hindered.
In addition, the cross-linking phenomenon may occur based on the furnace bottom as well as the furnace wall.

In order to eliminate such a cross-linking phenomenon, a technique for destroying the arch by inserting a stirrer or the like in the furnace is known, but there is a problem that the stable state of the reaction layer is disturbed, and a stirrer is attached to a high temperature part. Therefore, there is a problem that costs are increased.
In addition, a technique is known in which an impact or vibration is applied to the arch by hitting it with a hammer or the like from the outside of the gasification furnace. However, there is a problem in that the degree of consolidation is strengthened and the arch may become stronger. there were.

  In view of such problems, the present invention provides a gasifier that eliminates the cross-linking phenomenon of woody biomass inside a fixed-bed downdraft gasifier and a power generator that uses the gasifier. Objective.

The gasification apparatus of the present invention gasifies woody biomass using a fixed-bed downdraft gasification furnace, and partitions the interior of the gasification furnace into an upper storage part and a lower reaction part, and these A partition plate having a through-hole that connects the storage unit and the reaction unit, and a grate disposed at a lower part of the reaction unit, the cross-sectional area in the horizontal plane of the reaction unit gradually increases downward It is characterized by that.
Further, the grate swings.
Moreover, the said through-hole is provided in the center part of the width direction of the said partition plate, It is provided with the rotary blade which scrapes the woody biomass in the said storage part in the said center part.
Further, the gasifying agent is introduced into the reaction section through the inside of a rotating shaft that rotates the rotary blade.
Further, the gasifying agent is introduced from a plurality of locations in the reaction section.
The power generator according to the present invention is characterized by being driven using the combustible gas generated by the gasifier.

As described above, when the gasification furnace has a funnel shape or a simple cylindrical shape, a frictional force acts on the wood biomass particles in contact with the furnace wall, so that a crosslinking phenomenon based on the furnace wall is likely to occur.
However, in the present invention, the cross-sectional area of the reaction part in the horizontal plane is gradually increased downward, so that the reaction part has a so-called divergent shape. In this case, the frictional force is unlikely to act on the woody biomass particles in contact with the furnace wall, and the furnace wall is less likely to be a foundation (scaffold), so that the occurrence of a crosslinking phenomenon can be suppressed.
Furthermore, in this invention, a partition plate is provided and the woody biomass in a storage part is supplied to a reaction part through a through-hole. That is, only the amount of woody biomass necessary for combustion is supplied to the reaction unit, and the remaining woody biomass is kept in the storage unit. As a result, the partition plate receives the load of the woody biomass in the reservoir, so even if an arch is about to be formed, the load acting on the arch (the weight of the woody biomass above) is reduced compared to the conventional case. Therefore, the cross-linking phenomenon can be made less likely to occur.

In addition, as a result of the suppression of the cross-linking phenomenon, the reaction layer is less likely to be consolidated, and the air / gas can be smoothly distributed downward, and the reaction layer is maintained in a stable state, and the combustible gas is reduced. The effect that it can produce | generate stably is acquired.
Further, it is not necessary to add a stirrer or the like for eliminating the cross-linking phenomenon, and the cost can be suppressed.
In addition, if the grate is moved, the reaction layer on the grate is also moved, so that the foundation formed on the furnace wall and the grate (furnace bottom) can be destroyed to suppress the occurrence of the bridging phenomenon.

As described above, in the partial oxidation type fixed bed gasification furnace as in the present invention, the layer sequence of the reaction layer is generally said to be a pyrolysis layer, an oxidation layer, and a reduction layer from the top.
Unlike the method of applying heat in the absence of oxygen such as kilns, the pyrolysis layer in the fixed bed method is heated by radiant heat from the surrounding flame in an oxygen-existing atmosphere. Sometimes written.
When the oxygen layer is depleted of oxygen in the gas, if there is a reducing agent such as char on the spot, and if the energy to cover the endothermic reaction is present in a high temperature form, the reduction reaction takes place and the reduction layer is formed. .

If the reduced layer can maintain a high temperature state to the lower part, it will be in direct contact with the grate, but if the temperature is lowered at the lower part, the reduction reaction will not be performed (or the reaction rate will be significantly reduced). Change to reaction layer.
That is, in a normal fixed bed gasification furnace, when the reducing layer is in direct contact with the grate, the energy that should increase the calorific value of the combustible gas is dissipated as sensible heat of the gas, so it is necessary to avoid it. One means for this is to limit the supply amount of the oxidizing agent.
On the other hand, when there is too little supply of an oxidizing agent, a non-reactive layer will grow. In extreme terms, the former says that the furnace becomes a stove, and the latter says that the furnace becomes a charcoal kiln. One of the roles of the grate is to remove unnecessarily grown unreacted layers from the reactor.
In the reaction layer, all layers are consumed by the progress of the reaction, the volume is reduced, and the ventilation between the particles is maintained. In the unreacted layer, the volume is maintained as it is, and the particles consumed in the upper reaction layer fill the space in the unreacted layer and become clogged. Another role of the grate is to eliminate the clogged unreacted layer and regenerate the ventilation. The effect of suppressing the clogging can be obtained by collapsing the grate as in the present invention to collapse the unreacted layer.

Moreover, when supplying wooden biomass to a reaction part through the through-hole provided in the partition plate, the case where it is difficult to drop wooden biomass naturally from a through-hole only with dead weight is assumed. Therefore, if it is provided with the rotary blade that scrapes the woody biomass in the storage part into the central part, the woody biomass in the storage part can be reliably supplied to the reaction part through the through hole without waste.
In addition, if the gasifying agent is introduced into the reaction section through the inside of the rotating shaft that rotates the rotating blade, it is not necessary to separately provide an air supply opening in the gasification furnace, which contributes to cost reduction.
Further, if air is introduced from a plurality of locations in the reaction section, the gas temperature at the reducing layer inlet can be maintained at a high temperature, and tar in the gas can be decomposed.
According to the power generation device of the present invention, power is generated by driving the engine using at least a part of the combustible gas derived from woody biomass as a fuel, so that it can contribute to the prevention of global warming as an alternative to fossil fuel.

A longitudinal sectional view showing the structure of the gasifier (a) and A-A 'arrow view (b) Plan view showing rotating blades and rotating shaft Plan view (a), front view (b), side view (c), bottom view (d) and perspective view (e) showing the structure of the swing mechanism Block diagram showing structure of power generator The graph which shows the temperature change in the gasifier during combustion in an Example

An embodiment of the gasifier 1 of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the gasifier 1 includes a gasification furnace 10, a partition plate 20, a grate 30, and rotary blades 40.
The gasification furnace 10 generates combustible gas G from the woody biomass 2 by a fixed bed downdraft method.
The partition plate 20 is provided to partition the inside of the gasification furnace 10 into an upper storage portion 11 and a lower reaction portion 12, and a through-hole that connects the storage portion 11 and the reaction portion 12 in the center in the width direction. A hole 13 is provided.
The storage part 11 is a cylindrical member whose upper part is closed, and is provided for storing the woody biomass 2 therein. The upper part of the storage part 11 is provided with a wood biomass inlet 15 that can be opened and closed by a lid 14, and a level meter for monitoring the amount of the wooden biomass 2 stored therein is provided at a plurality of locations on the side of the storage part 11. A nozzle (not shown) for mounting is provided.

An operator inputs a required amount of the woody biomass 2 from the woody biomass inlet 15 and bolts it with a lid 14 to keep the gasification furnace 10 sealed. Note that well-known fuel input means such as a rotary valve may be used regardless of the manual work of the operator. In this case, the amount of the woody biomass 2 in the storage unit 11 is adjusted so as to be within a predetermined range. What is necessary is just to set the drive of a fuel injection | throwing-in means by the control system using a level meter so that the biomass 2 may be injected | thrown-in at an appropriate time interval.
Wood biomass 2 includes chips, sawdust (including extremely small chips), pellets, etc., but wood biomass 2 has variations in grain shape, moisture, and bulk density, and sawdust (including extremely small chips). ), The variation becomes remarkable. Therefore, it is preferable to use chips and pellets from the viewpoint of stably driving the power generation apparatus 100 for a long period of time. The pellet is generally cylindrical with a diameter of about 6 to 10 mm and a length of about 10 to 25 mm.

The reaction unit 12 forms a reaction layer L composed of a pyrolysis layer L1, a combustion layer L2, and a reduction layer L3 in order from above by partially oxidizing the woody biomass 2 sequentially supplied from the through-hole 13, and combustible gas G Is provided to generate
The reaction unit 12 is formed to be widened so that the cross-sectional area in the horizontal plane gradually increases downward, the upper part thereof is partially shielded by the partition plate 20, and the grate 30 is disposed below the upper part. ing. That is, the grate 30 becomes the bottom (furnace bottom) of the reaction unit 12.
The cross-sectional shape of the reaction part 12 includes a circular shape (cylindrical shape) and a rectangular shape, but a circular shape is preferable from the viewpoint of suppressing the frictional force generated on the wall surface. Moreover, the effect of suppressing the frictional force increases as the inclination of the wall surface (inclination angle with respect to the vertical surface) increases, but on the other hand, there is a possibility that the gas flow in the reaction unit 12 may be biased, so about 5 to 10%. preferable.

The grate 30 functions as the bottom of the reaction unit 12 by being disposed below the reaction unit 12 as described above. That is, among the reaction layers L formed in the reaction section 12, the reduction layer L3 is formed on the upper surface of the grate 30 with a certain unreacted layer, and combustibility generated from the reduction layer L3. The gas G passes through the grate 30 and is taken out to the outside. After the impurities are filtered by a tar removing device and an ash content collecting device as necessary, the gas G is sent to a gas mixer.
As the tar removing device, for example, a device similar to a commonly used one such as one using a Ni-based catalyst or activated carbon can be used.
As the ash content recovery device, for example, a device similar to a commonly used one such as a glass fiber or a bag filter made of a metal mesh can be used. Further, ash may be removed by passing the generated combustible gas G through a scrubber filled with water or oil.

Further, as shown in FIG. 3, the present embodiment includes a peristaltic mechanism 50 for peristating the grate 30. Specifically, a plurality of disc cams 51 and camshafts 52 (two in the present embodiment) that contact the lower surface of the grate 30 are arranged, and the camshaft 52 is rotated around the axis so that the discs are rotated. The cam 51 is rotated to swing the grate 30 (in this embodiment, up and down) (see the arrow in FIG. 3C). By generating the grate 30 and destroying the foundation of the woody biomass 2 on the furnace wall and bottom, it is possible to prevent the cross-linking phenomenon and move the woody biomass 2 stably downward.
In addition, although the timing which rocks the grate 30 changes with the capacity | capacitances, etc. of the gasifier 10, about once every 2 minutes-0.5 minute is preferable.
Further, from the viewpoint of preventing the occurrence of the cross-linking phenomenon, it is preferable to move the grate 30 in the vertical direction. However, if the grate 30 is vigorously moved up and down, the stable state of the reaction layer L may be lost. It may be moved in a direction or in an oblique direction.

The rotary blade 40 is provided to scrape the woody biomass 2 in the storage part 11 to the center part of the partition plate 20 and drop it into the reaction part 12 from the through hole 13.
Specifically, as shown in FIG. 2, the rotary blade 40 is formed by bending a metal rod into a spiral shape in a plane, and is attached to two upper and lower portions of the lower end of the rotary shaft 41. The shape of the rotary blade 40 is not particularly limited, and may be, for example, a three-dimensional chordal shape that gradually increases in diameter downward, an L-order shape, a rod shape, or the like. Moreover, a part of the longitudinal direction may be bent or protrude upward or downward.
Further, the rotary blade 40 is not necessarily formed of a metal rod, and a metal plate may be cut and bent, or only one or three or more may be attached to the rotary shaft 41.
The rotating shaft 41 is supported on the upper portion of the storage portion 11 by a known means such as a ball bearing so as to be rotatable around the axis.
When the rotating shaft 41 is driven while the woody biomass 2 is stored in the storage unit 11, the rotary blade 40 rotates, and the woody biomass 2 is scraped to the center, and reliably falls into the reaction unit 12 from the through hole 13 It is a mechanism to do.

In the present embodiment, air Air as a gasifying agent is introduced into the upper portion of the reaction unit 12 through the inside of the rotating shaft 41. Specifically, the rotary shaft 41 has a hollow structure, and a blower outlet 42 is provided on the lower surface of the tip.
In the present embodiment, a plurality of air introduction paths 60 (two in the present embodiment) that penetrate the side surface of the gasification furnace 10 and connect to the lower surface of the partition plate 20 are provided. It can be changed as appropriate. The air that has passed through the air introduction path 60 is ejected from the air outlet 60a (see FIG. 1B) to the lower space S of the partition plate 20. Reference numeral 61 in FIG. 1 (b) is a secondary air introduction path for introducing secondary air into the reaction section 12, and reference numeral 61a in FIG. 1 (a) is a secondary air outlet. It is.
Supply of gas / air into the gasification furnace 10 via the rotary shaft 41 and the air introduction path 60 may be performed by using a well-known means such as a fan or an air compressor (not shown), or by the power generation engine 102. Natural suction may be performed in the gasification furnace 10 by utilizing the negative pressure in the gasification furnace 10 due to suction. Further, a damper (not shown) may be provided on the rotary shaft 41 or the air introduction path 60 so that the air supply amount can be adjusted.
In the present invention, the air introduction path 60 is not essential. For example, air may be introduced using the rotating shaft 41. Further, the air outlet 42 is not essential, and air may be introduced using the air introduction path 60, for example.
In this way, the gasifying agent is introduced from the upper part of the reaction part 12 through the rotating shaft 41 and the air is introduced from the lower part of the storage part 11 through the air introduction path 60, thereby combustible gas by a fixed bed downdraft type. A sufficient amount of gas and air necessary to generate G can be supplied. In addition to air, oxygen, water vapor, or the like may be used as the gasifying agent.

Next, the power generator 100 using the gasifier 1 of the present invention will be described.
The power generation device 100 drives the combustible gas G generated by the gasification device 1 as at least a part of the fuel, and as shown in FIG. 4, from the gasification device 1, the gas mixer 101, the engine 102, and the generator 103. Outlined.
The gas mixer 101 is provided to mix the combustible gas G from which impurities have been removed by passing through a tar removing device or an ash content collecting device with the air outside the device, if necessary. The gas mixer 101 mixes an appropriate amount of air with the combustible gas G based on the data relating to the component ratio of CO, H ₂ , CH _4, etc. in the combustible gas G measured in advance, and supplies the air-fuel mixture to the engine 102.
As the engine 102, for example, a gas engine 102 driven by a combustible gas G alone or a diesel engine 102 that can be driven by both the combustible gas G and biodiesel fuel can be used. When the combustible gas G is used, a waiting time of about 30 minutes is required from the start until the generator 103 can be driven. Therefore, it is preferable to use the diesel engine 102 that can be driven by biodiesel fuel because the waiting time can be shortened.
The generator 103 is connected to the engine 102, and power is generated by driving the engine 102. The generator 103 can be the same as that normally used. Driving of various devices such as the fuel supply means and the engine 102 constituting the generator 103 may be performed by automatic control by a computer, but may be manually performed by an operator.

Next, operations of the gasification apparatus 1 and the power generation apparatus 100 of the woody biomass 2 of the present invention will be described, but detailed description is omitted because the ignition operation may be performed using a known method.
First, the operator inputs the woody biomass 2 from the woody biomass inlet 15 and deposits the woody biomass 2 to a predetermined height in the storage unit 11 according to the level meter instruction. At the same time, the rotary blade 40 is driven to scrape the woody biomass 2 at the center of the partition plate 20 and drop it into the reaction part 12 from the through hole 13.
The woody biomass 2 in the reaction unit 12 ignited by a well-known method is oxidized by the air supplied through the outlet 42 of the rotating shaft 41 and the air introduction path 60, and when the reaction layer L is constructed, it is combustible. Generation of gas G is started. During this time, the peristaltic mechanism 50 is driven to perturb the grate 30 at appropriate intervals.
The combustible gas G generated in the reaction section 12 is formed by mixing impurities with a combustible gas G after reaching impurities to the gas mixer 101 after impurities are removed by a tar removing device and an ash recovery device as required. The air-fuel mixture is supplied to the engine 102 and the generator 103 generates power.

Next, an embodiment of the power generator 100 of the present invention will be described.
Since the situation inside the gasifier 10 is confirmed by the time transition of temperature, thermocouples were installed below the storage unit 11 (near the lower surface of the partition plate 20) and at the upper, middle, and lower stages of the reaction unit 12. . Among them, the upper, middle and lower thermocouples of the reaction section 12 were installed in the vicinity of the furnace wall. In addition to these four locations, a thermocouple capable of moving the measurement position was inserted from the bottom of the reaction section 12, and the measurement location was the center of the middle stage or the center of the lower stage, and was moved as necessary.

FIG. 5 shows the temperature measurement results by each thermocouple.
When the vicinity of the grate 30 is ignited, the temperature inside the gasifier 10 gradually increases. If the temperature in the middle stage exceeds 800 ° C., it can be determined that combustible gas G is generated. Thereafter, when the temperature reaches 600 ° C. in the upper stage of the reaction section 12, it can be determined that the reaction layer L has grown to that site. The grate 30 is perturbed by a peristaltic mechanism 50 at appropriate time intervals.
When the secondary air is introduced through the secondary air introduction path 61 and the outlet 61a from about 50 mm above the middle thermocouple, the maximum temperature is reached by an intense oxidation reaction. Thereafter, the temperature of the gas slightly decreases due to the reduction reaction, passes through the grate 30 and goes out of the furnace.
In the present embodiment, no cross-linking phenomenon occurs in the woody biomass 2, and there is no sudden temperature change in the pyrolysis layer L1, the combustion layer L2, and the reduction layer L3 constituting the reaction layer L, and the temperature is always at an appropriate temperature. Was able to be maintained. As a result, high-quality combustible gas G with a low tar concentration can be stably generated, and stable electric power can be obtained by introducing it to the engine 102 and the generator 103.

  The present invention relates to a gasification device that eliminates the cross-linking phenomenon of woody biomass inside a fixed-bed downdraft gasification furnace and a power generation device that uses this gasification device, and has industrial applicability.

Air
G Combustible gas
L reaction layer
L1 pyrolysis layer
L2 combustion layer
L3 reduction layer
S Lower space
1 Gasifier
2 Woody biomass
10 Gasifier
11 Reservoir
12 reaction section
13 Through hole
14 Lid
15 Wood biomass inlet
20 Partition
30 grate
40 rotating blades
41 Rotation axis
42 Air outlet
50 Peristaltic mechanism
51 disc cam
52 Camshaft
60 Air introduction path
60a outlet
61 Secondary air introduction path
61a outlet
100 power generator
101 gas mixer
102 engine
103 generator

Claims (6)

In a gasifier that gasifies woody biomass using a fixed-bed downdraft gasifier,
Partitioning the inside of the gasification furnace into an upper storage part and a lower reaction part, and a partition plate having a through hole connecting the storage part and the reaction part, and a grate disposed at the lower part of the reaction part With
A gasifier, wherein a cross-sectional area of the reaction portion in a horizontal plane gradually increases downward.   2. The gasifier according to claim 1, wherein the grate swings.   3. The gas according to claim 1, wherein the through hole is provided in a central portion in the width direction of the partition plate, and includes a rotary blade that scrapes the woody biomass in the storage portion into the central portion. Device.   4. The gasifier according to claim 3, wherein the gasifying agent is introduced into the reaction section through the inside of a rotating shaft that rotates the rotary blade.   The gasifier according to any one of claims 1 to 4, wherein a gasifying agent is introduced from a plurality of locations of the reaction section. 6. A power generator that is driven by using a combustible gas generated by the gasifier according to any one of claims 1 to 5.

Images