Biomass fuel production system and liquid fuel recovery device

Abstract

To provide a device with improved recovery rate.SOLUTION: A biomass fuel production system comprises: a heating device that heats woody biomass to decompose it into decomposition gas and solid fuel; and a recovery device that cools the decomposition gas generated by the heating device to recover liquid fuel from the decomposition gas. The recovery device comprises: one or more recovery tanks that form a space through which decomposition gas flows; a gas cooling part that brings cooling liquid into contact with the decomposition gas inside a first recovery tank, into which the decomposition gas from the heating device is first introduced, among the one or more recovery tanks; and a shielding member positioned in a flow path of post-cooling fluid containing decomposition gas after being cooled by the cooling liquid, such that the post-cooling fluid impinges on the shielding member, inside any one of the one or more recovery tanks.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a biomass fuel production system and a liquid fuel recovery device.

Background Art

[0002] From the perspective of preventing global warming or forming a recycling-oriented society, under the concept of carbon neutrality, the movement to expand the utilization of biomass has been actively developing. For example, as a method of fuelizing woody biomass, a method is known in which woody biomass is rapidly heated and pyrolyzed rapidly, and the gas obtained by pyrolysis is cooled to recover oil components as liquid fuel (see, for example, Patent Documents 1 to 4). The carbide after pyrolysis of woody biomass can be used as solid fuel.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure provides a biomass fuel production system and a liquid fuel recovery device useful for improving the recovery rate.

Means for Solving the Problems

[0005] [1] A heating device that heats woody biomass and decomposes it into decomposition gas and solid fuel, and a recovery device that cools the decomposition gas generated by the heating device and recovers liquid fuel from the decomposition gas. The recovery device includes one or more recovery tanks that form a space through which the decomposition gas flows, and in the first recovery tank, which is the first of the one or more recovery tanks into which the decomposition gas from the heating device is first introduced, a gas cooling section that brings a cooling liquid into contact with the decomposition gas, and in any one of the one or more recovery tanks, a shielding member installed on the flow path through which the cooled fluid containing the decomposition gas cooled by the cooling liquid flows so that the cooled fluid hits it. A biomass fuel production system.

[0006] [2] The one or more recovery tanks include the first recovery tank and a second recovery tank adjacent to the first recovery tank. The shielding member is installed in the second recovery tank on the flow path through which the cooled fluid introduced from the first recovery tank to the second recovery tank flows so that the cooled fluid hits it. The biomass fuel production system according to [1] above.

[0007] [3] The second recovery tank includes a second inlet for introducing the cooled fluid from the first recovery tank. The shielding member includes a facing surface facing the second inlet. When viewed from a direction orthogonal to the second inlet, the facing surface covers the entire area of the second inlet. The biomass fuel production system according to [2] above.

[0008] [4] The second recovery tank further includes a container body that forms an internal space and a second outlet for discharging the cooled fluid outside the second recovery tank. The shielding member further includes a guide surface that connects one end of the facing surface closer to the second outlet and the container body. The biomass fuel production system according to [3] above.

[0009] [5] The recovery device further includes a first extraction pipe for extracting the liquid fuel generated inside the first recovery tank, a second extraction pipe for extracting the liquid fuel generated inside the second recovery tank, and an opening / closing member capable of changing the opening degree of the flow path inside the second extraction pipe. The biomass fuel production system according to any one of [2] to [4] above.

[0010] [6] The recovery device further includes a circulation device that cools the liquid fuel extracted from the one or more recovery tanks and introduces the cooled liquid fuel into the gas cooling unit. The biomass fuel production system according to any one of [1] to [5] above.

[0011] [7] The first recovery tank includes a first inlet for introducing decomposition gas into the first recovery tank from the upper end of the first recovery tank, and an inner cylinder pipe formed to extend downward from the first inlet and guiding the decomposition gas to the inside of the first recovery tank. The biomass fuel production system according to any one of [1] to [6] above.

[0012] [8] The heating device has an externally heated kiln that heats the woody biomass using heat from the outside. The production system further includes a combustion furnace that burns the cooled fluid after being discharged from the recovery device to generate combustion gas for heating the kiln. The biomass fuel production system according to any one of [1] to [7] above.

[0013] [9] The biomass fuel production system according to any one of [1] to [7] above further includes a drying device for drying the woody biomass before being supplied to the heating device.

[0014]

[10] The heating device has an externally heated kiln that heats the woody biomass using external heat. The manufacturing system further includes a combustion furnace that burns the cooled fluid after it is discharged from the recovery device to generate combustion gas for heating the kiln. When drying the woody biomass before it is supplied to the heating device, the drying device utilizes the gas derived from the combustion gas generated in the combustion furnace. The manufacturing system for biomass fuel according to [9] above.

[0015]

[11] A recovery device that cools the decomposition gas generated in a heating device that heats woody biomass to decompose it into decomposition gas and solid fuel, and recovers liquid fuel from the decomposition gas. The recovery device includes one or more recovery tanks that form a space through which the decomposition gas flows, and in the first recovery tank into which the decomposition gas from the heating device is first introduced among the one or more recovery tanks, a gas cooling unit that brings a cooling liquid into contact with the decomposition gas, and a shielding member installed on the flow path through which the cooled fluid containing the decomposition gas after being cooled by the cooling liquid flows in any of the one or more recovery tanks so that the cooled fluid hits it. A recovery device for liquid fuel.

Effects of the Invention

[0016] According to the present disclosure, there are provided a manufacturing system for biomass fuel useful for improving the recovery rate, and a recovery device for liquid fuel.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment will be described with reference to the drawings. In the description, the same reference numerals are given to the same elements or elements having the same function, and redundant descriptions are omitted.

[0019] [BIOMASS FUEL MANUFACTURING SYSTEM] FIG. 1 schematically shows a biomass fuel manufacturing system according to an embodiment. The manufacturing system 1 (biomass fuel manufacturing system) shown in FIG. 1 is a system for manufacturing fuel from woody biomass. The manufacturing system 1 performs at least decomposing woody biomass by heating it into decomposition gas and solid fuel, and cooling the decomposition gas to generate liquid fuel. In the present disclosure, the solid fuel and liquid fuel obtained by fuelizing woody biomass are collectively referred to as "biomass fuel". That is, biomass fuel means solid fuel, liquid fuel, or both solid fuel and liquid fuel.

[0020] The raw material of the biomass fuel manufactured by the manufacturing system 1 is woody biomass. The woody biomass may be at least one of wood chips and waste wood that has been ground. Examples of woody biomass include construction waste wood, forest residues, residues from sawmills, palm husks, rice husks, rice straw, wheat straw, feed, waste paper, etc. or crushed materials thereof. The woody biomass may contain crushed materials of at least one of construction waste wood and forest residues.

[0021] The manufacturing system 1 includes, for example, a pulverizing device 10, a drying device 20, a heating device 30, a recovery device 40, and a combustion furnace 190. The pulverizing device 10 is a device for obtaining woody biomass Wb by pulverizing at least one of wood chips and waste wood. The pulverizing device 10 sends the woody biomass Wb to the drying device 20.

[0022] The drying device 20 is a device that dries the woody biomass Wb before it is supplied to the heating device 30. The moisture content per unit volume of the woody biomass Wb after drying by the drying device 20 is less than the moisture content per unit volume of the woody biomass Wb before drying by the drying device 20. When drying the woody biomass Wb before it is supplied to the heating device 30, the drying device 20 may utilize the gas derived from the combustion gas G1 generated in the combustion furnace 190. The combustion gas, G1, and the gas derived from the combustion gas G1 will be described later. The drying device 20 sends the dried woody biomass Wb to the heating device 30.

[0023] The heating device 30 heats the woody biomass Wb and decomposes it into decomposition gas and solid fuel. The decomposition gas generated by heating the woody biomass Wb is hereinafter referred to as "decomposition gas Gd". In one example, the heating device 30 includes a feeder 32, a rotary kiln 34, a heating unit 36, and a discharge unit 38.

[0024] The feeder 32 supplies the woody biomass Wb inside the rotary kiln 34. The feeder 32 includes, for example, a screw conveyor or the like. The feeder 32 supplies the woody biomass Wb into the rotary kiln 34 from the upstream end of the rotary kiln 34 at a substantially constant supply rate. The above supply rate regarding the supply of the woody biomass Wb means the supply amount per unit time.

[0025] In the present disclosure, the terms "upstream" and "downstream" are used based on the flow in the manufacturing system 1 of the woody biomass Wb, the intermediate products derived from the woody biomass Wb, and the biomass fuel. That is, in the manufacturing system 1, the woody biomass Wb, the intermediate products of the biomass fuel, and the biomass fuel are conveyed or circulated from upstream to downstream.

[0026] The rotary kiln 34 is a cylindrical heating furnace that heats the woody biomass Wb. The rotary kiln 34 is formed to extend in one direction and is installed so as to be rotatable about an axis along its extending direction. The extending direction of the rotary kiln 34 is slightly inclined with respect to the horizontal direction such that the height position decreases downstream. As the rotary kiln 34 rotates about the above axis, the woody biomass Wb inside the rotary kiln 34 moves from upstream to downstream while being heated.

[0027] The space inside the rotary kiln 34 may be maintained in a low oxygen atmosphere (non-oxidizing atmosphere) by supplying an inert gas. An inert gas may be supplied to the internal space of the rotary kiln 34 so that the oxygen concentration is maintained at 5% or less.

[0028] The heating unit 36 is disposed outside the rotary kiln 34 and applies heat to the outer wall (outer surface) of the rotary kiln 34. That is, the rotary kiln 34 is an externally heated kiln that heats the woody biomass Wb using heat from the outside. The heating unit 36 may heat the outer wall of the rotary kiln 34 using any heating means. For example, high-temperature gas is circulated along the outer wall of the rotary kiln 34. The heating region by the heating unit 36 may be located at the central portion in the extending direction of the rotary kiln 34.

[0029] The rotary kiln 34 (externally heated kiln) heats the woody biomass Wb to 400°C to 700°C in a low oxygen atmosphere, for example. By heating in the externally heated kiln, the woody biomass Wb is decomposed into a decomposition gas Gd (pyrolysis gas) and a carbide in the internal space of the rotary kiln 34. The carbide obtained by decomposing the woody biomass Wb can be said to be a residue. In the production system 1, the remaining carbide (char) after the decomposition gas Gd is generated is recovered as solid fuel. As described above, the rotary kiln 34 heats the woody biomass Wb and decomposes it into the decomposition gas Gd and solid fuel.

[0030] The discharge section 38 is connected to the downstream end of the rotary kiln 34 and forms a discharge space connected to the internal space of the rotary kiln 34. The discharge section 38 receives the solid fuel discharged from the downstream end of the rotary kiln 34 and sends the solid fuel from the discharge port toward the device located downstream. The decomposition gas Gd is sent from the internal space of the rotary kiln 34 or the discharge space formed by the discharge section 38 to the recovery device 40 via a extraction pipe. The decomposition gas Gd is a mixed gas of a gaseous organic component (bio-oil) and water vapor.

[0031] The recovery device 40 is a device that cools the decomposition gas Gd generated by the heating device 30 and recovers liquid fuel (oil) from the decomposition gas Gd. The recovery device 40 recovers the liquid fuel, for example, by bringing a cooling liquid into contact with the decomposition gas Gd inside a container. The cooling liquid brought into contact with the decomposition gas Gd may contain a part of the liquid fuel already generated by cooling. The cooled fluid G0 containing the decomposition gas Gd after the liquid fuel is recovered in the recovery device 40 is sent (discharged) to the combustion furnace 190. Details of the recovery device 40 and the cooled fluid G0 will be described later.

[0032] The combustion furnace 190 burns the cooled fluid G0 discharged from the recovery device 40 to generate combustion gas G1 for heating the rotary kiln 34. The combustion furnace 190 may be provided with an auxiliary burner for burning the cooled fluid G0. The combustion furnace 190 sends the generated combustion gas G1 to the heating section 36. The heating section 36 may heat the outer wall of the rotary kiln 34 by using the combustion gas G1 (for example, by circulating the combustion gas G1 around the rotary kiln 34).

[0033] In the heating unit 36, the combustion gas G1 after being used for heating the rotary kiln 34 may be sent to the drying device 20. Different from the example shown in FIG. 1, the combustion gas G1 generated in the combustion furnace 190 may be sent to each of the heating unit 36 and the drying device 20. In this case, the drying device 20 may be supplied with the combustion gas G1 without passing through the heating unit 36, instead of or in addition to the combustion gas G1 sent through the heating unit 36. The drying device 20 may use at least one of the combustion gas G1 supplied through the heating unit 36 and the combustion gas G1 supplied without passing through the heating unit 36 as the gas derived from the combustion gas G1 to dry the woody biomass Wb. The combustion gas G1 after being used for drying the woody biomass Wb may be discharged to the outside of the system (for example, released to the atmosphere) through the cyclone 22 and the bag filter 24.

[0034] (Recovery device) FIG. 2 schematically shows an example of the recovery device 40. The recovery device 40 has one or more recovery tanks. The one or more recovery tanks form a space through which the decomposition gas Gd flows. The space formed by the one or more recovery tanks can also be said to be a space for cooling the decomposition gas Gd. The recovery device 40 has, for example, a first recovery tank 50 and a second recovery tank 60 as the one or more recovery tanks. The first recovery tank 50 is the recovery tank into which the decomposition gas Gd from the heating device 30 is first introduced among the one or more recovery tanks. That is, the decomposition gas Gd from the heating device 30 is introduced into the first recovery tank 50 without passing through other recovery tanks. The recovery device 40 may have a connection pipe 58 connecting the first recovery tank 50 and the second recovery tank 60.

[0035] The first recovery tank 50 has a container body 52 forming an internal space, a gas inlet 53, an inner cylinder tube 52b, a gas outlet 54, and a liquid outlet 56. The container body 52 forms, for example, a columnar internal space extending in the vertical direction. In FIG. 2, the upward direction in the vertical direction is indicated by "Z1", and the downward direction in the vertical direction is indicated by "Z2". The lower end portion and the vicinity thereof of the internal space formed by the container body 52 may be conical such that the area becomes smaller toward the lower end.

[0036] The gas inlet 53 (first inlet) is an opening for introducing the decomposition gas Gd into the internal space formed by the container body 52. The gas inlet 53 is provided, for example, at the upper end of the first recovery tank 50. The gas inlet 53 may be provided in the upper wall portion of the container body 52. One end on the downstream side of the pipe for guiding the decomposition gas Gd from the heating device 30 to the first recovery tank 50 may be connected to the gas inlet 53.

[0037] The inner cylinder tube 52b is formed to extend downward from the gas inlet 53 and is a part for guiding the decomposition gas Gd to the inside of the first recovery tank 50. The inner cylinder tube 52b is disposed in the internal space formed by the container body 52. Fig. 3(a) illustrates a view of the gas inlet 53 as seen from above, and Fig. 3(b) illustrates a cross-sectional view when the central portion in the vertical direction of the first recovery tank 50 is cut horizontally.

[0038] As shown in Fig. 3(a), in a plan view (viewed from above), the gas inlet 53 may be disposed substantially at the center of the space formed by the container body 52. As shown in Fig. 3(b), in a cross-section orthogonal to the vertical direction of the first recovery tank 50, the inner cylinder tube 52b may also be disposed substantially at the center of the space formed by the container body 52.

[0039] The space formed by the container body 52 is partitioned into two spaces by the inner cylinder tube 52b (see also Fig. 2). In Figs. 2, 3(a), and 3(b), the space formed inside the inner cylinder tube 52b is denoted by "S0", and the space outside the inner cylinder tube 52b is denoted by "S1". The lower end of the inner cylinder tube 52b is open, and the lower end of the inner cylinder tube 52b corresponds to the boundary between the space S0 and the space S1. In the internal space of the first recovery tank 50, in the region where the inner cylinder tube 52b exists, the space S1 surrounds the periphery of the space S0.

[0040] The recovery device 40 has a gas cooling unit 48. The gas cooling unit 48 causes a cooling liquid to contact the decomposition gas Gd inside the first recovery tank 50 among the above-mentioned one or more recovery tanks. The gas cooling unit 48 cools the decomposition gas Gd by causing the cooling liquid to contact the decomposition gas Gd flowing inside the first recovery tank 50. From the cooling of the decomposition gas Gd, a liquid fuel is generated from the decomposition gas Gd.

[0041] The gas cooling unit 48 has, for example, a plurality of spray nozzles arranged so as to surround the inner cylinder tube 52b. The plurality of spray nozzles are members that spray a cooling liquid in a portion surrounding the space S0 in the space S1. The cooling liquid sprayed by the plurality of spray nozzles of the gas cooling unit 48 may contain a part of the liquid fuel already obtained by the recovery device 40. The gas cooling unit 48 may supply water in addition to the liquid fuel so as to contact the decomposition gas Gd as the cooling liquid.

[0042] The liquid fuel generated by the contact between the cooling liquid and the decomposition gas Gd accumulates downward inside the first recovery tank 50. Not all of the decomposition gas Gd is liquefied by the contact with the cooling liquid, and the unliquefied decomposition gas Gd flows toward the gas discharge port 54 as residual gas. The decomposition gas Gd as residual gas flows together with the liquid particles enlarged (grown by enlargement) by the contact with the cooling liquid. These liquid particles are liquid components that did not fall as water droplets and include, for example, water vapor, mist, and fine particles of each of water and organic components (oil). In the present disclosure, a fluid containing the decomposition gas Gd as residual gas and liquid particles is referred to as "cooled fluid G0". The cooled fluid G0 is a fluid (the remaining fluid that did not fall as liquid fuel) containing the decomposition gas Gd (residual gas) cooled by the cooling liquid. The cooled fluid G0 flows inside the first recovery tank 50 and the like in the same manner as the decomposition gas Gd before cooling.

[0043] Returning to the description of the first recovery tank 50, the gas discharge port 54 is an opening for discharging the cooled fluid G0 containing the decomposition gas Gd, which is the residual gas, and liquid particles to the outside of the first recovery tank 50. The gas discharge port 54 is formed, for example, in the side wall of the container body 52. In the vertical direction, the gas discharge port 54 is located above the lower end of the inner cylinder tube 52b. The decomposition gas Gd introduced from the gas inlet 53 located at the upper end of the container body 52 descends through the space S0 inside the inner cylinder tube 52b and is introduced into the space S1. Then, the decomposition gas Gd introduced into the space S1 is discharged from the gas discharge port 54 through the portion surrounding the space S0 in the space S1. One end of the upstream side of the connection pipe 58 may be connected to the gas discharge port 54.

[0044] The liquid discharge port 56 is a discharge port for discharging the liquid fuel accumulated in the lower part of the internal space of the first recovery tank 50 to the outside of the first recovery tank 50. The liquid discharge port 56 is provided, for example, at the bottom of the container body 52. Note that the recovery device 40 may have a stirring device for stirring the liquid fuel accumulated in the lower part of the internal space of the first recovery tank 50.

[0045] The second recovery tank 60 is connected to the first recovery tank 50 via the connection pipe 58. The second recovery tank 60 is a recovery tank adjacent to the first recovery tank 50. The recovery tank adjacent to the first recovery tank 50 means that there is no other recovery tank between the first recovery tank 50 and it. Even if members other than the recovery tank such as the connection pipe 58 are arranged between the first recovery tank 50 and the second recovery tank 60, the second recovery tank 60 is a recovery tank adjacent to the first recovery tank 50.

[0046] The second recovery tank 60 has, for example, a container body 62 forming an internal space, a gas inlet 63, a gas discharge port 64, and a liquid discharge port 66. The container body 62 forms, for example, a columnar space S2 extending in the vertical direction. The lower end portion and the vicinity thereof of the space S2 formed by the container body 62 may be conical such that the area becomes smaller toward the lower end.

[0047] The gas inlet 63 (second inlet) is an opening for introducing the cooled fluid G0 into the space S2 formed by the container body 62. The gas inlet 63 may be provided on the side wall of the container body 62. In the vertical direction, at least a part of the height position of the gas inlet 63 may be the same as at least a part of the height position of the gas outlet 54. One end on the downstream side of the connection pipe 58 may be connected to the gas inlet 63. The internal spaces (space S0 and space S1) of the first recovery tank 50 and the internal space (space S2) of the second recovery tank 60 may be connected via the flow path in the connection pipe 58.

[0048] The gas outlet 64 (second outlet) is an opening for discharging the cooled fluid G0 containing the decomposed gas Gd to the outside of the second recovery tank 60. When the recovery device 40 has two recovery tanks, one end on the upstream side of the pipe for guiding the cooled fluid G0 from the recovery device 40 to the combustion furnace 190 may be connected to the gas outlet 64 of the second recovery tank 60. The gas outlet 64 is provided, for example, at the upper end portion (upper wall portion of the container body 62) of the second recovery tank 60.

[0049] As will be described later, liquid fuel is stored in the lower part of the internal space of the second recovery tank 60. The liquid outlet 66 is an outlet for discharging the liquid fuel stored in the lower part of the internal space of the second recovery tank 60 to the outside of the second recovery tank 60. The liquid outlet 66 is provided, for example, at the bottom of the container body 52.

[0050] The recovery device 40 has a shielding member 70. The shielding member 70 is a member installed on the flow path through which the cooled fluid G0 flows inside any one of the above one or more recovery tanks so that the cooled fluid G0 hits it. When the cooled fluid G0 hits inside the tank, it does not mean hitting the inner wall of the container body that forms the internal space of the tank, but means hitting the member at a position away from the inner wall inside the space defined by the inner wall of the container body. That is, the shielding member 70 is a member different from the inner wall of the container body that forms the internal space of the tank.

[0051] The shielding member 70 is installed, for example, inside the second recovery tank 60 so as to face the cooled fluid G0 on the flow path through which the cooled fluid G0 introduced from the first recovery tank 50 to the second recovery tank 60 flows. The shielding member 70 may be a member formed in a plate shape. A part of the shielding member 70 may be fixed to the inner wall of the container body 62 of the second recovery tank 60. In one example, the shielding member 70 includes a facing surface 70a and a guiding surface 70b. The shielding member 70 may include a plate-shaped first portion forming the facing surface 70a and a plate-shaped second portion forming the guiding surface 70b.

[0052] The facing surface 70a is a surface facing the gas inlet 63. As shown in FIG. 3(c), when viewed from a direction orthogonal to the gas inlet 63, the facing surface 70a covers the entire area of the gas inlet 63. That is, when viewed from a direction orthogonal to the plane including the opening edge of the gas inlet 63, the facing surface 70a covers the entire area of the region with the opening edge of the gas inlet 63 as the outer edge. The lateral width of the facing surface 70a may be larger than that of the gas inlet 63, and preferably, both ends of the facing surface 70a in the horizontal direction may extend to and be connected to the inner wall of the container body 62. The facing surface 70a may be planar or curved. The planar facing surface 70a may be in a state of standing upright in the vertical direction or may be inclined with respect to the vertical direction.

[0053] The shortest distance in the horizontal direction between the facing surface 70a and the gas inlet 63 may be equal to or less than half of the maximum width of the second recovery tank 60 in the horizontal direction. The shortest distance in the horizontal direction between the facing surface 70a and the gas inlet 63 may be 1 / 5 to 1 / 2 times the maximum width. The flow velocity of the cooled fluid G0 flowing in the connection pipe 58 may be such that most of the cooled fluid G0 immediately after being introduced into the second recovery tank 60 hits the facing surface 70a.

[0054] The shielding member 70 is arranged so that the facing surface 70a prevents the transfer flow of the cooled fluid G0 in the recovery tank. Preventing the transfer flow of the cooled fluid G0 means preventing the flow of the cooled fluid G0 and changing the flow thereof when it is assumed that the shielding member 70 (facing surface 70a) is not present.

[0055] When at least a part of the cooled fluid G0 hits the shielding member 70, liquid particles of water and organic components contained in the cooled fluid G0 are trapped by the shielding member 70 and fall after passing over the opposing surface 70a. Further, in the cooled fluid G0, a part of the gas components that did not become liquid particles condenses by the shielding member 70 and grows into liquid particles or droplets, and thus falls together. As a result, as shown in FIG. 2, liquid fuel derived from the decomposition gas Gd accumulates in the lower part of the space S2 in the second recovery tank 60.

[0056] The cooled fluid G0 introduced into the space S2 in the second recovery tank 60 is a fluid containing the decomposition gas Gd and liquid particles after the liquid fuel has been recovered in the first recovery tank 50. Therefore, the water content of the liquid fuel obtained in the space S2 can be higher than that of the liquid fuel obtained in the space S1. The remaining cooled fluid G0 that did not liquefy in the shielding member 70 flows downward along the opposing surface 70a, for example, and then rises and flows to the gas discharge port 64. The amount of liquid particles contained in the cooled fluid G0 before hitting the shielding member 70 is larger than the amount of liquid particles contained in the cooled fluid G0 after passing through the shielding member 70.

[0057] The guide surface 70b is a surface connecting one end of the opposing surface 70a near the gas discharge port 64 and the container body 62. The guide surface 70b is arranged so as to block the flow path directly leading to the gas discharge port 64 without hitting the opposing surface 70a. The guide surface 70b connects, for example, the upper end of the opposing surface 70a and a location above the gas inlet 63 on the side wall of the container body 62. The guide surface 70b may be planar or curved. The planar guide surface 70b may be inclined with respect to both the vertical direction and the horizontal direction.

[0058] The recovery device 40 has an extraction pipe 72 (first extraction pipe) and an extraction pipe 73 (second extraction pipe). The extraction pipe 72 is a pipe for extracting the liquid fuel generated inside the first recovery tank 50. One end of the extraction pipe 72 is connected to the liquid discharge port 56 of the first recovery tank 50. The extraction pipe 73 is a pipe for extracting the liquid fuel generated inside the second recovery tank 60. One end of the extraction pipe 73 is connected to the liquid discharge port 66 of the second recovery tank 60. The other end of the extraction pipe 72 and the other end of the extraction pipe 73 are connected to each other (merged).

[0059] The recovery device 40 has a circulation device 80. The circulation device 80 is a device that cools the liquid fuel extracted from the above one or more recovery tanks and introduces the cooled liquid fuel into the gas cooling unit 48. The circulation device 80 has, for example, a circulation pipe 81, a pump 82, and a heat exchanger 84. The circulation pipe 81 is a pipe that guides the liquid fuel from the connection point (merging point) of the extraction pipe 72 and the extraction pipe 73 to the gas cooling unit 48.

[0060] The pump 82 is arranged on the flow path of the circulation pipe 81 and pumps the liquid fuel extracted by the extraction pipe 72 and the extraction pipe 73 to the gas cooling unit 48. The heat exchanger 84 cools the liquid fuel by heat exchange with a refrigerant. The refrigerant used by the heat exchanger 84 is, for example, normal temperature water or normal temperature air. A pipe 87 that guides the liquid fuel from the middle of the flow path of the circulation pipe 81 to the recovery container 88 branches off. A part of the liquid fuel pumped by the pump 82 is returned to the gas cooling unit 48, and another part of the liquid fuel pumped by the pump 82 is introduced into the recovery container 88. The liquid fuel returned to the gas cooling unit 48 is used as a cooling liquid for cooling the decomposition gas Gd. The liquid fuel introduced into the recovery container 88 is taken out, for example, as a product of biomass fuel.

[0061] The recovery device 40 has an opening / closing member 74. The opening / closing member 74 is a member capable of changing the opening degree of the flow path in the extraction pipe 73. The opening / closing member 74 may be a valve that switches between a closed state in which liquid fuel does not flow in the extraction pipe 73 and an open state in which liquid fuel flows in the extraction pipe 73. Changing the opening degree of the flow path also includes changing the opening degree between 100% (open state) and 0% (closed state). The opening / closing member 74 may be a valve capable of adjusting the opening degree of the flow path in the extraction pipe 73. In one example, the opening degree of the flow path in the extraction pipe 73 is adjusted to an arbitrary opening degree within the range of 0% to 100% by the opening / closing member 74.

[0062] The recovery device 40 has a water supply unit 76. The water supply unit 76 supplies water to the inside of the first recovery tank 50 so as to be mixed with the liquid fuel stored in the lower part inside the first recovery tank 50. The water supply unit 76 may supply water to the inside of the first recovery tank 50 so as to stir the liquid fuel stored in the first recovery tank 50. In this case, a device for stirring the liquid fuel in the first recovery tank 50 may not be provided separately from the water supply unit 76. The water supply unit 76 may supply industrial water to the inside of the first recovery tank 50.

[0063] The water supply unit 76 includes, for example, a supply source 77, a supply pipe 78, and an opening / closing member 79. The supply source 77 is a water supply source and is connected to the inside of the first recovery tank 50 via the supply pipe 78. The opening / closing member 79 is, for example, a valve that switches between a state in which water is supplied to the inside of the first recovery tank 50 and a state in which water is not supplied to the inside of the first recovery tank 50 by switching the open / closed state of the flow path in the supply pipe 78. Alternatively, the opening / closing member 79 may be a valve capable of adjusting the opening degree of the flow path.

[0064] The recovery device 40 has a moisture measuring device 86. The moisture measuring device 86 measures information representing a physical quantity corresponding to the moisture contained in the liquid fuel (hereinafter referred to as "moisture information") on the flow path in the circulation pipe 81, for example. The moisture measuring device 86 may measure the amount of moisture itself (for example, the moisture content) contained in the liquid fuel as the moisture information. The moisture measuring device 86 may measure the specific gravity of the liquid fuel instead of or in addition to the amount of moisture contained in the liquid fuel as the moisture information. The moisture measuring device 86 may measure the viscosity of the liquid fuel instead of or in addition to the amount of moisture contained in the liquid fuel as the moisture information. The moisture measuring device 86 may be installed upstream of the heat exchanger 84 or downstream (on the flow path between the heat exchanger 84 and the gas cooling unit 48) on the flow path in the circulation pipe 81. From the viewpoint of accurately measuring the moisture content, specific gravity, and / or viscosity, the moisture measuring device 86 may be installed upstream of the heat exchanger 84 (on the flow path before passing through the heat exchanger 84).

[0065] The recovery device 40 has a control device 110. The moisture information measured by the moisture measuring device 86 is input to the control device 110. The control device 110 is at least a device (computer) that controls the opening / closing member 74. The control device 110 controls the opening / closing member 74 provided on the flow path in the extraction pipe 73 based on the moisture information obtained by the measurement of the moisture measuring device 86. In one example, the control device 110 controls the opening / closing member 74 so as to change the opening degree of the flow path in the extraction pipe 73 based on the measurement result of the amount of moisture contained in the liquid fuel on the flow path in the circulation pipe 81.

[0066] The control device 110 may control the opening / closing member 74 so that the measurement result of the amount of moisture contained in the liquid fuel on the flow path in the circulation pipe 81 approaches a predetermined target value. The control device 110 may adjust the ratio of the time during which the flow path is maintained in the open state by the opening / closing member 74 to the time during which the flow path is maintained in the closed state by the opening / closing member 74 so that the measurement result of the amount of moisture contained in the liquid fuel on the flow path in the circulation pipe 81 approaches a predetermined target value. The control device 110 may adjust the opening degree of the opening / closing member 74 so that the measurement result of the amount of moisture contained in the liquid fuel on the flow path in the circulation pipe 81 approaches a predetermined target value.

[0067] The control device 110 may control the opening and closing member 79 in the water supply unit 76 based on the moisture information obtained by the measurement of the moisture meter 86. For example, when the moisture content obtained by the measurement of the moisture meter 86 is lower than an arbitrary set moisture content, the control device 110 may switch the opening and closing member 79 to the open state for a preset time or a time corresponding to the measurement result of the moisture content, and inject water from the water supply unit 76 into the interior of the first recovery tank 50.

[0068] The recovery device 40 has a refrigerant supply unit 90. The refrigerant supply unit 90 supplies refrigerant to the heat exchanger 84. The refrigerant supply unit 90 includes, for example, a supply pipe 92, a pump 93, and an opening and closing member 94. The supply pipe 92 is a pipe that guides the refrigerant to the heat exchanger 84. The pump 93 pumps the refrigerant. The pump 93 can adjust the supply rate of the refrigerant. The opening and closing member 94 is, for example, a valve capable of adjusting the opening degree of the flow path. The refrigerant supply unit 90 may supply the refrigerant to the heat exchanger 84 while circulating the refrigerant.

[0069] The recovery device 40 has a temperature measuring device 91 and a control device 120. The temperature measuring device 91 is installed in a section of the flow path in the circulation pipe 81 downstream of the heat exchanger 84 and measures the temperature of the liquid fuel. The control device 120 receives the temperature measurement result from the temperature measuring device 91 and controls the opening and closing member 94 based on the measurement result. For example, the control device 120 controls the opening and closing member 94 so that the temperature measurement result by the temperature measuring device 91 approaches a predetermined target value.

[0070] The recovery device 40 includes one or more water level gauges 49, an opening / closing member 89, and a control device 130. The one or more water level gauges 49 are installed in the first recovery tank 50. The water level gauge 49 is, for example, a sensor that outputs a signal when the liquid fuel in the first recovery tank 50 falls below the location (level) where the gauge itself is installed. Alternatively, the water level gauge 49 may acquire information (measured value of the water level) representing the water level of the liquid fuel in the first recovery tank 50. The opening / closing member 89 is provided on the flow path in a pipe 87 that branches from the circulation pipe 81 and guides the liquid fuel to the recovery container 88. The opening / closing member 89 is, for example, a valve that switches the opening / closing state of the flow path in the pipe 87.

[0071] The control device 130 receives a signal from the one or more water level gauges 49 and controls the opening / closing member 89. For example, when the liquid fuel in the first recovery tank 50 exceeds an arbitrary set water level, the control device 130 switches the opening / closing member 89 to the open state. For example, when the liquid fuel in the first recovery tank 50 is below an arbitrary set water level, the control device 130 switches the opening / closing member 89 to the closed state.

[0072] Each of the control device 110, the control device 120, and the control device 130 includes, for example, as a hardware configuration, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an input / output interface, etc. At least a part of the control device 110, the control device 120, and the control device 130 may be configured by one computer.

[0073] [Method for manufacturing biomass fuel] Next, a method for manufacturing biomass fuel executed in the above manufacturing system 1 will be described. The method for manufacturing biomass fuel includes at least a pulverizing step, a drying step, a heating step, a first recovery step, a second recovery step, and a combustion step. These steps are executed in parallel during at least a partially overlapping period. The pulverizing step is a step of obtaining woody biomass Wb by pulverizing wood chips or waste wood with the pulverizing device 10. The drying step is a step of drying the woody biomass Wb before heating by the heating step with the drying device 20.

[0074] The heating step is a step of heating the woody biomass Wb with the heating device 30 to decompose it into decomposition gas Gd and solid fuel. In the heating step, for example, the woody biomass Wb is heated using a rotary kiln 34 which is an externally heated kiln. The extraction step is a step of sending the decomposition gas Gd to the recovery device 40 through an extraction pipe from the internal space of the rotary kiln 34 or the discharge space formed by the discharge section 38. The first recovery step is a step of taking out and recovering the solid fuel generated in the heating step from the heating device 30.

[0075] The second recovery step is a step of cooling the decomposition gas Gd generated in the heating step with the recovery device 40 to recover liquid fuel from the decomposition gas Gd. By executing the second recovery step, a cooled fluid G0 containing the decomposition gas Gd that has not been recovered as liquid fuel is obtained. Details of the second recovery step will be described later.

[0076] The combustion process is a process of burning the post-cooling fluid G0 by the combustion furnace 190 to generate combustion gas G1 for heating the rotary kiln 34. The combustion gas G1 generated in the combustion furnace 190 in the combustion process is introduced into the heating section 36 of the heating device 30. In the above heating process, the heating section 36 may heat the rotary kiln 34 using the combustion gas G1. In the above drying process, at least one of the combustion gas G1 after being used for heating the rotary kiln 34 in the heating process and the combustion gas G1 generated by the combustion furnace 190 and supplied without passing through the rotary kiln 34 may be used to dry the woody biomass Wb.

[0077] The above second recovery process includes a gas introduction process, a gas cooling process, a shielding process, a gas discharge process, an extraction process, a circulation process, and a control process. These processes are executed in parallel during at least partially overlapping periods.

[0078] The gas introduction process is a process of introducing the decomposition gas Gd from the heating device 30 into the interior of the first recovery tank 50 among one or more recovery tanks included in the recovery device 40. When the recovery device 40 includes the first recovery tank 50 and the second recovery tank 60, in the gas introduction process, the decomposition gas Gd from the heating device 30 is first introduced into the first recovery tank 50 instead of the second recovery tank 60.

[0079] The gas cooling process is a process of bringing a cooling liquid into contact with the decomposition gas Gd inside the first recovery tank 50. By bringing the cooling liquid into contact with the decomposition gas Gd, a liquid fuel and the above post-cooling fluid G0 are obtained. The cooling liquid used in the gas cooling process may contain at least one of the already generated liquid fuel and water. The liquid fuel generated along with the contact of the cooling liquid with the decomposition gas Gd may be stored in the lower part inside the first recovery tank 50. The post-cooling fluid G0 may also be introduced into the interior of the second recovery tank 60 adjacent to the first recovery tank 50 via the connection pipe 58.

[0080] The shielding process is a process of applying the cooled fluid G0 to the shielding member 70 on the flow path through which the cooled fluid G0 flows inside any one of the one or more recovery tanks included in the recovery device 40. In the shielding process, for example, inside the second recovery tank 60, the cooled fluid G0 is applied to the shielding member 70. By applying the cooled fluid G0 to the shielding member 70, liquid fuel can be obtained from the cooled fluid G0. The liquid fuel generated along with the contact of the cooled fluid G0 with the shielding member 70 may be stored in the lower part inside the second recovery tank 60.

[0081] The gas discharge process is a process of discharging the cooled fluid G0 after passing through the shielding member 70 from inside the one or more recovery tanks included in the recovery device 40 to the outside of the recovery device 40. In the gas discharge process, for example, the cooled fluid G0 is discharged from inside the second recovery tank 60 to the outside of the recovery device 40. The cooled fluid G0 discharged to the outside of the recovery device 40 may be introduced into the combustion furnace 190.

[0082] The extraction process is a process of extracting liquid fuel from each of the one or more recovery tanks included in the recovery device 40. In the extraction process, for example, liquid fuel is extracted from the bottom of the first recovery tank 50 by the extraction pipe 72, and liquid fuel is extracted from the bottom of the second recovery tank 60 by the extraction pipe 73. The liquid fuel extracted by the extraction pipe 72 and the liquid fuel extracted by the extraction pipe 73 merge and are introduced into the circulation device 80.

[0083] The circulation process is a process of circulating a part of the liquid fuel introduced by the extraction pipe 72 and the extraction pipe 73 to the gas cooling part 48. The circulation process may include a process of cooling the liquid fuel by the heat exchanger 84 and a process of returning the cooled liquid fuel to the gas cooling part 48. Note that the device for cooling the liquid fuel is not limited to the heat exchanger 84, and the liquid fuel may be cooled by any device. The liquid fuel not returned to the gas cooling part 48 is introduced into the recovery container 88 as a product, for example.

[0084] The control step is a step of adjusting the amount (flow rate per unit time) by which the liquid fuel withdrawn by the extraction pipe 73 is merged with the liquid fuel withdrawn by the extraction pipe 72. In the control step, for example, the opening / closing member 74 provided on the flow path of the extraction pipe 73 is controlled so that the moisture content in the liquid fuel introduced into the circulation device 80 follows the target value. Thereby, the water content (contained moisture content) of the liquid fuel introduced into the recovery container 88 can be kept within a certain target range.

[0085] [Modification Example] The number of one or more recovery tanks included in the recovery device 40 is not limited to two. The recovery device 40 may have, for example, as shown in FIG. 4(a), the first recovery tank 50 and may not have other recovery tanks. In the first recovery tank 50 illustrated in FIG. 4(a), unlike the first recovery tank 50 illustrated in FIG. 2, a gas discharge port 54 is provided at the upper end of the container body 52. Hereinafter, in order to distinguish from the first recovery tank 50 illustrated in FIG. 2, the first recovery tank 50 illustrated in FIG. 4(a) is denoted as "first recovery tank 50A".

[0086] In the first recovery tank 50A, the fluid (decomposition gas Gd or cooled fluid G0) containing the decomposition gas Gd from the heating device 30 flows in the order of the space S0, the space S1, and the gas discharge port 54. Also in the first recovery tank 50A, a cooling liquid contacts the decomposition gas Gd by the gas cooling unit 48, and while obtaining the liquid fuel, the cooled fluid G0 is generated. The cooled fluid G0 generated in the space S1 flows toward the gas discharge port 54.

[0087] The recovery device 40 may have a shielding member 70A instead of the shielding member 70. The shielding member 70A is arranged inside the first recovery tank 50A so as to hit the cooled fluid G0 on the flow path through which the cooled fluid G0 flows after cooling. The shielding member 70A may be arranged vertically below the gas discharge port 54. In one example, as shown in FIG. 4(b), in a plan view, the entire area of the gas discharge port 54 overlaps the shielding member 70A. That is, in a plan view, the opening edge of the gas discharge port 54 is surrounded by the outer edge of the shielding member 70A. In a plan view, it is sufficient that the entire area of the gas discharge port 54 overlaps the shielding member 70A. Preferably, the shielding member 70A may be formed to extend in a direction perpendicular to the direction in which the gas inlet 53 and the gas discharge port 54 are arranged side by side.

[0088] In the first recovery tank 50A, a liquid fuel is obtained by the contact of the cooling liquid with the decomposition gas Gd in the space S1, and the liquid fuel is stored in the lower part inside the first recovery tank 50. At least a part of the cooled fluid G0 generated by the contact of the cooling liquid flows toward the gas discharge port 54 in the space S1 and hits the shielding member 70A on the way, whereby more liquid fuel is obtained. The liquid fuel obtained by the collision with the shielding member 70A, for example, travels along the inner walls of the shielding member 70A and the container body 52 and flows to the lower part inside the first recovery tank 50.

[0089] In addition to the first recovery tank 50 and the second recovery tank 60, the recovery device 40 may have at least one other recovery tank. The cooled fluid G0 discharged from the second recovery tank 60 may be introduced into another recovery tank. Instead of or in addition to the shielding member 70, a shielding member having the same function as the shielding member 70 may be arranged in another recovery tank. In addition to the first recovery tank 50, the recovery device 40 may have another gas cooling unit that brings the cooling liquid into contact with the decomposition gas Gd (the cooled fluid G0 containing the decomposition gas Gd) in another recovery tank.

[0090] Instead of the control device 110, an operator such as an operator may operate the opening / closing member 74 to adjust the opening degree in the flow path on the extraction pipe 73. Instead of the control by the control device 110, the opening / closing member 79 may be operated by the operator. Instead of the control by the control device 120, the opening / closing member 94 may be operated by the operator. Instead of the control by the control device 130, the opening / closing member 89 may be operated by the operator. Signals from at least some of the various measuring instruments provided in the recovery device 40 may be output to a monitor that can be confirmed by the operator.

[0091] The drying device 20 may dry the woody biomass Wb using a gas for drying other than the combustion gas G1 in addition to the combustion gas G1. The drying device 20 may dry the woody biomass Wb using a gas for drying other than the combustion gas G1 instead of the combustion gas G1. The manufacturing system 1 may not include the drying device 20. The woody biomass Wb obtained by pulverization in the pulverizing device 10 may be introduced into the heating device 30 without passing through a device for drying. The heating device 30 may have an internal combustion kiln instead of an external heating kiln. In one of the various examples described above, at least some of the matters described in other examples may be combined.

[0092] [Summary of the present disclosure] The manufacturing system (1) described above includes a heating device (30) that heats the woody biomass (Wb) and decomposes it into a decomposition gas (Gd) and solid fuel, and a recovery device (40) that cools the decomposition gas (Gd) generated by the heating device (30) and recovers liquid fuel from the decomposition gas (Gd). The recovery device (40) includes one or more recovery tanks (50, 60, 50A) that form a space (S0, S1, S2) through which the decomposition gas (Gd) flows, and a gas cooling section (48) that contacts a cooling liquid with the decomposition gas (Gd) inside the first recovery tank (50, 50A) into which the decomposition gas (Gd) from the heating device (30) is first introduced among the one or more recovery tanks (50, 60, 50A), and a shielding member (70, 70A) installed on a flow path through which a cooled fluid (G0) containing the decomposition gas (Gd) after being cooled by the cooling liquid flows inside any one of the one or more recovery tanks (50, 60, 50A) so that the cooled fluid (G0) hits it.

[0093] In this manufacturing system (1), a shielding member (70, 70A) is installed inside any one of the one or more recovery tanks (50, 60, 50A) so that the cooled fluid (G0) hits it. After the liquid fuel is obtained by contact with the cooling liquid, the cooled fluid (G0) still contains organic components that can be used as liquid fuel. When the cooled fluid (G0) hits the shielding member (70, 70A), at least a part of the organic components remaining in the cooled fluid (G0) is further recovered as liquid fuel. As a result, the yield (recovery rate) of the liquid fuel is improved compared to the case where the shielding member (70, 70A) is not provided. Therefore, the manufacturing system (1) is useful for improving the recovery rate.

[0094] The above-mentioned recovery tank(s) with a quantity of 1 or more may include a first recovery tank (50) and a second recovery tank (60) adjacent to the first recovery tank (50). The shielding member (70) may be installed inside the second recovery tank (60) such that the cooled fluid (G0) introduced from the first recovery tank (50) hits the cooled fluid (G0) on the flow path through which the cooled fluid (G0) flows. In this case, the liquid fuel generated by the contact of the cooling liquid and the liquid fuel generated by hitting the shielding member (70) can be stored in separate tanks.

[0095] The second recovery tank (60) may include a second inlet (63) for introducing the cooled fluid (G0) from the first recovery tank (50). The shielding member (70) may include an opposing surface (70a) facing the second inlet (63). When viewed from a direction orthogonal to the second inlet (63), the opposing surface (70a) may cover the entire area of the second inlet (63). In this case, more of the cooled fluid (G0) can be applied to the shielding member (70), and the amount of liquid fuel that can be recovered in the second recovery tank (60) can be increased. Therefore, the yield (recovery rate) of the liquid fuel can be further improved.

[0096] The second recovery tank (60) may further include a container body (62) that forms an internal space (S2) and a second outlet (64) for discharging the cooled fluid (G0) outside the second recovery tank (60). The shielding member (70) may further include a guide surface (70b) connecting one end of the opposing surface (70a) near the second outlet (64) and the container body (62). In this case, it is difficult to form a flow of the cooled fluid (G0) that does not hit the opposing surface (70a) and heads toward the gas outlet (64). Therefore, more of the cooled fluid (G0) can be applied to the shielding member (70), and the amount of liquid fuel that can be recovered in the second recovery tank (60) can be increased. Therefore, the yield (recovery rate) of the liquid fuel can be further improved.

[0097] The recovery device (40) may further include a first extraction pipe (72) for extracting the liquid fuel generated inside the first recovery tank (50), a second extraction pipe (73) for extracting the liquid fuel generated inside the second recovery tank (60), and an opening / closing member (74) capable of changing the opening degree of the flow path inside the second extraction pipe (73). Between the first recovery tank (50) and the second recovery tank (60), the moisture content contained in the liquid fuel can be made different. In the above configuration, by providing the opening / closing member (74), the amount of the liquid fuel from the second recovery tank (60) to be mixed with the liquid fuel from the first recovery tank (50) can be adjusted. Thereby, the moisture content of the liquid fuel recovered as a product can be adjusted. Therefore, variations in the quality of the liquid fuel recovered as a product can be suppressed.

[0098] The recovery device (40) further has a circulation device (80) that cools the liquid fuel extracted from one or more recovery tanks (50, 60, 50A) and introduces the cooled liquid fuel into the gas cooling section (48). In this case, the already generated liquid fuel can be used as the cooling liquid. As a result, the liquid fuel recovered as a product can be concentrated.

[0099] The first recovery tank (50) may include a first inlet (53) for introducing the decomposition gas (Gd) into the inside from the upper end of the first recovery tank (50), and an inner cylinder pipe (52b) formed to extend downward from the first inlet (53) and guiding the decomposition gas (Gd) to the inside of the first recovery tank (50). In this case, compared with the case where the inner cylinder pipe (52b) is not provided, the flow path through which the decomposition gas (Gd) flows can be lengthened inside the first recovery tank (50), and more decomposition gas (Gd) can be brought into contact with the cooling liquid. As a result, the yield (recovery rate) of the liquid fuel can be further improved.

[0100] The heating device (30) may have an externally heated kiln (34) that heats the woody biomass (Wb) using heat from the outside. The manufacturing system (1) may further include a combustion furnace (190) that burns the cooled fluid (G0) after being discharged from the recovery device (40) to generate combustion gas (G1) for heating the kiln (34). In this case, the oil components remaining in the cooled fluid (G0) can be effectively utilized even after passing through the shielding members (70, 70A). Note that the woody biomass (Wb) may be obtained from waste or the like, and the quality of the woody biomass (Wb) tends to be unstable. In the fluid (residual gas of cracked gas and liquid particles) after recovering the liquid fuel obtained from such woody biomass (Wb), the variations in the amounts of organic components and water vapor tend to be large. On the other hand, in the above configuration, since the organic components are further recovered by the shielding members (70, 70A), the variations in the components of the cooled fluid (G0) introduced into the combustion furnace (190) can be reduced. As a result, the operation of the combustion furnace (190) can be stabilized, and the amount of auxiliary fuel such as fossil fuel accompanied by the emission of CO 2 in the combustion furnace (190) can be reduced.

[0101] The manufacturing system (1) may further include a drying device (20) that dries the woody biomass (Wb) before being supplied to the heating device (30). In this case, the variations in the properties of the biomass fuel due to the variations in the quality inherent in the woody biomass (Wb) can be reduced.

[0102] When drying the woody biomass (Wb) before being supplied to the heating device (30), the drying device (20) may utilize the gas derived from the combustion gas (G1) generated in the combustion furnace (190). In this case, while stabilizing the quality of the biomass fuel, the amount of fuel used can be reduced.

[0103] The recovery device (40) described above is a device that cools the decomposition gas (Gd) generated in the heating device (30) that heats the woody biomass (Wb) and decomposes it into a decomposition gas (Gd) and solid fuel, and recovers liquid fuel from the decomposition gas (Gd). This recovery device (40) includes one or more recovery tanks (50, 60, 50A) that form a space (S0, S1, S2) through which the decomposition gas (Gd) flows, and among the one or more recovery tanks (50, 60, 50A), a gas cooling unit (48) that contacts a cooling liquid with the decomposition gas (Gd) inside the first recovery tank (50, 50A) into which the decomposition gas (Gd) from the heating device (30) is first introduced, and a shielding member (70, 70A) installed so that the cooled fluid (G0) containing the decomposition gas (Gd) after being cooled by the cooling liquid hits on the flow path through which the cooled fluid (G0) flows inside any one of the one or more recovery tanks (50, 60, 50A). This recovery device (40) is useful for improving the recovery rate of liquid fuel, similar to the above manufacturing system (1).

Explanation of Signs

[0104] 1... Biomass fuel manufacturing system, Wb... Woody biomass, 20... Drying device, 30... Heating device, 34... Rotary kiln, 36... Heating section, Gd... Decomposition gas, 40... Recovery device, 48... Gas cooling unit, 50, 50A... First recovery tank, 52b... Inner cylinder tube, 53... Gas inlet, 54... Gas outlet, 60... Second recovery tank, 63... Gas inlet, 64... Gas outlet, G0... Cooled fluid, 70, 70A... Shielding member, 72... Extraction pipe, 73... Extraction pipe, 74... Opening / closing member, 80... Circulation device, 190... Combustion furnace, G1... Combustion gas.

Claims

1. A heating device that heats woody biomass and decomposes it into decomposition gas and solid fuel, and A recovery device that cools the decomposition gas generated by the heating device and recovers liquid fuel from the decomposition gas, comprising: The recovery device is One or more recovery tanks that form a space through which the decomposition gas flows, and Among the one or more recovery tanks, a gas cooling unit that contacts a cooling liquid with the decomposition gas inside the first recovery tank into which the decomposition gas from the heating device is first introduced; A biomass fuel production system having a shielding member installed on a flow path through which a cooled fluid containing the decomposition gas cooled by the cooling liquid flows so that the cooled fluid hits the shielding member inside any one of the one or more recovery tanks.

2. The one or more recovery tanks include the first recovery tank and a second recovery tank adjacent to the first recovery tank, The shielding member is installed inside the second recovery tank so that the cooled fluid introduced from the first recovery tank to the second recovery tank hits the shielding member on a flow path through which the cooled fluid flows. The biomass fuel production system according to claim 1.

3. The second recovery tank includes a second inlet for introducing the cooled fluid from the first recovery tank, The shielding member includes an opposing surface facing the second inlet, When viewed from a direction orthogonal to the second inlet, the opposing surface covers the entire area of the second inlet. The biomass fuel production system according to claim 2.

4. The second recovery tank further includes a container body that forms an internal space and a second outlet for discharging the cooled fluid outside the second recovery tank, The shielding member further includes a guide surface that connects one end of the opposing surface closer to the second outlet and the container body. The biomass fuel production system according to claim 3.

5. The recovery device A first extraction pipe for extracting the liquid fuel generated inside the first recovery tank, A second extraction pipe for extracting the liquid fuel generated inside the second recovery tank, and An opening and closing member capable of changing the opening degree of the flow path inside the second extraction pipe. The biomass fuel production system according to any one of claims 2 to 4.

6. The recovery device further includes a circulation device that cools the liquid fuel withdrawn from the one or more recovery tanks and introduces the cooled liquid fuel into the gas cooling unit. The biomass fuel production system according to any one of claims 1 to 4.

7. The first recovery tank A first inlet for introducing decomposition gas into the interior from the upper end of the first recovery tank, An inner cylinder pipe that is formed to extend downward from the first inlet and guides the decomposition gas to the inside of the first recovery tank. The biomass fuel production system according to any one of claims 1 to 4.

8. The heating device has an externally heated kiln that heats the woody biomass using heat from the outside, The production system further includes a combustion furnace that burns the cooled fluid after being discharged from the recovery device to generate combustion gas for heating the kiln. The biomass fuel production system according to any one of claims 1 to 4.

9. The biomass fuel production system according to any one of claims 1 to 4 further includes a drying device that dries the woody biomass before being supplied to the heating device.

10. The heating device has an externally heated kiln that heats the woody biomass using heat from the outside, The production system further includes a combustion furnace that burns the cooled fluid after being discharged from the recovery device to generate combustion gas for heating the kiln, When the drying device dries the woody biomass before being supplied to the heating device, the drying device uses the gas derived from the combustion gas generated in the combustion furnace. The biomass fuel production system according to claim 9.

11. A recovery device that cools the decomposition gas generated in a heating device that heats woody biomass to decompose it into decomposition gas and solid fuel, and recovers liquid fuel from the decomposition gas, One or more recovery tanks that form a space through which the decomposition gas flows, A gas cooling unit that contacts a cooling liquid with the decomposition gas inside the first recovery tank, which is the first of the one or more recovery tanks into which the decomposition gas from the heating device is first introduced, A shielding member that is installed so as to hit the cooled fluid on a flow path through which the cooled fluid containing the decomposition gas cooled by the cooling liquid flows inside any one of the one or more recovery tanks. A liquid fuel recovery device.

Images