Biomass drying equipment

Abstract

To provide a biomass dryer capable of successively / efficiently drying a large amount of wood chips.SOLUTION: The biomass dryer comprises a feeding container 11 for wood chips A to be fed thereinto from outside, a drying container 12 drying the wood chips A, and a chip conveyor 4c conveying wood chips A fed into the feeding container 11 to the drying container 12. The drying container 12 comprises an air-cooled heat exchanger 4b blowing hot air in the direction opposite to the direction H of conveying the wood chips A conveyed by the chip conveyor 4c.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a biomass drying device for drying raw material biomass in the form of chips made from so-called wood.

Background Art

[0002] In recent years, efforts have been made on an international scale to promote the Sustainable Development Goals (the 2030 Agenda for Sustainable Development, adopted at the United Nations Summit on September 25, 2015 (Year 27 of Heisei), hereinafter referred to as "SDGs"). Specifically, the goals of the SDGs include "Goal 7: Ensure access to affordable, reliable, sustainable and modern energy for all", "Goal 9: Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation", "Goal 11: Make cities and human settlements inclusive, safe, resilient and sustainable", "Goal 12: Ensure sustainable consumption and production patterns", "Goal 13: Take urgent action to combat climate change and its impacts", "Goal 15: Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss", etc. Technological development aimed at solving these goals is desired.

[0003] As a technology that can contribute to the solution of these goals, from the perspective of the idea of carbon neutrality that does not affect the increase or decrease of carbon dioxide, in recent years, the utilization of biomass power generation using raw materials such as wood chips and chip-shaped wood has been expected. However, since the wood used as a raw material tends to have a higher moisture content compared to that produced overseas, a technology for reducing the moisture content as a pretreatment is required. And, as a technology for drying this type of wood, the configuration described in Patent Document 1 is known. Specifically, Patent Document 1 describes "a drying device for woody biomass fuel configured to dry woody biomass fuel, comprising a main body portion that defines an exhaust gas introduction space into which exhaust gas can be introduced, a front panel, a back panel facing the front panel through the exhaust gas introduction space, and an outer peripheral panel disposed between the front panel and the back panel so as to surround the periphery of the exhaust gas introduction space." A drying device for woody biomass fuel is described.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Patent No. 7089617 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, the wood biomass fuel drying apparatus described in Patent Document 1 uses exhaust gas generated by burning the fuel to dry the wood biomass fuel. In short, exhaust gas generated by burning the fuel often contains dust and moisture. For this reason, the wood biomass fuel drying apparatus described in Patent Document 1 is installed at the bottom of the wood biomass fuel storage yard where the wood biomass fuel is stored, and the heat of the exhaust gas introduced into the exhaust gas introduction space is transferred to the wood biomass fuel stored in the wood biomass fuel storage yard by non-contact heat exchange to dry it. Therefore, the wood biomass fuel drying apparatus described in Patent Document 1 has the problem that it is not easy to efficiently dry the entire large amount of wood biomass fuel stored in the wood biomass fuel storage yard. [Means for solving the problem]

[0006] The present invention was created in view of the above circumstances and with the aim of solving these problems, and the invention of claim 1 comprises a supply unit for which raw biomass is supplied from the outside, a drying unit for drying the raw biomass, and a conveyor for transporting the raw biomass supplied to the supply unit to the drying unit, wherein the drying unit has a heater that blows hot air against the direction of transport of the raw biomass by the conveyor. Furthermore, a plate material is attached to the bottom surface of the supply unit and the drying unit, with multiple holes formed therein to allow the powder generated when the raw biomass is transported by the conveyor to fall by its own weight. This biomass drying apparatus is characterized by the following features. Furthermore, the invention of claim 2 is a biomass drying apparatus according to claim 1, comprising a conveying unit provided between the supply unit and the drying unit, which conveys the raw biomass supplied to the supply unit to the drying unit, wherein the conveying unit is formed to have a smaller cross-sectional area in the direction perpendicular to the conveying direction than the supply unit. It has a second wall portion and a first wall portion provided downstream of the second wall portion, which has a smaller cross-sectional area in the direction perpendicular to the conveying direction than the second wall portion.The heater is characterized by supplying hot air from the drying section to the supply section via the conveying section. Furthermore, the invention of claim 3 is characterized in that, in the biomass drying apparatus according to claim 1 or 2, the supply unit is provided with a discharge unit for discharging air containing moisture generated from the raw biomass. Furthermore, the invention of claim 4 is characterized in that, in the biomass drying apparatus according to claim 1 or 2, the heater comprises an intake fan for drawing in outside air and a heat exchanger for heating the outside air drawn in by the intake fan to produce hot air, and the heat exchanger supplies hot air to the raw biomass being transported to the drying section by the conveyor. Furthermore, the invention of claim 5 is a biomass drying apparatus according to claim 1 or 2, wherein the heater is When generating combustible gas from raw biomass, It is characterized by generating warm air using heat. Furthermore, the invention of claim 6 is characterized in that, in the biomass drying apparatus described in claim 1, the supply unit and the drying unit are each formed in a box shape and are movable and assembled. Furthermore, the invention of claim 7 is characterized in that, in the biomass drying apparatus described in claim 2, the supply unit is formed in a box shape and is a movable, modular type, and the drying unit is formed in a box shape together with the transport unit and is a movable, modular type. Furthermore, the invention of claim 8 is characterized in that, in the biomass drying apparatus according to claim 1 or 2, the raw material biomass is wood chips. [Effects of the Invention]

[0007] According to the invention of claim 1, the raw biomass is dried by blowing hot air against the direction of conveyance of the raw biomass by the conveyor. Furthermore, the bottom surface of the supply and drying sections is fitted with a plate material having multiple holes formed therein to allow the powder generated when the raw biomass is transported by the conveyor to fall by its own weight. Therefore, the large quantities of raw biomass supplied to the supply unit can be dried sequentially and efficiently. According to the invention of claim 2, the cross-sectional area in the direction perpendicular to the conveying direction is formed to be smaller than that of the supply section. It has a second wall portion and a first wall portion provided downstream of the second wall portion, which has a smaller cross-sectional area in the direction perpendicular to the conveying direction than the second wall portion.The system is configured to transport raw biomass from the supply unit to the drying unit by passing it through a conveying unit. Therefore, the amount of raw biomass supplied to the supply unit that is transported by the conveyor can be controlled to a predetermined amount in the conveying unit, allowing for the efficient sequential drying of large quantities of raw biomass. According to the invention of claim 3, before the large amount of raw biomass supplied to the supply unit is transported to the drying unit and dried, the moisture-containing air generated from this raw biomass can be discharged from the discharge unit, thereby improving the drying efficiency of this raw biomass. According to the invention of claim 4, the hot air drawn in by the intake fan and heated by the heat exchanger is supplied to the raw biomass being transported to the drying section by the conveyor. Therefore, the necessary configuration for efficiently drying the raw biomass can be realized with a simple configuration. According to the invention of claim 5, When generating combustible gas from raw biomass, Because it uses a heater that generates hot air using heat, there is no need to generate heat in this heater, which simplifies the structure of the drying section and reduces the energy consumption required to dry the raw biomass. According to the invention of claim 6, since the supply unit and the drying unit are each formed in a box shape and are movable and assembled, the supply unit and the drying unit can be removed and moved to any position as needed and reassembled. According to the invention of claim 7, the supply unit is formed in a box shape and is a movable, modular assembly type, and the drying unit is formed in a box shape together with the conveying unit and is a movable, modular assembly type. Therefore, as needed, the drying unit and conveyed goods can be removed from the supply unit, moved to any location, and reassembled. According to the invention of claim 8, a large quantity of chip-shaped wood pieces supplied to the supply unit can be dried sequentially and efficiently. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram of a biomass power generation system. [Figure 2] This is a schematic front view showing the internal structure of the chip drying apparatus. [Figure 3] This is a schematic plan view showing the internal structure of the chip drying apparatus. [Figure 4] It is a front view showing a chip drying device. [Figure 5] It is a rear view showing a chip drying device. [Figure 6] It is a schematic configuration diagram showing a gasification unit.

Mode for Carrying Out the Invention

[0009] Hereinafter, an embodiment of the present invention will be described based on the drawings.

[0010] <Overall Configuration> In FIG. 1, the biomass power generation system 1 is a power generation system that uses the wood chip A, which is a raw material biomass obtained by processing, for example, wood into chips with a side length of about 10 cm, as an energy source. This biomass power generation system 1 includes a biomass gasification system 2 that generates combustible gas G from the wood chip A, and a gas engine power generation unit 3 as a generator that burns the generated combustible gas G to generate electricity. The biomass gasification system 2 includes a chip drying unit 4 that dries the wood chip A, and a gasification unit 5 that generates combustible gas G from the wood chip A dried by the chip drying unit 4.

[0011] On the downstream side of the gasification unit 5, a gas conditioning unit 6 that purifies the combustible gas G generated by the gasification unit 5 is installed. The gas conditioning unit 6 includes a gas filter 6A installed on the downstream side of the gasification unit 5. The gas filter 6A removes by-products contained in the combustible gas G generated by the gasification unit 5, and is a by-product removal device that filters the combustible gas G by combining wet gas cleaning and cooling. Further, the gas filter 6A is configured such that, for example, high-temperature cooling water W1 at 60°C and low-temperature cooling water W2 at 30°C are respectively supplied, and the combustible gas G is filtered while circulating these high-temperature cooling water W1 and low-temperature cooling water W2 as cooling water.

[0012] On the downstream side of the gas filter 6A, an electrostatic precipitator 6B as a gas conditioning device for removing fine substances contained in the combustible gas G from which by-products have been removed by the gas filter 6A is installed. The electrostatic precipitator 6B is a wet electrostatic precipitator that collects fine substances remaining in the combustible gas G. Further, the gas filter 6A and the electrostatic precipitator 6B each have a cooling system for circulating and cooling the circulating water W3. The circulating water W is configured to be sent to the water treatment device 6C. The water treatment device 6C is a purification device that removes by-products contained in the circulating water W1 and purifies the circulating water W1.

[0013] On the downstream side of the electrostatic precipitator 6B, a gas engine power generation unit 3 is installed. In short, the combustible gas G generated by the gasification unit 5 is configured to be supplied to the gas engine power generation unit 3 after by-products are removed by the gas filter 6A and fine substances are removed by the electrostatic precipitator 6B. The gas engine power generation unit 3 includes a gas engine 3a that burns and drives the combustible gas G, and a generator 3b that is driven by the gas engine 3a. A heat exchange unit 7 is attached to the gas engine power generation unit 3 as a utility for utilizing waste heat generated during combustion of the combustible gas G by the gas engine 3a and during power generation by the generator 3b. The heat exchange unit 7 includes a high-temperature heat exchange unit 7A and a low-temperature heat exchange unit 7B.

[0014] The high-temperature heat exchange unit 7A is connected to the gas engine power generation unit 3, as well as the chip drying unit 4, the gasification unit 5, and the gas filter 6A. Specifically, the high-temperature heat exchange unit 7A is supplied with high-temperature cooling water W1, for example, at 90°C, discharged from the gas engine power generation unit 3, the gasification unit 5, and the gas filter 6A, and this high-temperature cooling water W1 is supplied to the air-cooled heat exchanger 4b of the chip drying unit 4. The air-cooled heat exchanger 4b uses the supplied high-temperature cooling water W1 as a heat source to heat the air to create hot air, and dries the wood chips A with this hot air. The air-cooled heat exchanger 4b is configured such that the high-temperature cooling water W1 is cooled to, for example, 60°C through heat exchange, and then circulated again to the gas engine power generation unit 3, the gasification unit 5, and the gas filter 6A via the high-temperature heat exchange unit 7A.

[0015] The low-temperature heat exchange unit 7B is connected to the gas filter 6A and is configured to supply the waste heat generated when the gas filter 6A is operating to the chip drying unit 4. Specifically, the low-temperature heat exchange unit 7B is supplied with low-temperature cooling water W2, for example at 40°C, discharged from the gas filter 6A. This low-temperature cooling water W2 is cooled to, for example, 30°C through heat exchange and then circulated back to the gas filter 6A. The low-temperature heat exchange unit 7A then performs heat exchange using the low-temperature cooling water W2 as a heat source, and uses this heat source to heat the air to create hot air. This hot air is then supplied to the chip input section 11c of the chip drying unit 4 via the air hose 7a, pre-drying the wood chips A accumulated in the chip input chamber 11c.

[0016] A methanation unit 8 is attached to the gas engine power generation unit 3. The methanation unit 8 is powered by electricity generated by the gas engine power generation unit 3 or by solar power generation (not shown). The methanation unit 8 synthesizes methane gas (flammable gas: CH4) from carbon dioxide (CO2) in the exhaust gas emitted by the power generation of the gas engine power generation unit 3 and hydrogen (H2) produced by electrolysis. Furthermore, the methanation system 8 supplies the synthesized methane gas to the gas engine power generation unit 3 and uses it as fuel for power generation to drive the gas engine 3a of the gas engine power generation unit 3.

[0017] Furthermore, the methanation system 8 supplies oxygen (O2) generated by electrolysis to the gasification unit 5, and this oxygen is used when the gasification unit 5 generates combustible gas G. In short, the methanation unit 8 has the function of contributing to the reduction of carbon dioxide for the prevention of global warming by recycling and utilizing carbon dioxide.

[0018] <Chip drying unit> Next, the chip drying unit 4 is a biomass drying apparatus equipped with at least two input container sections 11 and drying container sections 12, as shown in Figures 2 to 5. The input container section 4A and the drying container section 4B are formed in the same rectangular parallelepiped shape with their longitudinal direction in the horizontal direction, and are assembled into a modular unit that is separable, removable, and movable. These input container section 11 and drying container section 12 are formed in the shape of a box, for example, with a length of 5975 mm, a height of 2480 mm, and a depth of 2130 mm. In the following description, unless otherwise specified, the right side of Figure 2 will be defined as the downstream side and the left side as the upstream side.

[0019] The drying container section 12 has an internal height dimension of, for example, 1874 mm. A control chamber 12a is provided downstream of the drying container section 12, and a ventilation passage 12c for passing dry air is provided on the bottom surface 12b upstream of the control chamber 12a. A plate material 12d with multiple holes, such as perforated metal, is attached to the ventilation passage 12c. On the plate material 12d, a drying chamber 12e, which serves as a drying section for drying wood chips A, and a heat exchange chamber 12f for supplying hot air to the drying chamber 12e are separated. The heat exchange chamber 12f is provided above the drying chamber 12e. The upper sides of the control chamber 12a and the heat exchange chamber 12f are closed off by a top plate 12g.

[0020] Furthermore, an adjustment chamber 12h is provided upstream of the heat exchange chamber 12f and the drying chamber 12e to adjust the amount of wood chips A being transported. The adjustment chamber 12h is a transport section for transporting wood chips A that have been introduced into the chip input chamber 11c to the drying chamber 12e. Specifically, the adjustment chamber 12h is the space between a first wall 12i, which is an extension of the upstream side of the heat exchange chamber 12f, and a second wall 12j, which is a cutout at the bottom of the upstream side of the drying container section 12. The first wall 12i extends downward from the top plate 12g of the drying container section 12 by, for example, about 1440 mm, and the second wall 12j extends downward from the top plate 12g of the drying container section 12 by, for example, about 1050 mm.

[0021] The gap between the first wall 12i and the plate material 12d is 434 mm, and the gap between the second wall 12j and the plate material 12d is 824 mm. In short, the first wall 12i extends downward from the second wall 12j, which is located downstream of the chip input chamber 11c. The adjustment chamber 12h is formed with a smaller opening cross-sectional area in the direction perpendicular to the transport direction H than the chip input chamber 11c due to the first wall 12i and the second wall 12j. The second wall 12j is provided with multiple ventilation holes 12k.

[0022] Furthermore, an intake fan 4a and an air-cooled heat exchanger 4b are installed in the heat exchange chamber 12f. The intake fan 4a is installed on the upper side of the heat exchange chamber 12f and is configured to introduce outside air into the heat exchange chamber 12f. The air-cooled heat exchanger 4b is a heater and is installed on the bottom surface of the heat exchange chamber 12f. The heat exchange chamber 12f is configured to take in outside air using the intake fan 4a and send it to the air-cooled heat exchanger 4b, where the taken-in air is heated to produce hot air, and this hot air is supplied from the heat exchange chamber 12f to the drying chamber 12e. The drying chamber 12e is configured to blow the hot air supplied from the heat exchange chamber 12f onto the input container section 11 by passing it under the first wall section 12i and the second wall section 12j.

[0023] Furthermore, a chip discharge port 12m is provided at the bottom of the downstream side of the drying chamber 12e, penetrating downwards. Below the chip discharge port 12m, a chip discharge device 12n is installed, consisting of a discharge window, such as a gate, door, or conveyor, for discharging wood chips A. The chip discharge device 12n can be, for example, a manually operated discharge window, or a discharge window or screw conveyor whose drive is mechanically controlled based on changes in the supply amount of wood chips A caused by changes in the internal temperature of the gasification furnace 5a. Downstream of the chip discharge device 12n, a chip conveying conveyor 9 is installed as a conveyor for transporting the wood chips A discharged by the chip discharge device 12n. The chip conveying conveyor 9 transports the wood chips A discharged by the chip discharge device 12n to the gasification furnace 5a and introduces them into the gasification furnace 5a.

[0024] On the other hand, the input container section 11 has boards 11b attached to its bottom surface 11a at predetermined intervals. The boards 11b are attached to the same height as the boards 12d of the drying container section 12. A chip conveying device 4c for transporting wood chips A to the drying chamber 12e is installed on the boards 11b. The space above the chip conveying device 4c is the chip input chamber 11c, which serves as a hopper section into which wood chips A are fed. The top of the chip input chamber 11c is open, forming an opening 11d. The opening 11d allows air containing moisture generated from the wood chips A fed into the chip input chamber 11c to be discharged, and as shown in Figure 2, hot air is supplied from an air hose 7a, with its downstream end inserted into the upstream side of the opening 11d. The input container section 11 is configured such that a predetermined amount of wood chips A is appropriately fed into the chip input chamber 11c from the opening 11d by a transporter T, such as a forklift, for example.

[0025] The chip conveying device 4c is installed on the board material 11b,12d extending from a position upstream of the input container section 11 to the drying chamber 12e of the drying container section 12. Specifically, as shown in Figure 2, the chip conveying device 4c has a plurality of movable blades 4d mounted at predetermined intervals, for example, 1020 mm, in the conveying direction H of the chip conveying device 4c. Each movable blade 4d has a substantially vertical locking surface 4e on the downstream side in the conveying direction H, and an inclined surface 4f on the upstream side in the conveying direction H. These plurality of movable blades 4d are claws that reciprocate along the conveying direction H by a drive device 4g installed in the control chamber 12a of the drying container section 12, and are configured to gradually convey a large amount of wood chips A that has been input into the chip input chamber 11c in the conveying direction H. The drive device 4g is composed of, for example, a hydraulic cylinder and a hydraulic pump that drives this hydraulic cylinder.

[0026] A fixed blade 4h is attached to the upstream side of each movable blade 4d of the chip conveying device 4c. The fixed blade 4h is fixed on the plate material 11b, 12d, and, similar to the movable blade 4d, the downstream side in the conveying direction H is formed as a substantially vertical locking surface 4i, and the upstream side in the conveying direction H is formed as an inclined surface 4j that slopes upstream. Each fixed blade 4h has the function of making the conveying of wood chips A by each movable blade 4d more efficient by changing the distance between it and the movable blades 4d when the movable blades 4d move back and forth along the conveying direction H.

[0027] In short, when the wood chips A transported by the chip transporter 4c are transported from the chip input chamber 11c to the adjustment chamber 12h, the amount of transport is first reduced at the second wall section 12j. Furthermore, when the wood chips A are transported from the adjustment chamber 12h to the drying chamber 12e, the amount of transport is further reduced at the first wall section 12i. Then, the wood chips A are supplied from the drying chamber 12e to the adjustment chamber 12h and the chip input chamber 11c by hot air supplied downward from the air-cooled heat exchanger 4b, which passes under the first wall section 12i and the second wall section 12j and is supplied upstream. As a result, the wood chips A are blown with hot air against the transport direction H of the chip transporter 4c and are continuously dried as they are transported by the chip transporter 4c.

[0028] <Gasification Unit> Next, as shown in Figure 6, the gasification unit 5 has a substantially cylindrical gasification furnace 5a installed with its axial direction oriented vertically. The gasification furnace 5a comprises a substantially cylindrical outer wall portion 5b and an inner wall furnace 5c concentrically housed within the outer wall portion 5b. The outer wall portion 5b has a heat-shielded structure made of heat-resistant material, with its upper side closed, and an openable and closable maintenance opening 5d for inspection is provided on the upper periphery of the outer wall portion 5b. At the upper end of the outer wall portion 5b, there is an inlet 5e to which the downstream side of a chip conveying conveyor 9 for transporting wood chips A dried in the chip drying unit 4 to the gasification furnace 5a is connected. The inlet 5e is located at the center of the upper part of the outer wall portion 5b, and the wood chips A are sequentially supplied and introduced into the inner wall furnace 5c from the upper side of the outer wall portion 5b.

[0029] Multiple air intake ports 5f are provided on the outer periphery of the outer wall portion 5b to supply outside air (air) into the inner wall furnace 5c. These air intake ports 5f are provided in multiple rows, for example, three rows, at predetermined intervals along the axial direction, near the upper part of the outer wall portion 5b. Air intake ports 5f are also provided near the lower part of the outer wall portion 5b. Furthermore, multiple air intake ports 5f are provided at equal intervals in the circumferential direction of the outer wall portion 5b, for example, two in total. In short, there are, for example, about eight air intake ports 5f in total. Moreover, each air intake port 5f penetrates from the outside of the outer wall portion 5b into the inner wall furnace 5c, and is configured to draw outside air from around the gasification furnace 5a into the inner wall furnace 5c.

[0030] An inspection window 5g is provided on the outer perimeter of the outer wall 5b to check the condition of the outside air taken in from the air intake port 5f. These inspection windows 5g are positioned at the same height as the three air intake ports 5f installed on the upper side of the outer wall 5b, and are located between the air intake ports 5f installed at the same height. In addition, a gas outlet 5h is provided on the outer perimeter of the outer wall 5b for discharging the combustible gas G generated in the inner wall furnace 5c. The gas outlet 5h is located approximately in the middle of the height of the outer wall 5b and is connected to the gas filter 6A of the gas conditioning unit 6.

[0031] On the other hand, the inner wall furnace 5c has a structure that is heat-shielded by a heat-resistant material, and has an inclined section 5i that gradually narrows in diameter concentrically at the bottom. At the center of this inclined section 5i in the height direction, an annular internal exhaust port 5j is formed to discharge the combustible gas G generated in the inner wall furnace 5c into the space between the outer wall section 5b and the inner wall furnace 5c. The internal exhaust port 5j is formed in an annular shape along the circumferential direction of the inner wall furnace 5c, and is configured to eject the combustible gas G generated in the inner wall furnace 5c upward along the inclined section 5i of the inner wall furnace 5c. The space between the inner wall furnace 5c and the outer wall section 5b is configured as a retention space S, which is a retention path for circulating the combustible gas G and allowing it to remain there for a predetermined period of time.

[0032] A lower discharge port 5k is provided at the lower end of the inner wall furnace 5c, formed by opening the lower end of the inner wall furnace 5c concentrically. The lower discharge port 5k allows ash C and other materials generated in conjunction with the generation of combustible gas G inside the inner wall furnace 5c to fall freely downward and be discharged. The space between the lower discharge port 5k and the outer wall portion 5b is sealed and airtight with an annular plate. An ash collection mechanism 5m is attached to the lower discharge port 5k to collect ash C inside the inner wall furnace 5c and discharge it downward. The ash collection mechanism 5m has a rotating body 5n that is concentrically attached to the center of the lower discharge port 5k and is circumferentially rotatable. Specifically, the ash collection mechanism 5m is configured such that the rotation of the rotating body 5n moves the ash C accumulated inside the inner wall furnace 5c toward the outer circumference of the rotating body 5n to collect it, and this collected ash C is discharged downward through the gap between the outer edge of the rotating body 5n and the lower discharge port 5k.

[0033] Furthermore, the lower part of the outer wall 5b is closed, and an ash discharge port 5p is provided on the lower periphery of the outer wall 5c. Below the ash discharge port 5p, an ash discharge conveyor 5q is installed as an ash transport device to sequentially transport the ash C discharged from the ash discharge port 5p. In short, the ash C collected at the bottom of the inner wall furnace 5c and discharged from the lower discharge port 5k is transported from the ash discharge port 5p to the ash discharge conveyor 5q, and then transported to the storage tank 5r by this ash discharge conveyor 5q.

[0034] Next, within the inner wall furnace 5c of the gasification furnace 5a, the phenomena occurring in each of the three spaces differ: the uppermost first reaction space R1 (absolutely dry region), the second reaction space R2 (heating region) located below the first reaction space R1, and the third reaction space R3 (gasification region) located below the second reaction space R2. The first reaction space R1 corresponds to the space inside the uppermost air intake port 5f, where the internal temperature is heated to between 100°C and 200°C, drying the wood chips A introduced from the inlet port 5e until they are completely dry (almost completely free of moisture).

[0035] The second reaction space R2 corresponds to the space inside the second air intake 5f from the top. Outside air is introduced from the air intake 5f, and the surface of the wood chips A, which have been completely dried in the first reaction space R1, is partially burned to heat the wood chips A to a temperature at which they can be thermally decomposed, in other words, to an internal temperature of 200°C to 600°C. The third reaction space R3 corresponds to the space below the inside of the third air intake 5f from the top. The amount of outside air drawn in from the air intake 5f is controlled to prevent an excess of oxygen, and the oxygen in the outside air introduced into the inner wall furnace 5c is eliminated, maintaining a reducing atmosphere with an internal temperature of 800°C to 1000°C, which thermally decomposes the heated wood chips A and generates flammable gas G.

[0036] Furthermore, the retention space S of the gasification furnace 5a is configured such that flammable gas G generated in the third reaction space R3 is introduced from the internal outlet 5j, and this flammable gas G remains at a temperature of 600°C to 800°C for a predetermined time. During this time, at least a portion of the tar content remaining in the flammable gas G is modified and reduced in molecular weight by the retention space S, resulting in flammable gas G. The flammable gas G, with its tar content modified, is then discharged from the gas outlet 5h and supplied to the gas engine 3a of the gas engine power generation unit 3 via the gas conditioning unit 6.

[0037] <Operation> Next, the operation of the biomass power generation system 1 according to the above embodiment will be explained with reference to the drawings.

[0038] (drying process) As shown in Figures 1 and 2, first, a predetermined amount of wood chips A, which are approximately 10 cm on each side and processed from logs, etc., are stored in a predetermined storage area (not shown) from which a predetermined amount of wood chips A are fed into the chip drying unit 4 through the opening 11d of the input container section 11 using a transporter T, and the predetermined amount of wood chips A are stored in the chip input chamber 11c of the input container section 11. At this time, the wood chips A stored in the chip input chamber 11c are pre-dried (pre-dried) by being blown with hot air supplied from the air hose 7a.

[0039] In this state, the chip drying unit 4 is driven. Then, outside air is drawn in from the intake fan 4a, and this drawn-in outside air is heat-exchanged in the air-cooled heat exchanger 4b to become hot air, which is then supplied to the drying chamber 12e. The wood chips A stored in the chip input chamber 11c are then gradually transported downstream by the chip transport device 4c to the adjustment chamber 12h and the drying chamber 12e. At this time, the amount of wood chips A transported from the chip input chamber 11c to the adjustment chamber 12h by the chip transport device 4c is suppressed and adjusted by the second wall section 12j, so that a predetermined amount of wood chips A is gradually transported to the adjustment chamber 12h. Furthermore, the amount of wood chips A transported from the adjustment chamber 12h to the drying chamber 12e is further suppressed and adjusted by the first wall section 12i, so that a predetermined amount of wood chips A suitable for drying in the drying chamber 12e is gradually transported to the drying chamber 12e.

[0040] At this time, the wood chips A have a certain size, and these wood chips A are transported by the chip transporter 4c with a predetermined gap between them during transport. Therefore, the hot air supplied to the drying chamber 12e flows in a direction against the transport direction H of the wood chips A, in other words, from the drying chamber 12e to the adjustment chamber 12h and the chip input chamber 11c (from downstream to upstream), passing through the wood chips A that are gradually transported by the chip transporter 4c, and efficiently drying these wood chips A, for example, wood chips A with a moisture content of 40% to 50% to a moisture content of 10% or less.

[0041] (Powder discharge process) Here, as the wood chips A are transported by the chip conveying device 4c, the wood powder P generated by the wood chips A rubbing against or colliding with each other falls through multiple holes in the plate body 12d due to its own weight and into the ventilation passage 12c. The wood powder P that falls into the ventilation passage 12c then proceeds downstream of the ventilation passage 12c and is discharged to the outside. Furthermore, the wood chips A that have been transported by the chip conveying device 4c and dried in the drying chamber 12e are transported downstream of the drying chamber 12e and discharged from the chip discharge port 12m to the chip conveying conveyor 9 by the chip discharge device 12n.

[0042] (Introduction process) The wood chips A discharged onto the chip conveyor 9 are then transported by the chip conveyor 9 to the inlet 5e of the gasification unit 5, and from this inlet 5e they are sequentially introduced and supplied into the inner wall furnace 5c of the gasification unit 5.

[0043] (Initial process) In this case, during the initial operation of the gasification unit 5, a predetermined amount of wood chips A are introduced into the inner wall furnace 5c of the gasification unit 5 and piled up. Then, while adjusting the amount of outside air drawn in from each air intake port 5d, the gasification process in the gasification unit 5 is started (driven) by burning the wood chips A through a predetermined inspection window 5g using an ignition device (not shown), such as a gas burner.

[0044] (Heating process) Then, each wood chip A transported to the gasification unit 5 is heated to a predetermined temperature of 100°C to 200°C in the first reaction space R1 located at the uppermost part of the inner wall furnace 5c, and dried until completely dry. In the first reaction space R1, the temperature of the first reaction space R1 is maintained at the predetermined temperature by the heat generated by the combustion of the wood chip A in the second reaction space R2 located below the first reaction space R1.

[0045] Next, each wood chip A, which has been completely dried in the first reaction space R1, is gasified in the inner wall furnace 5c and ultimately falls downward as ash C, which is the remaining material. In short, these wood chips A move to the second reaction space R2 by their own weight. Then, the wood chips A that have moved to the second reaction space R2 are partially burned on the surface by oxygen (O2) from the outside air introduced into the inner wall furnace 5c through the air intake 5f, and are heated to a temperature at which these wood chips A can be thermally decomposed, that is, a predetermined temperature between 200°C and 600°C.

[0046] (Gasification process) Furthermore, the wood chips A, heated to a temperature at which they can be thermally decomposed in the second reaction space R2, then move to the third reaction space R3 by their own weight. At this time, in the third reaction space R3, the combustion of the wood chips A in the second reaction space R2 causes the oxygen (O2) in the outside air introduced into the inner wall furnace 5c to disappear. Then, each wood chip A that has moved to the third reaction space R3 is kept at an internal temperature of 800°C to 1000°C, maintaining a reducing atmosphere. As a result, the wood chips A are thermally decomposed and gasified, generating combustible gas G.

[0047] Here, gasification in the third reaction space R3 generates carbon monoxide (CO) as a combustible gas G, and simultaneously generates carbon dioxide (CO2), which is an unwanted substance. At the same time, wood chips A polymerize, producing charcoal as a solid with a high number of carbon atoms. Furthermore, thermal decomposition and reduction reactions of hydrocarbons contained in wood chips A occur, leading to condensation polymerization reactions due to incomplete combustion and thermal decomposition of the organic matter in wood chips A, and generating tar (polycyclic aromatic hydrocarbons: PHAs), which are impurities.

[0048] (ash collection process) Here, the ash C generated by the combustion of wood chips A in the second reaction space R2 and the gasification of wood chips A in the third reaction space R3 falls downward to the inner wall furnace 5c due to its own weight. This ash C is moved outward and collected at the bottom of the inner wall furnace 5c by the rotation of the rotating body 5n of the ash collection mechanism 5m.

[0049] (discharge process) Subsequently, the ash C collected by the ash collection mechanism 5n is discharged into the outer wall section 5b through the gap between the rotating body 5n and the lower discharge port 5k. Furthermore, the ash C discharged into the outer wall section 5b is discharged from the ash discharge port 5p to the ash discharge conveyor 5q, and is transported to the storage tank 5r by this ash discharge conveyor 5q for storage.

[0050] (Tar content modification process) Furthermore, the flammable gas G generated in the third reaction space R3 is discharged from inside the inner wall furnace 5c through the internal outlet 5j into the retention space S. This flammable gas G then circulates around the retention space S in a predetermined direction for a predetermined time while maintaining a relatively low temperature, for example, between 600°C and 800°C. During this time, the tar remaining in the flammable gas G is reformed to become flammable gas (syngas: a mixed gas of carbon monoxide (CO) and hydrogen (H2)) G. Here, the modification of the tar component involves reducing the number of carbon atoms in the various components that make up the tar component, such as PAHs (benzo[a]pyrene, benzo[a]anthracene, anthracene, etc.), nitro PAHs (2-nitrofluorene, 1-nitropyrene, etc.), and PAH quinones (1,2-naphthoquinone, 9,10-anthraquinone, etc.), essentially reducing the molecular weight, thereby creating a high-quality flammable gas that can maintain a gaseous state even at relatively low temperatures.

[0051] (Derivation process) Then, the combustible gas G, whose tar content has been modified in the retention space S, is, for example, 350 Nm³ 3 / h or more 800Nm 3 The gas is generated at a rate of approximately / h and discharged from the gas outlet 5h of the gasifier 5a, and supplied to the gas filter 6A of the gas conditioning unit 6.

[0052] (By-product removal process) Subsequently, the flammable gas G supplied to the gas filter 6A is supplied to the electrostatic precipitator 6B after the by-products contained in the flammable gas G are removed by the gas filter 6A.

[0053] (Minute substance removal process) Furthermore, the flammable gas G supplied to the electrostatic precipitator 6B is supplied to the gas engine 3a of the gas engine power generation unit 3 after the fine particles contained in the flammable gas G are removed by the electrostatic precipitator 6B.

[0054] (Power generation process) In the gas engine power generation unit 3, the supplied combustible gas G is burned in the gas engine 3a, which drives the accompanying generator 3b to generate a predetermined amount of electricity. At this time, the generator 3b generates electricity with a rated output of, for example, 250kW to 750kW, and also outputs a heat output of, for example, 500kW to 1500kW.

[0055] (Methanation process) Furthermore, the exhaust gas generated by the gas engine power generation unit 3, specifically the combustion of combustible gas G in the gas engine 3a, is supplied to the methanation unit 8. In this methanation unit 8, methane gas (combustible gas: CH4) is synthesized from carbon dioxide (CO2) contained in the supplied exhaust gas and hydrogen (H2) produced by electrolysis. At this time, it is also possible to supply this synthesized methane gas to the gas engine power generation unit 3 and use it as combustible gas G when generating electricity in the gas engine power generation unit 3 (optional function).

[0056] (Heat exhaust process 1) Furthermore, the heat generated during power generation in the gas engine power generation unit 3, gasification in the gasification unit 5, and by-product removal in the gas filter 6A is heat-exchanged with high-temperature cooling water W1 supplied from the high-temperature heat exchange unit 7A and then discharged. This heat-exchanged high-temperature cooling water W1 is then discharged, for example, in a volume of 20 m³. 3 / h or more 40m 3 The high-temperature cooling water W1 is supplied to the high-temperature heat exchange unit 7A at a supply rate of less than / h and circulated. Subsequently, the high-temperature cooling water W1 is supplied from the high-temperature heat exchange unit 7A to the air-cooled heat exchanger 4b of the chip drying unit 4, where it is used as a heat source for the air-cooled heat exchanger 4b and heat exchange takes place.

[0057] Through heat exchange in this air-cooled heat exchanger 4b, the outside air (air) drawn into the heat exchange chamber 12f by the intake fan 4a is heated and turned into hot air. This hot air is supplied to the drying chamber 12a, where the wood chips A transported to the drying chamber 12a are dried. Furthermore, the high-temperature cooling water W1 that has undergone heat exchange in the air-cooled heat exchanger 4b is again supplied to the gas engine power generation unit 3, the gasification unit 5, and the gas filter 6A via the high-temperature heat exchange unit 7A and circulated.

[0058] (Heat exhaust process 2) Furthermore, the low-temperature cooling water W2 discharged from the gas filter 6A is supplied to the low-temperature heat exchange unit 7B. In this low-temperature heat exchange unit 7B, heat exchange is performed using the low-temperature cooling water W2 as a heat source, and this heat exchange warms the air to generate hot air. This hot air is supplied via the air hose 7a to the chip input chamber 11c of the chip drying unit 4, where the wood chips A accumulated in the chip input chamber 11c are pre-dried.

[0059] <Effects and Effects> (Gasification) As described above, the biomass power generation system 1 according to this embodiment is configured such that the combustible gas G generated from wood chips A in the inner wall furnace 5c of the gasification unit 5 is retained for a predetermined time in the retention space S between the inner wall furnace 5c and the outer wall 5b, thereby reforming the tar content in the combustible gas G into combustible gas G. As a result, the amount of tar content in the combustible gas G can be reduced as much as possible, and the generation of tar can be suppressed.

[0060] Therefore, the adhesion of tar to equipment such as piping, and to the cylinders and plugs of the gas engine 3a of the gas engine power generation unit 3 driven by the generated flammable gas G, can be reduced, and the frequency of maintenance of equipment through which the flammable gas G passes, such as the gas engine 3a, can be reduced. At the same time, energy loss during power generation due to the adhesion of tar can be reduced. As a result, stable operation of the gas engine power generation unit 3 over a long period of time is possible. At the same time, since the tar contained in the flammable gas G is modified to produce flammable gas G, the utilization efficiency of the flammable gas G can be improved in a productive manner, and the power generation efficiency of the gas engine power generation unit 3 can be improved.

[0061] In particular, the gasification unit 5 is configured such that the surface of the wood chips A is partially burned in the second reaction space R2, thereby heating the internal temperature of the inner wall furnace 5c to a temperature at which the wood chips A can be thermally decomposed. Therefore, the inside of the gasification furnace 5a can be heated to the temperature necessary for the thermal decomposition of the wood chips A without using a separate heating device such as a boiler, and thus the heating of the inside of the gasification furnace 5a to the temperature necessary for the thermal decomposition of the wood chips A can be carried out continuously with a simple configuration.

[0062] Furthermore, by adjusting the amount of outside air intake from each vent 5f of the gasifier 5a, the temperature of the second reaction space R2 can be heated to a temperature between 200°C and 600°C at which the wood chips A can be thermally decomposed by the partial combustion of the surface of the wood chips A in the second reaction space R2 within the gasifier 5a. The internal temperature of the third reaction space R3 of the gasifier 5a can be maintained in a reducing atmosphere state between 800°C and 1000°C, allowing the wood chips A to be thermally decomposed and combustible gas G to be generated. The temperature of the combustible gas G in the retention space S of the gasifier 5a can be set to between 600°C and 800°C at which the remaining tar can be reformed. Therefore, the residence time of the combustible gas G supplied to and retained in the retention space S of the gasifier 5a can be adjusted without separately providing a heating device such as a boiler, and the tar remaining in this combustible gas G can be appropriately reformed to produce combustible gas.

[0063] Furthermore, within the gasification furnace 5a, oxygen from the outside air drawn in through the vent 5f is eliminated by the combustion of wood chips A in the second reaction space R2, and a reducing atmosphere is formed in the third reaction space R3. Simultaneously, combustible gas G is retained and circulated in the retention space S of the gasification furnace 5a, and the residual tar is efficiently modified into combustible gas G over a predetermined period of time. As a result, in addition to the combustible gas G produced by the thermal decomposition of wood chips A, the tar generated by this thermal decomposition can also be converted into combustible gas G, thus enabling efficient production of combustible gas G and efficient modification of the residual tar in the combustible gas G with a simple configuration. In short, without using external heat, the heat obtained by partially burning the wood chips A itself is used to thermally decompose the wood chips A, and the tar generated by this thermal decomposition can be modified into combustible gas G.

[0064] Furthermore, the ash C generated by the combustion and thermal decomposition of wood chips A within the gasifier 5a and accumulated at the bottom of the gasifier 5a is collected by an ash collection mechanism 5m attached to the lower discharge port 5k of the gasifier 5a and discharged from the ash discharge port 5p. The ash C discharged from the ash discharge port 5p is then continuously discharged to the storage tank 5r by an ash discharge conveyor 5q for accumulation. As a result, the ash C generated within the gasifier 5a can be continuously and efficiently discharged to the outside of the gasifier 5a, and the ash C accumulated in the storage tank 5r can be easily reused.

[0065] (Drying the chips) Furthermore, the wood chips A are dried in the chip drying unit 4 before being introduced into the gasification unit 5. Therefore, even if the wood chips A are not sufficiently dried, they can be dried in the chip drying unit 4 before being introduced into the gasification unit 5, and the gasification unit 5 can efficiently generate combustible gas G.

[0066] Furthermore, the high-temperature cooling water W1 discharged from the gasification unit 5 is supplied to the high-temperature heat exchange unit 7A, and this high-temperature cooling water W1 is circulated from the high-temperature heat exchange unit 7A to the air-cooled heat exchanger 4b of the chip drying unit 4. The hot air generated by the heat exchange in the air-cooled heat exchanger 4b is used to continuously dry the wood chips A being transported by the chip transporter 4c of the chip drying unit 4. Therefore, the heat required to dry the wood chips A in the chip drying unit 4 can be supplemented by utilizing the waste heat generated when the combustible gas G is produced in the gasification unit 5.

[0067] In short, the thermal energy generated by the production of combustible gas G in the gasification unit 5 is reused to dry the wood chips A. Therefore, compared to drying the wood chips A using a heating device such as a boiler, the wood chips A can be dried efficiently and continuously without using a new heat source, thus enabling energy-efficient drying of the wood chips A. Furthermore, the necessary configuration for efficiently drying the wood chips A can be realized with a simple configuration using an intake fan 5a and an air-cooled heat exchanger 4b. Thus, since there is no need to use a heating device with its own heat-generating function, such as a boiler, the configuration for drying the wood chips A can be simplified, and the energy consumption required for drying the wood chips A can be reduced.

[0068] Furthermore, the system is configured to supply hot air, which has undergone heat exchange in the air-cooled heat exchanger 4b of the chip transport unit 4, from the drying chamber 12e to the adjustment chamber 12h and the chip input chamber 11. As a result, the wood chips A being transported by the chip transport device 4c of the chip drying unit 4 can be dried by blowing hot air in a direction opposite to the transport direction H of the wood chips A. Therefore, a large amount of wood chips A introduced into the chip input chamber 11c can be efficiently dried sequentially while being transported by the chip transport device 4c.

[0069] In particular, the chip transport unit 4 is configured such that the opening cross-sectional area downstream of the chip input chamber 11c is narrowed by the second wall 12j, and the opening cross-sectional area downstream of the adjustment chamber 12h, which is downstream of the chip input chamber 11c, is further narrowed by the first wall 12i. As a result, the wood chips A that are input into the chip input chamber 11c are transported by the chip transport device 4c, and first, as they are transported from the chip input chamber 11c to the adjustment chamber 12h, the amount of wood chips A transported is suppressed and adjusted to a predetermined amount by the second wall 12j, and then as they are transported from the adjustment chamber 12h to the drying chamber 12e, the amount of wood chips A transported is further suppressed and adjusted to a predetermined amount by the first wall 11i before being transported to the drying chamber 12e.

[0070] Therefore, the amount of wood chips A transported by the chip transport device 4c from the large amount of wood chips A introduced into the chip input chamber 11c is gradually suppressed by the first wall section 12i and the second wall section 12j, allowing a predetermined amount of wood chips A with good drying efficiency to be gradually transported to the drying chamber 12e. As a result, a large amount of wood chips A can be efficiently and continuously dried sequentially in the drying chamber 12e.

[0071] Furthermore, low-temperature cooling water W2 is supplied to a low-temperature heat exchange unit 7B to cool the gas filter 7A, which removes by-products contained in the generated combustible gas G. The hot air generated by heat exchange in the low-temperature heat exchange unit 7B using the low-temperature cooling water W2 as a heat source is blown from the air hose 7a onto the wood chips A introduced into the chip input chamber 11c to pre-dry them. As a result, the wood chips A introduced into the chip input chamber 11c can be pre-dried before being dried in the drying chamber 12e, and the moisture-containing air generated from the wood chips A can be discharged to the outside through the opening 11d. Therefore, since the wood chips A can be pre-dried using the waste heat generated by the gas filter 7A without using a heating device such as a boiler, the wood chips A can be dried in an energy-efficient manner, and the drying efficiency of the wood chips A by the chip drying unit 4 can be improved.

[0072] (Unitization) Furthermore, the gasification furnace 5a of the gasification unit 5 is unitized in a removable and movable manner, and the input container section 11 and drying container section 12 of the chip drying unit 4 are each formed in a box shape and are removable, in other words, movable, modular assembly units. Therefore, by disassembling the chip drying unit 4, which has been installed in a predetermined location, into the input container section 11 and the drying container section 12, these input container section 11 and the drying container section 12 can be moved separately. Also, by removing the gasification unit 5 from its installation location, the gasification unit 5 can also be moved.

[0073] Therefore, since each of these components—the gasification unit 5, the input container section 11, and the drying container section 12—can be easily moved, for example by being mounted on a truck, it is easy to move and install them in locations where flammable gas G is needed. In short, the biomass power generation system 1, with its relatively simple configuration using wood chips A, can be easily moved to any region or location where electricity shortages are a concern, such as in the event of an earthquake, and the gasification unit 5, the input container section 11, and the drying container section can be reassembled and installed in a movable manner, thus temporarily compensating for electricity shortages in these regions or locations.

[0074] As described above, the biomass power generation system 1 according to the present invention contributes to solving SDGs goals such as "Goal 7: Affordable and Clean Energy," "Goal 9: Industry, Innovation and Infrastructure," "Goal 11: Sustainable Cities and Communities," "Goal 12: Responsible Consumption and Production," "Goal 13: Climate Action," and "Goal 15: Life on Land."

[0075] (others) It should be noted that the present invention is not limited to the embodiments described above, but includes various variations. For example, the embodiments described above are explained for the purpose of making the present invention easy to understand, and the present invention is not necessarily limited to having all the configurations described above. [Explanation of Symbols]

[0076] 1. Biomass power generation system 2. Biomass Gasification System 3. Gas engine power generation unit 3a Gas engine 3b generator 4 Chip drying unit 4a Intake fan 4b Air-cooled heat exchanger 4c chip transport device 4D movable wings 4e Locking surface 4f slope 4g drive unit 4h fixed wing 4i Locking surface 4j slope 5. Gasification Unit 5a Gasifier 5b Exterior wall 5c inner wall furnace 5d Maintenance port 5e Inlet 5d Air intake 5g inspection window 5h Gas outlet 5i Slope 5j Internal discharge port 5k bottom outlet 5m Ash collection mechanism 5n rotating solid 5p ash outlet 5q Ash discharge conveyor 5r storage tank 6. Gas Conditioning Unit 6A Gas Filter 6B Electrostatic precipitator 6C Water Treatment Equipment 7 Heat exchange unit 7A High-Temperature Heat Exchange Unit 7B Low-temperature heat exchange unit 7a Air hose 8 Methanation Units 9. Chip transport conveyor 11. Input container section 11a Bottom part 11b Board material 11c Chip loading chamber 11d opening 12 Drying container section 12a Control Room 12b Bottom part 12c ventilation channel 12d plate material 12e Drying room 12f heat exchange room 12g Top plate 12h control room 12i 1st wall section 12j 2nd wall section 12k vent 12m chip outlet 12n chip ejection device A Wood chips C Ash G Flammable gas H Conveying direction P wood powder R1 First reaction space R2 Second reaction space R3 Third reaction space S retention space T Transport Machine W1 High temperature cooling water W2 Low-temperature cooling water W3 Circulating water

Claims

1. A supply unit where raw biomass is supplied from an external source, A drying section for drying the raw biomass, The system includes a conveyor that transports the raw biomass supplied to the supply unit to the drying unit, The drying section has a heater that blows hot air against the direction of conveyance of the raw biomass by the conveyor, The bottom surfaces of the supply unit and the drying unit are fitted with plates having multiple holes formed in them to allow powder generated when the raw biomass is transported by the conveyor to fall by its own weight. A biomass drying apparatus characterized by the following features.

2. A conveying unit is provided between the supply unit and the drying unit, and conveys the raw biomass supplied to the supply unit through it to the drying unit. The conveying section has a second wall portion formed to have a smaller cross-sectional area in a direction perpendicular to the conveying direction than the supply section, and a first wall portion provided downstream of the second wall portion and formed to have a smaller cross-sectional area in a direction perpendicular to the conveying direction than the second wall portion. The heater supplies hot air from the drying section to the supply section via the conveying section. The biomass drying apparatus according to claim 1, characterized in that it is a biomass drying apparatus.

3. The supply unit is provided with a discharge unit for discharging air containing moisture generated from the raw biomass. The biomass drying apparatus according to claim 1 or 2, characterized in that it is a biomass drying apparatus.

4. The heater comprises an intake fan for drawing in outside air, and a heat exchanger that heats the outside air drawn in by the intake fan to produce warm air. The heat exchanger supplies hot air to the raw biomass being transported to the drying section by the conveyor. The biomass drying apparatus according to claim 1 or 2, characterized in that it is a biomass drying apparatus.

5. The aforementioned heater generates warm air using the heat produced when combustible gas is generated from the raw biomass. The biomass drying apparatus according to claim 1 or 2, characterized in that it is a biomass drying apparatus.

6. The supply unit and the drying unit are each formed in a box shape and are movable and assembled. The biomass drying apparatus according to claim 1, characterized in that it is a biomass drying apparatus.

7. The supply unit is formed in a box shape and is a movable, modular type. The drying section, together with the transport section, is formed in a box shape and is a movable, modular design. The biomass drying apparatus according to claim 2, characterized in that it is as described above.

8. The raw material biomass is wood chips. The biomass drying apparatus according to claim 1 or 2, characterized in that it is a biomass drying apparatus.

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