Biomass power generation system

Abstract

To provide a system for generating electric power by heating and gasifying woody biomass in a pyrolysis furnace, which can be continuously operated without causing trouble to a plant due to tar because a tar component is sufficiently removed.SOLUTION: The problem is solved by a biomass power generation system including a woody biomass drying means for drying woody biomass, a pyrolysis means for heating the dried woody biomass in a pyrolysis furnace and discharging a pyrolysis gas, a tar component removal means for removing a tar component from the discharged pyrolysis gas, the tar component removal means including a water scrubber for removing the tar component from the pyrolysis gas immediately after being discharged from the pyrolysis furnace, and a power generation means for generating power using the pyrolysis gas from which the tar component has been removed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This relates to a system that heats and gasifies woody biomass in a pyrolysis furnace to generate electricity. [Background technology]

[0002] A system is known in which woody biomass is heated in a pyrolysis furnace and gasified to obtain energy. In this system, the tar generated during the gasification process interferes with plant operation.

[0003] Patent Document 1 describes a biomass gas generator that includes a process for injecting water into the generated gas. However, in the device described in this document, the temperature of the generated gas is about 300°C, so tar does not vaporize. Therefore, there is no suggestion of condensing and recovering the vaporized tar at a high temperature range of 650°C to 750°C.

[0004] Non-Patent Document 1 describes a system in which biomass such as grass clippings generated from expressways, pruned tree branches, and thinned wood is chipped and heated in a pyrolysis furnace.

[0005] Non-Patent Document 2 provides a more detailed description of the technical matters, although it covers the same subject matter as Non-Patent Document 1. Non-Patent Document 2 contains the following description of a system called "A new green recycling system using biomass gas power generation," as shown in Figure 7. "The biomass gas power generation system works by drying chipped biomass in a dryer, then heating and roasting it in a pyrolysis furnace to break it down into pyrolysis gas and charcoal. The tar and fine soot contained in the pyrolysis gas are purified by spraying circulating clean water on it. The final purified pyrolysis gas is sent to a generator, where it is mixed with auxiliary fuel (heavy oil A) to generate electricity. The generator has a rated output of 100 kilowatts, with 50 kilowatts for self-consumption within the plant and 50 kilowatts for transmission to the SA. The generated electricity is used for toilets, parking lot lighting, and other purposes in the SA. In addition to being used as fuel for power generation, the gas generated in the process is also circulated as heating energy for biomass. The weight of charcoal other than gas is reduced to one-tenth of the weight of plant-derived material. The exhaust heat from the generator is also used to dry the biomass, improving energy efficiency. Because the biomass is gasified by roasting it externally, no harmful substances such as dioxins are produced."

[0006] In the systems described in Non-Patent Documents 1 and 2, as described in the document "gas is purified by spraying circulating cleaning water onto the tar and fine soot contained in the pyrolysis gas," circulating cleaning water is sprayed onto the tar and fine soot. However, there is no suggestion as to the temperature at which the circulating cleaning water is sprayed. In the systems described in Non-Patent Documents 1 and 2, the tar could not be removed, and the tar interfered with plant operation, causing the plant to shut down after one day of operation and making it impossible to operate continuously for more than a few days. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2014-125577 [Non-patent literature]

[0008] [Non-Patent Document 1] East Nippon Expressway Company, "Practical supply of electricity from biomass gas power generation"<URL:https: / / www.e-nexco.co.jp / effort / technique / tinet / example / biomass_gas / > March 10, 2020 [Non-patent document 2] Nikkan Kensetsu Kogyo Shimbun, "East Nippon Expressway Company / Considerations for expansion of biomass power generation facilities / Practical application at Nasu Kogen SA on the Tohoku Expressway, August 8, 2016, Page 4"<URL:https: / / www.decn.co.jp / ?p=74521> March 10, 2020 Summary of the Invention [Problem to be solved by the invention]

[0009] The objective of the present invention is to obtain a system that heats and gasifies woody biomass in a pyrolysis furnace to generate electricity.

[0010] To provide a system for generating electricity by heating and gasifying woody biomass in a pyrolysis furnace, which can operate continuously without causing any trouble to the plant due to tar components being sufficiently removed.

[0011] This is a system that generates electricity by heating and gasifying wood biomass in a pyrolysis furnace, and the energy required by the system is the energy obtained as a result of operating the system. The object of the present invention is to obtain a system that can use the above. [Means for solving the problem]

[0012] (1) The problem is solved by a biomass power generation system that includes a woody biomass drying means for drying woody biomass, a pyrolysis means for heating the dried woody biomass and discharging pyrolysis gas, a tar component removal means for removing tar components from the pyrolysis gas shortly after it is discharged from the pyrolysis furnace, and a power generation means for generating electricity using the pyrolysis gas from which the tar components have been removed. The woody biomass targeted by this invention includes all resources derived from wood. It includes all parts of plants, including roots, leaves, stems, and flowers, regardless of whether they are broad-leaved or coniferous. It also includes plants in forests and urban areas. It also includes parts of wooden houses, such as pillars, walls, and ceilings. For example, it also includes waste materials from collapsed houses, which are generated in large quantities during disasters. Drying is carried out using existing methods, such as placing woody biomass in a silo and exposing it to hot air for a certain period of time. When woody biomass is put into a silo, it is crushed to a size of up to several tens of centimeters. The reason for crushing is to prevent woody biomass from becoming entangled with each other and blocking the entrance or exit of the silo, thereby hindering transportation. Since the purpose of crushing is to prevent this, it is not necessary to make the biomass into uniform sizes. Furthermore, it is not necessary to make pellets of uniform size and moisture content. Making pellets of uniform size and moisture content can reduce the generation of tar, but pelletizing requires cost and labor. The present invention is characterized by providing a means for thoroughly removing tar components without incurring such cost and labor. Here, the tar component refers to a component that is a raw material for tar. The pyrolysis method is an existing method in which woody biomass is fed into a kiln and heated externally at a high temperature of around 900°C to 1050°C. The pyrolysis gas immediately discharged from the pyrolysis furnace is at a very high temperature. When heated at a high temperature of around 900°C to 1050°C, the pyrolysis gas immediately discharged from the pyrolysis furnace is usually at a temperature of around 650°C to 780°C. In power generation systems using woody biomass, the treatment of tar generated from the woody biomass is an issue, but by providing a tar component removal means that removes tar components at such high temperatures, the tar can be effectively removed.

[0013] (2) The problem is solved by the biomass power generation system described in (1), characterized in that the pyrolysis furnace is heated by using the pyrolysis gas discharged from the woody biomass in the pyrolysis furnace. The reason why the pyrolysis gas from which the tar components have been removed by the tar component removing means can be used to heat the pyrolysis furnace is that, since the tar components have been removed, the use of the pyrolysis gas does not cause any problems for the plant. In this way, using the gas produced by the biomass power generation system to heat the pyrolysis furnace produces favorable results from the standpoint of cost and from the standpoint of not wasting energy resources on Earth.

[0014] (3) The problem is solved by the biomass power generation system described in (2), which is characterized by being equipped with an auxiliary fuel means for supplementing the energy supply when the pyrolysis gas discharged from the pyrolysis furnace after heating the woody biomass in the pyrolysis furnace is insufficient to heat the pyrolysis furnace. The pyrolysis means is set to maintain an appropriate temperature when discharging pyrolysis gas, in order to minimize the generation of tar components in the pyrolysis gas and to effectively generate gas, and heating is controlled to maintain the set temperature. Therefore, if using gasified woody biomass is insufficient to maintain the set temperature, it becomes necessary to use auxiliary fuel means. Existing fuels such as heavy oil A are used as auxiliary fuel means. Also used as auxiliary fuel means are char, sludge, tar collected by dust collectors, scrubbers, etc., and oil collected from food waste oil.

[0015] (4) The problem is solved by a biomass power generation system described in any one of (1) to (3), which is characterized by having an auxiliary fuel means that assists in the supply of energy for power generation when the set amount of power generation cannot be generated by driving the engine with the pyrolysis gas discharged from the woody biomass heated in a pyrolysis furnace. The electricity to be obtained as a result of biomass power generation is used by the biomass power generation system itself or externally, so the amount of electricity to be obtained is set in advance and controlled to obtain that amount of electricity. Therefore, if the amount of electricity generated by driving the engine with pyrolysis gas from which the tar components have been removed is not enough, it becomes necessary to use an auxiliary fuel means. Existing fuels such as heavy oil A are used as auxiliary fuel means. Also used as auxiliary fuel means are char, sludge, tar collected by dust collectors, scrubbers, etc., and oil collected from waste food oil.

[0016] (5) The biomass power generation system according to any one of (1) to (4), further comprising a char collection means for separating and collecting char from the pyrolysis gas. This solves the problem. The char can be separated and collected to obtain useful char.

[0017] (6) The problem is solved by a biomass power generation system described in any one of (1) to (5), characterized in that the tar component removal means is equipped with a water scrubber that removes hydrophilic tar components by spraying water onto the pyrolysis gas. By adopting a hydrophilic method for removing tar components, more effective tar removal can be achieved. When the produced gas is at a high temperature, the tar is gasified, and spraying water on it causes a rapid drop in temperature. As a result, the gasified tar is condensed and can be recovered as a liquid.

[0018] (7) A water recycling means for recycling the water used in the water scrubber, comprising a settled sludge removal mechanism for removing settled sludge, and a sludge filtering mechanism for filtering and removing sludge contained in the water used in the water scrubber, The problem is solved by the biomass power generation system described in (6), which is characterized by having a water circulation utilization means in which the water injection holes have a maximum particle diameter of more than 3.2 mm so that sludge remaining in the water does not clog. In order to operate a biomass power generation system continuously, it is desirable to be able to recycle the water used in the water scrubber. The settling sludge removal mechanism and sludge filtration mechanism function to remove the sludge removed from the generated gas by the water scrubber. It is possible to remove all remaining sludge from the water scrubber by using a finer filtration mechanism. However, considering the intended use of the water used in the water scrubber, it is not necessary to remove all remaining sludge. In other words, the purpose of the water used in the water scrubber is to spray it onto the high-temperature generated gas shortly after it is discharged from the pyrolysis chamber to wash away the tar components in the generated gas, so there is no need to completely remove the sludge. Rather, it is more cost-effective and labor-intensive to choose to simplify the system by clogging the system after removing a certain amount of sludge and not remove the remaining sludge. However, in this case, it is necessary to avoid clogging the water scrubber due to the remaining sludge. Therefore, to prevent clogging with sludge remaining in the water, the water injection holes are designed to have a maximum particle diameter of 3.2 mm or more.

[0019] (8) The problem is solved by a biomass power generation system described in any one of (1) to (7), characterized in that the tar component removal means is equipped with an oil scrubber that removes lipophilic tar components by spraying oil onto the pyrolysis gas. By adopting a means for removing lipophilic tar components, tar can be removed more effectively.

[0020] (9) The problem is solved by a biomass power generation system according to any one of (1) to (8), characterized in that the electricity obtained by the power generation means is used to operate the biomass power generation system. By using the electric power obtained by the power generation means for the means constituting the power generation system of the present invention, favorable results are produced from the viewpoint of cost and from the viewpoint of not wasting the earth's energy resources.

[0021] (10) A biomass power generation system according to any one of (1) to (9), characterized in that waste oil from a kitchen is used in the pyrolysis means or the tar component removal means. For example, if woody biomass is stored adjacent to a facility where waste kitchen oil and the like is constantly generated, such as a highway service area, the kitchen oil and the like that is used and discarded can be effectively used as energy to operate pyrolysis means and tar component removal means. [Effects of the Invention]

[0022] It is possible to obtain a system that heats and gasifies woody biomass in a pyrolysis furnace to generate electricity. In addition, in such a system, tar is sufficiently removed so that the plant is not affected by tar and the system can be operated continuously. In addition, in such a system, the energy obtained as a result of operating the system can be used as the energy required for the system. [Brief explanation of the drawings]

[0023] [Figure 1] 1 shows the flow of the plant in Example 1. [Figure 2] The flow of energy is added to the flow of Example 1. [Figure 3] 1 shows the water scrubber of Example 1. [Figure 4] The flow rate of pyrolysis gas and the like are shown in comparison between the plant of Example 1 and the old plant. [Figure 5] The amount of power generated and other data are shown by comparing the plant of Example 1 with the old plant. [Figure 6] The amount of electricity generated and its use in the plant of Example 1 are shown below. [Figure 7] This shows the flow of conventional biomass gas power generation. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0024] The configuration of the plant in Example 1 will be described with reference to FIG. 1. A raw material storage yard 10 is located near a service area on a highway. Materials such as grass, leaves, stems, and roots generated during maintenance of plants on the highway's median strip and roadside walls are stored in the raw material storage yard 10 as biomass raw materials (hereinafter referred to as "raw material"). The stored raw material is randomly crushed using a crusher to a maximum size of several tens of centimeters. The crushed raw material is then loaded into a raw material input hopper (not shown) at the plant entrance using a loader or similar device. The raw material loaded into the hopper is transported via a belt conveyor to a raw material silo 20. A mechanism may be provided to remove foreign matter, such as iron, that has become mixed into the raw material before it reaches the raw material silo 20 using a conventional means such as a magnet. Warm air at approximately 80°C to 100°C constantly flows through the raw material silo 20. The raw material is exposed to this warm air in the raw material silo 20 for several days. As a result, the raw material becomes dry and crumbly in the raw material silo 20.

[0025] The raw material is then transported via a belt conveyor to a weighing scale 30, where it is weighed and then fed into the rotary kiln 40 via the belt conveyor again. A mechanism may be provided to ensure that the raw material fed into the rotary kiln 40 is maintained at a constant, uninterrupted rate. The raw material fed into the rotary kiln 40 is maintained at a constant, uninterrupted rate. Fluctuations in the amount of biomass supplied to the pyrolysis furnace result in various fluctuations, such as fluctuations in the pyrolysis gas emitted by the pyrolysis furnace, fluctuations in the amount of heat required to heat the pyrolysis furnace, and fluctuations in the amount of auxiliary fuel supplied, making the system unstable. Therefore, a constant feeder is effective for achieving a stable system. Because the biomass to be gasified is relatively large, measuring up to several tens of centimeters, and of varying sizes, continuous, uninterrupted feeding of the biomass into the pyrolysis furnace is necessary for system stability. The biomass constant feeder may include a means for weighing the biomass immediately before feeding it into the pyrolysis furnace.

[0026] The rotary kiln 40 is externally heated by gas at approximately 950°C generated in the heated gas generator 100 (Figure 2). The raw materials are heated in the rotary kiln 40 in an oxygen-free environment, generating pyrolysis gas. The generated gas flows into the dry dust collector 50, maintaining its temperature (approximately 750°C) almost unchanged since generation. Two types of dry dust collectors 50 are used: a chamber dust collector (not shown) and a cyclone dust collector (not shown). In the chamber dust collector, relatively large char particles fall by gravity toward a conveyor (not shown). The generated gas then flows into the cyclone dust collector, maintaining its temperature, where relatively fine char particles are collected by centrifugal force and fall toward a conveyor (not shown). The char that falls from the chamber dust collector and cyclone dust collector toward the conveyor is transported by the conveyor and stored for later use as a product or fuel.

[0027] The generated gas continues to flow into the water scrubber 60 while maintaining approximately the same temperature as after generation, and a spray of water is sprayed on it. This removes hydrophilic tar components from the generated gas. By spraying a water shower on the gas while maintaining a high temperature in this way, many tar components are removed without clogging the gas path. Tar is generated in liquid or solid form as the gas temperature cools, but by removing it before it is generated, it is possible to significantly reduce the generation of tar when the gas cools down later.

[0028] The water used in the water scrubber 60 is circulated and reused as shown in Figure 3, thereby enabling continuous plant operation. The generated gas 45 flows into the water scrubber 60 while maintaining approximately the same temperature as when it was discharged from the rotary kiln 40, and is showered with water sprayed from the nozzles 68. Six nozzles are shown in the figure. Tar components in the generated gas 45 and fine char that was not completely removed by the dry dust collector 50 are washed away by the sprayed water and fall into the water seal tank 62. The tar components and fine char are called sludge. The tar components and fine char that accumulate in the water seal tank 62 are transported to the sludge collection tank 63 by the water seal conveyor 61. The sludge collected in the sludge collection tank 63 is periodically disposed of together with the sludge collected by the auto-strainer 65, which will be described later.

[0029] Next, the water from the water seal tank 62, from which most of the sludge has been removed, is sent to the auto-strainer 65 via the wash water circulation pump 64. The auto-strainer 65 is an existing filtering device equipped with a mesh, and filters out the tar components and fine char removed from the generated gas together with the water sprayed onto the generated gas 45 that did not settle in the water seal tank. Depending on the mesh, for example, tar components and char with a diameter of 1 μm or more may be filtered out.

[0030] The auto-strainer 65 is designed so that the sludge filtered through the mesh is periodically and automatically cleaned and removed. Two auto-strainers 65 are provided, and while one auto-strainer is cleaning its mesh, the other auto-strainer works to filter sludge from the generated gas. The sludge obtained by cleaning is transported to the sludge recovery tank 63 via a conveyor or the like (not shown).

[0031] The water then flows into the wash water cooler 66, where it is cooled by cooling water 67. As shown by arrow A in Figure 3, the water is again used in the water scrubber 60 as water to be sprayed onto the generated gas 45. At this time, sludge, for example, 1 μm or smaller, is not filtered out by the auto-strainer 65 and remains in the water, but is used as is as water for the water scrubber 60. For this reason, to prevent the injection holes from clogging with such sludge, the diameter of particles that can pass through the injection holes 68 is set sufficiently larger than the diameter of the sludge, for example, 3.2 mm. While the sludge remaining in the water is 1 μm, the diameter was set to 3.2 mm to take into account the possibility that multiple sludge particles may become entangled. Although a smaller injection hole is more convenient when spraying water powerfully, the injection holes are intentionally made large to use water with sludge remaining in it.

[0032] 3 and 1, the generated gas 45 that has passed through the water scrubber 60 then flows into the oil scrubber 70, where oil is sprayed onto the generated gas, thereby removing lipophilic tar components in the gas.

[0033] 1, the generated gas then flows into a submicron filter 80, where the submicron-sized tar components remaining in the gas are removed by the filter. Through this process, almost all of the raw materials that become tar in the gas are removed.

[0034] The gas is then forced by a blower into the cylinder of a generator 90, which drives the engine and generates electricity.

[0035] With reference to FIG. 2, the flow of the first embodiment will be explained with the addition of the flow of energy.

[0036] The gas, from which almost all tar components have been removed by passing through the submicron filter 80, is used as fuel in the heated gas generator (arrow j). The plant is also equipped with auxiliary fuel 130, such as heavy oil A, which is used as fuel for the heated gas generator 100, which provides the heat source for the rotary kiln, when the supply of biomass-derived energy (arrow j) is insufficient (arrow n).

[0037] The oil used to remove the lipophilic tar from the gas in the oil scrubber 70 is then used, still containing the tar, as fuel for the heated gas generator 100, which provides the heat source for the rotary kiln (arrow i).

[0038] Oil used in the kitchen 120 in the service area is stored in the waste oil tank 110 (arrow k) and used as fuel for the heated gas generator 100 (arrow l), which provides the heat source for the rotary kiln. The oil in the waste oil tank 110 is also used in the oil scrubber 70 to wash away lipophilic tar (arrow m). The auxiliary fuel 130 is also used as energy for generating electricity in the generator 90 (arrow o) when the supply of biomass-derived energy (arrow p) is insufficient.

[0039] The electricity obtained by power generation is used to operate the system, for example, to heat the hot air (arrow p) sent into the raw material silo 20. Furthermore, the electricity obtained by power generation is used (arrow q) in the service area (SA) 140. Although not shown, any surplus electricity obtained by power generation can also be sold.

[0040] Figure 4 shows the flow rate of pyrolysis gas in the plant of Example 1 and the old plant. The values ​​shown in the table in Figure 4 are average values ​​per hour on a certain day. The old plant is the plant shown in Non-Patent Documents 1 and 2. In other words, the old plant was not equipped with a means for removing tar components at high temperatures or an oil scrubber for removing lipophilic tar components, and tar was produced during plant operation, making it impossible to continue operating.

[0041] The "temperature of the gas used to heat the kiln" (Figure 4) is set to maintain a temperature of approximately 950°C. As mentioned above, gas from the heated gas generator 100 is used to heat the kiln 40 (arrow r in Figure 2). Furthermore, the energy used to generate heated gas in the heated gas generator 100 is primarily pyrolysis gas, from which almost all of the tar materials have been removed by passing through a submicron filter 80 (arrow j in Figure 2). When pyrolysis gas is insufficient as an energy source, auxiliary fuel 130 is used (arrow n in Figure 2).

[0042] "Pyrolysis gas" (Figure 4) is the gas produced by pyrolysis as a result of heating in the kiln. The "pyrolysis gas temperature" is set to approximately 750°C. In order to raise the "pyrolysis gas temperature," it is necessary to raise the temperature of the gas supplied to the kiln from the heating gas generator, so the means for raising the "pyrolysis gas temperature" are the same as those for raising the temperature of the heating gas generator. In other words, the pyrolysis gas is mainly used as the energy source for this (arrow j in Figure 2). If the pyrolysis gas is insufficient, auxiliary fuel 130 is used (arrow n in Figure 2).

[0043] As shown in Figure 2, the pyrolysis gas from which tar has been removed (referred to as "dry gas" in the table in Figure 4) is used as energy in two places: the generator 90 and the heated gas generator 100 (arrows h and j in Figure 2). Therefore, by measuring the "flow rate of dry gas supplied to the heated gas generator" and the "flow rate of dry gas supplied to the generator," the total amount of pyrolysis gas emitted from each plant can be determined to some extent.

[0044] In Figure 4, the "flow rate of dry gas supplied to the heating gas generator" and the "flow rate of dry gas supplied to the generator" are compared between the plant in Example 1 and the old plant, as shown below. In the plant of Example 1, adding the "flow rate of dry gas supplied to the heating gas generator" and the "flow rate of dry gas supplied to the generator" gives 19.8 + 32.7 = 52.5 (Nm 3 / h). On the other hand, in the old plant, adding the "flow rate of dry gas supplied to the heating gas generator" and the "flow rate of dry gas supplied to the generator" gives 0 + 20.0 = 20.0 (Nm 3 / h).

[0045] Figure 5 shows the "flow rate of dry gas to the generator," "amount of heavy oil A supplied to the generator," and "power generation amount" for the plant of Example 1 and the old plant. The values ​​shown in the table of Figure 5 are average values ​​per hour on the same date and time as those shown in Figure 4. Therefore, the old plant is the plant shown in Non-Patent Documents 1 and 2.

[0046] The "dry gas flow rate to the generator" was an average of 32.7 Nm3 in the plant of Example 1. 3 / h, while the old plant had an average of 20.0 Nm 3 / h. The "amount of heavy oil A supplied to the generator" was 5.2 L / h on average in the plant of Example 1, while it was 21.3 L / h on average in the old plant. The "amount of power generated" was 71.6 kW on average in the plant of Example 1, while it was 91.4 kW on average in the old plant.

[0047] Using the values ​​in Figure 5, the ratio of the amount of heat used in power generation from the supplied dry gas to that from the auxiliary fuel A heavy oil was calculated for each of the plant in Example 1 and the old plant, and the results are as follows.

[0048] where: Amount of heat given to gas = Flow rate (Nm 3 / h) × calorific value per unit of dry gas (MJ / Nm 3 ) Calorific value per unit of dry gas = 14.7 (MJ / Nm 3 ) Also here, Amount of heat obtained by oil = flow rate (L / h) x specific gravity (kg / L) x calorific value per unit of dry gas (MJ / kg) Specific gravity=0.85(kg / L) Calorific value per unit of dry gas = 38.9 (MJ / kg)

[0049] [Plant for Experimental Example 1] Dry gas 32.7 x 14.7 = 480.7 (MJ / h) Heavy oil 5.2×0.85×38.9=171.9(MJ / h) Dry gas:heavy oil = 480.7:171.9 = 1:0.36 [Old plant] Dry gas 20.0×14.7=294.0(MJ / h) Heavy oil 21.3×0.85×38.9=704.3(MJ / h) Dry gas:heavy oil = 294.0:704.3 = 1:2.40 That is, in the plant of Example 1, the calorific value used to obtain the set amount of electricity from dry gas was 1, while that from auxiliary fuel was 0.36. Also, in the old plant, the calorific value used to obtain the set amount of electricity from dry gas was 1, while that from auxiliary fuel was 2.40.

[0050] Figure 5 shows the amount of electricity generated and its use at the plant of Example 1. Of the average 71.6 kW of electricity generated that day, an average of 41.5 kW was used at the plant of Example 1 (arrow p in Figure 2, etc.). An average of 27.0 kW was transmitted to the service area (arrow q in Figure 2). [Explanation of symbols]

[0051] 10 Raw material storage yard 20 Raw material silo 30 Measuring instrument 40 Rotary Kiln 45 Evolved gas 50 Dry dust collector 60 Water Scrubber 61 Water-sealed conveyor 62 Water seal tank 63 Sludge 64 Cleaning water circulation pump 65 Auto Strainer 66 Washing water cooler 67 Cooling water 68 Injection hole 70 Oil Scrubber 80 Submicron Filter 90 Generator 100 Heating gas generator 110 Waste oil tank 120 Kitchen 130 Auxiliary fuel 140 SA (Service Area)

Claims

[Claim 1] a woody biomass drying means for drying the woody biomass; a pyrolysis means for heating the dried woody biomass and discharging pyrolysis gas; a tar component removing means for removing tar components from the pyrolysis gas shortly after being discharged from the pyrolysis means; and a power generation means for generating electricity using the pyrolysis gas from which the tar components have been removed.

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