JP2005009328A - Power generation method and pyrolytic volume reducing treatment facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise the thermal efficiency of a Stirling engine provided in a heating volume reduction treatment facility and to effectively utilize an electrical energy from a waste heat of the facility. <P>SOLUTION: A generator is driven by the Stirling engine 4 in which hot gas stream generated in the facility for heating volume reduction treatment of a raw material is made into a heating medium of a working fluid and a cooling medium served to a heat exchanger 3 provided to the facility is used as the cooling medium of the working fluid and an electrical power is obtained. As the hot gas stream, there is a combustion treated gas stream exhausted from a gas combustion furnace 2 in the facility. As the cooling medium, there is air or water introduced from outside of a system. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a Stirling equipped with a generator using exhaust heat generated in a large amount in a facility for heat reduction treatment of various raw materials (various organic substances, inorganic substances, sludge, soil, earth and sand, etc.) The present invention relates to a technique for generating electric power by driving an engine and recovering thermal energy as electric power.
[0002]
[Prior art]
Conventionally, when power is obtained from exhaust heat (heating gas, exhaust gas) generated in large quantities in facilities that heat and reduce various raw materials (various organic substances, inorganic substances, sludge, soil, earth and sand, etc.) In general, electric power is produced by driving a steam turbine with steam obtained from exhaust heat (thermal energy).
[0003]
By the way, in recent years, electric power production technology using a Stirling engine has been reviewed from the viewpoint of global environmental conservation. The Stirling engine obtains power by reciprocating the piston by fluctuations in the pressure of the working fluid due to external heating and cooling, and does not explode fuel like an internal combustion engine, so it is clean, safe and quiet. Known as a heat engine. Electric power production technology using Stirling engine is shown below.
[0004]
A battery charging power generator disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2002-39011) drives a Stirling engine with exhaust gas discharged from an aircraft auxiliary power unit (gas turbine) to generate power and store power.
[0005]
The carbonizing blast furnace method disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-163322) generates power using a Stirling engine that uses hot gas generated in various melting furnaces.
[0006]
The power generation device disclosed in Patent Document 3 (Japanese Patent Laid-Open No. 2000-310158) generates power using a Stirling engine that uses exhaust heat gas generated in a waste incinerator.
[0007]
Patent Document 4 (Japanese Patent Laid-Open No. 2000-45866) and Patent Document 5 (Japanese Patent Laid-Open No. 2000-45865) are exhaust heat recovery apparatuses using a Stirling engine that uses exhaust heat gas generated in an incinerator or an ash melting furnace. It is generating electricity.
[0008]
In Patent Document 6 (Japanese Patent Laid-Open No. 11-304123) and Patent Document 7 (Japanese Patent Laid-Open No. 11-264524), electric power is generated by a Stirling engine using exhaust heat gas generated in a gasification incinerator.
[0009]
In Patent Document 8 (Japanese Patent Laid-Open No. 8-94050), power is generated using a Stirling engine or the like using waste heat from a waste incinerator or an internal combustion engine.
[0010]
In Patent Document 9 (Japanese Patent Laid-Open No. 7-19008), power is generated by a Stirling engine using a high-temperature combustion gas obtained by burning dry distillation gas in an incinerator.
[0011]
[Patent Document 1]
JP 2002-39011 (paragraph number (0005) and FIG. 2)
[0012]
[Patent Document 2]
JP-A-2001-163322 (Claims 4 and 5)
[0013]
[Patent Document 3]
JP 2000-310158 (paragraph number (0021) and FIG. 1)
[0014]
[Patent Document 4]
JP 2000-45866 (paragraph number (0002))
[0015]
[Patent Document 5]
JP 2000-45865 (paragraph number (0016) and FIG. 1)
[0016]
[Patent Document 6]
JP-A-11-304123 (paragraph number (0010) and FIG. 1)
[0017]
[Patent Document 7]
JP-A-11-264524 (paragraph number (0006) and FIG. 1)
[0018]
[Patent Document 8]
JP-A-8-94050 (paragraph number (0009) and FIG. 1)
[0019]
[Patent Document 9]
JP 7-19008 (paragraph number (0007) and FIG. 1)
[0020]
[Problems to be solved by the invention]
A Stirling engine obtains power by repeated expansion by heating of the working fluid filled in the cylinder and contraction by heat dissipation, and the heating and expansion of the working fluid is exhaust heat (exhaust heat as shown in the previous patent document). However, there is a problem of how efficiently the working fluid is contracted by heat radiation.
[0021]
That is, the gas temperature in the heating part of the Stirling engine tends to be lower than the temperature of the high temperature heat source, and the gas temperature in the cooling part tends to be higher than the temperature of the low temperature heat source. Therefore, the working fluid in the Stalin engine has a smaller temperature difference, which can reduce the thermal efficiency of the engine.
[0022]
The present invention has been made in view of such circumstances, and its purpose is to increase the thermal efficiency of the Stirling engine provided in the heat reduction processing facility and to efficiently recover and use electrical energy from the exhaust heat of the facility, and It is in the provision of thermal decomposition weight reduction treatment facilities.
[0023]
[Means for Solving the Problems]
In facilities that heat and reduce various raw materials (organic substances, inorganic substances, sludge, soil, earth and sand, etc.), a large amount of exhaust heat is generated, so this exhaust heat can be used as a heat source. The pyrolysis gas generated in the facility is burned at 800 ° C. or higher, and the exhaust gas needs to be rapidly cooled to 300 ° C. or lower when discharged outside the system. This is to prevent dioxins decomposed by combustion from being re-synthesized in the exhaust gas. For this purpose, a heat exchanger is provided in the exhaust gas system to rapidly cool the exhaust gas.
[0024]
The power generation method and pyrolysis reduction treatment facility of the present invention pay attention to the exhaust heat gas from the heat reduction treatment facility and the cooling medium introduced into the heat exchanger that cools the exhaust heat gas and the circulating exhaust heat gas and cooling medium. By using it as a heating medium and a cooling medium for the working fluid in the Stirling engine, a sufficient temperature difference of the working fluid is secured, and the thermal efficiency of the engine is increased.
[0025]
That is, in the power generation method of the present invention, the hot gas flow generated in the facility for heat-reducing the raw material is used as the working fluid heating medium, and the cooling medium provided in the heat exchanger provided in the facility is used as the working fluid. The generator is driven by a Stirling engine as a cooling medium to obtain electric power.
[0026]
In addition, the thermal decomposition and reduction treatment facility of the present invention cools the hot gas generated in the gas combustion furnace for burning the cracked gas generated by heating and reducing the thermal decomposition of the raw material. The working fluid is cooled by a heat exchanger, a duct that supplies the hot gas to the heat exchanger, a heating unit that heats the working fluid by the gas flowing through the duct, and a cooling medium provided to the heat exchanger. And a Stirling engine having a cooling section.
[0027]
The power generation method and the thermal decomposition and reduction treatment facility of the present invention utilize the exhaust heat gas flow generated in the facility for heat reduction and treatment of various raw materials as a heating medium for the working fluid of the Stirling engine and heat exchange the gas flow. By using the cooling medium supplied to the heat exchanger as the cooling medium for the working fluid of the engine, a sufficient temperature difference between the working fluids can be secured, so that the thermal efficiency of the engine can be improved. Moreover, since the cooling medium introduced into the heat exchanger that rapidly cools the exhaust heat gas is used as the cooling medium for the working fluid, the power generation system is simplified. As described above, according to the power generation method and the thermal decomposition and reduction treatment facility of the present invention, the power generation efficiency is improved, and electric energy can be effectively recovered and utilized in the thermal decomposition and reduction treatment facility. As the exhaust heat gas flow, there is a combustion treatment gas flow discharged from a gas combustion furnace that burns a gas generated by the thermal decomposition and reduction process in the facility. The cooling medium is air or water. Examples of the air include air introduced to cool the exhaust gas, ventilation for facility ventilation, and deodorization.
[0028]
Examples of the thermal decomposition and reduction treatment facility include an incineration facility, a drying facility, a carbonization facility, an ashing facility, etc., and the present invention particularly relates to gas combustion for treating exhaust gas generated in the facility at 800 ° C. or more. It is suitable for a furnace provided with a furnace and cooling means for cooling the exhaust gas with a cooling medium of air or water.
[0029]
In the thermal decomposition and reduction treatment facility, a heating duct of a Stirling engine is provided in a duct for supplying the hot gas to a heat exchanger, and a bypass duct for bypassing the gas introduced into the duct is provided. A valve for changing the gas supply destination to the bypass duct side may be provided on the upstream side of the heating unit. At this time, when the temperature of the hot gas is equal to or higher than a certain value, the valve changes the supply destination of the hot gas to the heating unit side so that the heating gas of the Stirling engine is heated to a constant temperature. Since it can supply, in addition to the said effect, stable electric power generation can be performed.
[0030]
Furthermore, in the thermal decomposition and weight reduction treatment facility, a hot air furnace that generates hot air gas used for thermal decomposition and reduction of the raw material, and a gas that is heated by heat exchange in the heat exchanger are supplied to the hot air furnace. By providing a Stirling engine having a heating unit that heats the working fluid with the gas flowing through the duct, further recovery of electric energy can be achieved. Also in this case, a heating section of the Stirling engine is provided in the duct for supplying the gas heated and exchanged by the heat exchanger to the hot stove, and a path for bypassing the gas introduced into the duct is provided. It is preferable to provide a valve for changing the gas supply destination to the bypass duct on the upstream side of the heating unit. At this time, similarly to the above, when the temperature of the hot gas is equal to or higher than a certain value, the valve can change the supply destination of the hot gas to the heating unit side to perform stable power generation.
[0031]
In addition, when the cooling part of the Stirling engine is provided in the duct that supplies the cooling medium to the heat exchanger, the temperature difference of the working fluid can be further ensured in the Stirling engine, and the thermal efficiency of the engine is further improved. At this time, it is better to provide a heat transfer member in the heating part and the cooling part.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0033]
FIG. 1 is a schematic diagram showing an example embodiment of the thermal decomposition and reduction treatment facility of the present invention.
[0034]
In the thermal decomposition and weight reduction treatment facility of the present embodiment, power is obtained by driving the Stirling engine using the thermal energy of the exhaust gas generated in the facility where the raw material is subjected to thermal decomposition treatment and reduction treatment. A generator is driven to produce electricity. This electric power is directly stored, converted, converted, or quality-adjusted, and then used as a power source for various electrical devices in the facility, or purchased as electric power for other facilities or commercial power.
[0035]
A heat treatment apparatus 1 shown in FIG. 1 is an apparatus for thermally decomposing raw materials such as various organic substances, inorganic substances, sludge, soil, and earth and sand to obtain carbides. And a hot stove 15.
[0036]
The drying furnace 11 is a device that indirectly heats a raw material under a certain residence time and performs a drying process, and employs a rotary kiln system. That is, in the drying furnace 11, an external heating means (heating jacket 111) for heating the rotary furnace 110 from the outside by circulating hot air gas around the rotary furnace 110 is attached to the rotary furnace 110 into which the raw material is introduced. . The hot air gas is introduced from a hot air furnace 15 described later.
[0037]
The rotary furnace 110 has a cylindrical shape, is supported by a plurality of support rollers (not shown), and is rotated by a rotating means (not shown). At this time, a plurality of feed blades for stirring and conveying the introduced raw material may be provided inside the rotary furnace 110. In the present embodiment, the rotary furnace 110 is provided with a duct 10 for carrying the raw material to one end side thereof, and the raw material in the rotary furnace 110 is provided to the next step (carbonization furnace 13) on the other end side. A duct 12 to be transferred is provided. The duct 10 is appropriately provided with raw material charging means 101 such as a hopper facility.
[0038]
The carbonization furnace 13 is an apparatus that obtains carbides by indirectly heating the raw material dried in the drying furnace 11 under a certain residence time to obtain a carbide, adopting a rotary kiln system, and drying furnace 11. The configuration is the same as that. That is, the heating jacket 131 is attached to the rotary furnace 130 that introduces the dried raw material, and that is stirred and conveyed. A duct 14 for recovering carbides is connected to the rotary furnace 130 in the carbonization furnace 13.
[0039]
The drying furnace 11 and the carbonization furnace 13 are arranged so that the supply port of the carbonization furnace 13 communicates with the discharge port of the drying furnace 11 as illustrated. At this time, the discharge port of the drying furnace 11 and the supply port of the carbonization furnace 13 are provided with a duct 12 that covers and communicates with the discharge port and the supply port. The duct 12 is connected to piping for transferring gas (water vapor and pyrolysis gas) generated in the drying furnace 11 and the carbonization furnace 13 to the gas combustion furnace 2.
[0040]
The hot air furnace 15 is a device that supplies hot air gas, and includes a combustion burner for generating hot air gas. The hot air gas is supplied to the heating jacket 131 of the carbonization furnace 13 by the blower 16 to heat the rotary furnace 130 and then supplied into the heating jacket 111 of the drying furnace 11 to heat the rotary furnace 110. At this time, temperature adjusting air is appropriately injected into the hot air gas, and the gas temperature is adjusted. The hot air gas discharged from the heating jacket 111 is exhausted. A part of the gas is used by the blower 17 as ejector driving gas in the gas combustion furnace 2 or reused as hot air gas supplied to the heating jackets 111 and 131.
[0041]
The gas combustion furnace 2 uses the steam and pyrolysis gas introduced from the heat treatment apparatus 1 under a constant atmosphere and residence time (for example, an atmosphere of 800 ° C. or higher, more specifically, an atmosphere of about 850 ° C., for example). 2 minutes or more)) Combustion and detoxification treatment. At this time, air is appropriately introduced into the gas to be treated from outside the system to assist combustion. The gas combustion furnace 2 includes a gas combustion chamber to which a gas to be treated is supplied, and is provided with a combustion burner. Combustion by the combustion burner is appropriately controlled by adjusting the amount of fuel supplied. The gas burned in the gas combustion furnace 2 is supplied to the heat exchanger 3 through the duct 21.
[0042]
The heat exchanger 3 cools the gas to about 200 to 150 ° C. by a gas-gas or liquid-gas heat exchange method using air or water as a cooling medium. The cooling medium is introduced through the duct 301. At this time, fresh air that does not contain at least a sulfur component is appropriately supplied to the gas to be cooled, and the gas temperature is adjusted appropriately.
[0043]
The Stirling engine 4 obtains power by using the combustion processing gas discharged from the gas combustion furnace 2 as a heating medium for the working fluid, and drives a generator (not shown). At this time, the cooling medium for the working fluid uses air or water introduced from outside the system.
[0044]
FIG. 2 shows a specific installation example of the Stirling engine. The illustrated Stirling engine 4 employs a displacer type and includes a displacer unit 40 and a power unit 41.
[0045]
The displacer unit 40 includes a displacer piston 400 in a cylinder filled with a working fluid, and communicates with a drive shaft 42 including a piston shaft, a connecting rod, and a crankshaft. The drive shaft 42 includes a flywheel 43 and is connected to a generator 44. The working fluid may be a commonly used one. For example, any of air, helium gas, and nitrogen gas can be used. The displacer unit 400 includes a heating unit 401 that heats the working fluid and a cooling unit 402 that cools the fluid.
[0046]
The heating unit 401 is provided in the duct 21 and heats the working fluid in the displacer unit 40 with gas (combustion processing gas discharged from the gas combustion furnace 2) flowing through the duct 21. Further, it is more preferable that a heating auxiliary means 402 is attached to the connecting portion between the heating unit 401 and the duct 21. Examples of the heating auxiliary means 402 include a gas jacket in which hot air gas is circulated and a heat storage layer mainly composed of ceramics. The hot air gas may be introduced from the hot air furnace 15. In addition, in the heating part 401, as shown in FIG. 3, it is good to provide the heat-transfer member 405 and to improve a heating effect. It goes without saying that the heat transfer member 405 is provided so as not to hinder the inflow of gas.
[0047]
The cooling unit 403 is provided in a duct 300 through which a cooling medium to be supplied to the heat exchanger 3 flows, and heats the working fluid in the displacer unit 40 by the cooling medium. Examples of the cooling medium include fresh air and water. At this time, a heat transfer member may be attached to the cooling unit 403 to enhance the cooling effect. An example of the heat transfer member is a cooling fin.
[0048]
The power unit 41 includes a power piston 410 that operates according to a change in pressure of the working fluid. And it connects with the drive shaft 42 via a connecting rod and a crankshaft. The power unit 41 is provided in the duct 300.
[0049]
Further, as shown in FIG. 2, the duct 21 is provided with a bypass duct 22 for supplying the combustion processing gas directly to the heat exchanger 3 without supplying it to the heating unit 401 of the Stirling engine 4. Yes. At this time, a valve V <b> 1 that can change the gas supply destination to either the heating unit 401 or the bypass duct 22 is provided on the upstream side of the heating unit 401.
[0050]
An operation example of the processing facility of this embodiment will be described.
[0051]
When the raw material is a solid, the raw material is pulverized to an average particle size of 10 to 20 mm or less and then supplied to the heat treatment apparatus 1. Here, when the raw material is sludge, it is not necessary to grind, but it may be crushed as necessary. Further, when the raw material is a material having a low water content, for example, a polymer material such as rubber scrap or plastic, the drying treatment and carbonization treatment may be performed in a single rotary kiln. Further, when the raw material is an organic material having a high water content, such as sewage sludge, the drying process may be performed in a plurality of rotary kiln furnaces.
[0052]
In the drying furnace 11 illustrated in FIG. 1, the raw material is dried under an atmosphere of, for example, about 150 to 400 ° C. and a certain residence time (for example, about 30 minutes). At this time, water contained in the raw material is released as water vapor. The steam is used for the combustion treatment in the gas combustion furnace 2. Next, in the carbonization furnace 13, the raw material is subjected to dry distillation treatment under a temperature of, for example, about 350 to 650 ° C., so that the amount of carbide is reduced. At this time, the organic component in the raw material is decomposed and deposited. In addition, the other decomposition precipitation components are subjected to a combustion treatment in the gas combustion furnace 2, and under a constant atmosphere and a residence time (for example, a residence time of 2 seconds or more in an atmosphere of about 800 ° C. or higher). The combustion process.
[0053]
The gas burned in the gas combustion furnace 2 is sucked and introduced into the heat exchanger 3 and the bag filter 31 through the path 21 by the blower 32.
[0054]
Here, when the Stirling engine 4 is not used, or when the temperature of the combustion processing gas is not equal to or higher than a certain value, for example, when the gas combustion furnace 2 starts up or stops, the valve V1 is set to be closed and the combustion is performed. The processing gas is supplied to the heat exchanger 3 through the bypass duct 22.
[0055]
Further, when the Stirling engine 4 is used or when the temperature of the combustion processing gas is equal to or higher than a certain value, the valve V1 is set to open and the combustion processing gas is supplied to the heat exchanger 3 through the duct 21. At this time, the working fluid in the heating unit 401 of the Stirling engine 4 provided in the path 21 is heated by the gas flowing in the path 21, and the working fluid in the cooling unit 403 and the power unit 41 of the engine is routed. It is cooled by a cooling medium that circulates in 300 (FIG. 2). The power obtained by the Stirling engine 4 that heats and cools the working fluid is supplied to the generator 44 via the drive shaft 42 and the flywheel 43. The electric power obtained by the power generator 44 is stored in the power storage 45 and then appropriately converted or converted before being supplied to various electric devices or purchased.
[0056]
The combustion processing gas cooled by the heat exchanger 3 is introduced into the bag filter 31 and subjected to dust removal processing, and then released from the chimney 33 to the atmosphere. Although the cooling medium of the heat exchanger 3 is introduced from outside the system through the path 301, the cooling medium provided to the Stirling engine 4 may be used in combination as shown in FIG. Further, as the cooling medium of the heat exchanger 3, the cooling medium provided to the Stirling engine 4 may be used as it is, as in the embodiment shown in FIG. Air heated by heat exchange in the heat exchanger 3 is supplied to the hot stove 15 and the heating jackets 111 and 131 through the duct 302 and used as hot air. As a result, the fuel for generating hot air can be reduced.
[0057]
The Stirling engine may be provided in a duct 302 that transfers air heated by heat exchange by the heat exchanger 3 to the hot stove 15 like the Stirling engine 5 in the embodiment shown in FIG. At this time, the Stirling engine 5 is provided such that the heating unit in the depressor unit is disposed in the duct 302. Also in this embodiment, for the same purpose as the embodiment shown in FIG. 2, the duct 302 is provided with a bypass duct 303 for supplying the gas supply directly to the hot stove 15 and the gas supply destination of the Stirling engine. A valve V2 to be changed is provided on the heating unit or bypass duct 303 side. The power obtained by the Stirling engine 5 is supplied to a generator (not shown). The electric power obtained by this generator is also stored and then converted or converted as appropriate before being supplied to various electric devices or purchased.
[0058]
【The invention's effect】
As is clear from the above description, according to the power generation method and the thermal decomposition and reduction treatment facility of the present invention, the exhaust heat gas flow generated in the facility for reducing and heating various raw materials is used to heat the working fluid of the Stirling engine. The use of a cooling medium used as a medium and a heat exchanger for exchanging heat of the gas flow as a cooling medium for the working fluid of the engine ensures a sufficient temperature difference of the working fluid, and the thermal efficiency of the engine Can be improved. Therefore, electric energy can be efficiently recovered and used from the exhaust heat of the thermal decomposition and reduction treatment facility.
[0059]
Moreover, since the cooling medium introduced into the heat exchanger that rapidly cools the exhaust heat gas is used as the cooling medium for the working fluid, the power generation system is simplified.
[0060]
Furthermore, when the hot gas obtained by heat exchange is returned to the hot stove installed in the thermal decomposition and reduction treatment facility, this hot gas is used as a heating medium for the working fluid of the Stirling engine, thereby further increasing the electric energy. Recovery is possible.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an embodiment of a thermal decomposition and reduction treatment facility according to the present invention.
FIG. 2 is a schematic diagram showing an example embodiment of a Stirling engine.
FIG. 3 is a schematic diagram illustrating an example embodiment of a Stirling engine.
FIG. 4 is a schematic diagram illustrating an example embodiment of a Stirling engine.
FIG. 5 is a schematic diagram illustrating an example embodiment of a Stirling engine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat processing apparatus, 11 ... Drying furnace, 13 ... Carbonization furnace, 15 ... Hot-blast furnace 2 ... Gas combustion furnace, 21 ... Duct, 22 ... Detour duct, V1 ... Valve 3 ... Heat exchanger, 300, 301, 302 ... Duct, 303 ... Detour duct, 31 ... Bag filter, 32 ... Blower, 33 ... Chimney, V2 ... Valve 4, 5 ... Stirling engine, 40 ... Displacer part, 400 ... Displacer piston, 401 ... Heating part, 402 ... Heating Auxiliary member, 403 ... Cooling unit, 404, 405 ... Heat transfer member, 41 ... Power unit, 410 ... Power piston, 42 ... Drive shaft, 43 ... Flywheel, 44 ... Generator, 45 ... Capacitor

Claims (11)

Electric power is generated by a Stirling engine in which a hot gas flow generated in a facility for heat-reducing the raw material is used as a working fluid heating medium and a cooling medium provided in the heat exchanger provided in the facility is used as a working fluid cooling medium. A power generation method characterized in that electric power is obtained by driving a machine. The power generation method according to claim 1, wherein the hot gas flow is a combustion treatment gas flow discharged from the facility. The power generation method according to claim 1, wherein the cooling medium is air or water. A gas combustion furnace that burns cracked gas generated by heating and reducing the thermal decomposition of raw materials;
A heat exchanger for cooling the hot gas generated in this gas combustion furnace;
A heating unit that heats the working fluid with a gas that flows through the duct, and a cooling unit that cools the working fluid with a cooling medium provided to the heat exchanger; A pyrolysis weight loss treatment facility characterized by comprising a Stirling engine. In the duct for supplying the hot gas to the heat exchanger, a heating part of the Stirling engine is provided and a bypass duct for bypassing the gas introduced into the duct is provided, and a gas supply destination is provided upstream of the heating part. The thermal decomposition weight reduction processing facility according to claim 4, further comprising a valve that can be changed to either the heating unit side or the bypass duct side. The valve changes the supply destination of the hot gas to the heating unit side when the temperature of the hot gas is a certain value or more, and supplies the hot gas when the temperature of the hot gas is less than a certain value. 6. The thermal decomposition and reduction facility according to claim 5, wherein the tip is changed to the bypass duct side. A hot stove for generating hot air gas to be used for thermal decomposition and weight reduction of the raw material;
And a Stirling engine having a heating unit that heats the working fluid by the gas that flows through the duct and is provided in a duct that supplies the gas heated and exchanged in the heat exchanger to the hot stove. The thermal decomposition weight loss treatment facility according to any one of claims 4 to 6, characterized in that In the duct for supplying the gas heated and exchanged by the heat exchanger to the hot stove, a heating part of a Stirling engine is provided and a bypass duct for bypassing the gas introduced into the duct is provided, 8. The thermal decomposition and reduction treatment facility according to claim 7, further comprising a valve that can change a gas supply destination to either the heating unit or the bypass duct on the upstream side of the heating unit. The valve changes the supply destination of the hot gas to the heating unit side when the temperature of the hot gas is a certain value or more, and supplies the hot gas when the temperature of the hot gas is less than a certain value. The thermal decomposition weight reduction facility according to claim 8, wherein the tip is changed to the bypass duct side. The thermal decomposition and reduction treatment facility according to any one of claims 4 to 9, wherein a cooling unit for the Stirling engine is provided in a duct for supplying a cooling medium to the heat exchanger. The thermal decomposition and reduction treatment facility according to any one of claims 4 to 10, wherein a heat transfer member is provided in the heating unit and the cooling unit.

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