JP3950580B2 - Waste treatment method and thermal decomposition apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a recyclable waste treatment production by treating unsorted or untreated solid or liquid household and special waste (hereinafter referred to as general waste) and industrial waste containing various pollutants. The present invention relates to a waste treatment method and a thermal decomposition apparatus used to obtain a product.
[0002]
[Prior art]
Conventionally, as a system for treating various types of waste such as general waste or industrial waste, for example, waste contaminated with harmful substances as described in Japanese Patent Publication No. 8-24904 is thermally applied. Systems for processing are known. This method employs a treatment process in which waste is pulverized with a shredder, pyrolyzed under high heat in a pyrolysis furnace, and then recovered in a gas reforming and gasification furnace to recover metals, glassy substances, etc. is doing. The secondary substance discharged from this treatment process is divided into two parts: a substance used as an energy source in the process and a substance discharged from the treatment process. In this processing method, a processing method and an apparatus capable of manufacturing and processing a recyclable substance with minimum energy have been proposed.
[0003]
In such a thermal decomposition waste treatment system, an externally heated rotary kiln that heats a rotary drum from the outside is generally used as a thermal decomposition furnace. An example of a pyrolysis furnace using this externally heated rotary kiln is shown in FIG. Waste is continuously supplied into the rotary drum 2 by the waste supply mechanism 1. The rotating drum 2 is supported at two points by a roller 3 and is rotated at a low speed by a rotation driving mechanism 4. The central portion of the rotating drum 2 is installed inside the combustion chamber 5, and the waste in the rotating drum 2 is heated to a high temperature by the combustion gas from the burner 6 attached to the combustion chamber 5. Further, the exhaust gas generated in the combustion chamber 5 is discharged outside the combustion chamber through the exhaust gas duct 7.
[0004]
The waste is thermally decomposed by being heated to a high temperature inside the rotary drum 2. At this time, pyrolysis gas and pyrolysis residue are generated. Thereafter, the two are separated by a hood 8 that communicates with the outlet of the rotating drum 2, one as gas and the other as solid. A rotary seal device 9 is provided at each of the connecting portions of the rotating portion and the stationary portion, and partitions the inside and the outside of the rotating drum 2. The inside of the rotary drum 2 is normally set to a pressure lower than the atmospheric pressure, and the two rotary seal devices 9 prevent the pyrolysis gas from flowing out.
[0005]
[Problems to be solved by the invention]
In the treatment process using the conventional gas reforming and melting gasification furnace described above, NH ₃ inevitably generated in the pyrolysis process reacts with the organic pyrolysis gas to produce highly toxic hydrogen cyanide. A specific method for preventing or removing hydrogen cyanide in this step is not disclosed.
[0006]
In addition, the thermal decomposition reaction in this treatment step needs to be performed in an atmosphere from which oxygen is completely removed, and the thermal decomposition furnace using the rotary kiln must be sufficiently shielded from air. This is because if the air is not sufficiently blocked, the oxygen contained in the air causes a local combustion reaction inside the rotary drum 2 and the thermal decomposition may be insufficient. For this reason, the rotary seal device 9 of the rotary drum 2 is required to have high performance, but it is difficult to completely seal the rotary drum 2 having a large diameter and a large amount of displacement due to thermal expansion. Is allowed.
[0007]
There are a wide variety of types of waste to be processed, the heating temperature is not uniform, and it is generally difficult to quantitatively set the upper limit of the allowable amount of leakage, which achieves the desired pyrolysis process It is a bottleneck to do.
[0008]
It is an object of the present invention to detoxify a product when waste containing various harmful substances is thermally decomposed, and further reduce the amount of air leak and the amount of air carried by the accompanying as much as possible. And providing a thermal decomposition apparatus.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the waste treatment method of the present invention comprises a step of crushing waste to obtain a treated material having a uniform size, and thermally decomposing the obtained treated material to produce pyrolysis gas and heat. A step of generating a decomposition residue, a step of reforming the obtained pyrolysis gas to a combustible gas, a step of gasifying and melting the obtained pyrolysis residue to generate a combustible gas and a molten slag, and In a waste treatment method comprising a step of purifying the generated flammable gas into a clean flammable gas, an organic halogen compound is added to the pyrolysis gas in the pyrolysis gas reforming step, and the reaction is performed simultaneously. To do.
[0010]
In the above waste treatment method, an organic halogen compound is added to the pyrolysis gas in the pyrolysis gas reforming step and reacted at the same time, whereby an ammonium halide halide and a radical are generated. As a result, NH ₃ is fixed as a salt, and it can be prevented that hydrogen cyanide is generated due to the progress of the reaction with other organic compounds. The radical generated by this reaction has a function of further promoting the reforming action.
[0011]
The organic halogen compound is preferably a chain hydrocarbon halogen substitution, a chain hydrocarbon fluorine substitution, an alkane fluorine substitution, a methane and ethane fluorine substitution, a chain hydrocarbon fluorine substitution and a chlorine substitution. , Fluorine and chlorine substitutes of alkanes, and chlorofluorocarbons.
[0012]
Also, chlorofluorocarbons, desirably, freon -11 (CCl ₃ F), CFC -12 (CCl ₂ F _2), Freon -21 (CHCl ₂ F), CFC -22 (CHClF _2), CFC -112 (C ₂ Cl ₄ F ₂ ), Freon-113 (C ₂ Cl ₃ F ₃ ), Freon-114 (C ₂ Cl ₂ F ₄ ), or Freon-115 (C ₂ ClF ₅ ).
[0013]
Furthermore, chlorofluorocarbons are used as refrigerants, preferably recovered fluorocarbons, otherwise used as propellants and recovered aerosols.
[0014]
In addition, the waste treatment method of the present invention includes a step of crushing waste to obtain a treated material having a uniform size, and pyrolyzing the obtained treated material to generate a pyrolysis gas and a pyrolysis residue. A step, a step of reforming the obtained pyrolysis gas to a combustible gas, a step of gasifying and melting the obtained pyrolysis residue to generate a combustible gas and a molten slag, and the obtained combustible gas In the waste treatment method comprising the step of purifying the product into a clean combustible gas, the urethane foam foamed with the organic halogen compound in the thermal decomposition step of the object to be treated is simultaneously decomposed.
[0015]
In the above waste treatment method, by simultaneously decomposing urethane foam foamed with an organic halogen compound in the thermal decomposition process of the object to be treated, an organic halogen compound gas is generated, and the pyrolysis gas and this gas are mixed. To do. In the next reforming step, NH ₃ reacts with the organic halogen compound to produce an ammonium halide anion salt and a radical. As a result, NH ₃ is fixed as a salt, and generation of hydrogen cyanide can be prevented.
[0016]
The urethane foam desirably uses urethane foam insulation material from various products as waste.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of the present invention will be described with reference to FIG. The waste treatment system to which the method of the present invention is applied comprises a pretreatment system 11, a pyrolysis furnace 12, a gas reformer 13, a gas purification device 14, and a gasification melting furnace 15. In the pretreatment process, waste is crushed into a uniform size suitable for treatment in the pretreatment system 11 and dried to remove moisture. In the pyrolysis step, the workpiece having a uniform shape through the pretreatment step in the pyrolysis furnace 12 is heated to 450 to 650 ° C. and decomposed into pyrolysis gas and pyrolysis residue. In the pyrolysis process by the pyrolysis furnace 12, the inflow of air is blocked in order to prevent combustion.
[0027]
Further, in the gas reforming step, the pyrolysis gas is reformed in the gas reformer 13 at a high temperature of 1000 ° C. or more into a combustible gas containing hydrogen, carbon monoxide, and hydrocarbons. The gas purification process in the gas purification device 14 is purified to a clean combustible gas by removing impurities contained in the combustible gas. Further, in the process for the pyrolysis residue, the pyrolysis residue is heated to 1300 ° C. or more in the gasification melting furnace 15 and decomposed into a combustible gas containing carbon monoxide and molten slag. The combustible gas generated here is purified into a clean combustible gas together with the combustible gas from the gas reforming device 13 in the gas purification process by the gas purification device.
[0028]
In the present embodiment, an organic halogen compound is mixed in a pyrolysis gas in a gas reforming process using the gas reformer 13 of the waste treatment system and reacted with NH ₃ . At this time, as the reaction proceeds, NH ₃ is fixed as an ammonium halide anion salt. As a result, it is possible to suppress the reaction of NH ₃ and hydrocarbons to generate hydrogen cyanide.
[0029]
(Second to eighth embodiments)
Second to eighth embodiments of the present invention will be described. Each embodiment uses the same waste treatment system as that in the first embodiment, and performs the same process, that is, a pretreatment process, a thermal decomposition process, a gas reforming process, a gas purification process, and a gasification melting process. Among the above steps, in the gas reforming step using the gas reformer 13, the following organic halogen compound is mixed in the pyrolysis gas and reacted with NH ₃ .
[0030]
Second embodiment-Halogen substitution product of chain hydrocarbon Third embodiment-Fluorine substitution product of chain hydrocarbon Fourth embodiment-Fluorine substitution product of alkane Fifth embodiment-Methane Fluorine substitution product of ethane and ethane-Fluorine and chlorine substitution product of chain hydrocarbons-Seventh embodiment-Fluorine and chlorine substitution product of alkane-Eighth embodiment-Chlorofluorocarbons 0031
As the reaction proceeds, NH ₃ is fixed as an ammonium halide anion salt, ammonium chloride or ammonium fluoride. Thereby, it becomes possible to suppress that NH ₃ reacts with hydrocarbons to generate hydrogen cyanide.
[0032]
(Ninth to 16th embodiments)
Ninth to sixteenth embodiments of the present invention will be described. Each embodiment uses the same waste treatment system as the first embodiment, and performs the same process, that is, a pretreatment process, a thermal decomposition process, a gas reforming process, a gas purification process, and a gasification and melting process. . Among the above steps, in the gas reforming step using the gas reformer, the next chlorofluorocarbon is mixed in the pyrolysis gas and reacted with NH ₃ .
[0033]
Ninth Embodiment-Flon-11 (CCl ₃ F)
Tenth Embodiment - Freon -12 (CCl ₂ F ₂₎
Eleventh embodiment-Flon-21 (CHCl ₂ F)
Twelfth embodiment-CFC-22 (CHClF ₂ )
Thirteenth Embodiment - Freon _{-112 (C 2 Cl 4 F 2} )
14th Embodiment - Freon _{-113 (C 2 Cl 3 F 3} )
Fifteenth embodiment-Freon-114 (C ₂ Cl ₂ F ₄ )
Sixteenth Embodiment-Flon-115 (C ₂ ClF ₅ )
[0034]
As the reaction proceeds, NH ₃ is fixed as ammonium chloride or ammonium fluoride. As a result, it is possible to suppress the reaction of NH ₃ and hydrocarbons to generate hydrogen cyanide.
[0035]
(Seventeenth and eighteenth embodiments)
Seventeenth and eighteenth embodiments of the present invention will be described. Each embodiment uses the same waste treatment system as the first embodiment, and performs the same process, that is, a pretreatment process, a thermal decomposition process, a gas reforming process, a gas purification process, and a gasification and melting process. . Among the above steps, in the gas reforming step using the gas reformer 13, the next chlorofluorocarbon is mixed in the pyrolysis gas and reacted with NH ₃ .
[0036]
Seventeenth embodiment-Freon used once as a refrigerant and then recovered 18th embodiment-Aerosol once used as a propellant in spray cans and then recovered
As the reaction proceeds, NH ₃ is fixed as an ammonium halide salt. Thus, reacting a hydrocarbon with NH _3, it is possible to suppress the hydrogen cyanide to produce.
[0038]
(Nineteenth and twentieth embodiments)
Nineteenth and twentieth embodiments of the present invention will be described with reference to FIGS. In FIG. 2, the waste treatment system to which the method of the present invention is applied is configured in the same manner as in the first embodiment. That is, it comprises a pretreatment system 11, a pyrolysis furnace 12, a gas reformer 13, a gas purification device 14, and a gasification melting furnace 15.
[0039]
In the nineteenth embodiment, urethane foam foamed with an organic halogen compound is simultaneously decomposed in a thermal decomposition step using the thermal decomposition furnace 12 of this waste treatment system.
[0040]
Further, as shown in FIG. 3, the twentieth embodiment is a urethane that is used as a heat insulating material for a product such as a refrigerator in a thermal decomposition process using a thermal decomposition furnace 12 of a waste treatment system, and then recovered. Disassemble foam insulation at the same time.
[0041]
As decomposition proceeds, an organic halogen compound gas is generated and mixed with the pyrolysis gas. This pyrolysis gas flows to the gas reformer 13, NH _{3 in} the gas reacts with the organic halogen compound, and is fixed as an ammonium halide anion salt. As a result, it is possible to suppress the reaction of NH ₃ and hydrocarbons to generate hydrogen cyanide.
[0042]
(Twenty-first embodiment)
A twenty-first embodiment of the present invention will be described with reference to FIG. The thermal decomposition apparatus is composed of an externally heated rotary kiln. The main configuration of this device is the same as described above. The exhaust gas duct 7 and the rotary seal device 9 are each connected by an exhaust gas system 16. Each exhaust gas system 16 is provided with an exhaust gas supply device 17. The exhaust gas supply device 17 extracts the exhaust gas flowing through the exhaust gas duct 7 and supplies it to the rotary seal device 9 while maintaining an appropriate temperature and pressure. In this figure, a simplified block diagram is shown, but a gas cooling device, a flow rate adjusting device, a pressure adjusting device, and a blower are provided.
[0043]
The present embodiment is configured as described above, and high-temperature exhaust gas flows in the exhaust gas duct 7 during operation. When the exhaust gas supply device 17 is started, the exhaust gas from the exhaust gas duct 7 flows into the exhaust gas supply device 17 and is cooled by the gas cooling device. The pressure of the exhaust gas is adjusted by a pressure adjusting device, and the exhaust gas is sent to the rotary sealing device 9 as a sealing gas by a blower. The sealing gas seals a minute gap between the rotating part and the stationary part. Thereby, ambient air can be prevented from flowing into the rotary drum 2 from the rotary seal device 9. Since the exhaust gas contains almost no oxygen, even if it flows into the rotating drum 2, it has no effect.
[0044]
Thus, in the present embodiment, it is possible to avoid the occurrence of local combustion due to an increase in the amount of oxygen in the rotary drum 2 due to air leakage.
[0045]
(Twenty-second embodiment)
A twenty-second embodiment of the present invention will be described with reference to FIG. The waste supply mechanism 1 includes two gate type valves 18 in the inlet duct. An exhaust gas system 19 connecting the other end to the exhaust gas duct 7 is connected to an inlet duct between the two gate type valves 18, and an exhaust gas supply device 20 is provided in this path. The exhaust gas supply device 20 includes a gas cooling device, a flow rate adjusting device, a pressure adjusting device, and a blower similar to those in the twenty-first embodiment.
[0046]
The present embodiment is configured as described above, and high-temperature exhaust gas flows through the exhaust gas duct 7 during operation. When the exhaust gas supply device 20 is started, the exhaust gas from the exhaust gas duct 7 flows into the exhaust gas supply device 20 and is cooled by the gas cooling device, and the pressure is adjusted by the pressure adjusting device. The exhaust gas is pressurized by a blower and blown out into the inlet duct of the waste supply mechanism 1. At this time, by closing the two gate type valves 18, the air is replaced with the exhaust gas around the workpiece in the inlet duct.
[0047]
Thereby, when a to-be-processed object is sent into the rotating drum 2, it can prevent that air is simultaneously conveyed with a to-be-processed object. The amount of oxygen contained in the exhaust gas is extremely small, and even if the exhaust gas is accompanied by the object to be processed and sent to the rotating drum 2, the amount of oxygen does not increase.
[0048]
Thus, in the present embodiment, the amount of air carried by the rotating drum 2 can be drastically reduced, and it is possible to almost eliminate the occurrence of local combustion in the rotating drum 2. .
[0049]
(Twenty-third embodiment)
A twenty-third embodiment of the present invention will be described with reference to FIG. This thermal decomposition apparatus includes a nitrogen gas supply device 21. This nitrogen gas supply device 21 is connected to an inlet duct between the two gate type valves 18 of the waste supply mechanism 1 by a gas system 22.
[0050]
This embodiment has the above-described configuration, and the two gate valves 18 are fully opened when the workpiece is introduced into the thermal decomposition apparatus. The workpiece enters the inlet duct when the valve 18 is opened. Thereafter, both valves 18 are fully closed. Thereafter, the nitrogen gas supply main valve (not shown) of the nitrogen gas supply device 21 is fully opened. At this time, the nitrogen gas maintained at a constant pressure is blown into the inlet duct, and the air around the workpiece is replaced by the nitrogen gas. Thus, when the object to be processed is fed into the rotating drum, it is possible to avoid that air is simultaneously conveyed along with the object to be processed.
[0051]
In this embodiment, water vapor may be used as a replacement gas instead of nitrogen gas. Further, an inert gas not containing oxygen or a mixed gas thereof may be used. In this case, the thermal decomposition apparatus includes a water vapor supply device and an inert gas supply device instead of the nitrogen gas supply device 21.
[0052]
Thus, in the present embodiment, the amount of air carried by the rotating drum 2 can be drastically reduced, and it is possible to almost eliminate the occurrence of local combustion in the rotating drum 2. .
[0053]
(24th Embodiment)
A twenty-fourth embodiment of the present invention will be described with reference to FIG. As in the twenty-third embodiment, this thermal decomposition apparatus includes a nitrogen gas supply device 21. This nitrogen gas supply device 21 is connected to an inlet duct between the two gate type valves 18 of the waste supply mechanism 1 by a gas system 22. In addition, it has a vacuum pump 23 in communication with the inlet duct between the two gated valves 18.
[0054]
This embodiment has the above-described configuration, and the two gate valves 18 are fully opened when the workpiece is introduced into the thermal decomposition apparatus. The workpiece enters the inlet duct when the valve 18 is opened. Thereafter, both valves 18 are fully closed. After the introduction of the object to be processed, the vacuum pump 23 is started to extract the air in the inlet duct. When the degree of vacuum increases, the operation of the vacuum pump 23 is stopped. Thereafter, the nitrogen gas supply source valve of the nitrogen gas supply device 21 is fully opened. At this time, the nitrogen gas maintained at a constant pressure is blown into the inlet duct, and the air around the workpiece is replaced by the nitrogen gas. Thus, when the object to be processed is fed into the rotating drum, it is possible to avoid that air is simultaneously conveyed along with the object to be processed.
[0055]
In this embodiment, instead of nitrogen gas, an inert gas not containing water vapor or oxygen or a mixed gas of inert gas may be used as a replacement gas. In this case, the thermal decomposition apparatus includes a water vapor supply device and an inert gas supply device in place of the nitrogen gas supply device 21.
[0056]
As described above, in the present embodiment, the amount of air carried by the rotating drum 2 can be made substantially zero, and local combustion can be eliminated in the rotating drum 2.
[0057]
(25th embodiment)
A twenty-fifth embodiment of the present invention will be described with reference to FIG. The thermal decomposition apparatus includes a monitoring device 24 that determines whether there is an abnormality based on the oxygen concentration in the rotating drum 2. The monitoring device 24 includes an oxygen concentration meter 25 that detects the oxygen concentration in the rotary drum 2 and an abnormality determination device 26 that determines whether the oxygen concentration is normal based on the detected oxygen concentration. The oxygen concentration meter 25 is composed of, for example, a zirconia oxygen analyzer that can be directly inserted into a high-temperature gas. A zirconia oxygen analyzer is one in which electrodes are attached to both sides of a zirconia element to detect the generation of electromotive force due to oxygen ion conduction, and an oxygen analyzer used for combustion control is used.
[0058]
The present embodiment is configured as described above. During operation, for example, when the amount of leaked air increases for some reason and the oxygen concentration in the rotary drum 2 increases greatly, the oxygen concentration meter 25 detects the oxygen concentration at this time. The oxygen concentration signal obtained by this detection is transmitted to the abnormality determination device 26, and the difference from the reference value is calculated according to the algorithm. The increased oxygen concentration has a large difference from the reference value, and is determined to be abnormal by comparing with the allowable value. At this time, an alarm notifying the oxygen concentration abnormality is output from the abnormality determination device 26.
[0059]
On the other hand, when the amount of air flowing in decreases, the abnormality determination device 26 is provided with an oxygen concentration signal indicating a sufficiently reduced oxygen concentration, and the difference from the reference value is calculated by calculation. The decrease in oxygen concentration reduces the difference from the reference value, and the oxygen concentration falls within the allowable value range. At this time, a command based on an alarm is not output from the abnormality determination device 26 due to normality determination.
[0060]
Thus, by detecting an abnormal increase in the oxygen concentration in the rotating drum 2 and making an abnormality determination based on this detection, the abnormality can be notified to immediately take measures such as stopping the thermal decomposition apparatus. As a result, it is possible to prevent the operation that impairs soundness from continuing for a long time, for example, local combustion occurs without noticing the abnormality of the oxygen concentration.
[0061]
Note that the concentration value detected by the monitoring device 24 of the rotary drum 2 in the present embodiment may be a nitrogen concentration instead of oxygen. Alternatively, the carbon dioxide concentration may be detected. In this case, the monitoring device 24 includes a nitrogen concentration meter and a carbon gas concentration meter instead of the oxygen concentration meter 25.
[0062]
Thus, in the present embodiment, the specific gas concentration in the rotary drum 2 is detected, and based on this, the presence or absence of abnormality is determined, and when there is an abnormality, the operator is notified of the abnormality in gas concentration. It is possible to eliminate the risk of continued operation that impairs the soundness of the thermal decomposition apparatus.
[0063]
【The invention's effect】
In the waste treatment method of the present invention, NH ₃ is fixed as a salt in the pyrolysis gas reforming step, so that generation of hydrogen cyanide can be prevented, and the product is made harmless so that waste It becomes possible to improve safety in processing.
[0064]
Further, in the thermal decomposition apparatus of the present invention, it is possible to avoid an increase in the amount of oxygen due to air leakage, or to prevent air from being simultaneously carried along with the object to be processed. Therefore, it is possible to reliably suppress the occurrence of local combustion in the rotating drum.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a waste treatment system used in first to eighteenth embodiments of the present invention.
FIG. 2 is a block diagram showing a waste treatment system used in a nineteenth embodiment of the present invention.
FIG. 3 is a configuration diagram showing a waste treatment system used in a twentieth embodiment of the present invention.
FIG. 4 is a configuration diagram showing a thermal decomposition apparatus according to a twenty-first embodiment of the present invention.
FIG. 5 is a block diagram showing a thermal decomposition apparatus according to a twenty-second embodiment of the present invention.
FIG. 6 is a configuration diagram showing a thermal decomposition apparatus according to a twenty-third embodiment of the present invention.
FIG. 7 is a configuration diagram showing a thermal decomposition apparatus according to a twenty-fourth embodiment of the present invention.
FIG. 8 is a block diagram showing a thermal decomposition apparatus according to a twenty-fifth embodiment of the present invention.
FIG. 9 is a configuration diagram showing an example of a conventional thermal decomposition apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Waste supply mechanism 2 Rotating drum 5 Combustion chamber 11 Pretreatment system 12 Pyrolysis furnace 13 Gas reformer 14 Gas purification device 15 Gasification melting furnace 17, 20 Exhaust gas supply device 21 Nitrogen gas supply device

Claims (20)

A process of crushing waste to obtain a processed material having a uniform size;
A step of thermally decomposing the obtained object to produce pyrolysis gas and pyrolysis residue;
A step of modifying the obtained pyrolysis gas into a combustible gas;
Gasifying and melting the obtained pyrolysis residue to produce a combustible gas and molten slag;
In a waste treatment method comprising a step of purifying the obtained combustible gas into a clean combustible gas,
A waste treatment method, wherein an organic halogen compound is added to a pyrolysis gas in the pyrolysis gas reforming step and reacted at the same time.   2. The waste treatment method according to claim 1, wherein the organic halogen compound is a halogen-substituted hydrocarbon of a chain hydrocarbon.   The waste treatment method according to claim 1, wherein the organic halogen compound is a fluorine-substituted product of a chain hydrocarbon.   2. The waste treatment method according to claim 1, wherein the organic halogen compound is a fluorine-substituted alkane.   2. The waste treatment method according to claim 1, wherein the organic halogen compound is a fluorine-substituted product of methane and ethane.   The waste treatment method according to claim 1, wherein the organic halogen compound is a substituted product of fluorine and chlorine of a chain hydrocarbon.   2. The waste treatment method according to claim 1, wherein the organic halogen compound is a fluorine and chlorine substitute of an alkane.   The waste treatment method according to claim 1, wherein the organic halogen compound is a chlorofluorocarbon. The waste treatment method according to claim 8, wherein the chlorofluorocarbon is Freon-11 (CCl ₃ F). The waste treatment method according to claim 8, wherein the chlorofluorocarbon is Freon-12 (CCl ₂ F ₂ ). 9. The waste treatment method according to claim 8, wherein the chlorofluorocarbon is Freon-21 (CHCl ₂ F). Waste treatment method according to claim 8, wherein the chlorofluorocarbon is characterized a freon -22 (CHClF _2). Waste treatment method according to claim 8, wherein the chlorofluorocarbon is characterized a chlorofluorocarbon _{-112 (C 2 Cl 4 F 2} ). The waste treatment method according to claim 8, wherein the chlorofluorocarbon is Freon-113 (C ₂ Cl ₃ F ₃ ). The waste treatment method according to claim 8, wherein the chlorofluorocarbon is Freon-114 (C ₂ Cl ₂ F ₄ ). The waste treatment method according to claim 8, wherein the chlorofluorocarbon is Freon-115 (C ₂ ClF ₅ ).   The waste treatment method according to claim 8, wherein the chlorofluorocarbon is a chlorofluorocarbon recovered as a refrigerant.   The waste treatment method according to claim 8, wherein the chlorofluorocarbon is an aerosol collected and used as a propellant. A process of crushing waste to obtain a processed material having a uniform size;
A step of thermally decomposing the obtained object to produce pyrolysis gas and pyrolysis residue;
A step of reforming the obtained pyrolysis gas into a combustible gas;
Gasifying and melting the obtained pyrolysis residue to produce a combustible gas and molten slag;
In a waste treatment method comprising a step of refining the obtained combustible gas into a clean combustible gas,
A waste treatment method characterized by simultaneously decomposing urethane foam foamed with an organic halogen compound in a thermal decomposition step of an object to be treated.   20. The waste treatment method according to claim 19, wherein the urethane foam is a heat insulating material for urethane foam that is used in a product and then recovered.

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