JPH10169961A - Waste treatment plant and incineration ash treatment method - Google Patents

Abstract

(57) [Problem] To provide a waste treatment plant for detoxifying and reducing incinerated ash discharged from various plants using coal or petroleum as fuel, and recovering valuable metals. SOLUTION: In a waste treatment plant for treating incinerated ash discharged from a plant such as a thermal power plant using coal or petroleum as a fuel, a municipal solid waste incineration plant or a sewage treatment incineration plant, the incinerated ash is converted into a thermal plasma and a reducing gas. It has a high-temperature reaction section that decomposes at a high temperature and a metal trap section that selectively recovers the metal reduced in the high-temperature reaction section, and is configured to recover the metal components contained in the incineration ash. In this process, the reduction reaction by the reducing gas is promoted, the reduced metal is generated in a very short time, the resulting harmful and valuable metals are selectively separated and collected, and the remaining ash becomes molten slag, making it harmless. And volume and weight are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment plant for treating incinerated ash discharged from a thermal power plant, a municipal solid waste incineration plant or a sewage treatment incineration plant using coal or petroleum as fuel, and an incineration ash treatment therefor. About the method.

[0002]

2. Description of the Related Art For example, a conventional thermal power plant is shown in FIG.
As shown in FIG. 2, coal or petroleum fuel is sent from a coal storage or oil tank 14 to a boiler 15 and burned.
The fuel burned in the boiler 15 becomes a combustion gas to heat the evaporator tube 16 and turns the water in the evaporator tube 16 into steam. The steam is further sent to a steam turbine 18 through a superheater 17 to rotate the steam turbine, and a generator 19 on a rotating shaft is rotated to generate power and supply electric power.

[0003] On the other hand, the combustion gas discharged from the boiler 15 is discharged through a dust collector 12 and then discharged to the atmosphere from a chimney 13. Since the incinerated ash collected by the dust collector 12 contains harmful substances (lead, cadmium, etc.) contained in coal or petroleum, it needs to be treated as industrial waste, and the ash as a management type disposal site is required. Dumping ground (not shown)
To be disposed of. Further, in a thermal power generation system using coal as fuel, the same disposal treatment is required for bottom ash remaining in the boiler 15.

[0004]

In the case of a conventional thermal power plant system, for example, a coal-fired power plant system, a large amount of coal ash of up to several tens of thousands tons is discharged annually, and a vast landfill site is disposed for disposal. On the plant premises, and furthermore, environmental measures such as prevention of incineration ash scattering had to be taken. If there is no disposal site for treating industrial waste, it is necessary to entrust industrial waste to a waste disposal company.

[0005] This impairs economic efficiency due to the required site of the thermal power plant system and the cost of treating incinerated ash, and there is a demand for detoxification and reuse of waste from the viewpoint of environmental regulations.

The present invention has been made in view of the above circumstances, and an object of claims 1 to 10 is to reduce incinerated ash discharged from a plant such as a thermal power plant, a municipal solid waste incineration plant or a sewage treatment incineration plant. It is an object of the present invention to provide a thermal plasma incineration ash processing device capable of detoxifying and reducing the amount of valuable metals and recovering valuable metals, and a waste treatment plant incorporating the incineration ash processing device.

Another object of the present invention is to make incinerated ash discharged from a plant such as a thermal power plant, a municipal solid waste incineration plant or a sewage treatment incineration plant harmless, to reduce the amount thereof, and to collect valuable metals. It is to provide a processing method.

[0008]

In order to achieve the above object, a first aspect of the present invention is a method for discharging coal from a plant such as a thermal power plant, a municipal solid waste incineration plant, or a sewage incineration plant. In a waste treatment plant that treats incinerated ash, a high-temperature reaction unit that decomposes the incinerated ash at a high temperature by thermal plasma and a reducing gas, and a metal trap unit that selectively collects the metal reduced in the high-temperature reaction unit, The metal component contained in the incineration ash is recovered.

According to a second aspect of the present invention, in the waste treatment plant according to the first aspect, the metal trap portion includes a nozzle for rapidly cooling a high-temperature plasma gas as a thermal fluid, and a gas reservoir connected to the nozzle. And a magnetic separation device that separates and collects metals solidified by adiabatic expansion downstream of the gas in the gas reservoir.

According to a third aspect of the present invention, in the waste treatment plant according to the second aspect, a plurality of magnetic separation devices for separating and collecting metals solidified by adiabatic expansion are provided.

According to a fourth aspect of the present invention, in the waste disposal plant according to the first aspect, the metal trap section includes an induction coil, a coil power supply for applying an electric field to the induction coil, and a liquid reservoir. It is an induction heating thermostat.

According to a fifth aspect of the present invention, in the waste treatment plant according to the fourth aspect, the induction heating constant temperature capable of controlling the temperature is provided in a plurality of stages. Claim 6 of the present invention relates to a waste treatment plant according to claim 1,
The metal trap section is a high-temperature heater heating constant temperature bath including a high-temperature heater cable, a heater power supply for applying a current to the high-temperature heater cable, and a liquid reservoir.

A seventh aspect of the present invention is a waste treatment plant for treating incinerated ash discharged from a plant such as a thermal power plant using coal or petroleum as a fuel, a municipal waste incineration plant or a sewage treatment incineration plant. The metal oxide, which is a constituent of incineration ash, is melted and vaporized by the reduction action of induction heating in a neutral gas atmosphere, and the molten incineration ash comes into contact with the reducing gas by convection to become liquid metal, and this liquid metal has specific gravity The incineration is provided with a high-temperature reaction section in which a substance separated from ash and the like by a difference and vaporized is reduced to metal vapor by a reaction with a reducing gas, and a metal trap section for recovering the metal reduced in the high-temperature reaction section. It is characterized by recovering the metal component contained in the ash.

According to an eighth aspect of the present invention, in the waste treatment plant according to the seventh aspect, the high-temperature reaction section heats the incinerated ash to a high temperature by induction heating, and applies an electric field to the induction coil. And a coil power supply.

[0015] A ninth aspect of the present invention is a waste treatment plant for treating incineration ash discharged from a plant such as a municipal waste incineration plant or a sewage treatment incineration plant using coal or petroleum as a fuel. A dewatering cake that removes water to some extent from the sediment of municipal waste or sewage sludge, a combustion furnace that incinerates this municipal waste or dewatered cake, a waste heat boiler that recovers the heat generated by the combustion of this combustion furnace, A dust collector that collects combustion dust from the furnace, a high-temperature reaction unit that generates metal by a reduction reaction under high temperature from bottom ash remaining in the combustion furnace and incineration ash collected by the dust collector, And a metal trap section for collecting the metal reduced in the reaction section.

A tenth aspect of the present invention is a method for treating incinerated ash discharged from a plant such as a thermal power plant, a municipal solid waste incineration plant or a sewage treatment incineration plant using coal or oil as a fuel. The incinerated ash is decomposed at high temperature by thermal plasma and reducing gas in the high-temperature reaction section, and a voltage is applied to the induction coil so that the metal reduced in the high-temperature reaction section always exceeds the melting point of the metal. A method for treating incineration ash, wherein the temperature can be controlled by adjusting the voltage applied to the coil.

The present invention provides a method of treating incinerated ash for treating incinerated ash discharged from a plant such as a thermal power plant using coal or petroleum as a fuel, a municipal solid waste incineration plant, or a sewage treatment incineration plant. The temperature of the incinerated ash can be controlled by adjusting the intensity of the current applied to the high-temperature heater cable so that the temperature of the incinerated ash is always equal to or higher than the melting point of the metal in the high-temperature heater heating constant temperature bath.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a configuration diagram of a first embodiment (corresponding to claims 1 to 3) of the present invention. As shown in the figure, the present embodiment is different from the conventional example of FIG. 6 already described in that the bottom ash remaining in the boiler 15 and the incinerated ash collected by the dust collector 12 are disposed in an ash dump in the conventional example. Although it was discarded, in this embodiment, only the incineration ash is treated by the incineration ash treatment device, and the other points are the same. Therefore, the same parts as those in the conventional example of FIG. A description is given below.

The incineration ash treatment apparatus of the present embodiment uses the reduction action of thermal plasma to convert metal atoms, ions,
A high-temperature reaction unit 1 for generating steam, a reducing gas supply device 2 for supplying a reducing gas to the thermal plasma, an incineration ash supply device 3 for introducing incineration ash into the thermal plasma, and a metal reduced in the high-temperature reaction unit 1 And a gas exhaust pipe 5.

The metal trap 4 is provided with a nozzle 4a for rapidly cooling a high-temperature plasma gas as a thermal fluid.
, A gas reservoir 4b, and a magnet 4c and a filter 4d which constitute a magnetic separation device and are disposed downstream of the gas reservoir 4b on the gas side.

Further, the high temperature reaction section 1 has the following characteristics. (1) Since the temperature is high, the material to be heated can be heated to high temperature in a short time. (2) The thermal plasma itself becomes a source of ions and radicals and is highly active. (3) A special reaction atmosphere can be freely selected. As described above, the thermal plasma is an excellent high-temperature heating source with high flexibility, and uses the above characteristics to reduce and detoxify incinerated ash and to recover resources.

Next, a procedure for treating incinerated ash by the incinerated ash treating apparatus of this embodiment will be described. In the first step,
The incinerated ash is continuously supplied from the incinerated ash supply device 3 to the high temperature reaction section 1.

In the second step, metal oxides (silica, alumina, lead oxide, zinc oxide,
Nickel oxide, chromium oxide, etc.) are instantaneously decomposed into metal atoms and ions and oxygen atoms and ions by the high temperature of the thermal plasma.

In the third step, the reduction of the metal oxide is promoted by a reducing gas such as hydrogen and methane added simultaneously from the reducing gas supply device 2, and the recombination of the metal and oxygen is suppressed.

In the fourth step, metal atoms, ions, vapors, and the like in the plasma gas are discharged from the high-temperature reaction section 1 to the gas reservoir 4b at once through the nozzle 4a. At this time, adiabatic expansion occurs, and the metal atoms, ions, vapor, and the like in the high-temperature gas flow are instantaneously cooled and solidified while maintaining the form of a single metal.

In the fifth step, the crystallized metal fine particles are separated from plasma gas, ash, etc. by a difference in magnetic susceptibility in a magnetic field generated by a magnet 4c disposed downstream of the gas reservoir 4b. Collected by the filter 4d.
Since each metal has a different magnetic susceptibility for each component, the magnet 4
By changing the strength of the magnetic field c in order, it is possible to recover each component. In the sixth step, the plasma gas is exhausted from the gas exhaust pipe 5.

As described above, the incineration ash treatment apparatus of the present embodiment includes the high-temperature reaction section 1 using thermal plasma and the metal trap section 4 for collecting the metal components generated by reduction in the high-temperature reaction section 1. Is done. The thermal plasma source, which is the high-temperature reaction section 1, is a thermal fluid having a high temperature of 10,000K or more. Here, atoms, ions, and vapors of the metal generated by the reduction reaction pass through a structure that causes adiabatic expansion. By doing so, it is rapidly cooled and solidified to become a solid metal. As a result, the metal contained in the incineration ash is in a recoverable form, so that it is possible to make the incineration ash harmless, reduce its volume, and recover resources.

Further, by controlling the magnetic field using a single or a plurality of stages of magnetic separation devices, the metal solidified by adiabatic expansion can be selectively separated according to the difference in individual magnetic susceptibility.

FIG. 2 is a block diagram of a second embodiment of the present invention (corresponding to claims 4, 5, and 10).
As shown in the drawing, this embodiment differs from the first embodiment of FIG. 1 only in that an induction heating constant temperature bath 6 is used as a metal trap portion, and other points are the same. 1
The same parts as those in the embodiment will be described with the same reference numerals.

The incineration ash treatment apparatus of the present embodiment uses the reduction action by thermal plasma to convert metal atoms, ions,
A high-temperature reaction unit 1 for generating steam, a reducing gas supply device 2 for supplying a reducing gas to the thermal plasma, an incineration ash supply device 3 for introducing incineration ash into the thermal plasma, and a metal reduced in the high-temperature reaction unit 1 It consists of an induction heating constant temperature bath 6 which is a metal trap unit for recovering the temperature and keeps the temperature constant, and a gas exhaust pipe 5.

The induction heating constant temperature bath 6 includes an induction coil 6
a, a coil power supply 6b for applying an electric field to the induction coil 6a, and a liquid reservoir 6c. The induction heating constant temperature bath 6 is always heated to a temperature equal to or higher than the melting point of the metal.
The temperature can be controlled by adjusting the intensity of the electric field applied to the induction coil 6a by the coil power supply 6b.

Next, the procedure for treating incinerated ash according to this embodiment will be described. When the incinerated ash introduced from the incinerated ash supply device 3 into the high-temperature reactor 1 is heated to a high temperature by the thermal plasma, the metal oxides, which are constituents of the incinerated ash, are converted into metal atoms / ions and oxygen atoms / ions. Decomposed. Reduction of the metal oxide is promoted by the effect of the reducing gas simultaneously added from the reducing gas supply device 2, and recombination between the metal and oxygen is suppressed. The generated metal atoms, ions, vapor, and the like are introduced into the induction heating constant temperature bath 6 together with the plasma gas, and are cooled to store the liquid metal in the liquid reservoir 6c of the induction heating constant temperature bath 6. By controlling the temperature of the induction heating constant temperature bath 6 to the melting point temperature of the metal, the metal can be aggregated in the liquid reservoir 6c. By combining a plurality of stages of the induction heating thermostat 6 and controlling each temperature to the melting point of each of various metals, a specific metal can be aggregated in the specific reservoir 6c. Further, metals having similar melting points can be separated from each other by a specific gravity difference in the liquid reservoir 6c.

As described above, the incineration ash treatment apparatus of the present embodiment is provided with the induction heating constant temperature bath 6 as a high-temperature reaction section by thermal plasma and a metal trap section for collecting metal components reduced and generated in the high-temperature reaction section. ing. The atoms, ions, vapors, etc. of the metal generated by the thermal plasma are trapped in a single or a plurality of temperature-controlled thermostats, and are liquefied and solidified. An induction heating furnace, a high-temperature heater cable, or the like can be used for heating and controlling the temperature of the constant temperature bath.
As a result, the metal contained in the incinerated ash can be recovered, so that it is possible to make the incinerated ash harmless, reduce its volume, and recover resources.

FIG. 3 is a block diagram of a third embodiment (corresponding to claims 6 and 11) of the present invention. As shown in the figure,
This embodiment is different from the first embodiment of FIG. 1 only in that a high-temperature heater-heating constant temperature bath 7 is used as a metal trap portion, and the other points are the same. Parts will be described with the same reference numerals.

The incineration ash treatment apparatus according to the present embodiment uses the reducing action of thermal plasma to convert metal atoms, ions,
A high-temperature reaction unit 1 for generating steam, a reducing gas supply device 2 for supplying a reducing gas to the thermal plasma, an incineration ash supply device 3 for introducing incineration ash into the thermal plasma, and a metal reduced in the high-temperature reaction unit 1 It is composed of a high-temperature heater heating constant temperature bath 7 which is a metal trap unit for recovering the temperature and maintains a constant temperature, and a gas exhaust pipe 5.

The high-temperature heater heating constant temperature bath 7 includes a high-temperature heater cable 7a using a material capable of withstanding high temperatures such as a tungsten wire, a heater power supply 7b for applying a current to the high-temperature heater cable 7a, and a liquid reservoir 7c. It is composed of The temperature of the high-temperature heater heating constant temperature bath 7 can be controlled by adjusting the intensity of the current applied to the high-temperature heater cable 7a by the heater power supply 7b so that the temperature is always equal to or higher than the melting point of the metal.

Next, the procedure for treating incinerated ash according to this embodiment will be described. When the incinerated ash introduced from the incinerated ash supply device 3 to the high temperature reaction section 1 is heated to a high temperature by the thermal plasma,
Metal oxides, which are constituents of incineration ash, are decomposed into metal atoms and ions and oxygen atoms and ions. The reduction of the metal oxide is promoted by the effect of the reducing gas added simultaneously from the reducing gas supply device 2, and the recombination of the metal and oxygen is suppressed. The generated metal atoms, ions, vapors, etc. are introduced into the high temperature heater heating constant temperature bath 7 together with the plasma gas.
The liquid metal is cooled and accumulates in the liquid reservoir 7c of the high-temperature heater heating constant temperature bath 7. The temperature of the high-temperature heater heating constant temperature bath 7 is
By controlling the temperature to the melting point of the metal, the metal can be aggregated in the liquid reservoir 7c.

Further, by combining a plurality of high temperature heater heating and constant temperature baths 7 and controlling the temperature to the melting point of various metals, a specific metal can be aggregated in a specific liquid reservoir 7c. Further, metals having similar melting points can be separated from each other by a specific gravity difference in the liquid reservoir 7c.

As described above, according to the present embodiment, oxygen can be removed from the metal oxide constituting the incinerated ash, and the incinerated ash can be separated and taken out in the form of a single metal. And can be recovered as metal resources.

FIG. 4 is a block diagram of a fourth embodiment (corresponding to claims 7 and 8) of the present invention. As shown in the figure, the present embodiment differs from the first embodiment of FIG. 1 only in that a high-temperature reaction section 8 having an induction coil 8a is provided in place of the high-temperature reaction section 1 by thermal plasma. Since the other points are the same, the same parts as those in the first embodiment are denoted by the same reference numerals and described.

The incineration ash treatment apparatus of the present embodiment includes a high-temperature reaction section 8 which generates metal atoms, ions, and vapors from incineration ash by a reducing action by induction heating in a reducing gas atmosphere.
And a reducing gas supply device 2 for supplying a reducing gas to the high temperature reaction unit 8, an incineration ash supply device 3 for introducing incineration ash into the high temperature reaction unit 8, and a metal for collecting the metal reduced in the high temperature reaction unit 8 It comprises a trap section 4 and a gas exhaust pipe 5. The high-temperature reaction section 8 includes an induction coil 8a and a coil power supply 8b for applying an electric field to the induction coil 8a.

Next, the procedure for treating incinerated ash according to this embodiment will be described. When the incinerated ash introduced from the incinerated ash supply device 3 to the high-temperature reaction section 8 is heated to a high temperature by induction heating,
Metal oxides, which are constituents of incineration ash, melt and partially vaporize. The molten incinerated ash comes into contact with the reducing gas by convection to become liquid metal. The vaporized substance is also reduced to metal vapor by a reaction with the reducing gas. The liquid metal is separated from the ash and the like by a difference in specific gravity and collected. Further, the metal vapor is collected by any one of the various metal trap methods described in the first to third embodiments.

As described above, the incineration ash treatment apparatus of this embodiment includes an incineration ash treatment apparatus 3, a high-temperature reaction section 8 for inductively heating incineration ash in a reducing atmosphere, and a metal trap section for collecting generated metal components. And 4. In the high-temperature reaction section 8, the incinerated ash melted and vaporized by the induction heating is reduced by a reaction with the reducing gas, so that liquid metal or metal vapor can be generated. Claim 1. These liquid metals and metal vapors
By applying any one of the configurations described in any one of to 7, since the metal contained in the incinerated ash can be recovered, it is possible to make the incinerated ash harmless, reduce the volume, and recover resources.

FIG. 5 is a system configuration diagram of a waste treatment plant according to a fifth embodiment (corresponding to claim 9) of the present invention. As shown in the figure, the waste treatment plant of the present embodiment has a waste pit into which municipal waste is charged in the case of a municipal waste treatment plant (or, in the case of a sewage sludge treatment plant, water from sewage sludge obtained by sedimentation). A dewatering machine for removing dewatered cake to some extent), a combustion furnace 10 for incinerating municipal waste (or dewatered cake), a waste heat boiler 11 for recovering heat generated by combustion, and a dust collector 12, Chimney 13
A high-temperature reactor 1 that generates a metal from a bottom ash remaining in the combustion furnace 10 and incineration ash collected by the dust collector 12 at a high temperature, and a reducing gas that supplies a reducing gas to the high-temperature reactor 1 The apparatus includes a supply device 2, an incineration ash introduction device 3 for introducing incineration ash into the high-temperature reaction section, a metal trap section 4 for collecting metal reduced in the high-temperature reaction section 1, and a gas exhaust pipe 5.

Next, the processing procedure of this embodiment will be described. The municipal waste (or dewatered cake) is sent from a refuse pit (or a dehydrator that removes water to some extent from sewage sludge) 9 into which the municipal waste is charged, and is sent to a combustion furnace 10 where it is incinerated. The high-temperature combustion gas generated in the combustion furnace 10 is heat-recovered by the waste heat boiler 11, then is dust-removed through the dust collector 12, and is discharged from the chimney 13 to the atmosphere. The incinerated ash collected from the bottom of the combustion furnace 10 and the dust collector 12 is supplied to the incinerated ash supply device 3.
To the high-temperature reaction section 1 to cause a reduction reaction by thermal plasma or induction heating to generate a metal. The generated metal is recovered by any of the various metal trapping methods described in detail in the first to third embodiments.

As described above, the waste treatment plant of the present embodiment uses the municipal solid waste incineration ash and the sewage sludge incineration ash generated by incineration in the municipal solid waste treatment plant and the sewage sludge treatment plant. Oxygen can be removed from the metal oxides that make up municipal solid waste incineration ash or sewage sludge incineration ash by treating it with an incineration ash treatment device, and it can be separated and taken out in the form of a single metal. Alternatively, it is possible to configure a waste treatment plant capable of detoxifying and reducing the volume of sewage sludge incineration ash and, at the same time, recovering it as a metal resource.

[0047]

As described above, according to the first aspect of the present invention,
According to the waste treatment plant of the present invention, the metal oxides (alumina, silica, lead oxide, zinc oxide, nickel oxide, chromium oxide, etc.) contained in the incinerated ash are reduced gas in a high temperature field of thermal plasma. Promotes the reduction reaction,
The reduced metal is formed in a very short time. The obtained harmful metals and valuable metals are selectively separated and collected, and the remaining ash becomes molten slag, which is rendered harmless and reduced in volume and weight. Therefore, it becomes possible to use valuable resources contained in the incinerated ash as resources and to effectively use slag for industrial materials, etc., and also to achieve excellent thermal power generation plants or municipal solid waste treatment plants in terms of both environmental pollution prevention and resource recycling. A waste treatment plant such as a sewage sludge treatment plant can be provided.

According to the waste treatment plants of the present invention, the metal oxides (alumina, silica, lead oxide, zinc oxide, nickel oxide, chromium oxide, etc.) contained in the incinerated ash Generates a metal that is reduced in a very short time by a reducing action by induction heating in a reducing gas atmosphere. The resulting harmful and valuable metals are selectively separated and collected, and the remaining ash becomes molten slag,
Detoxification, volume reduction and weight reduction. Therefore, it becomes possible to use valuable resources contained in the incinerated ash as resources and to effectively use slag for industrial materials, etc., and also to achieve excellent thermal power generation plants or municipal solid waste treatment plants in terms of both environmental pollution prevention and resource recycling. A waste treatment plant such as a sewage sludge treatment plant can be provided.

Furthermore, according to the ninth aspect of the present invention, since the incinerated ash discharged in large quantities from the municipal solid waste treatment plant and the sewage sludge treatment plant can be reduced in volume, made harmless and recycled, It is possible to reduce the site used as equipment and eliminate the incineration ash scattering prevention treatment, and it is also possible to use valuable resources contained in the incineration ash as resources and effectively use slag as industrial materials. At the same time, it is possible to provide a waste treatment plant such as an municipal solid waste treatment plant or a sewage sludge treatment plant that is excellent in both environmental pollution prevention and resource recycling.

Further, according to the incineration ash treatment method of the tenth and eleventh aspects of the present invention, metal oxides (alumina, silica, lead oxide, zinc oxide, nickel oxide, chromium oxide, etc.) contained in the incineration ash In (2), in a high-temperature field of thermal plasma, a reduction reaction by a reducing gas is promoted, and a reduced metal is generated in an extremely short time. Alternatively, a reduced metal is generated in a very short time by a reducing action by induction heating in a reducing gas atmosphere. The obtained harmful metals and valuable metals are selectively separated and collected, and the remaining ash becomes molten slag, which is rendered harmless and reduced in volume and weight.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a first embodiment of the present invention.

FIG. 2 is a system configuration diagram of a second embodiment of the present invention.

FIG. 3 is a system configuration diagram of a third embodiment of the present invention.

FIG. 4 is a system configuration diagram of a fourth embodiment of the present invention.

FIG. 5 is a system configuration diagram of a waste treatment plant according to a fifth embodiment of the present invention.

FIG. 6 is a system configuration diagram of a conventional thermal power plant system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... High temperature reaction part, 2 ... Reducing gas supply apparatus, 3 ... Incineration ash introduction apparatus, 4 ... Metal trap part, 4a ... Nozzle, 4b ... Gas reservoir, 4c ... Magnet, 4d ... Filter, 5 ... Gas exhaust pipe, 6 ... Induction heating constant temperature bath, 6a ... Induction coil, 6b ... Coil power supply, 6c ... Liquid reservoir, 7 ... High temperature heater heating constant temperature bath,
7a: High-temperature heater cable, 7b: Heater power supply, 7c ...
Reservoir, 8: high temperature reaction section, 8a: induction coil, 8b: coil power supply, 9: refuse pit / dehydrator, 10: combustion furnace, 1
DESCRIPTION OF SYMBOLS 1 ... Waste heat boiler, 12 ... Dust collector, 13 ... Chimney, 14 ... Coal storage or oil tank, 15 ... Boiler, 16 ... Evaporator tube, 17 ... Superheater, 18 ... Steam turbine, 19 ... Generator.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FIF23G 5/00 115 B09B 3/00 303L

Claims (11)

[Claims] 1. A waste treatment plant for treating incinerated ash discharged from a plant such as a thermal power plant using coal or petroleum as a fuel, a municipal solid waste incineration plant or a sewage treatment incineration plant. A waste treatment plant comprising: a high-temperature reaction section that decomposes at a high temperature by a reducing gas; and a metal trap section that selectively recovers the metal reduced in the high-temperature reaction section, and recovers a metal component contained in the incinerated ash. . 2. The waste treatment plant according to claim 1, wherein the metal trap portion includes a nozzle for rapidly cooling a high-temperature plasma gas as a thermal fluid, a gas reservoir connected to the nozzle, and a gas reservoir connected to the nozzle. A waste treatment plant comprising: a magnetic separation device that separates and collects metals solidified by adiabatic expansion on the downstream side of the gas. 3. The waste treatment plant according to claim 2, wherein a plurality of magnetic separation devices for separating and collecting metals solidified by adiabatic expansion are arranged. 4. The waste treatment plant according to claim 1, wherein the metal trap portion is an induction heating constant temperature bath including an induction coil, a coil power supply for applying an electric field to the induction coil, and a liquid reservoir. A waste treatment plant, characterized in that: 5. The waste treatment plant according to claim 4, wherein said induction heating constant temperature controllable in a plurality of stages is arranged. 6. The waste treatment plant according to claim 1, wherein the metal trap section includes a high-temperature heater cable,
A waste treatment plant comprising a high-temperature heater heating constant-temperature bath provided with a heater power supply for applying a current to the high-temperature heater cable and a liquid reservoir. 7. A waste treatment plant for treating incineration ash discharged from a plant such as a thermal power plant, a municipal solid waste incineration plant or a sewage treatment incineration plant using coal or oil as fuel, in a reducing gas atmosphere. The metal oxides, which are constituents of the incinerated ash, are melted and vaporized by the reduction action due to the induction heating of the ash, and the molten incinerated ash comes into contact with the reducing gas by convection to become liquid metal, which is separated from ash etc. by the difference in specific gravity A high-temperature reaction section in which the vaporized substance is reduced to a metal vapor by a reaction with a reducing gas; and a metal trap section for recovering the metal reduced in the high-temperature reaction section. Waste treatment plant characterized by recovering wastewater. 8. The waste treatment plant according to claim 7, wherein the high-temperature reaction section includes an induction coil for heating the incinerated ash to a high temperature by induction heating, and a coil power supply for applying an electric field to the induction coil. Waste treatment plant characterized by the following. 9. A waste treatment plant for treating incineration ash discharged from a plant such as a municipal waste incineration plant or a sewage treatment incineration plant using coal or petroleum as a fuel, wherein municipal waste or sewage sludge obtained from a waste pit is removed. A dewatering cake that removes some water from the sediment, a combustion furnace that incinerates the municipal waste or dewatered cake, a waste heat boiler that recovers the heat generated by the combustion of the combustion furnace, and collects the combustion dust from the combustion furnace. A dust collector, a high-temperature reaction section that generates metal by a reduction reaction at a high temperature from bottom ash remaining in the combustion furnace and incineration ash collected in the dust collector, and reduced in the high-temperature reaction section. A waste treatment plant comprising a metal trap unit for collecting metal. 10. A method for treating incinerated ash discharged from a plant such as a thermal power plant, a municipal solid waste incineration plant or a sewage treatment incineration plant using coal or petroleum as a fuel. A high voltage is applied to the induction coil so that the metal reduced in the high temperature reaction section is always at or above the melting point of the metal, and the voltage applied to the induction coil is further increased. A method for treating incineration ash, wherein the temperature can be controlled by adjusting the temperature. 11. A method for treating incinerated ash discharged from a plant such as a thermal power plant, a municipal solid waste incineration plant or a sewage treatment incineration plant using coal or petroleum as a fuel. A method for treating incineration ash, characterized in that the temperature can be controlled by adjusting the intensity of the current applied to the high-temperature heater cable so that the temperature is always equal to or higher than the melting point of the metal in the constant temperature bath.