JP2000018526A - Dioxin decomposing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decompose the causative substance of environmental pollution or dioxin by a simple device before the dioxin is discharged out of a combustion chamber. SOLUTION: A dioxin decomposing device is constituted of an outside cylindrical body 1, having resistance to heat and electric insulating property, an inside cylindrical body 2, received in the outside cylindrical body 1 and having resistance to heat and electric insulating property, a high-temperature heating body 3, having heating passages 3b therein and consisting of electric conductive body received in the inside cylindrical body 2, and a work coil 4 for a high-frequency induction heating device, which is arranged around the inside cylindrical body 2. According to this constitution, most of dioxin generated in the combustion chamber can be decomposed substantially perfectly, whereby the device can remarkably contribute to the prevention of environmental pollution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dioxin decomposing apparatus for decomposing dioxin discharged from a combustion chamber of a boiler, an incinerator or the like.

[0002]

2. Description of the Related Art Conventionally, when a substance containing an aromatic chlorine compound such as polychlorobiphenyl or hexachlorobenzene is burned in a combustion chamber such as a boiler or an incinerator, dioxin is generated.

[0003]

Dioxin is composed of two benzene rings linked by two oxygen atoms,
This is an abbreviation for polychlorodibenzoparadioxin in which chlorine atoms are attached to the benzene ring, and there are 200 or more isomers depending on the number and position of chlorine atoms. The most toxic ones are teratogenic, carcinogenic, cause immune abnormalities, visceral disorders, and are not easily degraded. This contributes to environmental pollution caused by incineration of industrial waste and garbage.
This dioxin is generated in low-temperature combustion, but due to structural reasons such as the material of the combustion chamber and economics, combustion is not performed at a high temperature enough to decompose dioxin except in special cases. .

An object of the present invention is to decompose dioxin, which is a substance causing environmental pollution, before being discharged from a combustion chamber by using a simple device.

[0005]

SUMMARY OF THE INVENTION A dioxin decomposing apparatus according to the present invention comprises a heat-resistant and electrically insulating outer cylinder 1.
And a high temperature made of a heat-resistant and electrically insulating inner cylinder 2 housed inside the outer cylinder 1 and an electric conductor having a heating path 3b therein and housed inside the inner cylinder 2. Heating element 3,
It comprises a work coil 4 of a high-frequency induction heating device arranged around the inner cylinder 2.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an embodiment of a dioxin decomposing apparatus according to the present invention will be described.

This dioxin decomposing apparatus comprises a ceramic outer cylinder 1, a ceramic inner cylinder 2 housed inside the outer cylinder 1, and a graphite housed inside the inner cylinder 2. It is composed of a high-temperature heating body 3 and a work coil 4 of a high-frequency induction heating device wound around the inner cylinder 2.

The outer cylinder 1 may be made of any material as long as it has heat resistance and electrical insulation. Here, ceramic is used. An annular step 1a for supporting the inner cylinder 2 is formed at an intermediate portion of the outer cylinder 1.

The inner cylinder 2 may be made of any material as long as it has heat resistance and electrical insulation. Ceramic is also used here. Each end of the inner cylinder 2 has a high-temperature combustion body 3
A flange portion 2a is formed so as not to fall off.

The high-temperature heating element 3 may be made of a metal such as iron as long as it is an electric conductor capable of withstanding a heating temperature described later, but graphite is used here. The high-temperature heating body 3 has a columnar appearance, and one or a plurality (three in the illustrated case) of spaces 3a are provided in the inside thereof.
The adjacent spaces 3a, 3a communicate with each other through a thin heating path 3b having a diameter of about 3 mm. Further, the outermost space 3a communicates with the outside through a heating path 3b. The heating paths 3b on both sides of the space 3a are shifted from each other. This is because the gas sent from a combustion chamber such as an incinerator does not flow straight, but passes slowly and is easily heated. Although the thermal decomposition of dioxin is mainly performed in the superheat path 3b, it is also performed in the space 3a.
Note that the space 3a and the heating path 3b are not clearly distinguished as described above, and the whole may be formed into a foamed foamed body.

The high-frequency induction heating device is a device for inductively heating a substance placed inside the work coil 4 connected to an AC power supply. In this case, when an alternating current flows through the work coil 4, an alternating magnetic flux is generated, which penetrates the high-temperature heater 3 such as graphite, which is a good conductor of electricity and heat, to induce an eddy current having a very high density. At that time, Joule heat is generated on the surface of the high temperature heater 3. The high frequency induction heating device utilizes the heat.

The work coil 4 used here is a pipe-shaped bare copper wire, and its hollow portion is supplied with cooling water for cooling so that the work coil 4 itself does not melt during heating. The number of turns of this coil is preferably four or more in order to obtain a sufficient heating temperature. If the voltage is high, it may be lower. Here, the heating temperature is adjusted according to the voltage and the number of turns of the work coil 4 so as to be 1400 ° C. or more necessary for decomposing dioxin.

The dioxin decomposing apparatus thus constructed is used by being attached to a suitable place such as a base or an outlet of an exhaust pipe of a combustion chamber. The gas containing dioxin, which is sent to the exhaust pipe of the combustion chamber,
And into the atmosphere via the space 3a. On the other hand, the high-temperature heating body 3
Heated above. Therefore, dioxin in the exhaust gas from the combustion chamber is also reduced to 14
It is heated above 00 ° C and decomposed into harmless substances by the heat.

[0014]

According to the present invention, dioxin generated in a combustion chamber can be almost completely decomposed by a simple, small-sized and inexpensive apparatus, which can greatly contribute to prevention of environmental pollution. Also, since the other parts of the combustion chamber are not heated to a high temperature, the structure of the material of the combustion chamber is not restricted, and the temperature of the combustion chamber itself can be set to the optimum heating temperature of the heating object. it can. Further, when the present apparatus is heated, it is not necessary to supply new air, so that carbon dioxide having a greenhouse effect is not generated there.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a dioxin decomposing apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Inner cylinder 3 High-temperature superheater 3a Space 3b Superheat path 4 Work coil

Claims (1)

[Claims] (1)
A heat-resistant and electrically insulating outer cylinder, a heat-resistant and electrically insulating inner cylinder housed inside the outer cylinder, and a heating path inside the inner cylinder. A dioxin decomposer comprising a high-temperature heating body made of a good electric conductor to be housed and a work coil of a high-frequency induction heating device arranged around the inner cylinder 2.