JP2001288474A - Dry distillation method and combustion method of urban waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved combustion method for rendering urban wastes harmless and recovering resources from urban wastes. SOLUTION: The treatment method comprises generation of stable, pollution- free carbide which does not emit toxic materials or heavy metals by dry distillation of urban wastes before complete combustion by a catalytic dry distillation plant. The method comprises grinding urban wastes, especially garbage, to fine powder, preferably fine powder with a smallness of 100-150 mesh, and then subjecting the same to dry distillation and carbonization. Any known method of complete combustion may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for carbonizing municipal garbage, particularly garbage, and a method for burning municipal garbage in which a carbonization process is provided in the process.

[0002]

2. Description of the Related Art Municipalities nationwide who collect, transport, treat and dispose of general household garbage and office garbage, whose emissions are increasing year by year nationwide, are in extreme difficulty. From now on, it is necessary to recycle garbage as producers, distributors, or consumers. And it must be safe for environmental protection.

[0003] Since garbage is a substance made from a variety of elements, there is a risk that rivers and groundwater will be polluted over time, whether buried as it is or buried by incineration. Furthermore, it is conceivable that toxic substances such as various chemical substances and pesticides, and trash for which infectivity is a problem are mixed in the trash. Looking at the composition of garbage, kitchen garbage (garbage) is the largest,
Paper, plastic, glass, etc. The basics of garbage separation are to separate non-combustible garbage and combustible garbage and incinerate and landfill them to recycle garbage.

[0004] Conventional treatment methods include composting of garbage, and burning of waste plastics, when burning, the temperature inside the incinerator becomes high, which causes problems in the durability of the furnace body and the chimney and generates harmful gas. Landfilled as incombustible waste. Recycling, incineration and landfill can be roughly divided into waste treatment. Of these, recycling is emphasized from the viewpoint of environmental protection, but incineration has been the mainstream until now. Landfilling has no future in Japan, where land is narrow, and landfilling of organic and harmful substances pollutes the soil.

[0005] Incineration treatment has many advantages such as detoxification of harmful substances, prevention of infectious diseases, and large-scale weight reduction in a short time, but it has many problems in environmental preservation, and it is particularly costly in terms of economics. There are drawbacks.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved combustion method for detoxifying and recycling municipal waste. More specifically, the object of the present invention is to
It is to provide a method of burning municipal garbage by completely incinerating the municipal garbage and making incinerated ash that can produce a safe cement-based material without polluting the environment with heavy metals and dioxins in the future. .

[0007]

Means for Solving the Problems The present inventor is characterized in that carbonization is performed on the way to complete incineration to produce a pollution-free stable substance (carbonized) free of harmful substances and heavy metal pollution. A treatment method using a catalytic carbonization plant was developed.

The gist of the present invention is to provide a method of carbonizing city garbage, which is characterized in that municipal garbage, especially garbage, is pulverized into fine powder and then carbonized by carbonization.

Further, the present invention relates to a combustion method for detoxifying and recycling municipal garbage, especially garbage, in a process of carbonizing municipal garbage, especially garbage, to produce carbonized substances on the way to complete incineration. The method is characterized by passing through.

The above-mentioned process is characterized in that municipal garbage, especially garbage, is crushed into fine powder, and then crushed into fine particles of preferably 100 to 150 mesh. In a combustion method for detoxifying and recycling municipal garbage, particularly garbage, municipal garbage, especially garbage, is pulverized into fine powder on the way until complete incineration, and is preferably 100 to 150 mesh. The method is characterized by passing through a step of pulverizing into fine particles and then carbonizing to produce a carbonized substance. Any known method may be employed for the method of complete incineration.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The carbonization treatment step is a carbonization step of maintaining dust at a constant temperature and for a fixed time in a low oxygen state space insulated from the outside air. The garbage can be subjected to a drying treatment step for drying the garbage as needed to reduce the water content.
The refuse that has been dried in some cases is pulverized to be in a fine powder state, and then dry-dried in a low-oxygen space insulated from the outside air at a constant temperature and a constant time.
The drying treatment step and / or the dry distillation treatment step may be accompanied by a smoke exhaust treatment step.

Heating during the carbonization treatment is performed in a temperature range of 100 ° C. to 450 ° C. If necessary, the temperature can be lower than the temperature at which chloride precipitation starts (200 ° C.) or lower than the temperature at which plastic dissolution starts (100 ° C. to 150 ° C.). When the temperature is lower than the temperature at which the chloride contained in the municipal waste precipitates, no chlorine-based gas is generated during the dry distillation treatment, and the plastics soften to serve as a binder, and the handling becomes stable. A solidified product (pellet) mixed with a dechlorinating agent in a shape can be obtained, and since it has been carbonized, a finely powdered solid fuel with good combustion efficiency that can be used as a solidified fuel in the subsequent step can be obtained. . Further, when a complete incineration ash combustion apparatus is used using an apparatus to which a smoke exhaust treatment step is attached in a later step, in the above dry distillation treatment step, the treatment temperature is 200 ° C to 450 ° C.
And maintain the time for 40 to 60 minutes. In the above-mentioned crushing process, crushing is performed to fine particles of 100 to 150 mesh.

Municipal waste subjected to the carbonization treatment can be pulverized into fine powder to increase the surface area, thereby increasing the carbonization speed. First of all, we sort solids, sort iron, etc.
Before being subjected to the carbonization treatment, it is pulverized to a fine powder of 100 to 150 mesh. The carbonization rate in the carbonization furnace is accelerated by pulverizing the carbonization (carbonization) into fine powder.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments. The present invention is not limited by these examples.

Reference Example 1 When the composition of 1,000 g of garbage was examined, kitchen garbage (garbage) 28
5 g, paper 320 g, plastic 160 g, glass 1
20 g and other 115 g. 400 ° C
Was heated in a carbonization furnace for 30 minutes and weighed to 595 g.

Reference Example 2 The same amount of dust was removed of glass and other non-combustible materials, and heated in a carbonizing furnace at 400 ° C. for 30 minutes to obtain 425 g.

Example 1 The same amount of the same dust was removed from glass and other non-combustible materials.
The powder was pulverized to a fine powder and heated in a carbonizing furnace at 400 ° C. for 30 minutes to obtain 320 g.

From the results of Reference Examples 1 and 2 and Example 1, it was found that carbonization was faster when the powder was treated with fine powder except for non-combustible substances.

Example 2 Fine powder dust was sprayed into a drying furnace at a temperature of 400 ° C. with a burner, and was instantaneously burned and carbonized.

[0020]

According to the present invention, an improved combustion method for detoxifying and recycling urban waste can be provided. An improved method of burning municipal garbage to incinerate municipal garbage completely to obtain incinerated ash that can produce safe cement-based materials without polluting the environment with heavy metals and dioxins in the future Can be provided.

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Claims (6)

[Claims] 1. A method for carbonizing urban refuse, comprising crushing municipal garbage into fine powder and carbonizing by carbonization. 2. The method of claim 1, wherein the municipal waste is garbage. 3. A combustion method for detoxifying and recycling municipal garbage, which comprises a step of carbonizing municipal garbage and producing a carbonized substance on the way to complete incineration. 4. The method of claim 1, wherein said step is performed after pulverizing the municipal waste into fine powder.
Combustion method for recycling. 5. In the above-mentioned pulverizing treatment step, 100
The combustion method for detoxifying and recycling municipal refuse according to claim 1, wherein the municipal garbage is pulverized into fine particles of 150 mesh. 6. The method of claim 3, wherein the municipal waste is garbage.