JPH01252811A - How to dispose of city garbage - Google Patents

Abstract

PURPOSE:To perform highly efficient melting and disposal of municipal refuse and to reduce an equipment and operation cost, by a method wherein refuse is heated and molten by using plastic in the refuse, serving as a binder, as it is compressed after crushing to form pellets in a simple shape, which is fed to the combustion chamber of a waste melting furnace. CONSTITUTION:After refuse is crushed by a crusher 1, iron cans are separated and removed by means of a magnetic selector 2, and is heated and molten by using plastic contained in the refuse, serving as a binder, as it is compressed by a biaxial extrusion molder 3. The refuse is cut as it is extruded through a dice plate at the tip thereof to form into a pellet-form shape, and is fed to a passage 6, through which a substance to be disposed drops under its own weight, communicated to a combustion chamber 5 of a waste melting furnace 4. In the biaxial extrusion molder 3, heat is generated only by heating the refuse by a heater during the initial stage of operation, and in the following stage, the heat generated by compression is utilized and the plastic in the refuse is molten thereby to perform a role as a binder by means of which the refuse forms pellets. The refuse a moisture content in which is squeezed out form high pellets of high calorific value.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for disposing of municipal waste.

[Conventional technology]

As shown in Figure 2, the conventional treatment method is to incinerate municipal waste into ash in an incinerator (8), and then melt the incinerated ash into slag in a waste melting furnace (4). .

[Problem to be solved by the invention]

However, in order to turn municipal waste into slag, an incinerator (8) and a waste melting furnace (4) are required, which has the disadvantage of requiring a large installation space and high initial cost.

An object of the present invention is to enable municipal waste to be treated with small equipment.

[Means to solve the problem]

The characteristic means of the method for processing municipal waste in the present invention is to crush and compress municipal waste while heating and melting the plastic in the municipal waste as a binder to form a simple shaped pellet into a simple shaped pellet, which is then placed into a combustion chamber in a waste melting furnace. The purpose is to supply the workpiece to the dead weight descending path connected to the workpiece, and its effects are as follows.

[For production]

In other words, municipal waste has a small apparent specific gravity when simply crushed, and has a variety of complex shapes. The melting process is difficult because the bridge phenomenon occurs without descending, making it impossible to supply a constant amount to the combustion chamber, the number of layers, and the introduction of unnecessary outside air into the combustion chamber. By compressing the municipal waste, the apparent specific gravity is increased, and by heating and melting the plastic in the municipal waste as a binder and forming it into simple-shaped pellets, the fluidity in the descending path due to the weight of the material to be processed is increased. Furthermore, sealing performance within the downward path of the weight of the object to be processed can be maintained without introducing unnecessary outside air into the combustion chamber.

〔Effect of the invention〕

Therefore, while maintaining good quantitative supply of the material to be treated into the combustion chamber, the melting process of municipal waste in the waste melting furnace can be easily and efficiently carried out, and the entire municipal waste processing can be carried out. As a result, it is now possible to easily reduce running costs and initial costs by simply installing a device with low equipment and operating costs, without having to install an incinerator.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

General combustible garbage, including food garbage, as municipal waste, has a calorific value of 800 to 2,500 kcal/kg, which is usually about 50% water.As a method for processing this, as shown in Figure 1, a crusher (1) is used. After crushing the municipal waste into pieces of about 400 mm square, iron cans are separated and removed using a magnetic separator (2).
After that, the municipal waste after removing iron cans is processed using a twin-screw compact molding machine (
3) While compressing, heat and melt the plastic, which is present in about 1% of municipal waste, as a binder, and extrude a round rod-shaped product with a diameter of IQmmφ to 3Qmmφ from the die plate at the tip, cutting it into lengths of about 50mm to make pellets. The waste material is then supplied to the dead weight descending path (6) of the material to be treated, which communicates with the combustion chamber (5) in the waste melting furnace (4).

In the twin-screw compact molding machine (3), by simply heating with a heater at the beginning of operation, frictional heat is generated as municipal waste is compressed, and the plastic in the municipal waste is melted by the frictional heat and turned into pellets. It serves as a binder for

As the municipal waste is compressed by the twin-screw compact molding machine (3), the water content of the municipal waste is squeezed out, and the water content is approximately 10% and the amount is 1,500 to 5,000 kcal/kg.
becomes high-calorie pellets, and the squeezed out water is sprayed into the exhaust gas path (7) in the waste melting furnace (4),
The organic content in the moisture is thermally decomposed and the moisture is vaporized, and at the same time the exhaust gas in the exhaust gas path (7) is cooled.

[Another example]

The municipal waste to be processed may be bulky waste with a low moisture content that does not contain food waste, or waste that is unsuitable for incineration and contains a large amount of plastic.

The shape of the pellet may be spherical in addition to the shape of a short round rod, and may be any simple shape.

To pelletize the municipal waste mentioned above, a twin-screw compact molding machine (
In 3), the contained plastic may be melted by constant heating with a heater or the like.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

In the drawings, FIG. 1 is a schematic diagram showing an embodiment of the municipal waste processing method according to the present invention, and FIG. 2 is a schematic diagram showing a conventional processing method. (4)...Waste melting furnace, (5)...
Combustion chamber, (6)... Processing material weight descending path.

Claims (1)

[Claims] Municipal garbage is crushed and then compressed while heating and melting the plastic in the municipal garbage as a binder to form simple shaped pellets. A method for disposing of municipal waste supplied to the descending road (6).