JPH0925489A - Production of solid fuel and solid fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply obtain a solid fuel readily combustible and reducing generation of soot in combustion or corrosion of furnace wall by utilizing an inexpensive and harmless incinerated ash as a calorific power-controlling material and by adding the ash to plastic wastes, blending and heat-melting. SOLUTION: (A) Plastic wastes (e.g. a foamed plastic subjected to the treatment of crushing or compressing) made of polystyrene, polyethylene, polypropylene, etc., are added with (B) incinerated ashes (e.g. ashes generated by burning resultant solid fuel) and blended by a twin extruder, etc., heat-melted, e.g. at a temperature higher than softening point, then shaped. The component B is usually used in an amount of 40-150 pts.wt. based on 100 pts.wt. of the component A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of using plastic waste as a solid fuel and a solid fuel obtained by this method.

[0002]

2. Description of the Related Art Since plastic waste is made of a polymer having a high degree of polymerization, it generates a large amount of heat. For this reason, if it is burned as it is, soot is likely to be generated, and there is a problem that the furnace wall is damaged.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a solid fuel manufacturing method and a method thereof which facilitates the combustion of plastic waste and can effectively utilize the same by utilizing the incineration ash which is also waste. It is intended to provide the obtained solid fuel.

[0004]

In the method of the present invention, incineration ash is added to plastic waste. The type of plastic waste is not limited, but polystyrene, polyethylene, polypropylene, etc. are particularly preferable. The calorific value is about 9,000 to 12,000 kcal / kg. Plastic waste may be kneaded as it is,
The kneading may be performed after a physical or chemical pretreatment such as crushing or volume reduction. Particularly in the case of foamed plastic, it is preferable to reduce the volume in advance. The incineration ash to be added has a calorific value of zero and is added as a calorific value adjusting material. In particular, if the incineration ash generated when the solid fuel obtained by the method of the present invention is incinerated is used, the incineration ash can be effectively used. Further, as other additives, sludge, quick lime, potassium oxide, sodium oxide, sawdust and the like may be further added. Incinerated ash is added to adjust the calorific value, and the amount of addition is determined from the calorific value of the plastic waste and the calorific value of the solid fuel to be obtained. When the incineration ash is about 150 to 40 parts by weight with respect to 100 parts by weight of plastic waste, the calorific value of the solid fuel is 4,000 to 7,
It is better to set it to 000 kcal / kg.

Next, these additives are kneaded and melted by heating. The method of kneading and heating and melting is not particularly limited, but, for example, kneading using a twin-screw extruder, heating and melting, and then shaping. The heating is performed to soften the plastic, and the heating temperature is not lower than the softening point and is usually 180 to 200 ° C. By heating and melting and then cooling, solid fuel in which incinerated ash is uniformly dispersed in plastic waste can be obtained. The solid fuel has a shape that is easy to handle, for example, a pellet shape. The incineration ash added as a calorific value adjusting material by this method is extremely effective as a calorific value adjusting material because it has zero calorific value, is harmless, and has no cost problem.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described according to the plastic fuel conversion flow shown in FIG. First, plastic waste (material: Styrofoam, calorific value:
9,600 kcal / kg) was prepared, and the volume of this was reduced and then pulverized by a pulverizer. Then, plastic waste 1
100 parts by weight of incinerated ash was added to 00 parts by weight, and the additive was put into a twin-screw extruder, melted by heating (heating temperature: 200 ° C.), sufficiently kneaded, and then shaped into pellets to be solid. Fuel (calorific value: 4,800 kcal / kg)
I got

Solid fuel produces incineration ash after combustion, but a part of it is used again for kneading with plastic waste.
The rest is discarded and landfilled. The hot air generated during the burning of the solid fuel is used in the steps of melting, kneading and shaping the kneaded material. In this example, the kneading ratio of the incineration ash added to the plastic waste was set to 1: 1, but this kneading ratio can be adjusted arbitrarily according to the desired calorific value.

[0008]

EFFECTS OF THE INVENTION According to the present invention, when burning a plastic waste that generates a large amount of heat during combustion, it is inexpensive, harmless, and
By using the incineration ash having a calorific value of zero as a calorific value adjusting material, it is possible to easily produce a solid fuel that is easily combusted. Therefore, the amount of waste to be landfilled can be reduced. Also, since it can be used as a heat source, it also helps reduce the use of fossil fuels. Further, the calorific value of the solid fuel can be controlled by adjusting the kneading ratio of the plastic waste.

[Brief description of drawings]

FIG. 1 is a diagram showing a plastic fuel conversion flow according to an embodiment of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirohiro Nakamura 3-2068 Ooka, Numazu City, Shizuoka Prefecture Toshiba Machine Techno Co., Ltd.

Claims (3)

[Claims] 1. A method for producing a solid fuel, comprising: a step of adding incineration ash to a plastic waste; and a step of kneading and heating and melting the additive to obtain a solid fuel. 2. A step of adding incineration ash produced by incinerating the solid fuel obtained by the method of claim 1 to a plastic waste, and a step of kneading and heating and melting the additive to obtain a solid fuel. A method for producing a solid fuel, comprising: 3. A solid fuel obtained by adding incineration ash to plastic, kneading and heating and melting.