JPS6110798A - Method of washing volume reducer for solid waste - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a method for cleaning a solid waste volume reduction device, and more particularly, the present invention relates to a method for cleaning a solid waste volume reduction device, and in particular, a cleaning method that does not generate excess secondary waste during the cleaning operation, and
The present invention also relates to a simple cleaning method for a solid waste volume reduction device that does not require any incidental equipment.

[Background of the invention] So-called uncombustible garbage, which includes various types of plastics, metals, glass, rubber, etc., discharged from households and factories is disposed of by methods such as incineration, landfill, and resource recovery. However, each of these processes has its own problems. The main causes are often various plastics in the garbage, such as melting during incineration, clogging of the furnace due to adhesion, damage to the furnace due to local heating, and generation of harmful gases such as chlorine and dioxins. In addition, many bulky items, such as styrofoam, polyethylene sheets, and bags, are often disposed of in landfills, which incurs transportation costs, and even after landfilling, they can be exposed from the surface and blown away by the wind, polluting the environment. Recently, various methods for collecting and reusing various plastics have been proposed from the perspective of effective resource utilization.
Municipal waste contains a variety of miscellaneous items, and has the disadvantage that sorting it is rather expensive.

Therefore, we focused on the characteristics of the thermoplastics contained in these municipal wastes and turned them into powdered and granular inorganic materials (
A method has been proposed in which a coarse granular mixed solidified product is obtained by adding sand, crushed stone, incinerated ash, etc. (Japanese Patent Publication No. 57-11273).

In this method, metal pieces, cloth, etc. are not subject to granulation, and processing after separation is required.

On the other hand, during work at nuclear power plants, etc., radioactive materials such as polysheet, paper rags, cloth rags, concrete pieces, steel materials, high-performance filters, and insulation materials are generated, and these are packed in plastic bags and miscellaneous. As a solid, it has been classified into flammable, non-flammable, or unsuitable combustible substances and stored in drums.

For example, wood, filter media (inorganic substances) like high-performance filters.
, it is necessary to dismantle and sort waste that is made up of metal plates, etc., which complicates the process and increases the possibility of workers being exposed to radiation.

These drums have been stored in storage, but the storage space has become smaller than expected, so we decided to incinerate what can be incinerated among these miscellaneous solid wastes, and store the incinerated ash directly in drums or solidify it with cement. etc. It is a more stable solid substance. This incineration process targets bulky items such as polysheets, plastic bags, paper waste, cloth waste, etc., so the volume reduction effect is very large, and nuclear power plants, R1
It has been widely adopted for waste treatment in facilities, etc.

However, incinerating a large amount of plastic may damage the furnace, and the incineration equipment must also be equipped with a waste gas treatment equipment, which also generates secondary waste, which also has the drawback of high equipment costs. .

Another method for treating miscellaneous solid waste is compression and volume reduction using a press, and in particular, a high-pressure compression and volume reduction device with a surface pressure of about 1000 to 3000 (9/csf) is being developed. According to this method, polysheets, plastic bags, paper waste, cloth waste, etc. can be compressed with almost no gaps, and it is an effective method for volume reduction. However, in this method, the obtained compressed body itself is a collection of heterogeneous objects, which is not preferable for long-term storage.
'In order to solve the above-mentioned problems, the present inventors filed a patent application for a solid waste volume reduction device as shown below.

This solid waste volume reduction device houses a rotary shaft equipped with continuous helical blades inside a hollow cylindrical body having a waste input section, an external heating section, and a waste exit section. The upper end side of the rotating shaft is connected to the power unit via a supporting means that allows the shaft to oscillate, and a clearance is provided between the blade and the wall surface of the hollow cylindrical body to allow solid waste to form a bridge. Further, the waste outlet section is provided with a waste outlet nozzle section that enables compression of the solid waste. Here, FIG. 1 shows a schematic diagram of this solid waste volume reduction apparatus. In the figure, 1 is a hollow cylindrical body, 1a
is a waste input part, 1b is an external heating part, 1C is a waste outlet part, 2 is a solid waste, 3 is a blade, 4 is a rotating shaft, 5 is a connector, 6 is a power part, 7 is a free type bearing, 8 is a heating means and 9 is a waste outlet nozzle.

To briefly explain this solid waste volume reduction device, first,
The input solid waste 2 is externally heated 1b by the rotation of continuous helical blades 3 supported by a rotating shaft 4.
gradually transferred in the direction of The clearance between the blades 3 and the inner wall of the hollow cylindrical body 1 is set so that the solid waste 2 forms a bridge, and the solid waste 2 is crushed and pulverized at this rim.

This solid waste volume reduction device has various advantages, such as the ability to significantly reduce the volume of miscellaneous solid waste through single-layer treatment, and the ability to contain hazardous materials such as radioactive materials and heavy metals in plastic. ing.

However, there are still some problems with the volume reduction method using this volume reduction device. The current situation is that a cleaning method suitable for discharging residual solid waste, which becomes an obstacle to volume reduction, out of the volume reduction apparatus has not yet been developed.

As conventional cleaning methods, self-cleaning methods, displacement cleaning methods, solvent cleaning methods, and the like are known.

However, although the self-cleaning method solves the cleaning problem by creating a structure that prevents waste from remaining inside the device, it has the disadvantage that the structure is complicated.

In addition, the displacement cleaning method is a method in which clean material is supplied to the equipment to replace the residue inside the equipment for cleaning, but it has the disadvantage of generating secondary waste, and the solvent cleaning method This is a method of dissolving the residue with an organic solvent or the like to clean the inside of the device, but this method requires a cleaning agent such as an organic solvent, resulting in high costs and complicated operations.

[Object of the Invention] The present invention has been made in order to eliminate the above-mentioned drawbacks in volume reduction of a solid waste volume reduction device, and to eliminate unnecessary secondary cleaning in the cleaning operation of a solid waste volume reduction device. It is an object of the present invention to provide a simple method for cleaning a solid waste volume reduction device that does not generate waste and does not require incidental equipment.

[Structure of the Invention] The method for cleaning a solid waste volume reduction device of the present invention is a method for cleaning the solid waste volume reduction device described above, which comprises cleaning the solid waste volume reduction device. The solid waste remaining inside the hollow cylindrical body of the volume reduction device is pushed out by charging the material into the volume reduction device, and the solid waste is discharged outside the volume reduction device.

In the present invention, target waste or sand to be treated is used as the cleaning material. When using the target waste as a cleaning material, the treated waste that has been subjected to volume reduction treatment before cleaning can be used as the cleaning material as is, which simplifies the cleaning operation and does not require any incidental equipment for cleaning.

In addition, in the present invention, when the target waste is input as a cleaning material, solid waste ( g, below, referred to as residual solid waste) is preferably extruded. That is, if the heating temperature exceeds the melting temperature of the target waste, the residual solid waste cannot be extruded because the viscosity is too small to extrude the residual solid waste. Furthermore, if the temperature is so low that the target waste cannot be brought into a fluidized state, the target waste will not be fluidized and the remaining solid waste cannot be completely discharged. This heating temperature is appropriately windowed depending on the melting temperature of the target waste, but for example, if the melting temperature of the target waste is 190°C, it is preferably 150 to 180°C, and as mentioned above, in any case. It is necessary that the temperature is below the melting temperature of the target waste and above the temperature at which the target waste can be kept in a fluid state.

In other words, when target waste is input under certain temperature conditions, the target waste will be crushed and pulverized, and then become fluid without melting, and will be discharged from the equipment at the same time as the residual solid waste remaining in the equipment. be done. At this time, since the temperature of the remaining solid waste melt has been lowered, it becomes highly viscous and is easily discharged from the apparatus.

In addition, after stopping the input of target waste during this cleaning,
By rotating the blades supported by the rotating shaft for a while, it is possible to more completely eject the remaining solid waste in the device.

Furthermore, the target waste that has been discharged from the residual solid waste inside the device can be assimilated again during normal operation of the device, so secondary waste is not generated when cleaning the inside of the device, and new waste is not generated. No additional equipment is required.

In the present invention, when introducing sand as a cleaning material, it is sufficient to use the temperature at a temperature higher than that at which the solid waste that has been subjected to volume reduction treatment before cleaning can be maintained in a fluid state, and can be used during normal operation without changing the temperature conditions. Since cleaning can be performed under temperature conditions of For example, when the solid residual waste has a melting point of 200°C, the temperature is preferably about 160 to 250°C.

Hereinafter, the method for cleaning a solid waste volume reduction apparatus of the present invention will be explained based on Examples.

・Friend-1-1-1 During the final operation of the solid waste volume reduction device shown in Figure 1, there were 16 volumes of residual solid waste in the hollow cylindrical body. In order to extrude and clean this residual solid waste with target waste,
The temperature inside the hollow cylindrical body was set to 150° C. (below the melting temperature of polyethylene). As a result of inputting 5 pieces of target waste from the waste input section, 20.0fi was discharged from the waste output section.

As a result, the amount of solid waste remaining in the volume reduction device was 1K.
g, and the residual rate in the volume reduction device with this cleaning method is 6
It was found that %.

E-1-1-L When 138 pieces of solid waste were introduced under the conditions that the heating temperature was 250°C and the rotation speed of the rotating shaft was 6 rps, the amount of solidified waste discharged was 122 pieces. Subsequently, 20 kg of heated sand was charged in order to remove the residual solid waste inside the hollow cylindrical body. As a result, a total of 35.68 Kl of residual solid waste and sand was discharged. Therefore, the residual rate in the volume reduction device was 2%.

[Effects of the Invention] As explained above, according to the method for cleaning a volume reduction device of the present invention, since no substance other than target waste or sand is used as a cleaning material in the cleaning operation, the inside of the device can be cleaned. It is possible to completely remove residual solid waste without generating secondary waste, and no new ancillary equipment is required. Therefore, the device can be made inexpensive and the operation can be simplified. In addition, it is possible to solve the problem of reduced volume reduction efficiency caused by adhesion of molten plastic within the device.

[Brief explanation of drawings]

Diagram M1 is a schematic diagram of the solid waste volume reduction device used in the present invention. 1...Hollow cylindrical body, 1a...Waste input part, 1b
...External heating section, 1c, -waste outlet section, 2...
・Solid waste, 3...impeller, 4...rotating shaft,
5... Connector 6... Power unit, 7... Free type bearing, 8... Heating means, 9... Waste outlet nozzle. Patent Applicant: JGC Corporation Patent Applicant: Hiroyo Ogawa Agent Patent Attorney Tatsuo Ito Attorney Patent Attorney Tetsuya Ito Figure 1

Claims (1)

[Scope of Claims] 1. A rotating shaft equipped with continuous spiral blades is housed inside a hollow cylindrical body having a waste input section, an external heating section, and a waste exit section, and an upper end of the rotating shaft. The side is connected to the power unit via a support means capable of pivoting, and a clearance is provided so that solid waste can cause bridging in the gap between the blade and the wall surface of the hollow cylindrical body, and the waste outlet section A method for cleaning a solid waste volume reduction device provided with a waste outlet nozzle portion capable of compressing the solid waste, the method comprising: introducing a cleaning material into the solid waste volume reduction device; By,
A method for cleaning a solid waste volume reduction device, comprising extruding solid waste remaining inside the hollow cylindrical body and discharging the solid waste outside the volume reduction device. 2. The method for cleaning a solid waste volume reduction apparatus according to claim 1, wherein the cleaning material is target waste to be treated. 3. The solid waste according to claim 2, in which the remaining solid waste is extruded at a temperature below the melting humidity of the subject waste and above a temperature at which it can be maintained in a fluid state when the subject waste is inputted. How to clean a volume reduction device. 4. The method for cleaning a solid waste volume reduction apparatus according to claim 1, wherein the cleaning material is sand. 5. When adding the sand, the remaining solid waste is extruded at a temperature higher than that at which the waste, which has been subjected to volume reduction treatment before the washing operation, can be kept in a fluid state. Method for cleaning solid waste volume reduction equipment.