JPH10244176A - Operation of roller mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of operation of a roller with which organic wastes are safely crushed after they are heat treated. SOLUTION: A motor 1 rotates a vertical shaft 2, and a material to be pulverized 28 is fed between a table 3 and a roller 5 and is classified by a separator 6 as a crushed material 29 before feeding to a boiler 9. Organic waste 21 is thrown in a rotary kiln 12 having a jacket 11, and oil 22 and combustion air 23 are fed to the jacket 11, and the organic waste 21 is heated at 200∼500 deg.C in an oxygen shortage state to thermally decompose it into volatile gas 24 and a residue 25. The gas 24 is fed to the boiler, and the residue 25 is fed to a mill through a feeding pipe 4 together with coal 26, if necessary and is crushed. The residue 25 consists essentially of carbon and is fragile and is easily crushed and is also thermally stable and is not ignited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to urban refuse, RDF
(Refuse Derive Fuel; solid waste fuel from municipal solid waste), waste plastics, etc. are crushed and used for co-firing in a conventional coal-fired power plant. Roller mill for crushing the crushed material alone or mixed with coal Related to the driving method.

[0002]

2. Description of the Related Art FIG. 3 is a general configuration diagram of a conventional roller mill. In the figure, an upper supply pipe 4 is provided on a table 3 rotated by a vertical shaft 2 driven by a motor 1.
The crushed object 8, for example, coal is charged, and the crushed object 8 on the table 3 is crushed by a plurality of rollers 5 that press and roll on the table 3. Table 3 and roller 5
The pulverized material 8 pulverized in between is dried and conveyed by hot air 7 supplied from the lower part of the table 3 and blowing up from the surroundings.
The material to be crushed having a predetermined particle size is conveyed to the boiler 9 by passing through the separator 6, and the coarse particles fall again on the table 3 and are crushed again.

The conventional general roller mill described above cannot pulverize organic wastes which are soft and hard to pulverize except for coal and ore. In addition, in the case of pulverization by means other than a roller mill, frozen pulverization using liquid nitrogen is performed on plastics and the like, but it is a special pulverization method, which is expensive and not suitable for large-scale pulverization. It is.

[0004]

However, there are the following problems when pulverizing organic waste with the above-mentioned conventional roller mill.

(1) The crushing mechanism of the roller mill is compression and shearing. However, soft and ductile materials such as plastics are only flattened, and are not discharged from the roller mill because they are not sheared, and are accumulated inside. Eventually, the operation of the mill becomes impossible.

(2) In particular, when mixed with coal and pulverized, hot air of about 200 ° C. is used. However, when the ignition temperature of organic waste is low, it is ignited in a mill and a flame is generated. Might be.

According to the present invention, in order to solve the above problems (1) and (2), it is possible to pulverize organic waste and mix with coal and the like without igniting inside the mill. An object of the present invention is to provide a roller mill operation method that enables safe operation.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a table rotated by a motor about a vertical axis.
A plurality of rollers that roll while pressing on the same table, and a method of operating a roller mill that crushes an object to be crushed between the roller and the table, wherein a soft organic material that is hard to be crushed as the object to be crushed. A method for operating a roller mill, comprising: subjecting a waste to heat treatment in advance in an oxygen-deficient atmosphere in a temperature range of 200 to 500 ° C., and thereafter throwing the waste on the table in a roller mill and pulverizing the waste.

In the method for operating a roller mill of the present invention, by heating an organic waste such as a plastic in an oxygen-free atmosphere, thermal decomposition as shown in the following equation (1) or (2) occurs. .

[0010]

Embedded image

Cα′H in the above equations (1) and (2)
α ′ is a low molecular hydrocarbon, which is released from the organic waste as a gas, that is, a volatile gas together with CO, H ₂ O, etc., and the organic waste becomes a residue mainly composed of carbon C.
The residue mainly composed of carbon is brittle and easily pulverized in a roller mill, and is thermally stable and does not ignite.

The operation method of the above roller mill will be described with reference to the basic configuration diagram of the roller mill of the present invention shown in FIG. 1. The organic waste A is put into, for example, a heating device B, where it is heated in an oxygen-deficient atmosphere. Is thermally decomposed into volatile gases and residues as described above. The volatile gas is sent, for example, to a boiler or the like as it is, and can be used for combustion. Since the residue is easily pulverized with carbon as a main component, it is put into a roller mill D, and becomes a material D-4 to be pulverized. -3. The loaded residue, that is, the material to be ground D-4 is rotated by a motor D-1 and a vertical axis D-2.
Crushed between the roller 3 and the roller D-5, and supplied to the boiler by hot air from below. At this time, the residue can be mixed with coal C and fed to roller mill D as needed.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing a basic configuration of the present invention, which has been described in the section of the above-mentioned means, and a description thereof will be omitted. FIG. 2 is a configuration diagram of an apparatus for performing the roller mill operation method according to one embodiment of the present invention, and embodies the basic configuration of the present invention shown in FIG. 1 described above. FIG. 2 shows an embodiment of the present invention.
This will be described below.

In FIG. 2, a roller mill 10 is a motor 1
A table 3 that rotates around the driven vertical axis 2, a supply pipe 4 that supplies the material to be ground 28, a plurality of rollers 5 that roll while pressing on the table 3, and an upper separator 6. ing.

Further, the pulverized material from the roller mill 10 is sent to the boiler 9 for combustion, the organic waste 21 is heated, and the jacket 1 is decomposed into volatile gas 24 and residue 25.
1 is provided with a rotary kiln 12.

An operation method of the above-described apparatus configuration will be described. First, the crushed material 28 supplied from the supply pipe 4
Is pressed between the table 3 and the roller 5 to be pulverized into a pulverized object 29, which is supplied from a lower portion of the table 3 and blows up from the periphery of the table 3.
Is dried and conveyed, passes through the upper separator 6,
Classified and supplied to the boiler 9. Among the materials classified by the separator 6, coarse particles fall again on the table 3,
Re-crushed.

In the operation method according to the present embodiment, the organic waste 21, for example, plastic,
1 into a rotary kiln 12 and internally 20
It is heated for 30 minutes or more in the temperature range of 0 ° C to 500 ° C,
In this example, heating is performed at 300 ° C. for about 1 hour.

That is, oil 22 and combustion air 23 are supplied to the jacket 11, and the oil 22 and combustion air 23 are burned to heat the organic waste 21. The organic waste 21 is heated in an oxygen-deficient state inside and is thermally decomposed to separate into a volatile gas 24 mainly composed of low molecular hydrocarbons and a residue 25 mainly composed of carbon.

The generated volatile gas 24 is supplied to the boiler 9 together with CO, H ₂ O, etc., and is subjected to combustion, and the residue 25
Is fed into the roller mill 10 from the supply pipe 4 together with the coal 26 as necessary, and is supplied to the boiler 9 after being finely pulverized by the roller mill 10 as described above.

According to the operation method of the roller mill according to the above-described embodiment, the organic waste 21 is heated in the oxygen-deficient atmosphere by the rotary kiln 12 and decomposed into volatile gas 24 and residue 25 by thermal decomposition. The neutral gas 24 is directly sent to the boiler 9, and the residue 25 is easily crushed by the roller mill 10 because it is brittle, mainly composed of carbon, and is thermally stable and 300 ° C.
It is possible to safely pulverize with the roller mill 10 without causing any ignition.

[0021]

As described above, the method for operating the roller mill according to the present invention comprises a table rotating around a vertical axis by a motor, and a plurality of rollers rolling while pressing on the table. A roller mill operating method for crushing an object to be crushed between the roller and the table, comprising: a soft organic waste which is hard to be crushed as the object to be crushed;
Heat treatment in the temperature range of, and then thrown on the table in the roller mill and pulverized, so that organic waste is separated into volatile gas and residue by thermal decomposition, and the volatile gas remains as it is. The residue can be supplied to a boiler or the like, and the residue is brittle with carbon as a main component and can be easily pulverized. Therefore, this residue can be easily pulverized in a roller mill and supplied to a boiler or the like, and since this residue is also thermally stable and has no risk of ignition, it is possible to safely pulverize organic waste with a roller mill. became.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus to which a method for operating a roller mill according to the present invention is applied.

FIG. 2 is a configuration diagram of an apparatus to which a method for operating a roller mill according to an embodiment of the present invention is applied.

FIG. 3 is a configuration diagram of a conventional roller mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Vertical axis 3 Table 4 Supply pipe 5 Roller 6 Separator 9 Boiler 10 Roller mill 11 Jacket 12 Rotary kiln 21 Organic waste 22 Oil 23 Combustion air 24 Volatile gas 25 Residue 26 Coal 27 Hot air 28 Pulverized material

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shuichi Sakota 1-1, Akunouramachi, Nagasaki City Inside Nagasaki Shipyard, Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] 1. A table which rotates around a vertical axis by a motor, and a plurality of rollers which roll while pressing on the table, and crush the object to be crushed between the rollers and the table. In the operation method of the roller mill, the soft organic waste that is hard to be pulverized as the object to be pulverized is heat-treated in advance in an oxygen-deficient atmosphere at a temperature in the range of 200 to 500 ° C., and then put on the table in the roller mill and pulverized. A method for operating a roller mill.