JP2003147377A - Solid fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recycle paper-making refuse generated in a paper-making process and disposed as a waste by converting the refuse to a solid fuel. SOLUTION: The ratio of the solid fuel is set so that paper-making refuse, a waste plastic and waste paper account for 40-60 wt.%, 30-50 wt.% and 5-15 wt.%, respectively. An amount of heat of the solid fuel is regulated by specifying the ratio of paper-making refuse, a waste plastic and waste paper. As the solid fuel is prepared by mixing a waste plastic and waste paper with paper-making refuse generated in a paper-making process, paper-making refuse, which has found no other way for disposal than discarding, can secure a new way for reuse. By adjusting the composition of the solid fuel so that paper-making refuse, a waste plastic and waste paper account for, for example, 50 wt.% (40-60 wt.%), 40 wt.% (30-50 wt.%) and 10 wt.% (5-15 wt.%), respectively, the solid fuel is set to have an amount of heat almost equal to that of coal thereby permitting the solid fuel readily employable for a general boiler and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid fuel for reusing paper dust produced in a paper manufacturing process.

[0002]

2. Description of the Related Art FIGS. 8 (a) and 8 (b) are flow charts showing a processing procedure of a conventional papermaking residue, showing an example of a processing procedure of a conventional papermaking residue. Note that STXXX shows a step number. ST101: The papermaking debris is transported to the incinerator and incinerated in the incinerator. ST102: The residual ash remaining by incinerating the papermaking residue is transported to the disposal site and discarded. That is, conventionally, after the papermaking waste is incinerated in an incinerator, the residual ash is transported to a disposal site and discarded.

[0003]

However, since the residual ash is dumped to the disposal site after incineration in the incinerator, the cost of treating the papermaking waste increases. In other words, the only way to dispose of paper dust is to discard it. Therefore, a method for effectively reusing the papermaking residue is desired in order to reduce the amount of the papermaking residue to be discarded.

An object of the present invention is to make a solid fuel by using papermaking waste to open the way for reuse of papermaking waste that could only be disposed of.

[0005]

In order to solve the above-mentioned problems, the solid fuel according to claim 1 is formed by mixing waste plastic and waste paper with the papermaking residue generated in the papermaking process. After incineration in an incinerator, it is preferable to open the way for the reuse of papermaking debris that is often transported to the disposal site as residual ash and discarded. Therefore, solid waste was made by mixing waste plastic and waste paper with the papermaking residue.
This will open the way for the reuse of paper waste that could only be disposed of.

According to a second aspect, the papermaking residue has a water content of 40 to 6
It is characterized in that it contains 0%. Generally, it is known that paper dust contains 90% or more of water. If the water content of the papermaking residue exceeds 60%, the papermaking residue is in the form of gel and is difficult to handle. Also, the water content of the papermaking residue is 40%.
There is a cost to falling below. Therefore, by using a papermaking residue having a water content of 40 to 60%, the workability in production and the material cost are balanced. As a result, a good and inexpensive solid fuel can be provided.

A third aspect of the present invention is characterized in that the papermaking dregs, the waste plastic and the waste paper are blended in a proportion of 40 to 60% by weight of the papermaking dregs, 30 to 50% by weight of the waste plastic and 5 to 15% by weight of the waste paper. The calorific value of solid fuel is adjusted by setting the composition of papermaking waste, waste plastic and waste paper. For example, by setting the papermaking waste to 50% by weight (40 to 60% by weight), the waste plastic to 40 (30 to 50% by weight) and the waste paper to 10% by weight (5 to 15% by weight), the solid fuel can be reduced. Set the calorific value to the level of coal so that it can be easily used in general boilers. As a result, it is possible to provide a solid fuel having a calorific value that is generally easy to use.

According to a fourth aspect, the particle size of the solid fuel is
It is characterized by being a piece having one side or a diameter of 8 to 50 mm. By making the solid fuel into pieces with one side or a diameter of 8 to 50 mm, combustion efficiency is improved and stable heat is obtained at high temperatures. That is, if one side or diameter is less than 8 mm, it is difficult to burn. Further, if the side or the diameter exceeds 50 mm, the amount of solid fuel that can be put into a certain space decreases.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a flow chart showing a method for producing a solid fuel according to the present invention. Note that STXX indicates a step number. ST01: (Drying Step) It is generally known that the papermaking residue contains 90% or more of water. Water content of papermaking residue is 6
If it exceeds 0%, the papermaking residue is gel-like and difficult to handle. Therefore, it is dried to 40 to 60% of the water content of the papermaking residue. Here, the papermaking waste refers to waste discharged in the papermaking process.

That is, the papermaking residue has a water content of 40 to 60.
It can be said that the one containing% is used. Generally, it is known that paper dust contains 90% or more of water. If the water content of the papermaking residue exceeds 60%, the papermaking residue is in the form of gel and is difficult to handle. In addition, it is costly to keep the water content of the papermaking residue below 40%. Therefore, the water content of 40-
By using 60% papermaking residue, workability in production and material cost are balanced. As a result, a good and inexpensive solid fuel can be provided.

ST02: (Mixing step) 40 to 6 of water content
Mix 0% papermaking waste, waste plastic and waste paper in the given weights. For example, 50% by weight of papermaking debris (40-6
0% by weight), 40% by weight of waste plastic (30-50%)
%) And waste paper at 10% by weight (5-15% by weight). Here, the waste plastic is preferably a thermoplastic waste plastic. The thermoplastic waste plastic is solid at room temperature, but melts and softens when heat is applied to become a fluid, and when it cools, solidifies and becomes solid. Examples of such materials include polyethylene, polystyrene, polypropylene, etc., and include, for example, paper diapers, milk pack film, etc. (hereinafter, waste plastic refers to thermoplastic waste plastic). Typical examples of used paper include cardboard, old paper such as magazines and old newspapers, and laminated paper.

That is, it can be said that the solid fuel is a mixture of papermaking waste, waste plastic and waste paper in a proportion of 40 to 60% by weight of wastepaper, 30 to 50% by weight of waste plastic, and 5 to 15% by weight of waste paper. The calorific value of solid fuel is adjusted by setting the composition of papermaking waste, waste plastic and waste paper. For example, 50% by weight of papermaking debris (40-6
0% by weight), 40 (30 to 50% by weight) of waste plastic and 10% by weight (5 to 15% by weight) of waste paper to set the solid fuel to a calorific value equivalent to that of coal, and to a general boiler, etc. Use a heat quantity that is easy to use. As a result, it is possible to provide a solid fuel having a calorific value that is generally easy to use.

ST03: (Crushing step) 10 to 100 of papermaking waste, waste plastic and waste paper mixed in a predetermined weight
Crush into a size of mm to produce fuel pellets. This is because if the size of the fuel pellets exceeds 100 mm, the granulation of the pieces is affected, and it becomes difficult to manufacture pieces of 8 to 50 mm. Therefore, the smaller the fuel pellet size is, the better it is. However, the smaller the cost, the higher the manufacturing cost. 10-100
It may be crushed to a size of mm, preferably 40 mm
The degree.

ST04: (Compression step) The obtained fuel pellets are compressed until the waste plastic is softened. When waste plastic is compressed under high pressure, frictional heat is generated, and this heat softens and makes viscosity, and therefore, it is presumed that an adhesive action occurs and it serves as a binder for solid fuel. In particular, when the fuel pellets are extruded through a die hole, which will be described later, a large frictional heat is generated due to the extrusion resistance of the die hole. Further, the used paper has a function of strengthening the stiffness of solid fuel due to its fiber.

ST05: (Particle sizing step) The obtained compressed product is made into pieces each having one side or a diameter of 8 to 50 mm. If the size of the piece is less than 8 mm, the piece is likely to be powdered, the combustion efficiency is reduced, and the amount of residual ash is increased. If the size of the piece exceeds 50 mm, the amount of pieces that can be put in the same area is reduced and the space efficiency is lowered. Therefore, the size of the piece is set to a piece having one side or a diameter of 8 to 50 mm to improve combustion efficiency and obtain stable heat at high temperature.

That is, it can be said that the solid fuel is formed by mixing waste plastic and waste paper with the papermaking residue generated in the papermaking process. After incineration in an incinerator, it is preferable to open the way for the reuse of papermaking debris that is often transported to the disposal site as residual ash and discarded. Therefore, solid waste was made by mixing waste plastic and waste paper with the papermaking residue. This will open the way for the reuse of paper waste that could only be disposed of.

2 (a) and 2 (b) are explanatory views of the solid fuel according to the present invention. FIG. 2 (a) shows the front shape of one piece of the solid fuel 10, and FIG. Shows the allocation table. In (a), the solid fuel 10 is formed by mixing waste plastic and waste paper with paper dust generated in the paper manufacturing process, and one side L (or diameter) is 8 to 5
It is a 0 mm piece 14. Solid fuel 10 has a side L
By making the piece 14 (or diameter) 8 to 50 mm, the combustion efficiency is improved and stable heat is obtained at high temperature. Here, the solid fuel 10 alone is replaced by the piece 14
And the assembly of these pieces 14 is called the solid fuel 10.

In (b), the amount of heat of the solid fuel 10 is adjusted by setting the composition of the papermaking residue, the thermoplastic waste plastic, and the waste paper. The amount of heat of papermaking waste is 2900 kc
When al / kg, the heat quantity of waste plastic is 9000 kcal / kg, and the heat quantity of waste paper is 3000 kcal / kg, for example, if 50% by weight of paper waste, 40% by weight of waste plastic and 10% by weight of waste paper are mixed, About calorie 5000 kcal / kg
Solid fuel (calculated 5350 kcal / kg) can be made. That is, the heat quantity of coal (the heat quantity of coal: 4
The solid fuel 10 of 500 to 7500 kcal / kg) can be produced, and the heat amount of the fuel can be easily used in a general boiler or the like. Naturally, the amount of heat can be adjusted by changing the mixing of waste plastic and waste paper. Therefore, it is safe to appropriately change the mixing ratio.

FIG. 3 is a principle view of a drying device suitable for producing the solid fuel according to the present invention. The drying device 20 includes a housing 21, a door 22 that is openably and closably attached to the housing 21, and the inside of the housing 21. Heater 23 placed in
And a net 24 attached above the heater 23
An exhaust pipe 25 attached to the upper part of the housing 21, an exhaust valve 26 attached in the middle of the exhaust pipe 25, and an exhaust pipe 2
The electric furnace is composed of a deodorizing / catalyst unit 27 attached to No. 5 and an agitator 28 for agitating paper dust. 5
0 indicates a papermaking residue.

FIG. 4 is a principle diagram of a crushing apparatus suitable for producing a solid fuel according to the present invention. The crushing apparatus 30 is for crushing paper waste (water content 40-60%), waste plastic and waste paper. It is a device in which the mixture 11 is cut by the fixed blade 32 and the rotary blade 33 and dropped through a screen 34 of 10 to 100 mm. The size of the fuel pellets 12 can be changed by changing the screen 34. A pusher 35 serves to push out the mixture 11 according to the rotation speed of the rotary blade 33. 36 is a discharge conveyor. The crushing device 30 is used to mix the mixture 11 from 10 to 10
It can be a 0 mm fuel pellet 12. In addition,
The structure of the crushing device 30 is an example, and is 10 to 1
Other structures may be used as long as the fuel pellets 12 of 00 mm can be obtained.

FIG. 5 is a principle diagram of a compression / sieving apparatus suitable for producing a solid fuel according to the present invention. The compression / sieving apparatus 40 as a compression apparatus and a sizing apparatus uses a rotary drum for the fuel pellets 12. A loading duct 42 to be loaded into the die 41,
Rollers 43 and 44 that support and rotate the die 41
, A large number of die holes 45 opened in the die 41 ... , The fuel pellets 12 introduced into the die 41 through the introduction duct 42 are strongly pressed by the rollers 43, and as a result, the die holes 45 ...
Enter. After that, by cutting with the cutter 46, the pieces 14 ... This action is difficult to understand, and will be described in detail in the next figure.

FIG. 6 is a diagram showing the working principle of the compression / sieving apparatus suitable for producing the solid fuel according to the present invention. For the sake of convenience, the cylindrical die 41 is expanded into a flat plate shape. The die hole 45 contains the previous fuel pellets 12, into which the roller 4
When another fuel pellet 12 is pushed in at 3, the compressed fuel pellet 12A is extruded from the die 41 by an amount corresponding to the thickness of the die 41 like “Tokoroden”. Therefore, if the compressed fuel pellets 12A thus squeezed out are cut by the cutter 46, the pieces 14 having a constant diameter and a constant length can be cut out.

The operation of the solid fuel 10 described above will be described below. 7 (a) to 7 (c) are explanatory views of the action of the solid fuel according to the present invention, (a) shows an embodiment, (b),
(C) shows a comparative example. In (a), the solid fuel 10 of the example is a piece 14 having one side L (or diameter) of 8 to 50 mm. Therefore, a space S ... With an appropriate size can be provided between the pieces 14, so that the combustion efficiency can be improved and stable heat can be obtained at a high temperature.

In (b), the solid fuel 100 of the comparative example is used.
Is a piece 104 whose one side or diameter is less than 8 mm ...
It is possible to take only a narrow space S1 ... Between the solid fuels 100. Therefore, a large amount of residual ash is generated and the combustion efficiency is poor. In (c), the solid fuel 110 of the comparative example is
Since the pieces 114 have one side or a diameter exceeding 50 mm, the number of pieces that can be put into a certain space is reduced. That is, the space factor of the solid fuel 110 deteriorates.

In the embodiment, as shown in FIG. 1, the water content of the papermaking dregs is dried to 40 to 60% in the drying step. However, the present invention is not limited to this, and the water content is 40% by omitting the drying step. It is also possible to directly use ~ 60% of papermaking residue. Further, in the embodiment, as shown in FIG. 1, the production of the solid fuel is performed by the compression / sieving apparatus simultaneously with the compression process and the sizing process. However, the present invention is not limited to this, and the compression device and the sizing process are not limited to this. The granulating apparatus may be separately provided and the compression step and the sizing step may be separately performed.

[0026]

The present invention has the following effects due to the above configuration. In the claims, since the solid fuel is formed by mixing the waste plastic and the waste paper with the papermaking waste generated in the papermaking process, it is possible to open the way to reuse the papermaking waste that can only be disposed of.

In general, it is known that papermaking dregs have a water content of 90% or more. If the water content of the papermaking residue exceeds 60%, the papermaking residue is in the form of gel and is difficult to handle. In addition, it is costly to keep the water content of the papermaking residue below 40%. According to the second aspect, since the papermaking residue containing 40 to 60% of water is used, workability in manufacturing and material cost can be balanced. As a result, a good and inexpensive solid fuel can be provided.

According to a third aspect of the present invention, the papermaking residue, the waste plastic and the waste paper are 40% to 60% of the papermaking residue and the waste plastic 30.
Since the blending ratio is -50% and recycled paper 5-15%, it is possible to set the solid fuel to a calorific value similar to that of coal and to make the calorific value easy to use in a general boiler or the like. As a result, it is possible to provide a solid fuel having a calorific value that is generally easy to use.

According to a fourth aspect of the invention, the particle size of the solid fuel is
Since a piece having one side or a diameter of 8 to 50 mm is used, combustion efficiency can be improved and stable heat can be obtained at high temperature. That is, if one side or diameter is less than 8 mm, it is difficult to burn. Further, it is based on the fact that when the one side or the diameter exceeds 50 mm, the amount of solid fuel that can be put into a certain space decreases.

[Brief description of drawings]

FIG. 1 is a flow chart showing a method for producing a solid fuel according to the present invention.

FIG. 2 is an explanatory diagram of a solid fuel according to the present invention.

FIG. 3 is a principle diagram of a drying device suitable for producing a solid fuel according to the present invention.

FIG. 4 is a principle diagram of a crushing apparatus suitable for producing a solid fuel according to the present invention.

FIG. 5: Principle diagram of a compression / size controller suitable for producing solid fuel according to the present invention

FIG. 6 is a diagram showing the principle of operation of a compression / sizing apparatus suitable for producing a solid fuel according to the present invention.

FIG. 7 is an explanatory view of the action of the solid fuel according to the present invention.

FIG. 8 is a flowchart showing a processing procedure for conventional papermaking residue.

[Explanation of symbols]

10 ... Solid fuel, 11 ... Mixture, 12 ... Fuel pellet,
14 ... Piece, 20 ... Drying device, 30 ... Crushing device, 40
... Compressor and sizing device (compression / sizing device).

Claims (4)

[Claims] 1. A solid fuel formed by mixing waste plastic and waste paper with papermaking waste generated in the papermaking process. 2. The papermaking residue has a water content of 40 to 60%.
The solid fuel according to claim 1, wherein the solid fuel is contained. 3. The papermaking residue, waste plastic and waste paper are 40% to 60% by weight of papermaking residue and 30% of waste plastic.
The solid fuel according to claim 1 or 2, wherein the solid fuel is blended in a ratio of 50% by weight and 5 to 15% by weight of waste paper. 4. The solid fuel according to claim 1, wherein the particle size of the solid fuel is a piece whose one side or diameter is 8 to 50 mm.