JPS60112892A - Process for producing solid fuel from industrial waste - Google Patents

Abstract

PURPOSE:To obtain a solid fuel for e.g. boiler, etc. from an industrial waste, by dehydrating a main raw material such as pulp sludge, and mixing and kneading the product with the subsidiary material such as kneaded and crushed waste of petroleum refining process having relatively high calorific value. CONSTITUTION:A main raw material composed of the sludge of pulp and paper industry containing organic components such as cellulose, lignin, etc. and optionally mixed with other sludge or sewage sludge such as municipal waste containing other organic components, is preliminarily dehydrated, and subjected to the main dehydration optionally in the presence of a dehydration assistant. Separately, the subsidiary raw material composed of the waste of petroleum refining process, combustible municipal waste, waste oil, waste organic solvent, vehicle, etc. is kneaded and crushed, and the product is mixed and kneaded with the above main raw material to obtain the objective solid fuel.

Description

[Detailed Description of the Invention] This invention relates to a method for producing solid fuel from industrial waste, and its purpose is to utilize industrial waste (flammable solid content),
The object of the present invention is to provide a method for producing solid fuel from industrial waste, which can be recycled as fuel for combustion furnaces and the like.

Generally, sludge discharged from pulp and paper mills contains flammable solids such as cellulose and lignin, but it is difficult to incinerate this because of its high moisture content.

This invention was made in view of the above-mentioned circumstances, and is applicable to pulp containing organic matter such as cellulose 5 lignin, sludge such as paper manufacturing sludge and municipal waste containing other organic matter, raw urine sludge, and even industrial waste containing organic solvents. It was invented to eliminate waste disposal such as landfilling, incineration, and ocean dumping by treating waste at the place where it is discharged and reusing it as fuel, thereby helping to secure energy sources. The present invention relates to a method for producing solid fuel from industrial waste.

This invention will be explained in detail below based on the drawings.

FIG. 1 shows a flow sheet of a typical embodiment of the present invention, and FIG. 2 is a schematic cross-sectional explanatory diagram of FIG. 1.

In the drawings, (1) is pulp or papermaking sludge containing organic substances such as cellulose and lignin as main raw materials, and may also be sludge such as municipal waste containing other organic substances, or deep bed sludge.

This main raw material (1) has a water content of 80% or more.

(2) is a dehydration treatment step as a pretreatment.

In this dehydration treatment step (2), the water content of the main raw material is treated to decrease by at least 10%, but for valves and papermaking sludge with low viscosity, the water content is about 30%, which indicates the addition process of a dehydration aid. .

(4) is the main dehydration process, and in this dehydration process, the water content is reliably reduced to about 50% regardless of the type of main raw material (1).

(5) is a wastewater treatment step for treating the wastewater discharged from this dehydration treatment step (4).

(6) is an auxiliary raw material, and this auxiliary raw material (6) is petroleum refinery residue,
It consists of combustible municipal waste, waste oil, waste organic solvents, and even vehicles.

(7) is a kneading and crushing process for the auxiliary raw material (6), in which the auxiliary raw material (6) consisting of the petroleum refinery scum, combustible municipal waste, waste oil, waste organic solvent, and even a vehicle is mixed. .

(8) does not include the kneading step of kneading the auxiliary raw material (6) mixed with the main raw material (1) whose water content has been reduced to at least about 50%.

In the extruded product that has undergone the kneading step (8) in this way, the water contained in the raw material itself has a function as a binder, and if necessary, the kneading and crushing step of the auxiliary raw material (6) (
The vehicle supplied from 7) becomes a shaped solid fuel (9).

This solid fuel (9) has at least 300 (Mca I
/ Transfer Kg.

The solid fuel (9) produced in this way is either temporarily stored in a warehouse 00) or immediately supplied to a combustion device 11) such as a boiler.

The method for producing solid fuel from industrial waste according to the present invention having such a configuration will be further explained based on FIG. tJ, 1l (13) (for example, screw press in the figure) to remove water to about 35-40%
A paper sludge cake of (weight) below +11 is prepared, and this is put into the service hopper (14).

On the other hand, the distillation residue (15) of waste ink containing vehicle, solvent, oil, etc. discharged from the printing factory was previously put into the service hopper (16), and the paper manufacturing sludge cake (15) stored in the service hopper (14) ) and the distillation residue (15
) are discharged by screw feeders (1?) and (18) adjusted to have a discharge weight and quantity ratio of 10:1 to 5:1, and are combined on a screw conveyor (19).

This confluence is the outlet of the screw conhair (19) (
20) into the kneading machine (21), and the kneading machine (21)
The sludge cake [11] and the distillation residue (15) are sufficiently kneaded while being transferred from the input port (22) side to the discharge port (23) side.

The flaky solid fuel (9) falls from the discharge port (23) onto the heald conveyor (24) and is conveyed to the belt conveyor (24).
During the kneading process, when the materials to be kneaded are transported out and stored in the storage container (25), if the materials to be kneaded have thorns, this odor can be removed by continuously adding a suitable deodorizing agent at the same time as the kneading. This is desirable because it eases the problem and makes the work easier.

The above papermaking sludge (1) generally contains about 60% or more water (by weight) and has a calorific value of about 1,500 Kcal/kg or less, but after dehydration it has a calorific value of 1,800 to 24,000 Kcal/kg or less.
K ca 1/kg.

On the other hand, the distillation residue contains about 10% (f
The calorific value is 6300-7800Kc.
a It is 17 kg.

This is a residue obtained by distilling organic solvents from waste ink discharged from printing factories, and has traditionally been disposed of by incineration.

The calorific value of the solid fuel (9) thus obtained was approximately 3500 to 450'OKcal 7 kg.

In addition, in the above example, paper manufacturing sludge and waste ink were used as two types of industrial waste, but this is not limited to wastes with a relatively low calorific value. By mixing it with waste that has a calorific value, it can be recycled as solid fuel for boilers, etc.

As explained in detail above, the method for producing solid fuel from industrial waste according to the present invention allows two types of combustible industrial waste to be made into useful solid fuel very easily, and it is possible to convert the two types of combustible industrial waste into useful solid fuel, and it Since waste such as paper sludge, which had previously been used as paper manufacturing sludge, can be turned into solid fuel at the place where it is generated, there is no need to secure a place for dumping it, and there is no need for labor to transport it. An energy source is produced, and wastes with a relatively high calorific value, which have conventionally been incinerated, can be effectively utilized as described above.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet diagram of a method for producing solid fuel from industrial waste according to the present invention, and FIG. 2 is an explanatory diagram thereof. +1) - Main raw material (2) - Dehydration process (pretreatment) (31-
Dehydration aid addition step (41-raw dehydration step (61-auxiliary raw material (7)-kneading crushing step f8)-kneading step (9)--solid fuel

Claims (1)

[Claims] (1) Two types of industrial waste, the main raw material and the auxiliary raw material, are used, and pulp and paper sludge containing organic substances such as cellulose and lignin are used. In some cases, sludge such as municipal waste containing other organic substances, or deep A step in which the main raw material such as bed sludge is first dehydrated as a pre-treatment, a step in which a dehydration aid is added to the step in which the main raw material is dehydrated as a pre-treatment if necessary, and then the main dewatering step Parallel to the process of processing these main raw materials, there is a process of kneading and crushing auxiliary raw materials such as petroleum refinery scum, combustible municipal waste, waste oil, waste organic solvents, and even vehicles. A method for producing solid fuel from industrial waste, comprising a step of mixing and kneading an auxiliary raw material and a main raw material that has undergone the dehydration treatment process.