JPS5843436B2 - Method for producing pellet fuel using waste paper as raw material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for producing fuel using waste paper such as newspaper, various printing papers, packaging paper, miscellaneous paper, etc. as a raw material and treating it with alkali to form pellets.

Conventionally, pelletized fuel using waste paper as a raw material has been produced, and the manufacturing method is generally as follows.

First, waste paper, which is a raw material, is crushed using a crusher, water and H2SO4 are added to it, and it is stirred to form a slurry. Next, it is passed through a centrifuge to remove excess water, and then a coagulant such as cement is added to it in a kneader. The mixture is then kneaded and then transferred to a granulator to form spherical pellets of an appropriate size.

As mentioned above, the characteristic of the conventional method is that about 5 times the amount of water and about 0.1% (by weight) of H2SO4 are added to the raw materials in a stirrer.

For this reason, cellulose, which is a component of paper, is not sufficiently dissolved, and organic substances such as lignin and tannin are pelletized without being separated, so it is inevitable that a large amount of oil smoke will be generated when the product is burned.

Furthermore, in the conventional method, about 10% of a coagulant such as cement is mixed and used during pelletization.

For this reason, it is easy to form pellets, but the thermal efficiency is inferior by the amount equivalent to the coagulant, and the ash content increases, making the product heavier.

Therefore, there are many problems in terms of profitability.

Therefore, the present inventor developed the following manufacturing method and conducted experiments, which yielded excellent results.

That is, the present invention is a manufacturing method in which waste paper is crushed in a crusher, water and alkali are added in a stirrer, the mixture is kneaded, and the paper is pelletized in a granulator.

The alkali in the present invention includes NaOH as well as Na2 co
Even if 3 is used, almost the same effect can be obtained.

Cellulose is easily dissolved by this alkaline solution and lignin etc. are also eluted, so cellulose is broken down into pieces. At the same time, the lignin present in the cell membrane acts to bond the fibers together, and tannin is a water-soluble polyhydric phenol and has an astringent effect. There is sex.

All of these actions play the role of a binder in the granulation process.

In the present invention, the paper fibers are made into pellets without using any coagulants such as cement, and there is no need to use a centrifuge.

In general, alkali has a higher penetrability into the paper composition than acid, so the synergistic effect of the above-mentioned lignin, tannin, etc. has effects such as neutralization, solubility, and adhesion, making granulation easier. At the same time, it is also very effective in maintaining the shape of molded products.

Example Old newspaper was crushed into pieces of about 5 mm in size using a crusher, transferred to a stirrer, added with water three times the amount of the raw material, and further added with 1.0% NaOH based on the raw material (weight) and kneaded. It became muddy.

Next, this slurry was passed through a granulator to form pellets with a diameter of 20 mx.

The pellets were completely dried after being left for a day and night, so they were used as fuel.

As a result, the pellet fuel according to the present invention, which has been proven to have good thermal efficiency and has an extremely low ash content, has a high calorie, is easy to handle, can be provided at low cost, and generates very little pollution when burned. It is highly effective as an energy resource.

Claims (1)

[Claims] 1. Production of pellet fuel using waste paper as a raw material, which is characterized by pulverizing waste paper in a shredder, adding water and alkali in a stirrer, kneading it into slurry, and then pelletizing it in a granulator. Law.