JPH0237398B2 - FUKUGOKOKEINENRYONOSEIZOHOHO - Google Patents

Description

[Detailed description of the invention]

In the paper industry, recovered waste paper is digested and crushed to remove cellulose and used again as a raw material for paper. The recovered waste paper mentioned above contains a considerable amount of thermoplastic synthetic resin such as polyethylene film, and these are collected in a filtration unit and a considerable portion (usually 50 to 60% on a dry basis) of the cooking residue to be disposed of. %) is emitted. These wastes are either used directly in landfills or burned for thermal energy and then disposed of. On the other hand, in the citrus processing industry, a large amount of pericarp, pomace, etc. (herein referred to as citrus processing waste) is produced as a by-product, and some of these citrus processing wastes are used as fertilizer or feed. Although some of it is used, most of it is left unused. Recently, attempts have been made to dehydrate and dry this waste and use it as fuel as it is or after granulating it, but the calorific value is low.
As it is extremely low-grade as an energy source at around 3880kcal/Kg, it has almost no value in use. This invention was proposed for the purpose of obtaining a high-quality composite solid fuel by using the thermoplastic synthetic resin-containing residue and citrus processing waste discharged in the waste paper digestion process of the paper industry mentioned above. be. The cooking residue generated when cellulose is separated from recovered paper in the paper manufacturing industry often contains about 50 to 60% polyethylene, polypropylene, and other polyolefin synthetic resins on a dry basis. This makes effective use of the thermoplastic synthetic resin content in the cooking residue, which does not generate toxic gas even if the cooking residue is heated. Further, as the second raw material, pericarp, squeezed lees, etc. (citrus processing waste) discharged in the citrus processing industry are used. In the present invention, the above-mentioned cooking residue and citrus processing waste are dehydrated or dried as necessary so that the water content is 20% or less, and then pulverized to a particle size of several mm or less. The content of thermoplastic synthetic resin in the product solid fuel is 20 to 70% by weight on a dry basis. Then, the mixture is heated at 100 to 300°C to semi-melt it and kneaded, and then compressed with a compression force of 50 kg using an extrusion compression molding machine, a twin-wheel compression molding machine, or other molding equipment, taking advantage of the tackiness of the mixed thermoplastic synthetic resin. A solid fuel product is obtained by molding into granules or lumps with a size of 5 mm or more and 100 mm or less using a pressure of about /cm ² or more. The mixing ratio of cooking residue containing thermoplastic synthetic resin and citrus processing waste was determined through preliminary testing through sampling, and the content of thermoplastic synthetic resin in the product solid fuel was in the range of 20 to 70% by weight on a dry basis. It is determined so that it fits within the following. In the method for producing the composite solid fuel described above, a part of the citrus processing waste can also be replaced with other combustible substances. The combustible materials include wood chips, bark, other fibrous waste such as rice straw,
Examples include carbides thereof and mineral carbon powder. Next, the results of tests conducted by the inventors of the present application will be shown. Table 1 shows the experimental results when solid fuel was produced by changing the mixing ratio of cooking residue containing thermoplastic synthetic resin and citrus processing waste, and Table 2 shows the results of experiments using cooking residue, citrus processing waste, and fibers. These are the results of an experiment in which solid fuel was produced by changing the blending ratio of quality waste (however, the amounts of citrus processing waste and fibrous waste were the same).

【table】

[Table] The method for producing a composite solid fuel of the present invention effectively uses industrial waste that is difficult to use as fuel alone, such as cooking residue containing thermoplastic synthetic resin after cellulose over-separation of recovered waste paper and citrus processing waste. In addition, the solid fuel produced by this method coats the surface of other raw material particles with the thermoplastic synthetic resin in the melted cooking residue to firmly bond many particles. And so,
As shown in Tables 1 and 2, the water absorption rate is low;
Since it has excellent strength, it has the advantage of being able to be stored outdoors for a long time. Furthermore, the solid fuel is less likely to disintegrate during the combustion process, has an appropriate calorific value, and exhibits high heat load characteristics while enabling sustained combustion, making it widely applicable to various combustion devices. It can be measured and used as a high quality fuel.

Claims (1)

[Claims] 1. Citrus processing waste is added to the cooking residue containing thermoplastic synthetic resin generated when cellulose is separated from recovered waste paper in the paper manufacturing industry.The content of thermoplastic synthetic resin in the product is 20 to 70% by weight. %, heated at 100 to 300°C to semi-melt, kneaded, and then pressure-molded into granules or lumps with a size of 5 mm or more. . 2. Citrus processing waste and other flammable substances are added to the cooking residue containing thermoplastic synthetic resins generated when cellulose is separated from recovered paper in the paper industry.The content of thermoplastic synthetic resins in the product is 20%.
Mix it so that it is ~70% by weight and then add it to 100~300
1. A method for producing a composite solid fuel, which comprises heating to semi-melt it at °C, kneading it, and then press-molding it into granules or lumps with a size of 5 mm or more.