JPS5938291A - Binder for solid fuel and solid fuel - Google Patents

Abstract

PURPOSE:A solid fuel of a high calorific value, resistant to moisture and swelling, and excellent in mechanical strength, which is obtd. by mixing a binder obtd. by crushing a mixture of asphalt and petroleum pitch, with a crushed solid combustible material followed by pressure molding. CONSTITUTION:67-900pts.wt. petroleum pitch is added to 100pts.wt. asphalt. After fusion and mixing, the resulting mixture is cooled and crushed to a particle size of 0.01-5mm. to obtain a binder for solid fuel which is powdery at normal temp. and has a softening temp. of 110-130 deg.C. Then, 3-80wt% said binder is added to and mixed with a solid combustible material crushed to a particle size of 1-3mm. such as wood flour and the mixture is pressed at a pressure of 200-500kg/cm<2> to be molded into a desired form. EFFECT:It is possible to obtain a solid fuel at a low cost because the binder is easily mixed uniformly with the solid combustible material, and the binder melts under a min. pressure and exhibits adhesion during pressure molding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a caking material for solid fuel and a solid fuel obtained using the same.

Conventionally, a typical example of a solid fuel without the addition of a caking agent is one produced by the Udex method. This is 1000K for molding
It requires a pressure of more than g/cm2, and has the disadvantage that the product swells and deforms when it absorbs moisture. In order to solve these drawbacks, for example, Japanese Patent Application Laid-Open No. 56-103280 discloses that a molten mixture of strongly oxidized asphalt and olefinic IH fat is powdered and used as a caking agent for solid fuel. Methods of use are disclosed. However, this method has the disadvantage that asphalt (M) must be oxidized in the presence of a catalyst, and the petroleum residue and its additives cannot be used as a caking agent as is, resulting in high processing costs. be. In other words, as a caking material, it satisfies the dual properties of being a powder that does not soften at room temperature and easily mixing with solid combustible materials, and exhibiting caking properties by melting at a minimum pressure during pressure molding. Moreover, it is desirable to use a veneer that can be mass-produced at low industrial cost.

As a result of extensive research from this perspective, the present inventors mixed and melted asphalt and petroleum pitch in an appropriate ratio,
The inventors have discovered that by pulverizing this, an extremely inexpensive caking material can be obtained that satisfies conditions 2.2 and 2.2 and that the petroleum residue and its processed products can be used as they are, leading to the present invention.

That is, the present invention is based on a mixture consisting of 100 parts by weight of asphalt and 67 to 900 parts by weight of petroleum pitch,
This is melted, cooled, and then pulverized to produce a solid fuel caking material that is powder-like at room temperature.

Then, the weight ratio of the caking agent described in "2" to the solid combustible material is 3
After adding ~80% and mixing, by pressure molding, the caking agent melts due to the compression heat generated during pressure molding and exhibits caking properties, resulting in strong mechanical strength and resistance to changes in humidity. Solid fuel is obtained.

The asphalts used in the present invention generally include natural asphalt, which has a low softening point and strong caking properties, straight asphalt, blown asphalt, descaled asphalt, etc. These are inexpensive and easily available commercially available products that can be used as they are. can do.

To 100 parts by weight, 67 to 900 parts by weight, preferably 1.50 to 230 parts by weight, of petroleum pitch are added, mixed and melted in a usual manner, cooled and pulverized to a particle size of 0. .01~0.5+npA powder form. The mixing ratio varies slightly depending on the properties of the asphalt used, but by adjusting it so that its softening point is 110 to +30'c, the caking material targeted by the present invention can be obtained.

Next, the solid fuel to which a caking agent is added is obtained as described in Section 2.The raw material for the solid fuel is preferably any crushed combustible material that does not emit harmful gases. Can be used, for example, as agricultural and forestry waste, such as rice husks,
Wheat husks, dried grass, straw, weeds, cutlets, tobacco stems, kapok seeds, chips, wood bark, animal manure, vegetable fibers, chicken manure, etc. are used as food industry waste, such as coffee grains, almond shells, walnut shells, tangerine peels, and plums. Fruit husks, candy waste, sugar residue, beer lees, etc., as well as industrial waste, such as waste plastics (polyethylene, polypropylene, polystyrene and other synthetic resins), wood flour, pulp powder, paper sludge, sawdust, and cancer. Waste paper, old tires, brewer's sludge, waste rubber, surplus sludge, fly ash, oil sludge, crude oil sludge, waste lubricating oil, waste carbon black, municipal waste, powdered coal, powdered coke, etc. These combustible materials are dehydrated and dried as necessary.

Next, in order to produce solid fuel using the solid combustible material as a raw material, it is pulverized to a particle size of 1 to 3,111 ffl, and the powdery caking agent is added to the powder in a weight ratio of 3 to 80%, preferably 5 to 15%.
%, add and mix uniformly, 200-500 Kg/c
It is molded into the desired shape into granules, cylinders, and pellets at a pressure of m2. If the binder content is less than 3%, the adhesion will be poor and high pressure will be required for molding, and if it is more than 80%, the purpose of the present invention, which is to effectively utilize industrial waste, will be deviated from. 5-15 due to its adhesiveness and economical efficiency
% is most preferable.

According to the present invention, unlike the case of the above-mentioned known technology, the caking agent for solid fuel does not require any treatment such as a catalyst or forced oxidation, and petroleum residues and processed products thereof can be used effectively as they are. end. In addition, by utilizing the fact that the caking material melts due to the compression heat generated when molding solid combustible materials using this caking material and exhibits tackiness, molding can be performed at an extremely low pressure compared to the Udex method described above. In addition, it is a type of fuel that does not require external heating to combust, such as light, has moisture and swelling resistance, has strong mechanical strength, and has a higher calorific value than solid fuel without the addition of a binder. can be mass-produced cheaply.

Next, the present invention will be specifically explained with reference to Examples.

Example papermaking] Pulp sludge discharged from two units (moisture 80%,
Wet base) is dehydrated using a screw press (30% moisture, dry base), and this is dried to 100% with a dryer.
Drying at ~120°C gave a dry solid with a moisture content of 15% (dry basis). After adding 10% by weight of the caking agent of the present invention to this solid and thoroughly dissipating it, 300 kg/cm
2 to continuously produce a long cylindrical body with an outer diameter of 6 mm, which was cut into 20 mm pieces to obtain a solid fuel. This solid fuel has excellent moisture and swelling resistance, does not undergo any deformation during long-term storage, and has an excellent rating of 8! It has mechanical strength and is extremely convenient to manufacture, store, transport, and handle. In addition, this solid fuel has a calorific value of 4,000-6,000 Kcal/Kg, which is equivalent to or higher than general wood or lignite fuel, and it can be used to eliminate pulp sludge, which has traditionally been extremely difficult to dispose of as industrial waste. It can be effectively used as energy.

Patent applicant Owl Co., Ltd.

Claims (1)

[Claims] 1) 100 parts by weight of asphalt and petroleum pitch 67-9
The main material is a mixture consisting of 00 parts by weight, which is melted,
A caking material for solid fuel that is powder-like at room temperature and is made by pulverizing after cooling. 2) The main phase is a mixture of 100 parts by weight of asphalt and 67 to 900 parts by weight of petroleum pitch in the pulverized solid combustible material, which is melted, cooled, and then pulverized to produce a solid fuel viscous material that is powder-like at room temperature. A solid fuel made by adding and mixing 3 to 80% binder by weight and then press-molding the mixture.