RU1810381C - Method of manufacturing moisture-resistant fuel briquettes - Google Patents

Abstract

Method for the production of moisture resistant fuel briquettes. SUMMARY OF THE INVENTION: crushed solid combustible material is mixed with a microbiological product of carbon-containing material. Compress the mixture at a pressure of 120-180 MPa. The resulting briquettes are impregnated with molten paraffin at 80-105 ° C; C and exposure time of 60-300 s. 1 ill., 2 tablets

Description

 The invention relates to the coal industry, and more specifically to the use of coal fines, and may find application in solving energy problems. The purpose of the invention is to increase the mechanical strength and heat resistance of the briquette; ;. . ... ...-

The coal-product mixture is pressed by microbiological processing of the carbon-containing material at a pressure of 120-180 MPa. The briquettes made by pressing said mixture are impregnated with molten paraffin at a paraffin temperature of 80-105 ° C for 60-300 s.

A comparative analysis of the claimed solution with the prototype shows that the claimed method differs from the prototype in that the product of microbiological processing of carbon-containing material is used as a binder and pressing is carried out at 120-180 MPa, and the hydrophobic coating is formed by impregnating the surface of the briquette with molten paraffin within 60-300 sec.

The drawing shows a schematic diagram of the proposed method for the production of moisture-resistant fuel briquettes is presented in the figure.

The method is carried out as follows.

Coal fines are crushed in a crusher 1 to a particle size of Ј 1 mm and sent via conveyor 2 to a chamber 3 for drying to a residual moisture content of 8%. Drying is carried out by flue gases coming from the furnace 4. From chamber 3, dried coal of a 1 mm fraction is conveyed through conveyor 2 to a mixer 5. From warehouse 6, the product of microbiological processing of carbon-containing material enters chamber 3 for drying to a residual moisture content of 8%. From chamber 3, the dried product of microbiological processing of the carbon-containing material together with coal enters through the conveyor 2 into the mixer 5, where the mixture is thoroughly mixed. The carbon: carbon microbial product ratio of the carbonaceous material is 1: 1. The following mixture arrives

ate

WITH

00

about

Oj 00

for pressing into the mold 7. The resulting briquettes are sent to impregnate their surface through a closed belt conveyor 8 passing through a bath 9 with spreading paraffin. The speed of the conveyor belt is such that the briquettes are in paraffin from 60 to 300 s. The temperature of the paraffin in the bath is maintained at 80-105 ° C by heating the bath in any known manner, for example water vapor. After passing through the molten paraffin, the briquettes enter the tray 10 for cooling and then enter the warehouse 11.

For example, Coal fines are crushed in a laboratory mill to a particle size of 1 mm, dried in an oven to a residual moisture content of 8%. The product of microbiological processing of carbon-containing material is also dried in an oven at 105 ° C to a residual moisture content of 8%.

25 g of dried charcoal and 25 g of dried product of microbiological processing of carbon-containing material are placed in a glass and mixed thoroughly with a laboratory stirrer,

The resulting mixture is pressed onto a hydraulic press type MS 500 with controlled compression pressure. The compaction pressure corresponds to 160 MPa. The mechanical strength of the briquettes is tested in accordance with GOST 21289-75. The mechanical strength of the resulting briquettes is 10.2 MPa.

Then the resulting briquette is immersed in a bath with molten paraffin at 80 ° C for 60 s. The briquette is allowed to cool in air and subjected to mechanical strength test according to GOST 21289-75 and water absorption according to GOST 21290-75. The mechanical strength of the briquette is 15.1 MPa, the moisture absorption of 10.0%. The experimental results are shown in the table (exp. 1 and 2).

Similarly, experiments were carried out at a pressing pressure of 160 MPa, a temperature of molten paraffin of 90 ° C, 105 ° C, a time of impregnation of the surface of the briquette with paraffin equal to 60, 120, 180, 300 sec and experiments with a constant time of impregnation of the surface of the briquette and a constant the temperature of the molten paraffin was 90 ° C. In all experiments, mechanical strength and percent moisture absorption were determined.

The results of all experiments are summarized in table 1.

In all experiments, 25 g of 1 mm coal fraction and 25 g of product were taken

microbiological processing of carbon-containing material.

An experiment was also conducted to compare the heat resistance of a briquette made using the technology of the prototype and a briquette made using the technology of the claimed method. For this, both briquettes were burnt under the same conditions, while the briquettes were of the same size. The experiments showed that the briquette made according to the prototype technology falls apart after 25-30 seconds and wakes up through the grates, before it has completely burned. The briquette made by the inventive method burns for 20-25 minutes, completely burned out, and an insignificant amount of smoke is formed in comparison with the known briquette.

From the conducted experiments, one can identify the following advantages of the claimed method in comparison with the prototype:

- higher mechanical strength; / ....

- - the briquette has sufficient heat resistance for complete combustion of coal particles; -.

...

- when the briquette is burned, less smoke is generated.

Table 2 presents the characteristics and compositions of the carbon-containing material and the product of its microbiological processing. -. .

These advantages are ensured by the fact that the carbon-containing material used as a binder for microbiological processing has a finely divided composition, which allows to fill the spaces between the coal particles as much as possible. In addition, the binder contains the products of the metabolism of microorganisms, as well as the partially oxidized organic component of the carbon-containing material, which contributes to the formation of sufficiently strong chemical bonds, the carbon-binder. Due to this, the melting of the binder at elevated temperatures is excluded. The product of microbiological processing of carbon-containing material is a combustible material and its burning temperature coincides with the burning temperature of coal. All of the above provides significant mechanical strength of the briquette, its high heat resistance and high performance.

Impregnation of the surface of the manufactured briquette with molten paraffin gives the briquette significant moisture resistance and further increases the mechanical strength exceeding the total strength provided separately by the binder and paraffin. A small layer of paraffin impregnation of the briquette makes it possible to obtain an environmentally friendly briquette.

Claims (3)

1. A method for the production of moisture resistant fuel briquettes, comprising mixing crushed solid combustible material with a binder, compressing the resulting mixture, treating the briquettes to form a coating, characterized 0 in order to increase the mechanical strength, the product of microbiological processing of carbon-containing material is used as a binder, and the briquettes are processed by impregnation with molten paraffin at 80-105 ° C and a holding time of 60-300 s. 2. A method according to claim 1, characterized in that the pressing is carried out at 120-180 MPa. 3. A method according to claim 1, characterized in that coal and / or peat are used as the carbon-containing material. Characterization and composition of carbon-containing material and the product of its microbiological processing Table 1 T "6 l and q in 2