Разработка технологиии брикетирования угольной мелочи с помощью продуктов перерабоки чертополоха и эремуруса

Abstract

BRIQUETTING OF FINE COAL WITH THE USE OF PRODUCT BIOMASS EREMURUS AND THISTLE

A. Ismanjanov, T. Dzholdosheva, Ch. Adylov

Kyrgyzstan has a huge coal reserves. Tentatively its reserves are estimated at 30 billion tons. Significant amount of coal in the form of fines is being lost at the production site, transportation, storage and incineration on grates. One way of recovery of coal fines is their granulation or briquetting with cohesive. As a cohesive mainly organic cohesive are used as bitumen, waste oil and fat production, as well as inorganic cohesive as - bentonite clay, loess loam, etc. The most promising in terms of calorific value of briquettes are organic cohesive. However, their resources are limited. The base of organic cohesive could have been possible to compensate by the use of vegetation of processed products, growing in the territory of Central Asia, and particularly in Kyrgyzstan. Our researches have shown that wild plants - Eremurus and Thistle is suitable for these purposes.

In this work investigated the possibility of using the adhesive received from the leaves, seeds and roots of Eremurus and Thistle, growing on pastures of Osh region of Kyrgyzstan's as a cohesive in briquetting of coal fines.

For the experiments, fine coal was taken from three deposits located in the south of Kyrgyzstan: Kozhokelen, Alai and Sulukta, differing both in composition and calorific value.

The process of preparing a cohesive of Eremurus and Thistle made under the following scheme: First pulled out Eremurus stems and roots with the Thistle and cleaned of adhering soil. Seeds separated by swing, stems and roots are dried thoroughly. Then dried roots and stems are milled into flour in a ball mill. The resulting powder has a fractional composition of 0-1 mm. Adding powders of Eremurus and Thistle into fine coal, conducted in its two forms: first - in a dry condition followed by the adding water to the charge (a mixture of coal and powder), and the second - in the form of emulsion, a powder received by boiling in water to receive an adhesive.

Experiments have shown that with increasing concentrations of Eremurus as well as Bentonite, solidity of the briquettes is enhanced. At concentrations of Eremurus 20-22% or more of such a growth is relatively reduced. Character of the increase of briquettes solidity is different for a different ranges of crushing of coal, and the concentration of Eremurus bentonite powder on the physical state Eremurus added powder (in powder form or as an emulsion).

Dependence of the solidity of briquettes made from flour and thistles emulsion has an optimal character. Stronger briquettes are received by adding the emulsion of thistles of 15-27%. Excess concentrations of 27% leads to an increase of the moisture of charge full compression isn’t happening.

Flour of thistle in the form of emulsion prepared by boiling, have higher binding properties, than in the case of using directly in the form of flour, and contribute to obtaining stronger briquette. Experiments have shown that with increase of concentration of thistle emulsion, solidity of the briquettes slightly increases.

Thus, the following conclusions can be drawn from the results of research:

1. Using the powder of Eremurus and Thistle as an organic cohesive for the briquetting of coal helps to ensure a solid briquettes with high calorific value.

2. The use of bentonite as an auxiliary cohesive, allows to consumption of the powders of Eremurus and Thistle, and receive briquettes with satisfactory solidity and calorific properties.

3. For a wide use of Eremurus powder as an adhesive is necessary to expand the area of its natural habitat and growing it in an industrial scale.

4. The collection and use of the Thistle as a raw material for the cohesive allows you to clear the area of pasture from the weeds and increase their productivity.