Abstract
For the time being, moisture effect to the useful quality of coals has been researched comprehensively in detail. Herewith, there are a lot of unsolved problems related to the safety working out of coal layers. Presence of different forms of moisture in fossil coals essentially influences the coal layers hazardous characteristics manifestation during the mining activities. The Article deals with the results of analyses of more than thousand samples of the Donets Basin coals from different deposits, to research the relationship of total moisture and organic matter components in the coal carbonizations during the metamorphic processes. The researches have allowed separation of 3 stages for the fossil coal conversions. It is noted that at the initial stage, the carbon content is about 80%, moisture proportion in carbonization is rather high—0.36; but it decreases abruptly down to 0.12, in case of the carbon content increasing up to 86.5%. And the proportion of components (hydrogen, oxygen, nitrogen, and sulphur) total increases essentially up to 0.88. At the next stage, at 86.5÷91.5%, the components proportion in carbonization changes insignificantly. At the final stage of coal metamorphic conversions, 4-time growth of moisture proportion takes place in carbonization. It is found that moisture proportion in any form to be found in the coals shall be considered as a rank index, which is necessary to determine the coal layers hazardous characteristics.
Highlights
Moisture is one of the most important quality indicators of coals
The work procedure is based on the functional dependence of the totality of considered organic matter components on the carbon content [18, 19]
This provision is confirmed by the experimental data concerning variation of the components (Н0, О0, N0, S0) totality depending on the carbon content in organic matter (Fig. 1, Curve 2)
Summary
Moisture is one of the most important quality indicators of coals. The significant content of moisture has an adverse effect to heating-performance and processing characteristics of coal; it reduces its calorific value and thermal resistance; its grinding, screening, and dressing becomes more difficult; it increases its carbonizing time and other coal processes, and makes its transportation (as ballast) more expensive [1].To determine the above properties, the total coal moisture content (W) dried out to the constant weight at 105÷110°С shall be found. Moisture is one of the most important quality indicators of coals. The significant content of moisture has an adverse effect to heating-performance and processing characteristics of coal; it reduces its calorific value and thermal resistance; its grinding, screening, and dressing becomes more difficult; it increases its carbonizing time and other coal processes, and makes its transportation (as ballast) more expensive [1]. To determine the above properties, the total coal moisture content (W) dried out to the constant weight at 105÷110°С shall be found. No pyrogenetic and hydrate moisture is removed and takes part in the total moisture content. The moisture influence to the coal useful properties has been researched comprehensively in detail. There are a lot of unsolved problems related to the safety working out of coal layers
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