Minieiev S.P., Demchenko S.V., Oparin S.V. Makarenko R.V. Composition and quantity of combustion products determining in the coal self-ignition process

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Parent Category: Geo-Technical Mechanics, 2022

Category: Geo-Technical Mechanics, 2022, Issue 161

Geoteh. meh. 2022, 161, 68-76

https://doi.org/10.15407/geotm2022.161.068

 

COMPOSITION AND QUANTITY OF COMBUSTION PRODUCTS DETERMINING IN THE COAL SELF-IGNITION PROCESS

¹Minieiev S.P., ¹Demchenko S.V., ¹OparinS.V. ²MakarenkoR.V.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, ²MM named «Heroes of Space»

UDC 622.82:622.454

Language: English

Abstract. The study is dedicated to the mining processes research at high temperature, in particular, to determining the composition and quantity of possible combustion products, as well as determining of the thermodynamic properties for the mixture under different combustion conditions, which could be obtained by means of some simplifications applied and under the conditions in which combustion occurs. In mines, temperature parameters forecast within fire area for the fire development assessing in order to quickly extinguish fire is of considerable interest. These parameters are important for the actual assessment of the environment in the extinguishing area, as they are control ones to determine the rock cooling and, indirectly indicate fire has been extinguished. The paper presents theoretical thermodynamic studies of the equilibrium composition for gas phase components depending on process temperature and oxidant flow rate α, using software, designed to model chemical and phase equilibria at wide temperatures, taking into consideration coal of «Heroiv Kosmosu» coal mine. In calculating the parameters of the combustion process the composition and number of possible combustion products were determined as well as their thermodynamic properties under different combustion conditions for further development of new and improvement of existing methods for predicting spontaneous combustion of coal in mines were identified. The dependences of carbon monoxide content, which is of particular interest from the point of view of coal spontaneous combustion forecasting as well as total volume of the gas phase dependence on the oxidant consumption factor α are obtained. It was found that the increase in carbon monoxide content (increase in carbon monoxide concentration over 0.001% within the total volume of gas produced) begins in the temperature range from 700 K to 800 K regardless of the oxidant flow rate α, indicating the self-ignition core of the coal sample.
Keywords: self-ignition of coal, fire area, thermodynamic studies, temperature forecast, combustion products.

 

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