IJPAM: Volume 114, No. 2 (2017)

Title

PECULIARITIES OF HEAT-MASS-EXCHANGE PROCESSES
IN FACES DEVELOPING STEEP COAL SEAMS

Authors

Vadim R. Alabyev$^1$, Marat L. Rudakov$^2$, Mariia A. Korobitcyna$^3$
$^{1,2,3}$Industrial Safety Department
Saint Petersburg
Mining University
199106, 21 Line Vassilievsky Isl.,
Saint Petersburg, RUSSIAN FEDERATION

Abstract

The paper shows the need for increasing accuracy of heat calculations in choosing chilling equipment for normalization of temperature conditions in working faces. The biggest error in prediction of temperature conditions is revealed in calculations of air temperature in faces developing steep coal seams, which is related to the peculiarities of technological processes taking place in excavation of coal. In the present work we have determined difference of heat-exchange processes between fossils and air within faces during development of steep flat and sloping coal seams. In faces with flat and sloping occurrence of seams the coal on conveying unit is considered a half-closed body, the surface of which provides convective heat exchange with air. At the same time, in face with steep occurrence of seams, where delivering of material is affected by gravity force, one should consider convective heat exchange of coal fraction within the air stream. There is a mathematical model for convective heat exchange between air and fossil in faces that develop steep coal seams, which includes a number of simplifying assumptions as well. Besides, there are engineering methods for calculation of heat emission from coal within faces under border condition of first and third types. There is also a new approach for recognition of heat transferring surfaces from a coal seam and developed space as for faces using pneumatic hammer and combining technologies of coal extraction. Based on the results of the research, assessment of the impact of heat emission from coal on the air temperature within longwall faces developing steep seams is given.

History

Received: April 4, 2017
Revised: April 24, 2017
Published: May 8, 2017

AMS Classification, Key Words

AMS Subject Classification: 03C01, 53B02, 34A01
Key Words and Phrases: mine, steep seams, longwall face, coal, temperature, temperature conditions, prediction methods, the coefficient of nonstationary heat exchange

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How to Cite?

DOI: 10.12732/ijpam.v114i2.18 How to cite this paper?

Source:
International Journal of Pure and Applied Mathematics
ISSN printed version: 1311-8080
ISSN on-line version: 1314-3395
Year: 2017
Volume: 114
Issue: 2
Pages: 389 - 400


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