DBPapers
DOI: 10.5593/SGEM2014/B13/S3.014

COMMENTS ON THE HEAT RELEASED DURING OPERATION IN HOT ROCK MASS AND ITS POSSIBLE APPLICATIONS

J. Cygankiewicz, J. Knechtel
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 99-106 pp

ABSTRACT
An investigation has been carried out into the heat flow in the mining section, in which the virgin rock temperature is above 50ºC. The total power of electrical devices installed in the section is about 6 MW. According to the climate regulations currently in force in the Polish mining industry, the air temperature in the workplace measured with a drybulb thermometer can not be higher than 33ºC. To provide in such section the temperature consistent with the regulations, fresh air supply workings must be equipped with cooling installation of the total cooling potential of about 2 MW. From the analysis of the results of mine climate predictions and modeling of the rock mass cooling around those workings it follows that about 30% of the cooling power is necessary to take away the thermal energy from the hot rock mass. Assuming the required air temperature at 28ºC (enabling unshortened working time), then the cooling power needed for taking away the heat from the rock mass would be much higher. The performed studies show that the amount of the thermal energy released in the mining section also depends on the phase of the longwall course (the length of main gates and changes in rock temperature in them). It has been proposed that hot water from condensers could power the absorption cooling devices located on the surface. In this way the costs of airconditioning would be reduced.

Keywords: underground mine, mining section, thermal working conditions, cooling devices, heat recovery