ANALYSIS OF METHANE GAS DILUTION WITH LOCAL FORCED VENTILATION IN LABORATORY SCALE UNDERGROUND COAL MINE DEVELOPMENT WORKING FACE

• Main Author: Ervando, Dicky
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67647
• Institution: Institut Teknologi Bandung

The presence of methane gas at concentrations between 5% to 15% in the air will cause an explosion if there is contact with a heat source. Therefore, to deal with the problem of methane gas emissions in underground coal mines, it is necessary to analyze the optimum methane gas dilution. Experimental simulation in research using tools and materials carried out at the Geomechanics & Mine Equipment Laboratory, Bandung Institute of Technology. Tunnel model development is made as close as possible to the actual conditions. For dilution testing using a forcing fan, this is done with a power variation of 10 Watt, 15 Watt, and 20 Watt. Variations in the distance of the duct to the work surface are also carried out by 6d, 7d, and 8d with a rigid duct diameter (d) of 5.08 cm. In each condition with the same fan power of 10 Watt, 15 Watt, and 20 Watt, it can be seen that the condition with the variation of the distance of the duct closest to the face of 6d, dilutes methane gas faster than conditions with variations of 7d and 8d. In each condition with the same duct-to-face distance of 6d, 7d, and 8d, it can be seen that the condition with a blowing fan power of 20 Watts dilutes methane gas faster than conditions with a blowing fan power of 10 Watt and 15 Watt. There is a difference in the value of the Taylor diffusion coefficient between theoretical and laboratory experiments. At the observation point of sensor 1, a large error is obtained, between -97% to -96%. The closer the distance from the duct to the face and the higher the fan power used, the faster the air flow rate and the value of the diffusion coefficient, so that the dilution time of methane gas will be faster.