PLANNING OF PT XYZ UNDERGROUND COAL MINING VENTILATION WITH LONGWALL METHOD USING VENTSIM VISUAL 5 SOFTWARE

• Main Author: Pamungkas, Faris
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/48582
• Institution: Institut Teknologi Bandung

Underground mining methods are currently being developed by mining companies, especially coal because of the greater stripping ratio value. A good mine ventilation system can create a healthy, safe and comfortable work environment. PT XYZ will conduct underground coal mining activities with the longwall method on seam F with coal thickness of 5.3 m and the slope of the coal seam is 9-18 °. So that the mine ventilation design is needed in accordance with Kepdirjen Minerba No.185.K/37.04/DJB/2019 and estimates the costs required to carry out the design of an underground mine ventilation system. The first step is to take secondary data to determine the dimensions and number of underground opening holes, equipment used, number of workers, fan specifications, and equipment prices. After that, calculation of air requirements based on workers and methane gas, determine the content of contaminants, and determine the parameters of resistance flow, shock loss, and friction factor. Maximum air demand is added by 15% of the total air requirement based on Kepmen ESDM No.1827 K/30/MEM/2018. From the data there is then performed tunnel modeling as an air channel using Ventsim Visual 5 software and simulated air flow using fans and duct to meet the air quantity in accordance with the calculation of air requirements and regulations. The calculated air requirement for mining face is 47 m3/s, heading face 6.8 m3/s, electric belt conveyor (EBC) 8 m3/s, chamber 3 m3/s, and sump 5 m3/s. From the simulation results using Ventsim Visual 5 software it was found that the air quantity at the mining face, head face, chamber, and EBC had met the air requirements based on the air needs allocation. The air velocity in the chamber and heading face needs to be increased by using a blower so that the air flow velocity can increase. The effective temperature on mining face is 18.2-21.8°C, on the heading face 21.6-26.3°C, the chamber is around 24.7-26.1°C, EBC and sump is around 21.9-25.7°C with relative humidity around 33.7-96.8%. From the simulation results, the calculation of ventilation costs is then performed and the results show that the largest ventilation costs are used to meet electricity needs with a percentage of 88% of the total cost of ventilation. The cost of ventilation in year 0 is $ 806,096, year 1 is $ 1,191,248, year 2 is $ 1,243,112, year 3 is $ 1,248,534, and year 4 is $ 1,069,266