COMPUTATIONAL FLUID DYNAMICS MODELING TO ANALYZE TEMPERATURE CHANGES AT WORKING FACE DEVELOPMENT OF UNDERGROUND GOLD MINE THROUGH AUXILIARY FAN SYSTEM ADJUSTMENT

• Main Author: Ivana
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57401
• Institution: Institut Teknologi Bandung

Ventilation system is very important for miners’ safety in underground mining. Auxiliary fan systems have been widely used in underground mines, particularly where the air from main ventilation system cannot reach. In this study, will be carried out a simulation using a numerical method called Computational Fluid Dynamics (CFD) using Ansys software to determine a good auxiliary ventilation system in controlling heat at the working face of an underground gold mine. The numerical model of the auxiliary ventilation system validated based on field data studied by Gani (2017). The auxiliary ventilation system models were analyzed are NFFE (near-forcing farexhausting), PF (pure forcing), PE (pure exhausting) and NEFF (near-exhausting far-forcing) with the condition of the dimensions of the air duct existing in Gani’s research (2017), diameter 0.85m, intake duct length 58m, and exhaust duct length 38m. Comparison of velocity and temperature values from numerical simulations between the four ventilation systems will confirm the best system in temperature controlling and air requirements supplying in heading development. The velocity of the NFFE, PF, PE and NEFF systems on the working face sequentially are 0.1099 m/s, 0.0999 m/s, 0.0089 m/s, and 0.057 m/s. The temperatures of the NFFE, PF, PE and NEFF systems on the working face respectively are 31.28 °C, 31.29 °C, 31.56 °C, and 31.81 °C. The most suitable auxiliary ventilation system in supplying air and controlling the temperature at the working face among those four systems is NFFE. The results of this study, so that the NFFE system can reach the minimum speed and maximum temperature set by the Decree of the Minister of Energy and Mineral Resources of the Republic of Indonesia No. 1827 K/30/MEM/2018, the minimum incoming air quantity must be 3.3 m3/s and the intake air through air duct must be cooled to a temperature of 21°C.