ANALYSIS OF SUBBITUMINOUS COAL MINIMUM EXPLOSIBLE CONCENTRATION COAL DUST EXPLOSION SIZE 74-44 MICROMETER USING 20 LITER EXPLOSION CHAMBER

• Main Author: Wahyunintan Putri, Marlina
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/75254
• Institution: Institut Teknologi Bandung

Many hazards and risks can occur during the mining process, including a coal dust explosion in an underground coal mine. A coal dust explosion can occur if five causative components are met simultaneously: fuel, oxygen, heat source, dispersion, and confinement. This research aims to determine the Minimum Explosible Concentration (MEC), which is the minimum concentration of coal dust that can explode, to serve as a reference for avoiding coal dust explosions. The instrument used for the research is a 20 liter Siwek chamber, following the procedures outlined in ASTM E1226-19 and ASTM E1515-14. The test used a heat source of 4,61 kJ ignitor and a dust particle size of 74-44 ?m at concentrations of 50 g/???????? - 500 g/????????. According to ASTM E1515-14, dust is considered explosive if the Pressure Ratio (PR) value is ? 2 and the deflagration index (Kst) value is ? 1,5. Based on the conducted research, all tested concentrations were classified as explosion class 1 (weak explosion). From the analysis of the test data, the MEC value was obtained at a concentration of 130 g/????????. It can be concluded from the research that several factors influence the MEC value, such as volatile matter, calorific value, fixed carbon, particle size, and particle size range. In this study, particle size and particle size range had the most significant impact to MEC. As the particle size and range increase, the MEC value also increases because the distribution of dust during testing becomes uneven, and the reactive surface area decreases.