STUDY OF COAL DUST CONCENTRATION 74-53 ?m EFFECT ON EXPLOSION PRESSURE OF COAL USING 20 LITER EXPLOSION CHAMBER AT LABORATORY SCALE FOR COAL FROM JAMBI PROVINCE

• Main Author: Julia Azwar, Utari
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42766
• Institution: Institut Teknologi Bandung

Coal dust is one of the elements that can cause an underground coal mine explosion. High levels of coal dust in the air not only affect the health of mine workers, but can cause mining accidents that cause destruction to death, so needed for research on coal dust. The current study was conducted by testing coal from Jambi Province, using coal explosive test equipment explosion chamber 20 Liters, based on ASTM E 1226 and ASTM E 1515 references. Research was conducted on coal dust 74 - 53?m with a concentration of 200 g/m3, 600 g/m3, 1000 g/m3, 1200 g/m3, 1400 g/m3, 1600 g/m3, 1800 g/m3, and 2000 g/m3, using a pyrotechnic heat source of 4.19 kJ and compressed air of ± 19.5 bar. The minimum explosible concentration occurs at concentrations between 150 g/m3 to 175 g/m3 with PR of 5.89 and the Kst 13.92 bar.m/s. In addition, the maximum pressure obtained occurs at a concentration of 1000 g/m3 with 9.83 bar. The maximum rate of pressure occurs at a concentration of 1400 g/m3 and 600 g/m3 of 394.76 bar/s. Kst produced from this explosive test was around 116.47 bar.m/s so it was included in the category of weak explosion class. Dimension analysis is performed to determine a good correlation between the parameters, pressure produced and the concentration used. In addition, visualization of combustion was carried out at a concentration of 1000 g/m3, because at this concentration it was considered to be the most dangerous which produced the highest pressure for coal dust 74 - 53?m with a burning duration of 1.35 s. The peak of the combustion process occurs at 426 ms. This is generally in accordance with data obtained from pressure sensors.