This study aims to analyze the effect of the size and ratio of limestone dust on the pressure value, the rate of change of pressure and the critical ratio of limestone dust immediately before the explosion. This study used a USBM Siwek 20-L Explosion Chamber explosive tube with a coal concentration of 600 g/m 3 and an ignitor energy of 5 kJ. This test uses limestone dust with sizes of 177-74 µm and 74-37 µm and coal dust with sizes of 74-53 µm and 53-44 µm. The results of the first study on coal dust size 53-44 µm showed that the critical ratio between coal dust and limestone dust size 177-74 µm was at a ratio of 44.3:55.7 and for limestone dust 74-37 µm at a ratio of 45.1:54.9. Whereas for coal dust size 74-53 µm, the critical ratio of coal dust to limestone dust size 177-74 µm was obtained at 62.82:37.18 and for limestone dust size 74-37 µm at 81.99:18.01. In terms of the ratio of coal and limestone dust, the result is that the greater the ratio of coal dust compared to the ratio of limestone dust, the greater the pressure and the rate of change of pressure of the coal dust explosion. Based on the size of the limestone, the finer the size of the limestone dust, the lower the pressure and the rate of change of pressure from the coal dust explosion. Meanwhile, based on the size of the coal, the finer the size of the coal, the greater the potential to cause an explosion.
Oleh :
Ririn Yulianti
