EFFECT OF PARTICLE-SIZE AND AIR FLOW RATES ON THE IGNITION TEMPERATURE OF SUB BITUMINOUS COAL

Spontaneous ignition and combustion of coal are the major problems for its mining and usage. The temperature of ignition or combustion of the coal mainly depends upon its rank. Generally, coals having lower ranks are more prone to the spontaneous ignition or combustion than the coal having higher ranks. But many times, as an exception, as the rank increases, the coal becomes more susceptible to spontaneous ignition. To check the variables which affect the susceptibility of the ignition of the coal, practical experimentation can be carried with some proper combustion setup. Bituminous coal is generally used in many applications. But to reduce the use of it, sub-bituminous coal may be examined. Keywords— Bituminous Coal, Sub-bituminous Coal, Volatile Material, Particle Size, air flow rate, Ignition Temperature.