Numerical Simulation on Homogeneous Ignition Temperature of Pulverized Coal Group

The ignition characteristics of pulverized coal group were investigated with homogeneous ignition model considering the ignition limit. The homogeneous ignition temperature (HIT) of group was found to decrease with increasing pulverized coal size, and this influence of coal size weakened obviously with the increasing coal concentration in pulverized coal group. The higher coal concentration in group was in favor of the HIT decrease, but which was not very obvious. With the increasing oxygen partial pressure in group, that HIT also lowered. In addition, the HIT decreased firstly, then increased with the increasing ambient gaseous temperature, due to the dual effects of increasing heating rate and increasing diffusion coefficient.