Combustion of condensed particule

AdN

Hello evrebody, I will be grateful, if someone could help me to found the way to modelise the combustion of a solid by a gaz. In fact, in the first time I would to modelise combustion of coal by O2, and I don't know the right model to use. I try the non-premixed combustion but the only way to introduce coal is the injection of particule. But it's not an injection that I want to do. So I try the multiphasique model, with the Eulerian, but I don't succed, because the radiation model is disable... The goal of my modelisation, is to establish the trajectory of the combustion... Thank you