Experimental study on the coalification dynamic of long flame coal pyrolysis

Long flame coal from the Shenfu-Dongsheng coal field in the Ordos Basin is pyrolyzed for coalification dynamic experiments using HYLZ-2 cryogenic dry distillation furnace. The pyrolysis procedure is designed to contain three sequence phases: starting with the dry dewatering phase (20 to 245°C), following through the transition phase of slight pyrolysis (245 to 460°C or to 485°C, and to 510°C) both at 5°C /min constant heating rate, and ending by the strong isothermal pyrolysis phase at those three temperatures for certain time. For the isothermal pyrolysis, the activation energy of coalification E =168.77KJ/mol, and the pre-exponential factor lnA=22.316. For the constant heating rate pyrolysis, the activation energy of coalification E =28.1 KJ/mol, and the pre-exponential factor lnA=2.985.