Experimental Study of Rapid Brown Coal Pyrolysis at High Temperature

摘要

Rapid coal pyrolysis is a very important step in the early stage of combustion.Rapid pyrolysis experiments of a brown coal at high temperature have been studied on a laminar drop tube furnace. The volatile mass release measured in this study is high for low rank coal. The activation energy and pre-exponential factor of pyrolysis are 19901.22 kJ/mol and 102.71,respectively. The nitrogen distribution between volatile and char is 0.54.With the increase of temperature, the yields of NH3 decreases,while those of HCN increases,leading the value of HCN/NH3 to become larger.At high temperature, the main nitrogencontaining species of pyrolysis in volatile is HCN.