Pyrolysis Of Direct Coal Liquefacton Residue

How to utilize the residue is a urgent one among tasks and has significant economical efficiency for Direct Coal Liquefaction is commercialized. Pyrolysis is base and happens in almost all process of coal conversion and utilization, It for residue just as it for coal. It is to provide basic theory guidance for residue utilized reasonably and efficiently studying pyrolysis characteristic and mechanism.Prolysis experiments were carried out by using thermo-balance, fixed-bed pyrolyzer. The main conclusions are following:Residue is a mixture with high carbon, sulfur, ash and hydrogen content. The pyrrhotite (Fe_1-xS) ,which is a main type of sulfur, is conversed from sulfur-rich to meager along with rising up pyrolytic temperature. The fluidity of residue molten is poor because of its high viscosity ,and hydrogen bond make its viscosity turnabout at 258℃.Residue has higher conversion, tar, gas volume yield and less water yield than parent coal. The characteristic of pyrolysis gas and its H₂ evolved is two peak, at the same condition of experiments, it has higher H₂ and less CO₂, CO content than parent coal. It is helpful to understand pyrolysis process and mechanism that building DAEM (Distribution Activation Energy Model) .In the case of co-pyrolysis of residue and parent coal, It is supposed that residue is not only hydrogen donor, but hydrogen shuttle, that THF(tetrahydrofuran) soluble danates hydrogen to coal.