Combustion characteristics of pyrolysis char of Buliangou coal

Coal pyrolysis is an effective and efficient method to produce coal gas, tar and clean char. The char, as the main product, is always used for combustion. To investigate the combustion performances of pyrolysis char, the non-isothermal thermal-gravity analysis was taken to study the effect of pyrolysis temperature, holding time and atmosphere on combustion of the resultant pyrolysis char of Buliangou coal in this paper. And Coats-Redfern integrate method was used to kinetic analysis of char combustion. The results showed that the pyrolysis temperature obviously influenced the combustion of char prepared by the integrated process of CO2 reforming of CH4 with coal pyrolysis. The combustion performance of char decreased and activation energy gradually increased with increasing pyrolysis temperature, which was positively related with low volatile in the char. Pyrolysis holding time and atmosphere had slight effect on char combustion. The char from hydropyrolysis and integrated process showed the similar combustion behaviors and activation energy as those obtained under N2 atmosphere. The heating rate of combustion affected the char combustion characteristics. High heating rate resulted in combustion at high temperature. © 2017, Chemical Industry Press. All right reserved.