1. School of Transportation Engineering, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, Jiangsu, P.R. China
2. Jiangsu Engineering Lab of Biomass Resources Comprehensive Utilization, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, Jiangsu, P.R. China
3. National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
4. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China