文献类型：期刊文献

英文题名：Process modelling of two-stage entrained-bed gasification composed of rapid pyrolysis and gasification processes

作者：Gao, Rui[1];Huang, Bo[1];Huang, Jian[1];Xu, Jianliang[1];Dai, Zhenghua[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Shanghai 200237, Peoples R China

年份：2020

卷号：262

外文期刊名：FUEL

收录：;EI(收录号：20194807737051);WOS:【SCI-EXPANDED(收录号:WOS:000500166500113)】；

基金：The authors are grateful for the financial support from the National Key R&D Program of China (Grant 2018YFB0605000 and Grant 2018YFC0808500 and Grant 2017YFB0602600) and the National Natural Science Foundation of China (Grant No. 21776087).

语种：英文

外文关键词：Two-stage; Entrained-bed gasification; Rapid pyrolysis; Tar; Framework

摘要：A novel two-stage entrained-bed gasification system composed of the rapid pyrolysis of pulverized coal and the gasification of char is proposed to obtain high-quality synthetic gas with low tar content and high methane content. A new framework containing a modified multi-step kinetic pyrolysis model and a non-linear programming (NLP) process is developed to simulate the rapid pyrolysis process of pulverized coal. The method can be used to simulate the volatile composition, which includes only the high-weight hydrocarbons/distillable liquids (benzene, toluene, xylene, naphthalene, pyrene, phenol) based on the proximate and ultimate analysis data of coal. The framework for coal rapid pyrolysis and the simulation of the two-stage entrained-bed gasification are validated by experimental data and semi-industrial data, respectively. This paper analyses the effects of the final pyrolysis temperature, the gas residence time, and the steam/coal ratio on the performance of the two-stage entrained-bed gasification system. The results indicate that by adjusting the gas residence time to 15.5 s at the final pyrolysis temperature of 1000 degrees C, the tar yield can be reduced to less than 500 mg/Nm(3), the molar fraction of methane in the syngas can be approximately 5.84%, the exit temperature can be approximately 943 degrees C, and the higher heating value (HHV) of syngas and the cold gas efficiency (CGE) will be 11.41 MJ/(Nm(3)) and 91.23%, respectively.