Modeling coal pyrolysis in a cocurrent downer reactor  

作　　者：Yan Zhang Yuehong Zhao Xianfeng He 

机构地区：[1]State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Particuology》2015年第4期154-159,共6页颗粒学报（英文版）

基　　金：financially supported by the International Science & Technology Cooperation Program of MOST(No.2011DFA61360);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA07080400);the National Nature Science Foundation of China(No.20703047)

摘　　要：In this paper, a model for fast coal pyrolysis in a cocurrent downer reactor is developed, in which both hydrodynamics and coal pyrolysis kinetics are simultaneously considered. The results of simulations based on this model display reasonable agreement with experimental data obtained using Huolinhe coal as the feedstock, and this model is therefore suitable for predicting the fast pyrolysis of specific coal types. A series of simulations of fast coal pyrolysis in a cocurrent downer demonstrated that coal devolatilization is almost complete in the inlet region within a time span of 0.4 s, and that higher temperatures improve the pyrolysis efficiency. However, the yield of liquid products is decreased with increasing pyrolysis temperatures, especially above 670 ℃, because of additional cracking of the liquids.In this paper, a model for fast coal pyrolysis in a cocurrent downer reactor is developed, in which both hydrodynamics and coal pyrolysis kinetics are simultaneously considered. The results of simulations based on this model display reasonable agreement with experimental data obtained using Huolinhe coal as the feedstock, and this model is therefore suitable for predicting the fast pyrolysis of specific coal types. A series of simulations of fast coal pyrolysis in a cocurrent downer demonstrated that coal devolatilization is almost complete in the inlet region within a time span of 0.4 s, and that higher temperatures improve the pyrolysis efficiency. However, the yield of liquid products is decreased with increasing pyrolysis temperatures, especially above 670 ℃, because of additional cracking of the liquids.

关 键 词：Coal pyrolysis MODEL Cocurrent downer Low-rank coal 

分 类 号：TQ530.2[化学工程—煤化学工程] TQ051.1