Industrial-scale Fixed-bed Coal Gasification: Modeling, Simulation and Thermodynamic Analysis

作     者：何畅 冯霄 Khim Hoong Chu 李安学 刘永健 HE Chang;FENG Xiao;Khim Hoong Chu;LI Anxue;LIU Yongjian

作者机构：State Key Laboratory of Heavy Oil Processing China University of Petroleum HoneychemNanjing Chemical Industry Park Liaoning Datang International Fuxin Coal-To-SNG CO.LTD 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2014年第22卷第5期

页      面：522-530页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Supported by the National Basic Research Program of China(2012CB720500) the National Natural Science Foundation of China(U1162121) 

主　　题：Lurgi gasifier gasification syngas pyrolysis exergetic efficiency 

摘      要：We have developed a process model to simulate the behavior of an industrial-scale pressurized Lurgi fixed-bed coal gasifier using Aspen Plus and General Algebraic Modeling System(GAMS). Reaction characteristics in the fixed-bed gasifier comprising four sequential reaction zones—drying, pyrolysis, combustion and gasification are respectively modeled. A non-linear programming(NLP) model is developed for the pyrolysis zone to estimate the products composition which includes char, coal gases and distillable liquids. A four-stage model with restricted equilibrium temperature is used to study the thermodynamic equilibrium characteristics and calculate the composition of syngas in the combustion and gasification zones. The thermodynamic analysis shows that the exergetic efficiency of the fixed-bed gasifier is mainly determined by the oxygen/coal ratio. The exergetic efficiency of the process will reach an optimum value of 78.3% when the oxygen/coal and steam/coal mass ratios are 0.14 and 0.80, respectively.