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

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, c...

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Bibliographic Details
Published inChinese journal of chemical engineering Vol. 22; no. 5; pp. 522 - 530
Main Author 何畅 冯霄 KhimHoongChu 李安学 刘永健
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2014
Subjects
Aspen
Coal
Combustion
Computational efficiency
Computer simulation
Computing time
exergetic efficiency
Exergy
Gasification
Lurgi gasifier
Plus软件
Pyrolysis
syngas
仿真
固定床煤气化
工业规模
建模系统
热力学分析
过程模型
syngas
pyrolysis
Lurgi gasifier
exergetic efficiency
gasification
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Summary: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 composi-tion of syngas in the combustion and gasification zones. The thermodynamic analysis shows that the exergetic effi-ciency of the fixed-bed gasifier is mainly determined by the oxygen/coal ratio. The exergetic efficiency of the proc-ess will reach an optimum value of 78.3%when the oxygen/coal and steam/coal mass ratios are 0.14 and 0.80, re-spectively.
Bibliography:Lurgi gasifier, gasification, syngas, pyrolysis, exergetic efficiency
HE Chang , FENG Xiao , Khim Hoong Chu, LI Anxue , LIU Yongjian （1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China 2 Honeychem, Nanjing Chemical Industry Park, Nanjing 210047, China ;3 Liaoning Datang International Fuxin Coal-To-SNG CO., LTD, Fuxin, China）
11-3270/TQ
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 composi-tion of syngas in the combustion and gasification zones. The thermodynamic analysis shows that the exergetic effi-ciency of the fixed-bed gasifier is mainly determined by the oxygen/coal ratio. The exergetic efficiency of the proc-ess will reach an optimum value of 78.3%when the oxygen/coal and steam/coal mass ratios are 0.14 and 0.80, re-spectively.
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ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(14)60066-5