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

doi:10.1016/S1004-9541(14)60066-5

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (5): 522-530.DOI: 10.1016/S1004-9541(14)60066-5

• 催化、动力学与反应工程 • 上一篇下一篇

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

何畅¹, 冯霄¹, Khim HoongChu², 李安学³, 刘永健^1,2

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

收稿日期:2012-10-15 修回日期:2013-08-03 出版日期:2014-05-28 发布日期:2014-05-06
通讯作者: FENG Xiao,E-mail: xfeng@cup.edu.cn
基金资助:
Supported by the National Basic Research Program of China (2012CB720500) and the National Natural Science Foundation of China (U1162121).

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

HE Chang¹, FENG Xiao¹, Khim Hoong Chu², LI Anxue³, LIU Yongjian^1,2

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

Received:2012-10-15 Revised:2013-08-03 Online:2014-05-28 Published:2014-05-06
Supported by:
Supported by the National Basic Research Program of China (2012CB720500) and the National Natural Science Foundation of China (U1162121).

摘要/Abstract

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.

关键词: Lurgi gasifier, gasification, syngas, pyrolysis, exergetic efficiency

Abstract: 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.

Key words: Lurgi gasifier, gasification, syngas, pyrolysis, exergetic efficiency

何畅, 冯霄, Khim HoongChu, 李安学, 刘永健. Industrial-scale Fixed-bed Coal Gasification：Modeling, Simulation and Thermodynamic Analysis[J]. Chinese Journal of Chemical Engineering, 2014, 22(5): 522-530.

HE Chang, FENG Xiao, Khim Hoong Chu, LI Anxue, LIU Yongjian. Industrial-scale Fixed-bed Coal Gasification：Modeling, Simulation and Thermodynamic Analysis[J]. Chin.J.Chem.Eng., 2014, 22(5): 522-530.

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

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

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