Effects of gasification condition on the overall performance of methanol electricity polygeneration system

作     者：Qin, Zhen Bhattacharya, Sankar Tang, Kai Zhang, Zaoxiao 

作者机构：Xi An Jiao Tong Univ Sch Chem Engn & Technol State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Monash Univ Dept Chem Engn Clayton Vic 3800 Australia 

出 版 物：《ENERGY CONVERSION AND MANAGEMENT》 (能量转换与管理)

年 卷 期：2019年第184卷

页      面：362-373页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China [51876150, 21736008] China Scholarship Council 

主　　题：Polygeneration Coal gasification H/C ratio adjustment Energy efficiency Water consumption 

摘      要：The operating conditions of coal gasifier have significant effects on the overall system performance of an associated process. This study designs a methanol-electricity polygeneration system and presents a comprehensive discussion about the effects of the ratio of steam to coal, the ratio of O-2 to coal, the ratio of carrier gas (CO2) to coal and the CO2 concentration in methanol synthesis gas on different performance indicators. The results show that the steam/coal ratio has slight effects on the overall system performance due to the offset in different sections. An optimal O-2/coal ratio exists in the range of 0.84-0.86 to achieve the minimum unit water consumption and the maximum methanol production and energy efficiency, which is almost consistent with the range that the H-2 concentration in gasifier syngas reaches the maximum value. The amount of carrier gas CO2 and the CO2 concentration in methanol synthesis gas should be kept at a low level to just meet the requirements of coal pressurization and synthesis reaction. This comprehensive sensitivity analysis can provide some significant guidance for the system design.