中文摘要：

在所建立的以二甲醚和电力为主要目标产品并副产甲醇的多联产系统流程基础上,以化工产品产率优化及二氧化碳减排为目的,以甲醇当量产率、二甲醚产量和CH4/CO2转化率作为全流程优化的目标函数,对包括CH4/CO2催化重整单元和二甲醚（甲醇）合成单元在内的两个关键单元流程进行整体优化处理,同时分析了一步法二甲醚合成反应体系间的协同作用,得到了重整反应器和合成反应器的优化操作参数和最佳焦炉煤气与气化煤气进料流量比。

英文摘要：

Oxy-fuel（alcohol,DME,etc.）is the main chemical product of the coal-based polygeneration system.In this system,25%（vol）methane in the coke-oven gas is reformed with 23%（vol）CO2 in the gasified gas,and the syngas at a proper H/C ratio is further changed to oxy-fuel.It is a system with energy-saving and friendly environment.The synthesis of oxy-fuel is the key unit for determining the efficiency and economics for the polygeneration system.In this study,Aspen Plus software was employed to establish an integrated coal-based polygeneration flowsheet.In the simulation,the equivalent yield of methanol and conversion of CH4 and CO2 were used as the objective functions for optimizing the operation parameters in the whole polygeneration system.Furthermore,the synergetic effect in the one-step DME synthesis process was investigated.