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使用了(火用)热力学分析方法,对以煤和天然气为原料的单、多原料系统内部各单元及系统整体的(火用)效率进行了分析,研究了以煤和天然气为原料的单、多原料系统的优劣以及限制这类系统(火用)效率提升的关键因素,以期找出理论上最节能的工艺路线并为(火用)效率的改善指明方向.结果表明:煤气化单元是造成系统(火用)效率较低的主要原因,故煤气化单元的改进对提高系统整体的(火用)效率意义重大;考虑了“元素互补”和“能量互补”的以煤和天然气为原料的多原料系统,由于降低了气化单元的(火用)损失同时减少了天然气转化单元的燃料气用量,使得这类多原料系统的(火用)效率远优于其他方案,是真正节能的工艺技术路线.“,”The exergy efficiency of the single unit and the whole system of the single and multi-feed system with coal and natural gas as raw materials was analyzed by using the thermodynamic analysis method.The advantages and disadvantages of the single and multi-feed system with coal and natural gas as raw materials were studied as well as key factors that limit the exergy efficiency of such systems.The aim is to find the most technologically efficient process route and to specify the direction for improvement in exergy efficiency.The results show that the coal gasification unit is the main reason for the low exergy efficiency of the system.Therefore,the improvement of the coal gasification unit is of great significance to improve the exergy efficiency of the whole system.Considering the “elemental complementarity” and “ energy complementary” coal and natural gas as the raw material of the multifeed system,due to reduce the gasification unit loss while reducing the amount of fuel natural gas,the multi-feed system efficiency is far superior to other programs,and is the real energy-saving technology process.