Taking the sintering waste heat utilization system of a steel corporation as an example, a general mathematical model of exergy efficiency for the entire thermodynamic system was established. The results of an exergy analysis calculated with the field test data show that the running exergy efficiency is only about 4.6%. In this consideration, the idea of grade recovery and cascade utilization of waste heat of sintering system was proposed,and the dual pressure waste heat power generation system was used for waste-heat power recycle based on the exergy analysis of sintering gas. It results in an increase of exergy efficiency by 2~4 times of the original efficiency, and the waste heat utilization is improved greatly. The research results provide scientific basis for the entire sintering system's design and reformation.%以某厂烧结余热利用系统为例,建立整个热力系统的一般性(火用)效率数学模型,根据现场测试的数据进行(火用)分析,结果表明,系统的实际运行(火用)效率只有4.6％左右;提出了烧结系统的余热分级回收和阶梯利用原则,通过对烧结烟气的(火用)分析,采用双压余热发电系统对余热进行动力回收,使(火用)效率达到原来的2～4倍,极大地提高了余热利用率,研究结果可为整个烧结系统的设计与改造提供较为科学的依据.
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