炼厂低温热优化利用及其网络?分析评价

Optimization and network exergy analysis for utilization of low-temperature heat in refinery

从大系统的角度出发,为炼厂优化设计了全厂范围内的低温热系统,通过装置间的间接热联合,有效提高了低温热的利用率。通过详细设计和模拟计算低温热媒水网络的具体参数,有效回收利用92℃热媒458 t/h,回收热量达11.1 MW/h,该系统每月可为全厂节省低压蒸汽2 560 t。通过?效率分析评价对比,全厂低温热系统对热量的质量利用程度较高,?效率可达0.865。

In the view of large scale system,a plant-wide low-temperature heat system is designed optimally for a refinery,which improves the utilization of low temperature heat through strengthening the heat integration among the units.Based on the detailed design and the simulation calculation of concrete parameters in the low-temperature hot medium water network,458 t/h of 92℃ hot medium water or 11 MW/h of low-temperature heat are recovered effectively.This system can help this refinery to save 2,560 t of low pressure steam per month. It is verified through analysis,evaluation and comparison on exergy that the plant-wide low-temperature heat system exhibits a higher efficiency in utilization of heat,with an exergy efficiency of 0. 865.