大型复杂过程系统用能的诊断与调优

针对大型复杂过程系统用能的诊断与调优，发展了夹点分析（夹点技术）方法。提出采用虚拟温度法，确定各流股匹配换热的传热温差；将过程的夹点分析区分为操作型夹点计算与设计型夹点计算两个层次：操作型夹点计算用于过程用能的诊断；设计型夹点计算指导过程用能的调优。基于以上改进，开发了大型复杂过程系统用能诊断与调优策略，并应用于国内某厂乙烯装置的节能改造，可使该装置吨乙烯能耗降低４．１８７ＧＪ。应用表明本文提出的方法是指导大型复杂过程系统用能诊断与调优的有利工具。

Diagnosis and Evolution of Energy Utilization of Large Scale and Complex Process System

To diagnose and evolve energy utilization of large scale and complex process system,the work in this paper has developed Pinch Analysis (Pinch Technology) Method.The pseudo temperature method is used to determine the heat transfer approach temperature of each stream.Moreover,pinch calculation is classified into operating pinch calculation level and design pinch calculation level:operating pinch calculation can be applied to diagnosis of process energy utilization,design pinch calculation can direct evolution of process engergy utilization.Based on these improvements,the strategy is made which can help and direct process engineers to diagnose and evolve energy utilization of large scale and complex process system and has been applied to an existing ethylene plant retrofitting for reducing energy usage,and the profit is remarkable.The practice shows that the method put forward in this paper is an effective tool which can direct diagnosis and evolution of energy utilization of large scale and complex process system.