微机合成工业规模换热网络的新方法

分析了采用双最小换热温差合成换热网络的原理。基于允许能量穿越伪Pinch点进行冷热流股匹配而不会招致外供能量的增加,把网络作为一个整体进行合成,从而可减少换热单元个数和避免不必要的分流。本文提出了一种设计成本最低换热网络的计算机自动合成方法,能对工业规模的换热网络进行自动合成。实例研究表明,用新方法合成的网络,结构简洁,且其年总花费比用Pinch法得到的结果更接近预估目标值。

A New Method for Synthesis of Industrial Heat Exchanger Networks on a Microcomputer

A principle of synthesis of heat exchanger networks using dual approach temperatures has been investigated. According to this principle the excess energy is permitted to across the psuedo pinch point during synthesis without violating the minimum energy cosumption, therefore, to divide a pinched task at pinches into threshold subtasks is not necessary, and this will reduce the heat exchanger units and stream splits, makes the synthesized networks featuring simpler and cheaper. Based on above meantioned principle, an automatic computer algorithm is presented by authors, it can be applied to synthesize heat exchanger networks in industrial scale. The examples show that the networks synthisized by using authors' method are simpler and cheaper than the networks synthisized with pinch design method, and the annual costs of networks are very close to the cost targets.