基于虚拟温度法的间歇过程换热器网络综合

Heat exchanger network synthesis based on the pseudo-temperature for batch processes

提出了基于时间段模型(TSM)综合间歇过程换热器网络的方法,用虚拟温度法代替传统的单一最小传热温差,将各流股的温差贡献值作为决策变量,年度总费用最小作为目标函数建立数学模型。应用遗传膜拟退火算法对上述数学模型进行求解,分别获得每个时间间隔内的子换热器网络结构,并进一步对总换热器网络做结构优化,使其既满足流股的换热要求,又满足年费用最小。方法应用于实例计算,结果比基于最小传热温差获得的换热器网络年度总费用节省6.0%,换热器减少5台,说明这种方法既节省费用,又简化了网络结构。

A method based on Time Slice Model （TSM） is proposed for batch processes heat exchanger network synthesis by taking place heat recovery approach temperature with pseudo-temperature. The heat transfer temperature difference contribution value of each stream and minimum annual total cost is respectively regarded as the decision variable and objective function. By resolving this program using parallelized GA/SA, the heat exchanger network for each time interval can be achieved. Then, a further structural optimization is needed for the final network to meet the requirements of the heat exchange and minimum annual cost. The network of one example synthesized by proposed method saves 6.0% annual cost and 5 exchangers compared with the network based on heat recovery approach temperature. The result shows that, this approach is not only cost savings but also can simplify the network structure.