换热器结垢与换热网络裕量设计方法研究进展

从结垢现象影响换热系统正常运行的角度出发,介绍了近几年换热网络裕量设计以及针对结垢问题不同学者研究出的换热网络优化设计。总结了在换热网络设计中对换热器清洗时序、清洗周期优化或者增加换热网络的裕量设计的不同换热网络设计最优方法,但这些方法都是在换热网络设计之初,考虑换热器结垢最严重的情况即换热网络在“最差”工况下进行的优化,因此优化得到的换热网络难以保证换热网络全运行周期的持续节能优化。本文结合现有换热网络设计方法的利弊,针对结垢过程的慢时变、持续特点,提出一种基于长周期持续节能的换热网络设计优化方法,在换热网络设计之初,定量分析结垢对网络结构的影响,以换热网络全周期累积总费用为目标函数,实现换热网络的最优综合。

Research advances in heat exchanger fouling and heat exchanger network(HEN) overdesign method

Fouling resistance affects normal operation of heat exchanger network(HEN). The present paper introduced the HEN margin designs and the HEN optimal design by considering fouling resistance. Some methods on cleaning time or optimal cleaning cycles for heat exchangers or synthesis of heat exchanger networks with flexibility and controllability were summarized. However,these HEN designs were obtained when HEN was in the worst conditions,so it is generally not optimal. This paper proposes the synthesis of multi-pass heat exchanger network based on life cycle saving by considered the existing HEN design methods and the slow time-­varying and continuous features of fouling. Finally,the optimal HEN results of accumulative total cost were obtained.