热回收网络结构柔性的改进方法研究

IMPROVED STRUCTURAL FLEXIBILITY OF HEAT EXCHANGER NETWORKS

热回收网络结构柔性改进问题是针对在不确定参数下柔性不满足要求的网络,通过改造其结构以增加柔性,从而达到降低能耗之目的.本文在用网络柔性分析方法识别出控制网络柔性的关键变量的基础上,通过寻找不确定参数范围内的最坏操作点,对于关键变量为热负荷变量和温差变量两类情况,构造不同的等价结构.采用热负荷转移法、分流法和减少热负荷法等手段,有效地改进了热回收网络的结构柔性.

The problem of improving structural flexibility of heat exchanger networks is to retrofit the configuration of a heat exchanger network whose flexibility does not meet the requirement and enhance its flexibility, so as to decrease its energy consumption caused by uncertain parameters. In this paper the key variables for controlling flexibility of a heat exchanger network are identified by a flexibility analysis method. The worst operation point is established in the range of the uncertain parameters. Then two subproblems of temperature difference key variable and heat load key variable are solved to configure the corresponding e-quivalent structure, and the flexibility of the network can be efficiently improved, by using the strategies of shifting, splitting and decreasing heat load.