无分流换热网络的弹性设计(Ⅰ)基于温度波动情形

SYNTHESIS OF FLEXIBLE HEAT EXCHANGER NETWORKS WITH STREAM NO - SPLITTING(Ⅰ) BASED ON RANGES OF STREAM SUPPLY TEMPERATURES

提出了基于温度波动的无分流换热网络的超结构模型和同步优化的弹性设计方法。对于起始温度在一定范围内波动的物流进行预处理即分段处理,并提出了分段原则;提出了基于规则的网络超结构模型并建立了弹性换热网络同步优化的数学模型;采用遗传算法求解了所提出的优化数学模型;提出了分段物流的合并及能量松弛的原则,对分段物流进行合并,并通过能量松弛方法得到优化的弹性换热网络结构。通过几个换热网络的弹性设计,说明了本方法的有效性和应用前景。

This paper presents a new superstructure model of heat exchanger networks with stream no -splitting based on ranges of stream supply temperatures and the method of simultaneous optimal design of flexible heat exchanger networks synthesis. Firstly, the streams with ranges of supply temperatures are parted. Secondly, a superstructure model of heat exchanger networks is proposed based on rules, and the simultaneous optimal mathematical model of flexible heat exchanger networks synthesis is established. Thirdly, the genetic algorithm is applied to solving the mathematical model established at the second step effectively. Finally, the parting streams are merged and the load of heat exchanger is relaxed , and optimal flexible heat exchanger networks configuration can be obtained very easy. Some case studies demonstrate that the method is effective.