嵌入条件改变的配合法水回用网络优化

Matching water-using network design with condition alterations

当前对水回用网络的研究,主要集中于在用水过程情况确定条件下构造新鲜水量最低的用水网络,忽视了用水过程的变化性。本文以配合法构造用水网络,每一用水过程入水以新鲜水、低污染回用水和高污染回用水配合获得,使各过程进水流量比尽可能趋近1,各过程按出口极限浓度由低到高依次运算。该方法以过程为运算单元,所以可针对具体过程,通过即时修改可回用水的流量、浓度等运算参数实现条件改变下的用水网络构造,同时有利于实现用水网络的在线优化和成本控制。最后通过实例说明了该方法的有效性。

Up to now, the researches on water using network synthesis have mainly focused on minimizing freshwater consumption with the fixed condition of the water-using processes, ignoring the variability of the processes. To take the alterations into account, a method of matching water using network design with variable condition was presented. The water currents were classified into fresh, low-contaminant and high- contaminant, then were matched to the processes by considering the inlet limit conditions of the processes. The ratio of the actual and inlet limit flowrates should approach 1, and the processes should be ordered by the outlet limit contaminant concentration from low to high. The computing unit of the method is each process, so the alterations of the conditions can be considered by amending certain parameters, such as flowrate and contaminant concentration. On-line optimization and financial cost control can be made too. Finally, the advantage and effectiveness of the optimization method proposed were shown via a practical example.