Abstract:

In the design of water-using networks of multiple contaminants, there are two key steps: determining the process executing order and allocating the process streams.In this paper, a new concept, overall concentration potential of demand (OCPD)for the process stream is proposed.The OCPD of a stream reflects the concentration order of a stream compared to all the other streams (including both demand streams and source streams）.Compared to the concentration potential concept proposed by Liu et al(2009), OCPD can compare the concentration order of a demand stream and that of a source stream.In the design, the process executing order is determined by the values of OCPDs of the demand streams.The process with the lowest inlet OCPD is executed first.When satisfying a demand stream of the process being executed, the source stream with the largest quasi-allocation amount, which is defined in this paper, is used first.A few literature examples are investigated.The results show that the amounts of fresh water consumptions are very close to the minimum fresh water targets, the structures of the designs obtained in this work are not complex compared to that obtained in the literature, and the calculation of the proposed method is very simple.

Key words:

多杂质用水网络, 综合浓度势, 设计, 过程集成

摘要：

在多杂质用水网络设计中, 过程的执行顺序和水流之间的匹配是两个关键环节。提出了过程水流相对于其他各过程水流的综合浓度势的概念, 水流的综合浓度势反映了该水流与其他所有水流(包括源水流和需求水流)相比较时浓度的高低。设计时过程的执行顺序由需求水流综合浓度势的大小来确定, 需求水流综合浓度势最低的过程首先执行。在满足需求水流时, 优先回用虚拟分配量（用本文给出的方法确定）最大的可用源水流。源水流向需求水流的分配量可通过杂质负荷衡算及过程极限条件确定。计算实例表明, 本文方法获得的水网络的新鲜水消耗量与最小新鲜水目标值非常接近, 同时, 其计算十分简捷。

关键词:

多杂质用水网络, 综合浓度势, 设计, 过程集成