Abstract: Water is a key element for the normal functioning of the industry and the society,which is now gravely concerned about.Though the purpose of water-using network (WUN) synthesis is to reduce the freshwater consumption and the wastewater discharge,the network reliability is worth considering for the sake of reducing the repair and maintenance cost so as to reduce the total annual cost.The WUN design has a significant impact on reliability issues.So the issue discussed in this paper is to integrate the reliability analysis into the WUN synthesis problem.The first step is to determine the reliability of the water-using system.Divide the whole system into possible subsystems,which means that the whole system maybe include one or more different subsystems.The reliability of WUN is evaluated in terms of the subsystems.For subsystem whose degree of reliability fails to meet the process specification,the dividing of the system is not accepted.Then the minimum freshwater requirement should be considered.A non-linear programming mathematical model is established to solve the problem.Take all the accepted situations into consideration.Choose the one that consumes the minimum freshwater.At last,an example is used to illustrate the application of the proposed method.The degree of reliability of the system is 0.904 which meets the process specification and the minimum freshwater is 142.88 t·h^-1 with 2.27% increasing compared to the situation which takes no consideration of reliability.This result means this method is effective and could be accepted by industry.

Key words: water using network, reliability, degree of reliability, analytic hierarchy process

摘要： 由于水资源的有限性，用水网络的优化设计问题一直是研究热点。可靠性问题关系着安全生产并且和实际生产有着直接的经济联系，也越来越受到关注。这里提出基于可靠性分析的用水网络优化设计方法，应用多目标优化方法中的层次分析法，首先满足用水系统可靠性要求，在满足可靠性基础上优化用水网络，从而使最终的用水网络满足可靠性要求且新鲜水用量最小。计算实例表明了该方法的有效性。

关键词: 用水网络, 可靠性, 可靠度, 层次分析法