Abstract: Effective utilization of water and energy is the key factor of sustainable development in
process industries, and also an important science and technology problem to be solved in
systems engineering. In this paper,two new methods of optimal design of water utilization
network with energy integration in process industries are presented, that is, stepwise and
simultaneous optimization methods. They are suitable for both single contaminant and multi
-contaminant systems, and the integration of energy can be carried out in the whole process
system, not only limited in water network, so that energy can be utilized effectively. The
two methods are illustrated by case study.

Key words: utilization of water and energy, minimization, stepwise optimization method, simultaneous optimization method

摘要： Effective utilization of water and energy is the key factor of sustainable development in
process industries, and also an important science and technology problem to be solved in
systems engineering. In this paper,two new methods of optimal design of water utilization
network with energy integration in process industries are presented, that is, stepwise and
simultaneous optimization methods. They are suitable for both single contaminant and multi
-contaminant systems, and the integration of energy can be carried out in the whole process
system, not only limited in water network, so that energy can be utilized effectively. The
two methods are illustrated by case study.

关键词: 工业过程;最佳化设计工艺;水;能源;利用;炼油厂