关键词: 柔性换热器网络, 系统可靠性, 连接矩阵, 不相关子系统, 解耦

Abstract: On the basis of pseudo-temperature enthalpy diagram and genetic/simulated annealing algorithms (GA/SA), an optimization method with system level reliability analysis was presented for flexible heat exchanger network (HEN). Flexible arrangements of HEN were obtained via pseudo-temperature enthalpy diagram scheme, the connections of heat exchangers and independent subsystems in the HEN were analyzed by the connection matrix, then the system level reliability was measured by the independent subsystem that included maximum quantity of heat exchangers in the HEN. As for the HEN that didn’t meet system level reliability, the heat exchanger (HEX) connected most extensively with other HEX was deleted to decouple the HEN, and the independent subsystems in the HEN were changed, therefore system level reliability was increased. Heat duty redistribution based on the relevant elements of the heat load loops and HEX areas were then calculated in genetic/simulated annealing algorithms (GA/SA). Then the favorable network configurations which matched economical measurement were located. The proposed method can promote the system level reliability to reach the design tolerance, thus can be suitable for flexible HEN synthesis that includes system level reliability. Computational examples proved the effectiveness and feasibility of the proposed method.

Key words: flexible HEN, system level reliability, connection matrix, independent subsystem, decoupling