Abstract:

Based on the logic expression of Petri Net and its dynamic and concurrent characteristics，optimization modules were established for the minimum heat transfer temperature difference，analysis and synthesis of pinch design.First，with the excitation rule of Petri Net and vertical heat transfer，the minimum temperature difference was optimized.Secondly，data was transferred in the modules according to the arithmetic mechanism of Petri Net，so that the pinch point，the maximum heat recovery，the minimum loads of cold and hot utility were determined.Then，the initial heat exchanger network was synthesized based on the heuristic feasible rules for pinch design and the supervision mechanism of Petri Net.Finally，an evolutionary heat exchanger network was obtained by loop fracture and path relaxation according to the self-organizing mechanism of the Petri Net.An example was presented to demonstrate the validity and advantages of the proposed approach.