Multi-stream Heat Exchanger Channel Arranged To Optimize The Design Study

Heat exchanger which is operated with a variety of fluid is an important equipment in the utility of energy system, and the fluids can transfer heat at the same time, not only experiment of equipment can be reduced, but also special process can be realized, so it is quite widely used in chemical engineering, oil refining, aviation, power mechanics, vehicles, electronics and other fields. Multi-stream heat exchanger is more compact in structure and more complex in heat exchanging process compared with Two-stream heat exchanger, and many new characteristics and problems are presented in flow and heat transfer. For example, the passage arrangement of cold and hot fluids a much more complex problem in the design process of Multi-stream heat exchanger, and there is not open sophisticated theories and methods at present.In this paper, a practical and reasonable optimization method for passage arrangement of multi-stream heat exchanger has been built, for improving the performance of the multi-stream heat exchanger, which was realized by Monte-Carlo Method and Simulated Annealing Method and based on structure and performance continuity principle of passage arrangement.Firstly, structure and performance continuity principle of multi-stream heat exchanger has been proposed from the performance continuity principle of the chemical process system. The theoretical validation of structure and performance continuity principle of multi-stream heat exchanger on passage arrangement has been done, and provided the primary theory proof for the next method's introduction.Then, global optimization of passage arrangement in the certain fluid organization based on heat transfer quality has been received by using the optimization method of passage arrangement of Monte-Carlo Random Sample Simulation Method, and realized the optimization design calculation of the multi-stream heat exchanger in the certain fluid organization.Based on the primary work, continuity sequence has been created: position changed sequence, subroutine sequence and M-decimal sequence. Performance continuity of heat exchanger under different sequences are analyzed, and a much better passage arrangement continuity sequence is received.At last, by using the created structure and performance continuity sequence, and introducing the simulated annealing method, the global optimization of multi-stream heat exchanger has been realized, and an applied, effective passage arrangement optimization method of multi-stream heat exchanger has been proposed.Above all, a new method of passage arrangement optimization of multi-stream heat exchanger was carved out in the paper, which combined the random sample simulation method and simulated annealing method, and got the relative optimization solution and global optimization solution of passage arrangement method of multi-stream heat exchanger, at the same time, put the heat exchanging capacity evaluation into the optimization process, and then built a practical and reasonable optimization method for passage arrangement of multi-stream heat exchanger...