基于经济目标和分解协调策略的换热网络最优设计

分析了换热网络在过程系统中的功能 ,从火用分析和火用经济学的角度提出了换热网络最优合成设计的实用火用经济目标函数 ,它包含了网络的流动火用损费 ,且可分解为各个换热单元的总费用之和 .在换热网络目标函数可分解性的基础上 ,本文又进一步提出了换热网络分解协调优化的研究策略 ,它是在各个匹配单元 (子系统 )和整个换热网络结构 (复杂系统 )之间进行优化协调 ,并获得换热网络的最优结构和各匹配单元的最优操作参数 .最后 ,通过一换热网络的最优合成 ,说明了该方法的应用前景

OPTIMAL DESIGN OF HEAT EXCHANGER NETWORKS SYNTHESIS BASED ON EXERGY-ECONOMIC OBJECT AND STRATEGY OF DECOMPOSITION AND COORDINATION

This paper analyses the function of heat exchanger networks(HEN) is a process system, and states the essence of energy evolvement and diversification in the process system The paper indicates that the optimal objective function of all of the previous methods expressed by the sum of cold utility and hot utility for the energy cost is not rational Actually, from the exergy analysis point, it is the exergy dissipation that drives the process of heat transfer The energy cost and its objective function should be expressed based on exergy analysis and exergy economics So,this paper presents the exergy economic objective function of HEN synthesis from exergy analysis and exergy economics,which contains the flow exergy dissipation of HEN Moreover,this paper proposes the optimal mathematical model and the procedure of HEN optimal synthesis, shows that the exergy economic objective function of HEN can be decomposed into the sum of overall cost of each match unit . The strategy of decomposition and coordination is proposed based on the resolvability of HENs exergy economic objective function, which is between optimization of network and optimization of match units The cost of flow exergy dissipation of HEN is considered simultaneously for HEN synthesis The method proposed in this paper can obtain not only the optimal structure of HEN but also the optimal operation parameters of each match unit Finally, a case study demonstrates the potential application of this method