Direct work exchanger network synthesis of isothermal process based on improved transshipment model

Abstract Research on work exchange between high and low-pressure streams to reduce consumption of relatively expensive mechanical energy has great significance for improving energy efficiency in chemical plants. A novel methodology for the synthesis of direct work exchanger network of isothermal process is first proposed in this article. It is developed based on an improved transshipment model in a linear programming formulation. Two heuristic strategies and six matching rules that explicitly assist identifying feasible match between high and low-pressure streams are proposed. The former strategy is to construct intermediate pressures of low-pressure streams for solving pressure constraints of stream matches. The latter one is applied to find more feasible matches for further reducing both utility consumption and the number of work exchangers. Compared with solutions gained by graphical integration method, the presented method is proved to be more efficient by two examples where specific utility consumption is reduced by 23.4% and 17.6%, respectively.

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