This paper presents a new design method for water and heat networks with single contaminant. The water network is designed first based on the concentration and temperature of water-using processes. Then, the thermal information of water streams in the water network can be used to design the corresponding heat network. The results of the illustrated examples show that the designs obtained in this work are comparable with those obtained in the literature with mathematical programming methods. The network structure obtained by using the proposed method is simple.
Based on an existing pressure-swing distillation process for tetrahydrofuran recovery, heat integration system is investigated in which the condenser of the high-pressure column is integrated with the reboiler of the low-pressure column. Rigorous simulations for the base case and the retrofitted one are carried out with the commercial software ASPEN PLUS. Simulation results show that the integrated structure is feasible, and the energy consumption is reduced by 33.31% compared with the base case. Meanwhile, the product purity is increased in the integrated structure.
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