Abstract
Considerable research effort has been reported in cost-optimal operation of heat exchanger network. However, most of them neglect the pressure drop influence and assume constant film heat transfer coefficients. Pressure drop of streams are important influencing factors for the performance of heat exchanger network operation. In this paper, a general cost-optimal operation model considering pressure drop constraints and removing the assumption of constant film heat transfer coefficients is proposed. It is necessary to determine the pumping power cost required as part of operating cost function. The extended model is applied to one example taken from previous research, and the results prove that the proposed method can obtain more real optimization results for HEN operational optimization problems.
Highlights
Large number of literatures has been done on heat exchanger network synthesis (HENS)
The synthesis methods have been developed successfully for HEN, there is no guarantee that minimum annual cost and flexibility can satisfy ideal target, since synthesis and detail design are not conducted in the same stage
Most HEN operation optimization procedures reported assume heat transfer efficient constant and do not consider the pressure drop aspects of the problem. It is well-known that heat transfer efficient and pressure drop are important factors influencing the performance of HEN
Summary
Large number of literatures has been done on heat exchanger network synthesis (HENS). Yee and Grossmann[1] proposed a mixed integer nonlinear programming (MINLP) model considering simultaneously utility cost, exchanger areas and selection of matches, which can explicitly handle the trade-off between the capital and running cost. Mathisen et al.[6] discussed bypass selection method of HEN for controlling all critical targets, without considering utility cost. Glemmestad et al.[7] proposed an optimal operation of HEN method considering both target temperatures and utility consumption minimized. Glemmestad et al.[9] presented robust optimal operation method of HEN considering self-optimizing control. The pumping cost resulting from pressure drop during HEN system is introduced into operation optimization model, based on stage-wise superstructure representation proposed by Yee and Grossmann. One simple example is studied to illustrate the proposed approach
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