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Bypass Selection for Control of Heat Exchanger Network

Chinese Journal of Chemical Engineering 2013年第3期21卷 276-284页

作者：孙琳罗雄麟侯本权白玉杰 Research Institute ofAutomatio_n. Chilaa University of Petroleum Beijing 102249 China Department of Chemical and Biological Engineering University of Bntish Columabial Vancouver BC V6T1Z3Canada

Considering the flexibility and controllability of heat exchanger networks (HENs), bypasses are widely used for effective control of process stream target temperatures. However, the optimal location for the bypass is generally difficult to design with the trade-off between controllability and capital investments. In this paper, based on the steady-state model of heat exchanger networks the optimal bypass location was firstly selected by iteratively calculating the non-square relative gain array (ns-RGA). To simplify the calculation process, rules of bypass selection were also proposed. In order to evaluate this method, then, the structural controllability of heat exchanger networks was analyzed. With both the consideration of the controllability and capital investments, the bypasses locations were finally selected. A case study on the HEN in Crude Distillation Unit was presented in which the ns-RGA and structural controllability were used to select bypasses and also to evaluate the results.

关键词： heat exchanger networks bypass process control non-square relative gain array structural control- lability

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