Abstract
Abstract The natural gas liquefaction process is a cryogenic energy intensive process which requires a complex designed multi-stream heat exchanger (MHEX). In this study, we present a discrete model for the detailed design of a spiral wound heat exchanger (SWHX) used in the natural gas liquefaction process. The design model is derived by discretizing first principles heat equation inside the heat exchanger for multiple refrigerant streams and natural gas. The phase change (liquefaction or vaporization) process is modeled using complementarity constraints which are reformulated and solved as a NLP. The SWHX model is embedded and solved inside a flowsheet model with process constraints for feasible design operations. The optimization results show that the inclusion of detailed MHEX design inside process flowsheet models is imperative to obtain optimal solutions which can be achieved in actual process performance.
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