Abstract

Abstract Cryogenic processes, including air separation and natural gas liquefaction, require tight heat integration. Multistream heat exchangers (MHEXs), typically of the plate-fin type, are a key enabler to this end. Developing MHEX models that lend themselves to flowsheet optimization calculations is challenging, especially when streams with phase change are present. In this paper, we present a methodology for equation-oriented, optimization-friendly MHEX modeling, using a pseudo-transient approach. We illustrate our developments with a natural gas liquefaction process case study.

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