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Synthesis of heat exchanger networks at subambient conditions with compression and expansion of process streams
Author(s) -
Wechsung Achim,
Aspelund Audun,
Gundersen Truls,
Barton Paul I.
Publication year - 2011
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12412
Subject(s) - exergy , heat exchanger , liquefaction , liquefied natural gas , process engineering , streams , process (computing) , natural gas , work (physics) , methane , environmental science , engineering , petroleum engineering , waste management , mechanical engineering , computer science , chemistry , geotechnical engineering , computer network , organic chemistry , operating system
This article presents an optimization formulation for the synthesis of heat exchanger networks where pressure levels of process streams can be adjusted to improve heat integration. Especially important at subambient conditions, this allows for the interconversion of work, temperature, and pressure‐based exergy and leads to reduced usage of expensive cold utility. Furthermore, stream temperatures and pressures are tuned for close tracking of the composite curves yielding increased exergy efficiency. The formulation is showcased on a simple example and applied to a case study drawn from the design of an offshore natural gas liquefaction process. Aided by the optimization, it is demonstrated how the process can extract exergy from liquid nitrogen and carbon dioxide streams to support the liquefaction of a natural gas stream without additional utilities. This process is part of a liquefied energy chain, which, supplies natural gas for power generation while facilitating carbon dioxide sequestration. © 2010 American Institute of Chemical Engineers AIChE J, 2011