Comparing exergy losses and evaluating the potential of catalyst-filled plate-fin and spiral-wound heat exchangers in a large-scale Claude hydrogen liquefaction process
Journal article, Peer reviewed
Published version
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http://hdl.handle.net/11250/2640432Utgivelsesdato
2020Metadata
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Originalversjon
International journal of hydrogen energy. 2020, .Sammendrag
Detailed heat exchanger designs are determined by matching intermediate temperatures
in a large-scale Claude refrigeration process for liquefaction of hydrogen with a capacity of
125 tons/day. A comparison is made of catalyst filled plate-fin and spiral-wound heat exchangers
by use of a flexible and robust modeling framework for multi-stream heat exchangers
that incorporates conversion of ortho-to para-hydrogen in the hydrogen feed
stream, accurate thermophysical models and a distributed resolution of all streams and
wall temperatures. Maps of the local exergy destruction in the heat exchangers are presented,
which enable the identification of several avenues to improve their performances.
The heat exchanger duties vary between 1 and 31 MW and their second law energy
efficiencies vary between 72.3% and 96.6%. Due to geometrical constraints imposed by the
heat exchanger manufacturers, it is necessary to employ between one to four parallel
plate-fin heat exchanger modules, while it is possible to use single modules in series for the
spiral-wound heat exchangers. Due to the lower surface density and heat transfer coefficients
in the spiral-wound heat exchangers, their weights are 2e14 times higher than
those of the plate-fin heat exchangers.