A1 Journal article (refereed), original research

Thermodynamic and turbomachinery design analysis of supercritical Brayton cycles for exhaust gas heat recovery


Open Access publication

Publication Details
Authors: Uusitalo Antti, Ameli Alireza, Turunen-Saaresti Teemu
Publisher: Elsevier
Publication year: 2018
Language: English
Related Journal or Series Information: Energy
Journal acronym: Energy
Volume number: 167
Start page: 60
End page: 79
Number of pages: 20
ISSN: 0360-5442
eISSN: 1873-6785
JUFO-Level of this publication: 3
Open Access: Open Access publication
Location of the parallel saved publication: URN:NBN:fi-fe201903138725

Abstract

Significant amount of energy is wasted in engine systems as waste heat.
In this study, the use of supercritical Brayton cycles for recovering
exhaust gas heat of large-scale engines is investigated. The aim of the
study is to investigate the electricity production potential with
different operational conditions and working fluids, and to identify the
main design parameters affecting the cycle power production. The
studied process configurations are the simple recuperated cycle and
intercooled recuperated cycle. As the performance of the studied cycle
is sensitive on the turbomachinery design and efficiencies, the design
of the process turbine and compressor were included in the analysis.
Cycles operating with CO2 and ethane resulted in the highest
performances in both the simple and intercooled cycle configurations,
while the lowest cycle performances were simulated with ethylene and
R116. 18.3 MW engine was selected as the case engine and maximum
electric power output of 1.76 MW was simulated by using a low compressor
inlet temperature, intercooling, and high turbine inlet pressure. It
was concluded that working fluid and the cycle operational parameters
have significant influence not only on the thermodynamic cycle design,
but also highly affects the optimal rotational speed and geometry of the
turbomachines.


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Last updated on 2019-25-06 at 13:03