SPE Projects, Facilities & Construction
Volume 6,
Number 4,
December 2011,
pp. 232-238
Summary
The oil and gas industry is under increasing pressure to improve the
efficiency of its energy-intensive oil- and gas-processing operations through
improved energy use and waste-heat recovery. This paper explores the use of
waste-heat-powered absorption cooling to boost the efficiency of natural-gas
(NG) processing, enhance hydrocarbon recovery, and reduce utility cost in an NG
plant. A thermodynamic analysis of a gas turbine waste-heat-powered
double-effect water/lithium bromide (H2O/LiBr) absorption chiller in
an integrated NG plant is presented.It is found that waste heat recovered from
turbine exhaust gases could be used to provide enhanced process cooling
capacity to the NG plant through absorption cooling. The results suggest that
adouble-effect LiBr absorption chiller utilizing 34.6 MW of gas-turbine exhaust
heat could provide 45 MW of cooling at 5°C.This could save approximately 9 MW
of electric energy required by a typical compression chiller, while providing
an equivalent amount of cooling.The associated annual savings are estimated to
be approximately USD 7.8 million/yr, with a payback period of 2 years.
© 2011. Society of Petroleum Engineers
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History
- Original manuscript received:
15 September 2010
- Meeting paper published:
1 November 2010
- Revised manuscript received:
16 December 2010
- Manuscript approved:
21 January 2011
- Published online:
16 November 2011
- Version of record:
16 December 2011
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