Boosting Energy Efficiency Using Waste-Heat-Powered Absorption Chillers
- Sahil Popli (The Petroleum Institute) | Peter Rodgers (The Petroleum Institute) | Valerie Eveloy (The Petroleum Institute) | Saleh Al Hashimi (The Petroleum Institute) | Reinhard Radermacher (University of Maryland) | Yunho Hwang (University of Maryland)
- Document ID
- Society of Petroleum Engineers
- SPE Projects, Facilities & Construction
- Publication Date
- December 2011
- Document Type
- Journal Paper
- 232 - 238
- 2011. Society of Petroleum Engineers
- 4.6 Natural Gas, 4.1.4 Gas Processing, 4.1.6 Compressors, Engines and Turbines
- Natural Gas Processing, Waste Heat Recovery, Waste Heat Utilization, Energy recovery, Absorption cooling
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- 305 since 2007
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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.
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