Journal
JOURNAL OF PIPELINE SYSTEMS ENGINEERING AND PRACTICE
Volume 13, Issue 4, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)PS.1949-1204.0000673
Keywords
Liquefied natural gas (LNG); Turboexpander; Gas pipeline; Pressure drops; Power generation
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This study investigates the possibility of using turboexpanders instead of throttle valves for energy recovery in gas pressure-reduction stations. It finds that power generation and LNG production are the best cases for energy recovery in this context.
In this study, the possibility of installing turboexpanders instead of throttle valves was investigated and analyzed using Aspen HYSYS and Aspen Capital Estimator version 12.1. The optimization and energy saving cases were studied for maximum power or electrical energy generation as well as liquefied natural gas (LNG) production. Three case studies with various refrigeration cycles were evaluated according to economic considerations. It was found that the cases of power generation and LNG production were the best cases for energy recovery in gas pressure-reduction stations. The capital cost and rate of return (ROR) of this process were $232.2 million and 75%, respectively. The employed technique and developed process can be used for the optimization of energy in gas pressure-reduction stations.
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