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Appl. Sci. 2017, 7(6), 535; doi:10.3390/app7060535

Use of Rolling Piston Expanders for Energy Regeneration in Natural Gas Pressure Reduction Stations—Selected Thermodynamic Issues

Department of Thermodynamics, Theory of Machines and Thermal Systems, Faculty of Mechanical and Power Engineering, Wrocław University of Science and Technology, Wrocław 50-370, Poland
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Academic Editor: Antonio Ficarella
Received: 18 January 2017 / Revised: 18 May 2017 / Accepted: 20 May 2017 / Published: 23 May 2017
(This article belongs to the Section Energy)
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Abstract

Gas pressure reduction stations are commonly applied to decrease the pressure of natural gas in the transmission pipelines. In such stations, natural gas is expanded in throttling valves without producing any energy. Through the use of expander in natural gas pressure reduction stations, it is possible to recover the pressure energy of the natural gas during expansion, and drive the electrical generator. Possible solutions include turbines and volumetric expanders. However, turbines are complicated and expensive, while volumetric expanders are simple and cheap. This paper presents an analytical modeling of rolling piston expander work conditions when adopted to natural gas expansion. The main objective of this research was therefore a comprehensive analysis of influence of varied sizes of the expander components and natural gas thermal properties at the inlet and at the outlet of the expander, on the expander output power. The analysis presented in this paper indicates that the rolling piston expander is a good alternative to the turbines proposed for energy recovery in natural gas pressure reduction stations. View Full-Text
Keywords: rolling piston expander; volumetric machinery; waste energy recovery; renewable energy sources rolling piston expander; volumetric machinery; waste energy recovery; renewable energy sources
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MDPI and ACS Style

Kolasiński, P.; Pomorski, M.; Błasiak, P.; Rak, J. Use of Rolling Piston Expanders for Energy Regeneration in Natural Gas Pressure Reduction Stations—Selected Thermodynamic Issues. Appl. Sci. 2017, 7, 535.

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