JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Feasibility Study of Pressure Letdown Energy Recovery from the Natural Gas Pressure Reduction Stations in South Korea
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Feasibility Study of Pressure Letdown Energy Recovery from the Natural Gas Pressure Reduction Stations in South Korea
Yoo, Han Bit; Hong, Seongho; Kim, Hyo;
  PDF(new window)
 Abstract
Almost all of the natural gas consumed in South Korea is compressed into very high pressure for the transportation through the underground pipelines, then reduced in pressure regulation stations before delivery to the consumer. For pressure reduction, expansion valves have been used due to the simple and effective installation, but recover none of the energy in the gas during compression. Hence, turbo-expanders are proposed instead of the valves to accomplish the same pressure letdown function and recover some of the compression energy in the form of shaft work converting into electric powers. Here we have theoretically calculated the electric powers at the pressure reduction from 68.7 bar to 23 bar (which are the average values taken at the inlet and outlet points of the expansion valve in medium-pressure regulation stations) according to the inlet conditions of temperature and flow rate. The natural gas is considered as two cases of a pure methane and the mixture of hydrocarbons with a very small amount of nitrogen, and the Peng-Robinson equation of state is employed for the calculation of required thermodynamic properties. The electric energy is recovered as much as 1596 MW(methane) and 1567 MW(mixture) based on the total supply of natural gas in 2013.
 Keywords
natural gas;turbo-expander;pressure reduction;energy recovery;thermodynamic properties;
 Language
Korean
 Cited by
1.
천연가스 유량변화에 따른 터보팽창기 감압시스템 운전 최적화에 관한 연구,유한빛;김효;

한국가스학회지, 2015. vol.19. 6, pp.72-79 crossref(new window)
 References
1.
Mirandola, A., and Minca, L., "Energy Recovery by Expansion of High Pressure Natural gas", Proceedings of the 21st Intersociety Energy Conversion Engineering Conference, 1, 16-21, (1986).

2.
Hedman, B. A., "Waste energy recovery opportunities for interstate natural gas pipelines", Interstate Natural Gas Association of America, (2008).

3.
Howard, C., Oosthuizen, P., and Peppley, B., "An investigation of the performance of a hybrid turboexpander fuel cell system for power recovery at natural gas pressure reduction stations", Applied Thermal Engineering, 31(13), 2165-2170, (2011). crossref(new window)

4.
Rahman, M. M., "Power generation from pressure reduction in the natural gas supply chain in Bangladesh", Journal of Mechanical Engineering, 41(2), 89-95, (2010).

5.
Ardali, E. K., and Heybatian, E., "Energy Regeneration in Natural Gas Pressure Reduction Stations by Use of Gas Turbo Expander; Evaluation of Available Potential in Iran", Proceedings 24th world gas conference, 5-9, (2009).

6.
Yoo, H. B., Kim, H., "Electricity Generation by Using Turbo-Expander in Natural Gas Pressure Reduction Stations in Republic of Korea", Proceedings of the Annual Fall Meeting of KIChE 2014, 273, (2014).

7.
Maric, I., "The Joule-Thomson effect in natural gas flow-rate measurements", Flow Measurement and Instrumentation, 16, 387-395, (2005). crossref(new window)

8.
Fattah, K. A. A., "Evaluation of Empirical Correlations for Natural Gas Hydrate Predictions", Oil and Gas Business, 55(11), 467-472, (2004).

9.
Peng, D. Y., and Robinson, D. B., "A New Two-Constant Equation of State", Ind. Eng. Chem. Fundamen., 15(1), 59-64, (1976). crossref(new window)

10.
Smith, J. M., Van Ness, H. C., Abbott, M. M., Introduction to Chemical Engineering Thermodynamics, 7th ed., McGraw-Hill, New York, (2005).

11.
Sandler, S. I., Chemical and Engineering Thermodynamics, 3rd ed., Wiley, New Jersey, (1998).