A Feasibility Study on the Mixed Refrigerant Composition in the Rankine Cycle Empowered by Cold Energy

Title & Authors
A Feasibility Study on the Mixed Refrigerant Composition in the Rankine Cycle Empowered by Cold Energy
Jeong, Moon; Cho, Eunbi; Hwang, Inju; Kang, Choonhyoung;

Abstract
The power generation system using cold energy, which evolves in a large amount during the vaporization process of the liquefied natural gas, was designed in favor of the Rankine cycle with a mixed refrigerant as the working fluid. In this study it is intended to identify the allowable limits of the working fluid composition in respect of equipment safety in the Rankine cycle-type power generation system driven by the cold energy. The thermodynamic properties of the working fluid, which is a hydrocarbon mixture, were calculated with the Peng-Robinson model. In the steady state simulation of the power generation system by using a commercial tool Aspen HYSYS, the feed conditions of LNG Test Bed Train No.1 along with some necessary assumptions were incorporated. The results indicated that deterioration of the mechanical performance of the equipment as well as its safety would be brought about if contents of $\small{C_2H_6}$ and $\small{C_3H_8}$ in the mixture become, respectively, too high or too low.
Keywords
Rankine Cycle;Working Fluid;Phase Change;Cold Energy;Process Simulation;
Language
Korean
Cited by
References
1.
Conti, J. J., Holtberg, P. D., Beamon, J. A., Napolitano, S. A., Schaal, A. M., and Turnure, J. T., 2013, "Annual Energy Outlook 2013," EIA, pp. 2-233.

2.
Jo, E. B., Jeong, M., Hwang, I. J., and Kang, C. H., 2015, "Performance Analysis of Direct Expansion and Organic Rankine Cycle for a LNG Cold Power Generation System," Transactions of the KSME, Vol. 3, Issue. 1, pp. 55-62.

3.
Sun, H., Zhu, H., Liu, F., and Ding, H., 2014, "Simulation and Optimization of a Novel Rankine Power Cycle for Recovering Cold Energy from Liquefied Natural Gas Using a Mixed Working Fluid," Energy, Vol. 70, pp. 317-324.

4.
Franco, A. and Casarosa C., 2015, "Thermodynamic analysis of direct expansion configurations for electricity production by LNG cold energy recovery," Applied Thermal Engineering, Vol. 78, pp. 649-657.

5.
Rankine W. J. M., 1893, "A manual of machinery and millwork, 7th ed.," Griffin & Company, London.

6.
Smith, J. M., Van Ness, H. C., and Abbott, M. M., 2005, "Introduction to chemical engineering thermodynamics, 7th ed.," McGraw-Hill.

7.
Sunnya, A., Solomonb, P. A., and Aparnaa, K., 2016, "Syngas production from regasified liquefied natural gas and its simulation using Aspen HYSYS," Journal of Natural Gas Science and Engineering, Vol. 30, pp. 176-181.

8.
Peng, D. Y., 1976, "A new two-constant equation of state," Industrial and Engineering Chemistry Fundamentals, Vol. 15, No. 1, pp. 59-64.

9.
Jeong, M., 2014, "Analysis of the Limited Composition for Mixed Refrigeration on LNG Cold Power Generation System," KSME, pp. 119-120.