THERMAL SCIENCE

International Scientific Journal

Debajyoti Roy Chowdhury

,

Nathuram Chakraborty

,

Swapan Chandra Sarkar

THERMODYNAMIC EFFICIENCY EVALUATION OF A LOW PRESSURE TURBO EXPANDER CRYOGENIC CYCLE BASED ON EXERGY ANALYSIS

ABSTRACT
Thermodynamic analysis, using the exergy or entropy methods, is usually carried out for better insight into the physical meaning of the losses encountered in a cryogenic plant. From the results of such analysis, it is possible to evaluate the individual efficiencies of the various processes and to identify those calling for an improvement. It is also possible to determine thermodynamic efficiency of the cycle as a whole. The technique involves determination of entropy changes or exergetic losses in each of the processes making up the cycle. Based on the exergy analysis, it has been possible to evaluate specific work requirement, overall thermodynamic efficiency, Specific cooling capacity, work requirement per kg of liquid nitrogen product and coefficient of performance of the turbo expander cryogenic cycle using hydrogen and helium as the refrigerant.
KEYWORDS
exergy analysis, turbo expander cycle, cryogenic, liquid nitrogen
PAPER SUBMITTED: 2017-04-06
PAPER REVISED: 2017-11-02
PAPER ACCEPTED: 2017-11-05
PUBLISHED ONLINE: 2017-12-03
DOI REFERENCE: https://doi.org/10.2298/TSCI170406230R
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 3, PAGES [2097 - 2106]
REFERENCES
  1. Ahern, J.E., The exergy method of Energy Systems Analysis, Wiley-Interscience, New York, USA, 1980.
  2. Kotas, T.J., Exergy method of thermal and chemical plant analysis, Chem. Eng. Res. Des., 64, (1980), pp. 212.
  3. Rosen, M.A., Second‐law analysis: approaches and implications, Int. J. Energy Res., 23, (1999), 5, pp. 415-429.
  4. Cengel, Y.A., Cerci, Y., and Wood, B., Second law analysis of separation processes of mixtures, In: Proceedings of the ASME advanced energy systems division, 1999, 39, pp. 537-543.
  5. Yong P.S., Moon, H.M., Yi, S.C., Exergy analysis of cryogenic air separation process for generating nitrogen, J. Ind. Eng. Chem., 8, (2002), 6, pp. 499-505.
  6. Acıkkalp, E., Yamik, H., Caner, N., Acikkalp, E., Energy and Exergy Evaluation of an Air Separation Facility: A Case Study, Sep. Sci. Technol., 49, (2014), pp. 2105-2113.
  7. Sapali, S.N., Raibhole, V.N., Exergy Analysis of Cryogenic Air Separation Unit Integrated with Biomass Gasifier. Proceedings of the World Congress on Engineering and Computer Science, WCECS, San Francisco, USA, 23-25 October, 2013, Vol II , pp. 621-625.
  8. Aspen PLUS version 2006.
  9. Wang, X., Wu, J., Meng, X., Bi, S., Paper ID: 446, The exergy analysis of NGE-MR natural gas liquefaction process, The 24th IIR International Congress of Refrigeration, ICR 2015, August 16 - 22 - Yokohama, Japan, 2015, pp.1-8.
  10. Yao, Li., Lige, T., Aijing, Z., Yunfei, X., Jianbiao, S., Huazhi, L., Li, W., Li, S., Exergy Analysis for Air Separation Process Under Off-Design Conditions, J. Energy Resour. Technol, 137, (2015), pp. 1-5.
  11. Yasuki, K., Akira, K., Tsuguhiko, N., Atsushi, T., A Novel Cryogenic Air Separation Process Based on Self-Heat Recuperation. Sep. Purif. Technol, 77, (2011), 3, pp. 389-396.
  12. Dong, H., Zhao, L., Zhang, S., Wang, A., Jiuju, Cai., Using cryogenic exergy of liquefied natural gas for electricity production with the Stirling cycle, Energy, 63, (2013), pp.10-18.
  13. Tuo, H., Yanzhong Li., Exergy Analysis of Combined Cycle of Air Separation and Natural Gas Liquefaction, Int. J. Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering, 5, (2011), 1, pp. 77-83.
  14. Banerjee, R., Narayankhedkar, K.G., Sukhatme, S.P., Exergy analysis of pressure swing adsorption processes for air separation, Chem Eng Sci, 45, (1990), 2, pp. 467-475.
  15. Agarwal, R., Woodward, D.W., Efficient cryogenic nitrogen generators: An exergy analysis, Gas Sep. Purif, 5, (1991), 3, pp.139-150.
  16. Van der Ham, L.V., Kjelstrup, S., Exergy analysis of two cryogenic air separation processes, Energy, 35, (2010), pp. 4731- 4739.
  17. Saravanan, M.,Saravanan, R., and Renganarayanan, S., Energy and exergy analysis of counter flow wet cooling towers, Thermal Science,12, (2008), 2, pp. 69-78.
  18. Morosuk, T., Nikulshin, R., and Morosuk, L., Entropy-cycle method for analysis of refrigeration Machine and heat pump cycles, Thermal Science, 10, (2006), 1, pp. 111-124.
  19. Wang, F., Fan, X.W., Chen, J., and Lian, Z.W., Energy and exergy analysis of heat pump using R744/R32 refrigerant mixture, Thermal Science, 18, (2014), 5, pp. 1649-1654.
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Thermodynamic efficiency evaluation of a low pressure turbo expander cryogenic cycle based on exergy analysis

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence