Design and Exergy Analysis for a Combined Cycle of Liquid/Solid $CO_2$ Production and Gas Turbine using LNG Cold/Hot Energy

  • Lee, Geun-Sik (School of Mechanical and Automotive Engineering, University of Ulsan)
  • Published : 2007.03.30


In order to reduce the compression power and to use the overall energy contained in LNG effectively, a combined cycle is devised and simulated. The combined cycle is composed of two cycles; one is an open cycle of liquid/solid carbon dioxide production cycle utilizing LNG cold energy in $CO_2$ condenser and the other is a closed cycle gas turbine which supplies power to the $CO_2$ cycle, utilizes LNG cold energy for lowering the compressor inlet temperature, and uses the heating value of LNG at the burner. The power consumed for the $CO_2$ cycle is investigated in terms of a solid $CO_2$ production ratio. The present study shows that much reduction in both $CO_2$ compression power (only 35% of the power used in conventional dry ice production cycle) and $CO_2$ condenser pressure could be achieved by utilizing LNG cold energy and that high cycle efficiency (55.3% at maximum power condition) in the gas turbine could be accomplished with the adoption of compressor inlet cooling and regenerator. Exergy analysis shows that irreversibility in the combined cycle increases linearly as a solid $CO_2$ production ratio increases and most of the irreversibility occurs in the condenser and the heat exchanger for compressor inlet cooling. Hence, incoming LNG cold energy to the above components should be used more effectively.



  1. Wallis, M. K. and Lucas, N. J. D., 1994, Economic global warmimg potentials, International Journal of Energy Research, Vol. 18, pp.57-62
  2. Block, K. and Turkenburg, W. C., 1994, $CO_2$ emission reduction by means of industrial CHP in the Netherlands, Energy Convers. Mgmt, Vol. 35, No.4, pp.317-340
  3. Chakma, A., Mehrotra, A. K. and Nielsen, B., 1995, Comparison of chemical solvents for mitigating $CO_2$ emissions from coal-fired power plants, Heat Recovery Systems & CHP, Vol. 15, No.2, pp.231-240
  4. Song, H. J., 1985, A study on the power generation technology utilizing LNG cold energy, Korea Electric Power Research Institute
  5. Kim, C. W., 1993, Performance analysis of power generation cycle using LNG cold energy, Ph. D. thesis, Seoul National University, Korea
  6. Lee, G. S., Chang, Y. S., Kim, M. S. and Ro, S. T, 1996, Thermodynamic analysis of extraction processes for the utilization of LNG cold energy, Cryogenics, Vol. 36, pp.35-40
  7. Lee, G. S. and Ro, S. T., 1998, Analysis of the liquefaction process of exhaust gases from underwater engine, Applied Thermal Engineering, Vol. 18, pp. 1243-1262
  8. Kim, T. S., Ro, S. T., Lee, W. I. and Kauh, S. K., 1999, Performance enhancement of a gas turbine using LNG cold energy, Journal of KSME(B), Vol. 25, No.5, pp.653-660
  9. Park, J. T., 1993, Production of $LCO_2$ and dry ice, Refrigeration and Air-conditioning Technology, April, Vol. 103, pp.62-67
  10. PROPATH Group, 1993, PROPATH: A Program Package for Thermophysical Properties, Version 8.1
  11. Seifritz, W., 1993, The terrestrial storage of $CO_2$-dry ice, Energy Convers. Mgmt, Vol. 34, No. 9-11, pp. 1121-1141
  12. Lee, G. S., 2000, Compression power and exergy analysis in a dry ice production cycle with 3-stage compression, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 12, No.6, pp.550-560
  13. Lee, G. S., 1999, Exergy analysis of a dry ice production cycle with cascade cooling, Proceedings of SAREK'99 Winter Annual Conference, Seoul, Korea, pp.299-306
  14. Lee, G. S., 2002, Thermodynamic design of gas turbine -liquid/solid carbon dioxide production cycle using LNG cold and hot energy, Proceedings of SAREK'2002 Winter Annual Conference, Seoul, Korea, pp. 581-587