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Analysis of a power cycle based on cold energy of liquefied natural gas and low-grade heat source.

Author(s) : WANG Q., LI Y., WANG J.

Type of article: Article

Summary

The authors developed a power cycle with natural gas directly expanding based on the cold energy of LNG and a low-grade heat source. Some parameters of the cycle have been investigated. The results indicate that the temperature of low-grade heat source, the condensing temperature of second medium, and the inlet pressure of the turbine are the key factors affecting the thermal and exergy efficiencies of the power cycle. The thermal and exergy efficiencies will be improved by increasing the temperature of the low-grade heat source, decreasing the condensing temperature and increasing the inlet pressure of the turbine. The thermal efficiency and exergy efficiency of the power cycle will be above 30% and 40%, respectively, after optimizing the key parameters. In order to further improve the utilizing efficiency of low-grade heat source, a regenerative power cycle has been put forward and analysed. The results show that under the same conditions the thermal and exergy efficiency of the power cycle increase 3-5%.

Details

  • Original title: Analysis of a power cycle based on cold energy of liquefied natural gas and low-grade heat source.
  • Record ID : 2004-2093
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 24 - n. 4
  • Publication date: 2004/03

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