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Cascaded steam and organic Rankine cycles with screw expanders.

Number: pap. 2330

Author(s) : TANG Y.

Summary

Low pressure saturated steam exists in a lot of industries. The recovery of the energy from the low pressure saturated steam can save tremendous power consumption for those industries. Although the Rankine cycle with a steam turbine can be used to generate the power from the low pressure saturated steam, the isentropic efficiency of the steam turbine is low, the reliability is questionable due to the two phase expansion, and the size is typically large due to the low pressure. This paper presents a system in which steam Rankine cycle and organic Rankine cycle are cascaded to achieve the maximum thermal efficiency. In the cascaded steam and organic Rankine cycles, the organic Rankine cycle is used to condense the exhausted wet steam from the steam expander and at the same time to generate the power by use of the latent heat of the steam. An oil free screw expander is used for the saturated steam expansion, as it is more suitable for the application than a steam turbine and its isentropic efficiency is much higher than a steam turbine too. In addition, a lubricated screw expander is used for the refrigerant vapor expansion in the organic Rankine cycle. A real application case is presented together with the measured performance data from the installation site. For the steam with the saturated pressure of only 0.4 MPa (g), the cascaded steam and organic Rankine cycles achieved the thermal efficiency of 15.6%.

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Pages: 6 p.

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Details

  • Original title: Cascaded steam and organic Rankine cycles with screw expanders.
  • Record ID : 30013348
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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