Comparative analysis of alternative means for removing noncondensable gases from flashed-steam geothermal power plants

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This is a final report on a screening study to compare six methods of removing noncondensable gases from direct-use geothermal steam power plants. This report defines the study methodologies and compares the performance and economics of selected gas-removal systems. Recommendations are presented for follow-up investigations and implementation of some of the technologies discussed. The specific gas-removal methods include five vacuum system configurations using the conventional approach of evacuating gas/vapor mixtures from the power plant condenser system and a system for physical separation of steam and gases upstream of the power turbine. The study focused on flashed-steam applications, but the results ... continued below

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Vorum, M. & Fitzler, E. June 20, 2000.

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Description

This is a final report on a screening study to compare six methods of removing noncondensable gases from direct-use geothermal steam power plants. This report defines the study methodologies and compares the performance and economics of selected gas-removal systems. Recommendations are presented for follow-up investigations and implementation of some of the technologies discussed. The specific gas-removal methods include five vacuum system configurations using the conventional approach of evacuating gas/vapor mixtures from the power plant condenser system and a system for physical separation of steam and gases upstream of the power turbine. The study focused on flashed-steam applications, but the results apply equally well to flashed-steam and dry-steam geothermal power plant configurations. Two gas-removal options appear to offer profitable economic potential. The hybrid vacuum system configurations and the reboiler process yield positive net present value results over wide-ranging gas concentrations. The hybrid options look favorable for both low-temperature and high-temperature resource applications. The reboiler looks profitable for low-temperature resource applications for gas levels above about 20,000 parts per million by volume. A vacuum system configuration using a three-stage turbocompressor battery may be profitable for low-temperature resources, but results show that the hybrid system is more profitable. The biphase eductor alternative cannot be recommended for commercialization at this time.

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  • Other Information: PBD: 20 Jun 2000

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  • Report No.: NREL/SR-550-28329
  • Grant Number: AC36-99GO10337
  • DOI: 10.2172/758765 | External Link
  • Office of Scientific & Technical Information Report Number: 758765
  • Archival Resource Key: ark:/67531/metadc711728

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 20, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 31, 2016, 2:12 p.m.

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Vorum, M. & Fitzler, E. Comparative analysis of alternative means for removing noncondensable gases from flashed-steam geothermal power plants, report, June 20, 2000; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc711728/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.