Comparative Analysis of Alternative Means for Removing Noncondensable Gases from Flashed-Steam Geothermal Power Plants:April 1999 - March 2000

Metadata Updated: August 29, 2017

This dataset corresponds to the final report on a screening study to compare six methods of removing noncondensable gases from direct-use geo-thermal 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. The report is available from NREL's publication database.

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Metadata Created Date August 29, 2017
Metadata Updated Date August 29, 2017

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Harvested from Energy JSON

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Resource Type Dataset
Metadata Created Date August 29, 2017
Metadata Updated Date August 29, 2017
Publisher National Renewable Energy Laboratory
Unique Identifier
KC Hallett
Maintainer Email
Public Access Level public
Bureau Code 019:20
Metadata Context
Schema Version
Catalog Describedby
Data Quality True
Format application/
Harvest Object Id 9a9f9bcc-cc49-41bf-9d63-2eb05d6c3b6f
Harvest Source Id 8d4de31c-979c-4b50-be6b-ea3c72453ff6
Harvest Source Title Energy JSON
Data Last Modified 2015-08-21T20:50:28Z
Program Code 019:000
Source Datajson Identifier True
Source Hash 6fc4cb3e60da26134398ea9c6d3e9792e001fecb
Source Schema Version 1.1

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