51316-7568-Corrosion Testing in Gas-Separation Station at Hellisheidi Geothermal Power Plant in Iceland

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Product Number: 51316-7568-SG

ISBN: 7568 2016 CP

Author: Sigrun Karlsdottir

Publication Date: 2016

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Geothermal power plants are considered to be environmentally attractive because with them renewable energy source can be utilized. But geothermal steam contains non-condensable gases (NCG) such as carbon dioxide (CO2) and hydrogen sulfide (H2S) which may cause environmental safety and health problems if they are not disposed correctly. H2S emission from power plants in Iceland has now become a problem due to new stricter legislation in Iceland regarding air quality. A gas-separator station has been built at the Hellidheidi geothermal power plant in Iceland as a pilot plant for a project that involves separating the non-condensable gases H2S and CO2 from other NCG such as H2 N2 and CH4 in a gas-separation station and injecting them dissolved in separated geothermal water into a reinjection well and into the bedrock. Earlier pilot plant had major problems due to corrosion because of poor material selection. Corrosion testing was carried out to study the corrosion behavior of various materials in the new gas-separator station at Hellisheidi power plant. 316 L wasof particularinterest since it was the main construction material of the new station but carbon steel UNS S31254 and S31803 was also included for comparison. Both stressed U-bent specimens and corrosion coupons were placed inside the mixing zone of the gas-separator for 4 and 12 weeks. Weight loss measurements and microstructural and chemical composition analysis of the samples after testing was performed and the results are the topic of this paper.