Removal of Hydrogen Sulfide from Non-Condensable Geothermal Gas at

ABSTRACT: The non-condensable gas (NCG) from geothermal power plants can contain substantial amount of hydrogen sulfide, which has to be removed to meet environmental regulations in most location. However, in Iceland the NCG is emitted to the atmosphere without further treatment. In this paper, result of a master’s study on different methods to remove H2S from NCG at Nesjavellir geothermal power plant is published. Four processes for H2S removal from NCG were studied, namely: WSA, LO-CAT, THOPAQ, and Fe-Cl hybrid processes. The first three processes are prevalent processes, but the Fe-Cl hybrid process is a recently developed process. The processes pre-design cost estimates are compared in order to choose an economic process for H2S removal from NCG at Nesjavellir power plant. KEY WORDS: H2S, Nesjavellir, Geothermal gas, Fe-Cl hybrid process, 1