Geothermal Power

Geothermal power plants are environmentally attractive since they employ a renewable energy source. However, geothermal steam contains varying amounts of non-condensable gases (NCG) such as carbon dioxide (CO2), hydrogen sulfide (H2S), mercury vapor (Hg) and in some cases benzene (C6H6). Depending on the type of condenser employed the H2S will partition itself in various ratios between the condensate and the non-condensable gas (NCG). However, both the low odor threshold of H2S and the current environmental laws strictly limit the amount of H2S that may be vented into the atmosphere. In most populated areas this H2S must be removed from the NCG streams prior to venting.

Merichem’s LO CAT® technology is highly effective in removing H2S from geothermal NCG. The first application of the LO CAT® technology in a geothermal power plant application started up in 1988 and quickly led to several more installations in the United States, Philippines, and Indonesia.