GT-OTSG. The steam-assisted gravity drainage recovery technique we use at our Surmont facility requires the production of steam using large boilers called once-through steam generators, or OTSGs. Gas turbine once-through steam generators, or GT-OTSGs, integrate natural-gas powered turbines with the OTSGs in order to produce electricity at the
Read MoreOnce-through steam generator (OTSG) A specialized type of HRSG without boiler drums is the once-through steam generator. In this design, the inlet feedwater follows a continuous path without segmented sections for economizers, evaporators, and superheaters.
Read MoreAbout OTSG. Once Through Heat Recovery Steam Generators (OTSGs) are the most significant advancement in steam generation in over a century. Until the 1980s, conventional drum boilers were used to produce steam. At about this time, the US Navy investigated the use of combined gas turbine and steam turbine plants for additional ship propulsion power.
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