Steam generator and gas turbine unit with gas water heater - has main line from water condensate outlet to preheater condensate inlet line

摘要

Unit comprises a gas and water low-pressure heat exchanger (6), a low-pressure recuperative pre-heater (20, 21) of which part (21) is connected by a condensate line (29) in parallel with the heat exchanger, and means to prevent boiling of the condensate in the heat exchanger comprising a main line (31) at one end connected with the pre-heated condensate outlet (29') from the heat exchanger. The other end of this main line is connected with the condensate inlet line (29) into the preheater section (20) upstream of the section (21) which is parallel to the heat exchanger. The main line (31) may contain a pump (26) for returning the pre-heated condensate via the heat exchanger and a control valve (27) downstream of the pump.