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Posted by Tony Conner on April 04, 2002 at 04:55:42:
In Reply to: Steam in the boiler posted by Chris on April 03, 2002 at 21:14:38:
Large units like those in central stations send steam back to re-heat sections in the boilers to jack up the superheat after the steam has expanded in the high pressure turbine section. (This is another superheater section in the boiler.) It then goes back to the intermediate and then low pressure turbines, before being condensed. In some arrangements, the shafts of each turbine sections are coupled together to make one long unit, driving a single generator. This is like several engines coupled together, pulling a freight train. There's another (older style) arrangement where the HP tubine section drives a generator, the steam returns to the boiler for reheat, then goes to separate IP and LP sections (coupled together) driving a second generator.