Claims
- 1. A steam turbine heat recovery system for recapturing heat energy at a final stage moisture removal zone of a low pressure turbine, the turbine including at least one higher pressure moisture removal zone and a condenser for condensing exhaust steam from the turbine into feedwater to be returned to a boiler, the system including a condensing drain cooling heater having a condensing section and a drain cooling section, a first plurality of heat exchanger tubes extending through said condensing section and a second plurality of heat exchanger tubes extending through said drain cooling section, feedwater from said condenser being pumped through each of said first and second plurality of tubes, higher pressure moisture from said higher pressure removal zone flowing through said condensing section for transferring heat therefrom to feedwater in said first plurality of tubes while being converted to condensate, said condensate flowing into said drain cooling section, inlet means coupled between said drain cooling section and said final stage removal zone for flowing moisture from said final stage removal zone into said drain cooling section, and baffle means positioned between said condenser section and said inlet means for reducing pressure in said drain cooling section to less than a pressure of said final stage removal zone.
- 2. The system of claim 1 wherein said baffle means comprises an orificed plate.
- 3. The system of claim 1 wherein said baffle means separates said condenser section from said drain cooling section.
Parent Case Info
This is a continuation-in-part of application Ser. No. 07/697,373 filed May 9, 1991 now U.S. Pat. No. 5,140,818.
The present invention relates to steam turbines and, more particularly, to a method and apparatus for improving turbine efficiency by utilization of steam extracted from a final moisture removal stage by a feedwater heater and by controlling the amount of extracted steam.
US Referenced Citations (6)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
697373 |
May 1991 |
|