Feedwater heater control system for improved Rankine cycle power plant efficiency
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United States of America Patent
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Apr 19, 2016
Grant Date -
Jun 21, 2012
app pub date -
Dec 20, 2010
filing date -
Dec 20, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A steam cycle system comprises a boiler comprising a superheat section, a reheat section, and an economizer section, wherein the boiler is configured to receive a feedwater stream; a steam turbine system comprising a high pressure turbine and a lower pressure turbine, wherein the steam turbine system is configured to receive steam generated by the boiler; a condenser configured to receive at least a portion of the outlet steam from the steam turbine system and output the feedwater stream; a high pressure feedwater heat exchanger configured to receive at least a portion of the feedwater stream, allow for an energy exchange between the portion of the feedwater stream and a steam stream, and output the portion of the feedwater stream to the boiler; a steam extraction line configured to provide a steam flow from an outlet of the high pressure turbine to the high pressure feedwater heater; a feedwater temperature control device configured to control the temperature of the feedwater stream by modulating the energy transfer in the high pressure feedwater heat exchanger between the steam flow provided through the steam extraction line and the portion of the feedwater received by the high pressure feedwater heat exchanger.
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