Method and apparatus for controlling the final feedwater...

Details Method and apparatus for controlling the final feedwater... Method and apparatus for controlling the final feedwater...

2006-05-09

2006-05-09

Nguyen, Hoang (Department: 3748)

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

C060S679000

Reexamination Certificate

active

07040095

ABSTRACT:
This invention relates to a method and apparatus for controlling the final feedwater temperature associated with a regenerative Rankine cycle, said cycle commonly used in thermal systems such as conventional power plants. This invention involves the placement of a new heat exchanger, termed an Exergetic Heater, in the feedwater path downstream from the highest pressure feedwater heater to assure that the feedwater is properly heated to its final temperature before entering the steam generator. The heating of the feedwater is accomplished by routing steam from the Intermediate Pressure turbine, which normally is routed to the second highest pressure heater. Control of the final feedwater temperature is achieved through a control valve whose actuation adjusts the amount of steam flow being routed from the Intermediate Pressure turbine to the Exergetic Heater.

REFERENCES:
patent: 3518830 (1970-07-01), Dunnavant et al.
patent: 3842605 (1974-10-01), Tegtmeyer
patent: 4336105 (1982-06-01), Silvestri, Jr.
patent: 5267434 (1993-12-01), Termuehlen et al.
patent: 6422017 (2002-07-01), Bassily
J. Kenneth Salisbury, “Steam Turbines and Their Cycles”, Krieger Publishing Co., Huntington, NY, pp. 43-93 and 266-273.

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