Reheater temperature control

Details Reheater temperature control Reheater temperature control

2011-01-04

2011-01-04

Nguyen, Hoang M (Department: 3748)

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

C060S679000, C060S680000

Reexamination Certificate

active

07861527

ABSTRACT:
A thermal power generation apparatus comprises a boiler (15) and multiple turbine sets for high, intermediate and lower steam pressure operation. Steam exhausted from the high pressure turbine (HP), and reduced in both pressure and temperature, is returned to a reheater (19) for reheating. The reheated steam is then passed to a intermediate pressure turbine (IP). It is desirable to control the temperature of steam entering the intermediate pressure turbine (IP). The invention provides a system for effecting temperature control of the reheater stream in a thermal power plant. The system includes a reheater conduit (10, 21) adapted to define at least a part of a reheat flow path for steam between an exhaust of a high pressure turbine system (HP) and an inlet of a reheater system (19). The system further includes an indirect water/steam heat exchanger (B) having a heat exchange portion within the reheat flow path and defining a water flow path means adapted to receive and circulate feed water. The feed water may be taken from take off points (A, D) in the primary feed water stream.

REFERENCES:
patent: 3105357 (1963-10-01), Vogler
patent: 3886749 (1975-06-01), Pacault
patent: 4003786 (1977-01-01), Cahn
patent: 4896496 (1990-01-01), Zervos
patent: 2007/0199300 (2007-08-01), MacAdam et al.
patent: WO 95/24822 (1995-09-01), None

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