Method and apparatus for controlling steam turbine inlet...

Details Method and apparatus for controlling steam turbine inlet... Method and apparatus for controlling steam turbine inlet...

2005-09-06

2005-09-06

Verdier, Christopher (Department: 3745)

Rotary kinetic fluid motors or pumps

Method of operation

C415S013000, C415S017000, C415S047000

Reexamination Certificate

active

06939100

ABSTRACT:
In a method of controlling steam flow through a steam turbine having a turbine rotor, a maximum heat transfer rate is determined based on thermal stress calculations in the turbine rotor. A maximum steam flow rate can be calculated based on the maximum heat transfer rate. An actual steam flow rate through the steam turbine is determined, and a turbine inlet valve is controlled based on a difference between the actual steam flow rate and the maximum steam flow rate. In this manner, steam flow can be controlled to the steam turbine in such a way as to limit thermal stress to an acceptable level while minimizing start times and maximizing operability.

REFERENCES:
patent: 4303369 (1981-12-01), Hisano et al.
patent: 4309873 (1982-01-01), Koran et al.
patent: 4320625 (1982-03-01), Westphal et al.
patent: 4668161 (1987-05-01), Miller et al.
patent: 5498131 (1996-03-01), Minto
patent: 6250877 (2001-06-01), Westphal et al.

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