Apparatus for controlling steam blocking at stuffing boxes for s

Details Apparatus for controlling steam blocking at stuffing boxes for s Apparatus for controlling steam blocking at stuffing boxes for s

1975-04-16

1976-06-01

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Having apparatus cleaning, sealing, lubricating, purging,...

60646, 60656, F01K 1300

Patent

active

039599736

ABSTRACT:
In a steam turbine structure, a stuffing box is conventionally provided for the rotor shaft at the shaft passthrough opening in the turbine casing and blocking steam is admitted to the stuffing box. In order to prevent thermal-shock damage to the shaft at the stuffing box during a re-start of the turbine while the shaft temperature is still approximately at its normal operating temperature and while the blocking steam is then temporarily in a wet state, the blocking steam is prevented from reaching the stuffing box, the wet steam being diverted by way of a controllable valve through a by-pass leading to a condenser. After the blocking steam has reached its dry state, the valve closes off the by-pass to the condenser and opens the blocking steam line leading to the stuffing box.

REFERENCES:
patent: 3062553 (1962-11-01), Juzi
patent: 3302951 (1967-02-01), Olesen
patent: 3604206 (1971-09-01), Baily

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