Hydrogen Cooled Generator Seal Oil

CIRCOR Pumps and Systems in Power Generation Applications

Very large generators have their casing filled with hydrogen to reduce windage losses from the huge rotating generator rotor. In order to contain the extremely volatile hydrogen in the casing‚ pumps are used to pump oil into the generator shaft labyrinth seals at a pressure higher than the hydrogen.  This keeps the generator seals pressurized containing the hydrogen. 

The oil gravity drains to a tank located about 2 meters above the oil pumps. As a result‚ the oil pump inlet pressure is extremely low. Three screw pumps are used for their high reliability and ability to operate at extremely low suction pressures as well as their ability to operate at higher speeds than comparable flow gear pumps. Other systems integrate the seal oil system into the lube oil tank and use centrifugal pump.

Each hydrogen cooled generator is served by a main and auxiliary seal oil pump driven by an AC motor. There is also an emergency DC motor driven pump to provide the critical oil in the event of a turbine trip where AC power is not available. This allows the generator to safely coast down with out leaking the hydrogen gas.

Flow Rates up to Pressures to up to Max Fluid Temperature CIRCOR Brand‚ Series & Pump Type
51 m^3/h
225 GPM
16 bar
232 psi
155C
311F
IMO AB ACG
Three Screw
51 m^3 / h
225 GPM
16 bar
232 psi
120C
250F
Allweiler ALLlub RUV
Three Screw
91 m^3/h
400 GPM
34.5 bar
500 psi
120C
250F
IMO 3D
Three Screw
180 m^3/h
793 GPM
16 bar
232 psi
130C
266F
IMO AB ACF
Three Screw
317 m^3/h
1‚400 GPM
100 bar
1‚450 psi
250C
482F
Allweiler SN
Three Screw
550 m^3/h
2‚500 GPM
16 bar
232 psi
120C
250F
Allweiler NSSV
Centrifugal

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CIRCOR Industrial

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