Should the rotor be turned after the new hydrogen compressor is shut down?
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The experts in the forum discussed two issues: 1. Whether it is necessary to rotate the shaft of the new hydrogen compressor after it stops operating. The colleagues from Sinopec said that shaft rotation is needed, while those from CNPC said that there is no need for such action and the compressor can be stopped directly. 2. When the new hydrogen compressor is in normal standby mode, should it be in a hydrogen-operated state or a nitrogen-operated state? The colleagues from Sinopec said that after the new hydrogen compressor is shut down, the inlet valve should remain open while the outlet valve is closed, keeping it in a hydrogen environment. The colleagues at CNPC said that the backup unit should have its inlet valves closed to release hydrogen; after filling it with nitrogen, the unit is then filled with nitrogen again, and hydrogen is used to fill it once it is started up next time. As for what CNOOC’s colleagues think about this issue, which version do you use when adopting it? I’m putting this out there to spark discussion and see how the experts on this forum would answer it.
1. Stop and just leave. 2. During preparation in hydrogen operation mode, both the inlet and outlet valves are kept open to ensure immediate startup when needed.
1. Rotate the shaft after shutting down. 2. It is in hydrogen state during normal standby, as switching may occur at any time. However, nitrogen purging is required after each shutdown, as maintenance work is usually carried out after a shutdown, and hydrogen in an unstable state is highly prone to explosion; therefore, other operations can only be carried out after nitrogen purging has been completed successfully following each shutdown. Once the maintenance and adjustments are completed and the system meets the required standards, open the compressor inlet valve (of course, the outlet valve remains closed during the previous stages), so that the system can operate in a hydrogen-filled state as a standby unit!
I. Cranking the engine is essential! II. After shutting down, nitrogen replacement is necessary! III. All entrances and exits shall be closed; nitrogen is available for use, and nitrogen protection shall be activated!