Precautions for shutting down the hydrogen circulation compressor in hydrogenation processes
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I would like to ask the experts: after a cyclic hydrogen compressor stops operating due to a fault, how do you handle the inlet and outlet areas as well as the anti-surge system? Shut it down right away? If the anti-stall system is also turned off, will stall oscillations occur during continued coasting?
After the cyclic hydrogen compressor stops due to a fault, the system’s emergency pressure relief interlock is activated; the feed pump shuts down, the reactor is shut off, the inlet and outlet electric valves close, and the anti-surge valve opens – these are all part of the interlocked actions.
It usually doesn’t happen; the idling lasts only for a short while
After the cyclic hydrogen compressor stops, the anti-surge valve will be activated via interlock
After the interlock shutdown, wait until the speed drops to a safe level (for example, 600 rpm) before closing the inlet and outlet valves, as well as the anti-surge electric valve
Follow-up question: The dry gas seal is installed after the outlet valve. So when the system is depressurized after shutdown, could this cause backflow in the dry gas seal? After all, switching to nitrogen can only be done once the pressure has dropped to the level corresponding to nitrogen pressure
Why close the inlet valve? It’s enough to close just one outlet to prevent high pressure from leaking into the low pressure area
Are you driven by a steam turbine? Our dry gas seal is led out in front of the shut-off valve. No, you’ve got it wrong