Can the turbine continue to operate after the seal oil pump of the hot high-pressure hydraulic turbine in the residue hydrodesulfurization unit shuts down?
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The sealing and flushing scheme selected for the hydraulic turbine is 32+53C. If the seal oil pump with model 32 stops operating, in order to prevent residue oil from entering the isolation fluid tank of 53C, is it necessary to stop the turbine immediately, or can it continue to operate? Experts with practical experience, please share your approaches.
It can operate for a short period of time, but there are certain risks involved; the service life of the seal is affected, increasing the likelihood of high-temperature oil leakage.
It can continue to operate for a while, but not for too long, as oil is present from the throttle bushing to the mechanical seal face; thus, residue oil cannot get in for a short period of time.
Here, we usually stop for about 10 minutes to start the backup oil sealing pump
If the time is long, won’t it be difficult to deal with the residue oil entering the sealed chamber?
32 represents pressurized flushing, while 53C denotes pressurized sealing. With a throttle bushing in place, it is difficult for residue oil to enter the sealing chamber; and even if it does enter, it will not affect the sealing surface. The main issue is that temperature can lead to insufficient cooling of the sealing surface； And if the residue enters the pressure guide pipe at 32°C, it will condense, causing piston operation failures.