What are the reasons for the inaccurate high-pressure cut-off level in lubricating oil hydrogenation?
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As the title suggests, when a certain amount of oil is drawn off and large quantities of acidic water at the bottom are discharged, the oil level drops significantly, while the interface level remains unchanged. Calibrating the level gauge using oil and water separately yields accurate results; however, the actual level when it is put into operation is not accurate. The acidic water discharged by the level gauge contains a significant amount of black suspended particles – could this affect the sensitivity of the level gauge? Is it too low to keep the oil level at 60%, resulting in insufficient space and time for oil and water separation?
1. Too many impurities during startup, or excessive catalyst dust, cause clogging of the interface meter. 2. The amount of water injected is too large; interface settlement does not occur in a timely manner, preventing complete stratification. Try reducing the water injection volume based on the ammonia nitrogen levels and see! If it’s still not allowed, clear the interface display
Re-enable the level gauge and transmit the data to the site for comparison.
A liquid level control of 60% is acceptable; for level-based control, a value of 85% is needed. Set the system to automatic liquid level control to maintain a stable water injection rate – give it a try and observe the results
Should it be double flange or a caisson? Black suspended solids can have a significant impact; density has a huge effect on the liquid level. When our installation first started up, we faced lots of problems because of this
So how did you solve it later?
The liquid level is around 60%; the remote level sensor gives completely inaccurate readings, showing over 100%. Even when using a medium-based calibration for the level measurement, the readings remain incorrect. The water injection volume is quite stable, at around 75% of the designed level, and the water is injected before the air cooler located before the cold high-pressure section.