Fluctuations in the feed to the hydrogen sulfide removal tower
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Dear experts: In our company’s diesel and gasoline hydroprocessing unit, the low-temp feed enters the hydrogen sulfide removal tower via hot and cold feeds. Currently, the volume of the cold feed fluctuates significantly, by 30 m3 at a time, and these fluctuations occur very frequently. We have adjusted the flow meters and confirmed that there is no issue with them. Could you please help analyze the reasons for these fluctuations and suggest ways to address them? The pressure at the low-pressure stage is 1.5 Mpa; the pressure in the hydrogen sulfide removal tower is 0.7 Mpa, with the feed to the tower occurring under self-pressure.
Since the flow rate indicator is fine, try switching to manual control for a while to find out the cause!
What is the total amount of material? If it’s 50, then it’s a process issue; if it’s 1000, then there’s no problem
1. The control valve is operated manually; check whether the valve is fluttering to rule out any issues with it. 2. Verify whether the level gauge and interface agent are correct
This post was last edited by Lao Wu Set on 2020-9-28 at 19:01. Whether there is a problem with the traffic is still debatable. The cold low-pressure section has a lighter load, so the heating for the pressure tapping tube of the flow meter can be reduced appropriately. If it is confirmed to be high-frequency regular fluctuations, the failure probability of the cold feed actuator (positioner, diaphragm head, valve spool) is relatively high. Additionally: Check the mixed feed process once more to confirm that the path is unobstructed.