How to solve unstable outlet flow of the hydrogenation feed pump
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I’m seeking help from fellow shipyard professionals: our hydrogenation system is a modified version designed for using diesel as feedstock, with a pressure of 11.95 MPa. The flow rate at the outlet of the feed pump is 90 T/h, and the amount of recycled hydrogen is around 138,000; the system is designed to handle 700,000 tons per year. Currently, the processing capacity of the feed pump fluctuates by around 2 tons, ranging between 90 T/h. I would like to ask everyone what could be causing this issue and what solutions are available. In the past, simulations showed that this phenomenon occurred when the minimum flow rate was set to a slightly higher value; now it still exists even when the minimum flow rate is set to zero.
It is mostly caused by fluctuations in the system pressure; some fluctuations are normal, so it’s important to keep the pressure stable
Why does the reaction system fluctuate? How can one determine the fluctuations in the reaction system?
Pressure fluctuations in the reaction system are caused by various factors; by examining the trend lines and comparing different parameters, one can understand the reasons
The reason for the fluctuations in reaction pressure is unstable pressure control. The properties of the raw materials have changed, the hydrogen supply pressure is unstable, and the pressure control parameters of the booster pump have not been set properly. Teachers, is it correct?:)
Is it possible that your gauge is inaccurate, or that there is surging in the feed control valve? Needless to say, if the instrument is inaccurate, it needs to be calibrated. If the sensitivity setting of the control valve itself is too high, it may also cause the valve stem to move frequently over small distances, which can lead to wear on the fixed travel distance of the flow control valve stem, as well as inaccurate regulation.
Check the filter screen and the crude oil tank, and carry out liquid cutting operations
Another point is to check the PID parameter settings of the control valve; it doesn’t need to be too sensitive.
The PID parameters of the control valve need to be adjusted
Set the control valve to manual mode and compare the outlet instruments (there should be more than one)