Reasons for changes in traffic display
Thread Content
Due to the blockage of the inlet filter screen in the distillation tower feed pump, the pressure at the pump outlet is unstable, which causes fluctuations in flow rate. The opening of the control valve is too large, resulting in a flow rate reading of 28 cubic meters per hour (with fluctuations up and down). After cleaning the filter screen at the pump inlet, the outlet pressure of the centrifugal pump remained stable, with a flow rate of 22 cubic meters per hour; the opening degree of the control valve decreased. I can’t figure out why the flow rate reading decreased. Please ask a professional to explain, thanks
What is the setpoint for your feedback control loop?
What is the setpoint for your feedback control loop?
You have reduced the setting of your control valve, so naturally the flow rate is lower.
There must also be the factor of flow rate!
What type of flow meter are you using? Different principles lead to different reasons
What process parameters are used to control this control valve, the outlet flow rate? Exit pressure? Does the pump have a constant backflow? It is best to upload a PID diagram.
In response to the questions from some kind-hearted friends above, there is no reflux without the pump running； Generally, a set flow value is used to control the opening degree of the control valve. The traffic volume remains unchanged; it’s only the displayed value of the traffic that has changed