Pump outlet flow control issue
Thread Content
The outlet pipeline of a pump is divided into two branches, each equipped with a flow meter and a control valve; it is required that automation be applied to both branches. The current problem is that only one channel can be used, while the other one cannot be utilized. Obviously, there is severe coupling between the two control loops. Some theoretical studies present several different approaches to addressing this issue. I would like to ask if any of you have used configuration (algorithms) in DCS systems to solve this problem?
Check whether the sampling points are appropriate, whether the control direction of the valve actuator is correct, and whether the tuning settings for proportion and integration are reasonable. For reference.
A pump has two outlet pipelines, and each pipeline is equipped with a flow control circuit; there is an inherent relationship between the flow controls of these two pipelines, and this inherent relationship cannot be decoupled. Ensure precise control of one important channel, while employing rough control for the other. Reduce the proportionality of the precise control loop, and increase that of the rough control path.
Both circuits require precise control; even if one circuit is operated in a more rough manner, it will cause instability in the other circuit
Change the flow meters and valves to be in series, with one set placed on the main pipeline at the pump outlet and another set on the branch pipeline.
The most crucial thing is to select the appropriate CV value for the control valve; this is of utmost importance. In our pilot plant’s partitioned tower, we use one pump with two outlets to precisely control the flow rate in each outlet.
It can definitely be achieved as long as the process is stable; the key is to select the right valves. The other flow can be involved in the regulation and control in proportion
Pump outlet pressure maintained at a constant frequency modulation
Do not choose a linear-type control valve; the valve spool may need to be adjusted