Questions about centrifugal pump operation 2
Thread Content
Another question: For a pump with a rated flow rate of 550 m3/h, can throttling be used to control the liquid level when the actual operating flow rate is 250 m3/h? Would a backflow operation be more ideal? From the perspective of device optimization
The flow rate chosen isn’t quite right; it’s a bit too low. Generally, outlet valves are used to adjust the flow rate, while other methods are not used very often.
I agree with the view from the second floor – there is a problem with the selection of the model; the actual flow rate differs significantly from the rated flow rate, making it difficult to achieve proper control, and cavitation is also likely to occur! Using reflux is also an option, but it consumes a lot of energy and involves unnecessary work, which does not meet energy-saving requirements!
Hehe, I’ve learned it – we usually control the flow rate by adjusting the outlet valve
The same question has been asked many times; use frequency conversion control
Control valves are installed at the outlet; whether a return flow is needed depends on the requirements of the next processing stage
Use an inverter-driven motor. If that doesn’t work, backflow regulation will have to be used. The outlet can also be adjusted with control valves.
Without energy consumption, the pump will still be used: since no excess water flow of 200 m3/h is utilized and control is relied solely on the outlet valve, the pressure head generated by the pump is likely to be very high； Based on the Q-H curve, at this point the pump will operate for an extended period in a state of low flow rate and high head pressure; this is by no means the optimal operating condition. From a mechanical perspective, the wear and tear on the equipment will be relatively high – actual maintenance records can confirm this. I wonder whether it is feasible to change the control method while keeping the pump and operating conditions unchanged. I would appreciate professional analysis and guidance from both a fluid dynamics and economic standpoint. Thank you:handshake