Ask for help: Water pump operation mode selection
Thread Content
I have a question. There are three 350S44A water pumps in the secondary pump room of our factory.: 864m3/h, h=40.5m, and two 150S50 pumps: 160m3/h, h=50m, the water flow rate of the pipe network is greater than or equal to 2000m3/h, and the pressure is greater than or equal to 0.41Mpa. If two large pumps and one small pump can meet the water demand, long-term operation is not economical. How to transform it into a more reasonable and economical operation? Please help with analysis, thank you!
I personally think that the characteristic curve of the pump should be used, and I would also like to know what everyone thinks about it.
The total water consumption in the factory can be calculated. Since it can be calculated, it is necessary to determine the matching of the pumps. For example, if the total water consumption is greater than 2000m3/h, then you can choose 2 water pumps with a flow rate of 2400m3/h, so that one can be started and the other can be prepared. Based on your current situation, You can drive two large pumps and two small pumps, and install frequency converters on the two large pumps to ensure the water flow through pressure balancing. Water pumps plus frequency converters are a common way of industrial water delivery, which is economical, reasonable, and energy-saving.
Just convert one of the large pumps to the frequency according to the current demand flow of your plant, and run it as 2 large pumps + one large pump with variable frequency. This should be able to meet water requirements and save energy.
If the pipeline layout is good and the pipeline resistance is small enough, running two large pumps and one small pump should be able to meet the water demand, and it is also the most economical option.
The water flow rate in the pipe network is greater than or equal to 2000m3/h, and the pressure is greater than or equal to 0.41Mpa. Two large pumps and one small pump cannot meet the water demand. Three large pumps should be operated, one with variable frequency operation which is the most economical.
Two large pumps + two small pumps are operated. One of the small pumps has a frequency conversion control pump outlet pipe to stabilize the pump pressure, and one large pump is left as a spare.