Regarding the issue of filter backwashing, I am seeking advice from relevant experts
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The normal operation of the filter relies on a 50-mm pipeline; when the pressure difference is high, gas is used through a 50-mm pipeline for backwashing. If the pressure difference remains high, liquid is used for backwashing. Since the temperature of the backwashing liquid is lower than normal, its flow rate is reduced, which means that the diameter of the pipeline used for the backwashing liquid is only DN10. Will it be effective to use a DN10 pipeline to flush the filter via a DN50 pipeline? Is this feasible?
There’s no problem with this simple surface issue; the key issue lies in ensuring unobstructed drainage at the discharge point. Blowing out first with gas and then with liquid should work fine. The differential pressures in use here are different. The flow velocity of the gas-driven fluid is different from that of the liquid-driven fluid.
Mainly, during liquid backwashing, the volume of fluid used is relatively small due to viscosity; moreover, when the pipe diameter changes, the flow rate becomes extremely low, which makes it difficult to carry out an effective cleaning process
Why isn’t the backwash fluid made from the filtrate itself, but rather from a fluid at a lower temperature with reduced flow rate? Doesn’t this result in the generation of waste liquid? I don’t understand why it was designed this way. Whether DN10 appears too small depends on factors such as your filtration area and the viscosity of the filter cake, which need to be considered together.
It is recommended to check the user manual; you might not understand the principle behind backflow. It should be noted that gas backwashing is more effective than liquid backwashing. Furthermore, as can be seen from the diagram, the backflow oil is pressurized by a positive displacement pump; backflow can also be achieved if the pressure is sufficient. While paying attention to the pipe diameter, factors such as pressure (pressure difference), temperature, and flow rate cannot be ignored.