Regeneration Flow Rate Calculation For DM Plant

Regeneration flowrate for what equipment, exactly?

• For a filter vessel containing granular materials, the regeneration or rather backwash flowrate is restricted to below that needed to fluidise the media material so that it leaves the vessel via the backwash outlet valve; the flowrate is usually restricted by having an adjustable mechanical stop on that valve that is set and locked during process commissioning activity.

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Resin Regeneration Fundamentals | Water Quality Products
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The only thing I would add to Lyn's comments is this:

The flow rate for regeneration of a demineralizer plant depends on the type (and size) of the equipment. Usually for a two bed cation/anion system of the older co-current regeneration type, the regeneration flow rate will be 35-45% of service flow rate. For a counter current regeneration two bed system this might be slightly lower, as I recall, but again this depends on the type of equipment and the design of the internals.

For mixed bed demineralizer regeneration, the resin types must be separated, either internally to the vessel, or externally by resin removal, separation, and regeneration. Flow rates of dilute caustic soda and dilute acid will be considerably below service flow, but the answer again depends on the type of equipment as to how low. Too low, and the regeneration performance will suffer, too high same answer, and also possible loss of resin, depending on design.