softener design calculations - Hence Ion Exchange load for...

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Softener Operation (Basic Ion Exchange Process) Thumb rules of designing a Softener Step 1 – To Select resin quantity (ltrs) for a particular hardness (ppm) for a particular output (m3) per regeneration per hour based on regeneration level 160 gm/ltr, ion exchange capacity = 55, TDS limit = 1500 ppm refer Table 1 Resin Quanitity = Load (ppm as CaCO3) * Flow * time Ex. Capacity For example Load = Hardness = 100 ppm as CaCO3 Flow = 5M3/hr Time = (Service Cycle) = 12 hrs. Ex. Capacity =60 gm as CaCO3 Resin Quanitity = 100 * 5 * 12 = 60 100 litres Note : 1. Na/Tc and TDS and correction factor should be applied. 2. Actual Resin Quantity = 60* correction due Na/Tc factor * Correction due to TH factor = 60 * 0.96 * 0.97 = 56 (approximately)
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Unformatted text preview: Hence Ion Exchange load for designing a softener is 56. These calculations are based on Ion Exchange resin and will varry from manufacturer to manufacturer resin. Step 2 To select vessel model for a selected resin quantity, approx. flow rates based on linear velocity min = 8 m3/m2/hr and max = 25 m3/m2/hr, and freeboard 5-100 %, refer Table 2 Important points on Softener Linear velocity should not be less than 8m3/m2/hr and should not be more than 25m3/m2/hr. Regeneration level, hardness leakage desired and correction factors can be found from resin supplier graph Tables for all these are shown but the actual resin supplier graph should be used. These tables can be used for first calculation....
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