The fully automatic water softener requires the use of industrial salt for backwashing the resin during operation, so the amount of salt used should be budgeted based on the amount of resin before equipment operation to meet the system backwashing requirements.
Calculation process of salt consumption for fully automatic water softener
1. Calculate the volumetric total exchange capacity of the resin parameter: ≥ 1900mmol/L (001 × 7); The working exchange capacity of resin is ≥ 1200mmol/L, calculated based on 1400mmol/L. The hourly flow rate is taken as 0.3m3/h=300L/h. The daily running time is 24 hours.
2. The total exchange capacity of the resin filled in the regeneration cycle (time type) equipment is: 1400 mmol/L × 25L=35000mmol. The amount of hardness that needs to be removed from water every day is 300L/h × 24h × (6-0.03) mmol/L=42984mmol. So, the theoretical regeneration cycle of time controlled equipment is: 35000/42984=0.81d=19.5h.
3. The total exchange capacity of the resin filled in the regeneration cycle (flow type) equipment is: 1400 mmol/L × 25L=35000mmol. The amount of hardness that needs to be removed per ton of water is 1000L × (6-0.03) mmol/L=5970mmol. So, the theoretical regeneration cycle of flow type control equipment is: 35000/5970=5.86m3, which means that the production of 5.86 tons of water and the need for regeneration once can be controlled by the flow soft water equipment valve.
4. The periodic salt consumption factor is 1mmol/L=2mg equivalent/L. For the hardness in this calculation, it can be temporarily written as: 1mmol/L=2mg equivalent. The total exchange capacity of the resin filled in the equipment is: 1400 mmol/L × 25L=35000mmol, that is, 35000 × 2=70000 mg equivalent=70 g equivalent. The calculation formula for periodic salt consumption is: Periodic salt consumption (kg)=total exchange capacity (gram equivalent) × (0.08~0.1kg)/gram equivalent. So, the periodic salt consumption (kg)=70 (gram equivalent) x 0.1 kg/gram equivalent=7 kg (dry NaCl). 5. The salt solution concentration is calculated to be 28-32% based on the salt volume and salt valve height. The amount of salt solution required for cyclic regeneration (m3)=(cyclic salt consumption (kg)/32%)/1000. The required amount of salt solution for periodic regeneration (m3)=(7kg/32%)/1000=0.021875 m3=21.875L. That is, choosing a 25L salt tank is just right. The size of the 25L PE salt box is: Φ 245 × 500mm. Salt valve height (m)=salt liquid volume (m3)/(3.14 × salt tank radius 2 (m))=0.021875 m3/(3.14 × 0.12252) m2=0.46m.
