- 2025-07-22
Industrial chiller water treatment system
Core water treatment objectives
Hardness control: total hardness of circulating water ≤150mg/L (calculated as CaCO₃)
Scaling inhibition: Langelier index (LSI) <1.0
Microbial control: total number of heterotrophic bacteria <1×10⁵CFU/mL
Four-stage water treatment process
1. Multi-stage pretreatment system
Self-cleaning filter (filtration accuracy 100μm)
Pressure difference control automatic backwash (ΔP≥0.05MPa trigger)
Retention rate>95% (protection of back-end membrane system)
Ultrafiltration pretreatment (hollow fiber membrane 0.03μm)
SDI value stable <3 (meet reverse osmosis water inlet requirements)
2. Water softening unit
Dual tank ion exchange system
Strong acid cation resin (exchange capacity ≥2.0eq/L)
Effluent residual hardness ≤0.03mmol/L
Fully automatic regeneration control (flow/time dual mode trigger)
3. Chemical precision dosing system
Inhibitor dosing (organic phosphine carboxylic acid composite formula)
Dosing concentration 2-5mg/L (adjusted according to the concentration multiple)
pH adjustment unit (sodium bicarbonate automatic metering)
Control range 7.5-8.5 (carbon steel system corrosion window)
4. Reverse osmosis deep treatment
Desalination grade RO membrane (desalination rate ≥ 98.5%)
Constant flow control system (frequency conversion regulation ± 2% error)
Production water conductivity ≤ 30μS/cm (25℃)
Project failure response measures
Failure type Technical solution
Abnormal pipeline resistance Install online differential pressure sensor (accuracy 0.1kPa)
Evaporator glazing Add automatic rubber ball cleaning device (2 cycles per day)
Refrigerant leakage Infrared spectrum leak detector (sensitivity 5g/year)
Heat exchange efficiency attenuation Titanium tube heat exchanger replaces copper tube (corrosion resistance grade B)
Operation and maintenance advantages of water-cooled units
Heat exchange tube life ≥ 10 years (copper tube < 5 years)
Energy efficiency ratio (COP) increased by 25-30%
No fan exposed structure design (reduces the risk of dust blockage)
Energy saving range of variable frequency compressor 30-100% load
Key control parameters
Concentration multiple: 4.0-6.0 (lower limit for hard water area)
Discharge rate control: circulating water volume 0.1-0.3%
Corrosion inhibitor residual concentration monitoring (potentiometric titration method)
