1. System Configuration:
Combines three plate evaporators (multi-effect) with one tubular evaporator (final effect)
Designed specifically for potassium dihydrogen phosphate (KH₂PO₄) solution concentration and crystallization
2. Technical Specifications:
Evaporation Capacity: 15.8 tons/hour
Final Concentration: 60% product output
Operating Pressure:
- 1st effect: 0.3-0.4MPa (steam pressure)
- Subsequent effects operate at progressively lower pressures
Temperature Range: 70-120°C across different effects
3. Material Construction:
Primary Material: TA2 titanium (Grade 2 titanium)
Application Points:
- Plate heat exchangers made of titanium for corrosion resistance
- Tubular evaporator with titanium tubes
- Titanium alloy used for all wetted parts contacting the phosphate solution
4. Process Flow:
1st effect plate evaporator receives fresh steam
2nd effect uses vapor from 1st effect as heat source
3rd effect further utilizes secondary vapor
Final tubular evaporator completes concentration
Forced circulation design maintains proper crystal suspension
5. Energy Efficiency Features:
Steam economy ≈ 3.5kg steam/kg water evaporated
Heat recovery system between effects
Condensate flash steam utilization
6. Specialized Components:
Plate evaporators with optimized corrugation pattern
Tubular evaporator with crystal circulation system
Centrifugal separators for each effect
Vacuum system for pressure reduction
CIP (clean-in-place) system
7. Control System:
PLC-based automatic control
Density monitoring for product concentration
Pressure differential control between effects
Automatic anti-scaling measures
