Triple Effect Evaporation Crystallization System for NaCl — Chinese Supplier
As a leading China-based manufacturer, Hanpu delivers turnkey triple-effect falling-film evaporation and vacuum crystallization systems tailored for sodium chloride (NaCl) recovery and refinery brines. Our solution converts saturated or impure brine into >99.5–99.9% NaCl crystals with excellent steam economy, stable quality, and fully automated operation.
Energy Efficient by Design
Three effects in cascade reuse latent heat. Typical steam economy: 1 kg steam evaporates 3.5–4.0 kg water (with TVR/MVR options for further savings).
NaCl-Focused Process Control
Inline density/conductivity, vacuum regulation, and mother-liquor recycle deliver tight crystal size and purity for table salt or chlor-alkali feed.
Hygienic, Easy to Maintain
Mirror-polished seamless tubes minimize fouling and ease CIP; short residence time protects product whiteness.
Process Flow — Triple Effect + Vacuum Crystallization
- Feed & Preheat: Raw brine is metered through preheaters to the 1st-effect heater.
- Effect 1 → Effect 2 → Effect 3: Live steam heats Effect 1; its vapor heats Effect 2; Effect 2 vapor heats Effect 3 under lower pressure and temperature.
- Concentration Control: Online density targets trigger discharge to the crystallizer or recycle for re-evaporation.
- Vacuum Crystallization: Concentrated liquor flashes/boils under vacuum to form pure NaCl crystals; centrifuge or filter separates crystals and mother liquor.
- Condensation & Utilities: Final vapor condenses in the condenser; clean condensate is recovered. Non-condensables are removed via vacuum pump.
System Structure
Three effects (heaters & separators), preheaters, vacuum crystallizer with circulation pump, condenser & vacuum set, feed/circulation/discharge/condensate pumps, centrifuge (optional), CIP skid, PLC/HMI with historian, and full instrumentation (T/P/level/flow/vacuum/conductivity).
Typical Triple-Effect Falling-Film — Illustrative Specifications
| Parameter | Unit | Value (Example) |
| Evaporation capacity | kg/h | 3,000 – 50,000 |
| Raw steam consumption | kg/h | ~900 @ 3,000 kg/h duty (≈30% of single-effect) |
| Evaporation temperature (1st / 2nd / 3rd) | °C | ≈99 / 76 / 53 (vacuum) |
| Steam pressure (1st effect) | MPa (abs) | 0.6 – 1.0 |
| Materials of construction | — | SS304 / SS316L (Duplex/Ti on request) |
| Crystal purity (NaCl) | % | >99.5–99.9 (process-dependent) |
| Automation | — | PLC/HMI, recipe control, alarms & interlocks, data logging |
Applications
- NaCl Production: Table salt and chlor-alkali feed with controlled crystal size.
- Brine Refining & ZLD: Desalination reject, mining brine, and chemical effluents.
- Integration: Compatible with RO/NF pretreatment and forced-circulation crystallizers.
Delivery Workflow
Feed & targets → Bench/pilot (optional) → Process & heat balance → Detailed engineering & fabrication → Installation & commissioning → Performance test & training → O&M support with spares.
About Hanpu
Hanpu is a professional EPC supplier of evaporation and crystallization systems in China. We focus on energy-saving multiple-effect and MVR technologies for salts and industrial wastewater. From feasibility and investment analysis to long-term operations, we deliver predictable payback, safety, and consistent quality.
