DSS2205 MVR Evaporator Horizontal Tube Evaporator 5T/HR For NaCl
Product Description
Duplex stainless steel DSS2205 MVR horizontal-tube evaporator engineered for NaCl brine concentration and crystallization at a nominal 5 t/h water removal. Mechanical Vapor Recompression (MVR) recycles latent heat to minimize steam consumption while horizontal calandrias provide robust heat transfer for saline, scaling-prone service.
Key Benefits
- Corrosion & stress resistance: DSS2205 duplex resists chloride stress corrosion cracking better than 304/316L.
- Energy saving: Electric-driven MVR duty delivers low OPEX and small utility footprint.
- Scaling mitigation: High-velocity circulation across horizontal tubes maintains coefficients and limits deposition.
- Crystal quality: Controlled supersaturation/residence time supports tight NaCl PSD and low moisture.
- Continuous automation: PLC/HMI recipes, alarms, historian, and remote diagnostics for 24/7 uptime.
Process & Thermal Economy
Clarified brine is concentrated under vacuum. The MVR compressor elevates vapor temperature/pressure and reuses it as the primary heating medium in the horizontal-tube calandria. Optimized Δ T/LMTD, circulation rate, and slurry density stabilize supersaturation for predictable NaCl crystallization at low specific energy.
Materials & Hygiene
Wetted parts: DSS2205 (UNS S32205/S31803). Options: super duplex, SS316L, or Ti for special chemistries. Drainable layouts, smooth finishes, and CIP provision support long campaigns and fast turnarounds.
Process Overview -- NaCl Brine to Crystals
Brine purification: dissolver → softening (Ca/Mg removal) → clarification/filtration → polishing.
MVR evaporation (vacuum): horizontal tubes with forced circulation; compressor sets ΔT and capacity.
Crystallization: seeded growth; slurry density and residence time govern PSD and purity.
Solid-liquid separation: pusher/peeler centrifuge; mother liquor recycle.
Drying & sizing: fluid-bed/vibratory drying → sieving; optional iodization/anti-caking.
Key Components
- DSS2205 horizontal-tube heater (straight/U-tube bundle) with vapor-liquid separator
- MVR compressor (turbo/Roots) with VFD for ΔT/capacity control
- Preheaters, surface condenser, vacuum/NCG handling skid
- Crystallizer with slurry density control; centrifuge; dryer; screeners
- PLC/HMI/SCADA; instruments (T/P/flow/conductivity/level); CIP skid & antiscalant dosing
Performance & Sizing
| Parameter |
Typical Target / Range* |
| Evaporation rate |
5 t/h (water removal), adjustable via compressor VFD |
| Operating mode |
Vacuum, continuous |
| Electric use (MVR) |
~15-40 kWh per ton H₂O evaporated (duty/CR dependent) |
| Fresh steam demand |
Very low after start-up (backup/ancillary only) |
| Crystal size bands |
Fine 0.2-0.5 mm; Table 0.5-1.2 mm; Coarse 1.2-2.5 mm |
| Materials |
DSS2205 wetted; super duplex/316L/Ti optional |
*Performance depends on brine composition, scaling tendency, compression ratio, and exchanger/crystallizer design.
FAQ
Why choose DSS2205 for salt service?
Duplex metallurgy offers higher chloride SCC resistance and strength, enabling thinner walls and better lifecycle in saline duty.
Can this line integrate with ZLD?
Yes--commonly paired with RO/NF upstream and crystallizer/centrifuge/dryer downstream for solids discharge.
How is scaling controlled?
Proper softening/pH control, optimized ΔT/velocity, antiscalant dosing, and scheduled CIP maintain high heat-transfer rates.
Application
Your message must be between 20-3,000 characters!
