Tubular Type Exchanger Forced Circulation MVR Evaporator
Product Description
Engineer-to-order tubular (shell-and-tube) MVR evaporator with a forced-circulation loop for high-salinity, viscous, and solids-bearing feeds. Mechanical Vapor Recompression (MVR) recycles latent heat as the primary duty, delivering low OPEX, robust heat transfer, and stable 24/7 operation for chemical, food, and environmental services.
Key Benefits
- Rugged thermal core: Tubular exchangers tolerate scaling/erosion better than narrow-gap plates.
- Stable with solids: High-velocity forced circulation maintains ΔT/LMTD and limits deposition.
- Energy saving: Electric-driven MVR minimizes fresh steam after start-up.
- Wide duty window: Fits concentration, mother-liquor recovery, and ZLD pre-crystallization.
- Serviceability: Straight/U-tube bundles, large clean-outs, CIP-ready design.
Process & Thermal Economy
Secondary vapor is mechanically compressed to elevate saturation temperature and reused as the heating medium. The forced-circulation loop provides high shear at tube walls, protecting heat-transfer coefficients across variable chemistry and viscosity while keeping specific energy low.
Materials & Cleanability
Wetted parts in SS316L/duplex; titanium/Hastelloy options for chloride or aggressive feeds. Drainable layouts, removable channel heads, CIP skid, and antiscalant dosing extend campaign length.
Process Overview -- Tubular FC MVR
- Feed conditioning: screening/filtration, softening or pH trim to mitigate scaling/corrosion.
- Tubular heater + separator: high-velocity loop under vacuum for efficient, gentle evaporation.
- MVR compression: VFD-driven compressor sets discharge pressure (ΔT) and capacity.
- Condensate polishing: filters/RO/AC to reuse or compliant discharge (conductivity/TOC guard).
- Concentrate routing: to crystallizer/centrifuge/dryer or recycle per ZLD/production needs.
Key Components
- Tubular shell-and-tube heater (straight/U-tube) with forced-circulation pump
- MVR mechanical vapor compressor (turbo/Roots) with VFD
- Vapor-liquid separator, surface condenser, vacuum/NCG handling skid
- Preheaters/heat-recovery HX; PLC/HMI/SCADA with historian
- CIP skid; antiscalant dosing; instrumentation (T/P/flow/cond/level)
Performance & Sizing
| Parameter |
Typical Range* |
| Operation |
Continuous, vacuum duty |
| Electric use (MVR) |
~15-40 kWh per ton of water evaporated (duty/CR dependent) |
| Shell pressure |
~6-25 kPa(abs), feed/ΔT dependent |
| Turndown |
50-100% with stable ΔT and quality |
| Materials |
SS316L / duplex; Ti/Hastelloy on request |
*Performance depends on feed salinity/viscosity, fouling tendency, compression ratio, and exchanger design.
FAQ
When choose tubular over plate/pillow plate?
For scaling, particulates, or erosion risk, tubular exchangers provide higher robustness and allow mechanical cleaning.
Can it integrate into our ZLD train?
Yes--commonly paired with RO/NF upstream and crystallization/solids handling downstream.
How is scaling managed?
Optimized ΔT/LMTD and velocity, antiscalant dosing, scheduled CIP, and corrosion-appropriate materials (e.g., Ti for chlorides).
Application
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