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Multi Effect Mvr Falling Film Vacuum Evaporator Sodium Chloride Salt Line

Multi-Effect MVR Falling Film Vacuum Evaporator — Sodium Chloride Salt Line

Multi-effect MVR falling-film vacuum evaporator line for sodium chloride refining

Engineer-to-order multi-effect falling film evaporator integrated with MVR (Mechanical Vapor Recompression) for sodium chloride (NaCl) refining lines. Operating under vacuum, the hybrid MEE+MVR train achieves high thermal efficiency, precise supersaturation control, and continuous crystal quality for edible and industrial salt production.

Key Benefits

Energy efficiency: MVR recycles latent heat; multi-effect staging lowers specific energy use and fresh steam demand.
Crystal quality: Controlled nucleation/growth delivers narrow size distribution for table, fine, or coarse grades.
Stable vacuum duty: Falling film with low ΔT preserves heat-transfer coefficients and limits fouling.
Food-grade compliance: 316L/duplex materials, drainability, CIP-ready design supporting HACCP/ISO.
Line integration: Seamless tie-in with brine purification, centrifugation, drying, sizing, iodization, and packing.

Process & Thermal Economy

Secondary vapor is mechanically recompressed and reused as the primary heating medium, while upstream/downstream multi-effect falling film effects cascade energy. Tight control of ΔT/LMTD, residence time, and recirculation stabilizes supersaturation for repeatable NaCl crystallization and low OPEX.

Materials & Hygiene

Wetted parts in SS316L/duplex (Ti/Hastelloy on request), sanitary finishes, sloped/drainable piping, validated CIP, and material traceability for food-contact applications.

Process Overview — Refined NaCl Line

Flow: brine make-up/purification → multi-effect + MVR falling-film evaporation → crystallization → centrifugation → drying/sizing → iodization/packing

Brine make-up & purification: dissolving, softening (Ca/Mg removal), clarification/filtration, polishing.
Multi-effect + MVR evaporation (vacuum): staged effects with recompressed vapor to drive heat duty.
Crystallization control: supersaturation setpoints for target grain bands (fine/table/coarse).
Solid–liquid separation: peeler/pusher centrifuge; mother liquor recycle.
Drying & sizing: fluid-bed/vibratory drying; sieving/polishing to spec; optional iodization & anti-caking.
Packing: retail (1 kg) to bulk (25–50 kg) with weight checks and metal detection.

Key Components

Multi-effect falling film evaporator bodies with preheaters/condensers
MVR compressor (turbo/Roots) with VFD for ΔT/capacity control
Vapor–liquid separator, main heater, vacuum/NCG handling system
Brine purification skid (dissolver, softening, clarification, filtration)
Peeler or pusher centrifuge; fluid-bed/vibratory dryer; sieving/polisher
PLC/HMI/SCADA, instrumentation (T/P/flow/cond/level), historian & remote access
CIP skid; iodization and anti-caking dosing modules

Performance & Sizing

Parameter	Typical Target / Range*
NaCl purity (dry)	≥ 99.2% (up to 99.7% with enhanced purification)
Moisture (final)	≤ 0.2% (grade-dependent)
Crystal sizes	Fine 0.2–0.5 mm; Table 0.5–1.2 mm; Coarse 1.2–2.5 mm
Line capacity	5–500 t/day (modular trains)
Electric use (MVR)	~15–40 kWh per ton H₂O evaporated
Fresh steam demand	Very low after start-up (backup/ancillary only)
Campaign length	≥ 10–20 days between CIP (feed-dependent)

*Performance depends on feed composition, scaling tendency, compression ratio, and heat-exchange area.

FAQ

Why combine multi-effect with MVR?

The hybrid layout merges the low utility demand of MVR with the thermal economy of MEE, balancing CAPEX and OPEX.

Can you supply food-grade documentation?

Yes—material traceability, surface finish records, and CIP validation support HACCP/ISO 22000 programs.

What product grades are supported?

Fine, table, and coarse salt with optional iodization and anti-caking, plus industrial grades on request.

Application

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Categories	MVR Evaporator
Brand Name:	HANPU
Model Number:	MVR
Certification:	ISO9001,CE
Place of Origin:	Jiangsu,China
MOQ:	1 set
Price:	100,000USD~2,500,000USD/SET
Payment Terms:	T/T,L/C,D/A,D/P
Supply Ability:	1 set/90days
Delivery Time:	3 months
Packaging Details:	Bulk with includes fixtures