Mechanical MVR Evaporation System — Vapor Recompression Vacuum Machine
The Mechanical Vapor Recompression (MVR) evaporation system is a vacuum-based machine designed to concentrate and crystallize high-salinity or heat-sensitive solutions. By mechanically compressing secondary vapor and recycling it as the heating medium, the system achieves remarkable energy savings, low operating costs, and continuous stable performance.
- Energy efficiency: reduces fresh steam consumption to near zero, cutting utility bills
- Vacuum operation: maintains low boiling temperatures, protecting heat-sensitive products
- Stable crystal quality: precise control of supersaturation ensures consistent grain size
- Reliable uptime: designed for long campaigns with CIP-ready configurations
Applications
Widely applied in chemical, pharmaceutical, food, environmental, and salt industries, the MVR vacuum evaporator is suitable for brine concentration, salt crystallization, high-COD wastewater ZLD, pulp black liquor, and value-added product recovery.
Vapor Recompression
Secondary vapor is mechanically compressed, raising its temperature and reusing latent heat as the main heating source.
Vacuum Machine
Operates under vacuum to lower boiling points, improve thermal economy, and protect sensitive materials.
Mechanical Reliability
Robust turbo/Roots compressors with VFD control allow high efficiency and load flexibility.
Process Overview
- Feed preparation: pre-filtration, softening, and deaeration
- Evaporation under vacuum: forced circulation, ΔT controlled for optimal performance
- Mechanical compression: vapor recompressed to provide heat
- Crystallization: supersaturation control ensures desired crystal size
- Solid-liquid separation: centrifugation, drying, and recycling of mother liquor
Key Components
- MVR forced-circulation evaporator/crystallizer with circulation pumps
- Mechanical vapor compressor (turbo/Roots) with VFD and protections
- Vapor–liquid separator, heat exchangers, condensers, and vacuum system
- Automation controls with PLC/HMI/SCADA for continuous operation
- CIP skid and anti-scaling dosing for extended uptime
Performance Highlights
| Parameter | Typical Range* |
| Electric consumption | ~15–40 kWh per ton of water evaporated |
| Fresh steam demand | Minimal after start-up |
| Operating pressure | Vacuum (customized per application) |
| Product consistency | High, with narrow crystal size distribution |
| Availability | ≥ 95% with proper CIP scheduling |
*Performance depends on feed quality, compression ratio, and heat-exchanger design.
FAQ
Is MVR suitable for high-salt wastewater?
Yes — the system is widely used in ZLD projects for high-salinity brine concentration and crystallization.
Can it handle food-grade applications?
Absolutely — stainless steel 316L/duplex materials, hygienic designs, and full CIP validation are available.
How does it save energy?
By compressing and reusing vapor, MVR recovers latent heat, drastically lowering steam use compared to multi-effect units.
