MVR The evaporator returns the secondary vapor generated during evaporation to the heating side for reuse after it is pressurized and heated by a compressor, replacing most live steam consumption with electrical energy. It is mainstream energy-saving equipment for concentration and volume reduction in ZLD systems.
Process Principle
- The secondary vapor generated by evaporation enters the compressor, where it is compressed and its pressure and temperature increase.
- The heated vapor returns to the heater as a heat source, forming a closed-loop cycle.
- Only a small amount of live steam is needed to start up and balance heat losses, and operating energy consumption is mainly electricity.
Product Features
- With secondary vapor recycling, energy consumption per unit evaporation is significantly lower than that of multi-effect evaporation.
- Electricity is the main energy source, eliminating the need for large-scale boilers and steam pipe networks.
- Evaporation temperature is controllable and operation is mild, helping inhibit scaling and decomposition of heat-sensitive materials.
- It offers a high degree of automation and can operate continuously and stably, meeting large-scale concentration requirements.
Application Industries
- Concentration and volume reduction of high-salinity wastewater and pre-treatment before ZLD crystallization.
- Concentration and crystallization of feed liquids in the chemical, pharmaceutical, and food industries.
- Deep concentration of difficult-to-treat wastewater such as landfill leachate and desulfurization wastewater.
- Evaporative crystallization for salt lake brine, hydrometallurgy, and new energy materials.
Specifications and Models
| Parameter | Unit | Typical value |
|---|---|---|
| Evaporation capacity | t/h | 1–100 (typical, parallel units can be added for capacity expansion) |
| Power consumption per unit evaporation | kWh/t | 20–45 (typical, depending on boiling point elevation) |
| Evaporation temperature | ℃ | 40–100 (typical) |
| Compressor type | — | Centrifugal / Roots type |
| Discharge solids content | % | 20–40 (typical, depending on the material) |
| Material | — | Stainless steel 316L / duplex steel / titanium |
The data in the table are common ranges for similar equipment and are for selection reference only; specific specifications, models, materials, connections, and control methods must be confirmed during the selection stage based on water quality, treatment scale, and site conditions.