MVR Dual-Effect Evaporator

The MVR double-effect evaporator is a fast and energy-saving evaporation device that combines the advantages of mechanical vapor recompression (MVR) technology and double-effect evaporation. It is widely used in wastewater treatment, solution concentration, liquid food production and other fields.

1. Working Principle of MVR Double-Effect Evaporator

Vapor Compression: In an MVR double-effect evaporator, the secondary steam generated during evaporation is compressed by a steam compressor. During compression, the pressure and temperature of the secondary steam increase, and its enthalpy increases.

Heat Energy Recycling: The compressed secondary steam is sent to the heating chamber as heating steam. The heating steam heats the feed liquid, causing it to evaporate and produce more secondary steam. Simultaneously, the heating steam itself condenses into water, achieving the recycling of heat energy.

Double-Effect Evaporation: An MVR double-effect evaporator typically consists of two evaporator units: a first-effect evaporator and a second-effect evaporator. The secondary steam in the first-effect evaporator is compressed and used to heat the feed liquid in the second-effect evaporator. The secondary steam in the second-effect evaporator is also compressed and may be used for other heating processes or for recovery.

Condensation and Cooling: The evaporated secondary steam is condensed in a condenser to obtain a watery liquid. The condenser typically uses a counter-current design to accelerate the condensation rate and reduce condensation losses. The condensed water can be cooled by a cooling tower to improve the quality of the secondary steam.

2. MVR Double-Effect Evaporator System Design

Preheater: Increases the temperature of the material entering the evaporator, reducing evaporation time.

Evaporator: Includes first-effect and second-effect evaporators, responsible for heating, evaporating, and concentrating the material.

Gas-Liquid Separator: Effectively separates steam from the concentrated liquid.

Steam Compressor: Compresses the low-grade steam generated by evaporation, increasing its temperature and pressure, converting it into a high-quality steam heat source.

Condenser: Condenses the secondary steam into water, recovering heat.

Cooling Tower: Used to cool the condensed water, improving the quality of the secondary steam.

3. Energy Saving Effect of MVR Double-Effect Evaporator

Rapid Energy Saving: By recovering and reusing the latent heat of the secondary steam, energy consumption is significantly reduced, with energy savings reaching 60%~80%, or even higher.

Environmental Protection and Emission Reduction: The entire evaporation process does not generate new pollutants and can recover useful substances from wastewater, meeting environmental protection requirements.

4. Application Areas of MVR Double-Effect Evaporators

Wastewater Treatment: Used to treat wastewater with high salinity, high concentration, and high viscosity, achieving wastewater reduction, resource recovery, and zero discharge.

Solution Concentration: Used for the concentration of chemical raw materials, such as sodium sulfate and sodium chloride.

Liquid Food Production: Used for the concentration of liquid foods such as fruit juice and milk.

5. Advantages of MVR Double-Effect Evaporators

Simple Operation: Adopts an advanced automated control system, achieving fully automated operation, reducing operational difficulty and labor costs.

Convenient Maintenance: The equipment has a reasonable structural design, facilitating cleaning and maintenance, reducing downtime and maintenance costs.

Strong Adaptability: Capable of treating wastewater with high salinity, high concentration, and high viscosity, with a wide range of applications.

In summary, the MVR double-effect evaporator achieves a rapid, energy-saving, and environmentally friendly evaporation process through steam mechanical recompression technology and the principle of double-effect evaporation, and has broad application prospects and development potential.