MVR Evaporator
MVR evaporator is a device that uses the secondary steam generated in the evaporation system to work through a compressor, increases the enthalpy of steam, and circulates for heating and evaporation, fully utilizing the waste heat of the secondary steam and condensate in the system. The energy-saving effect is outstanding, reaching over 60%.
Our Evaporator is Applied in Various Fields
GQHB evaporator has mastered the core technology of low-temperature concentration, saving an average cost of 60% compared to traditional wastewater treatment. It is suitable for various industrial wastewater such as high salt wastewater, high COD wastewater, high concentration wastewater, oily wastewater, etc.
Introduction to MVR Evaporator
The MVR (Mechanical Vapor Recompression) device is used to compress secondary steam generated within an evaporation system using a compressor. This process increases the steam's thermal enthalpy, allowing it to be reused for heating and evaporation. This efficiently utilizes the residual heat of the secondary steam and condensate within the system, resulting in outstanding energy-saving effects. It requires no fresh steam, saving over 90% of condensate, 80% of manpower resources, and 60% of space.
The MVR evaporator employs a compressor to compress secondary steam. Domestic compressors can provide a temperature increase of 20℃, while imported ones offer an increase of 9℃. Therefore, the system requires the feed water's boiling point to be preferably less than 15℃ to achieve energy-efficient evaporation. In single-effect evaporation, the generated steam is used only once within the system. The difference between MVR and multi-effect evaporators lies in the continuous recycling of secondary steam within the system, so its energy is not wasted. The system consumes energy to increase the temperature from 119℃ to 130℃, which is the energy consumed by the compressor. MVR's energy efficiency is demonstrated by its ability to make secondary steam useful with only 16KJ input per ton of water.
Advantages of MVR Evaporator
- 1. High Heat Transfer Coefficient: This evaporator structure features a variable flow field, making the liquid easily achieve a vigorous turbulent state. Its heat transfer coefficient is 2-3 times that of shell-and-tube types.
- 2. Low Clogging Tendency: The liquid forms a disturbed flow on the heat exchange surface, which can scour the surface and dislodge scaling, delaying the scaling cycle.
- 3. Extremely Smooth Surface: The manufacturing process controls the surface roughness of the heat exchange area to a very low value, making it difficult for contaminants to adhere. The scaling rate of this type of heat exchanger is only 1/5 of that of shell-and-tube heat exchangers.
- 4. Easy Cleaning and Maintenance: The plate-type structure allows for easy disassembly of the heat exchange surface, and any contaminated or damaged surface can be easily replaced.
- 5. Applicable to: Evaporation crystallization of various inorganic salts, evaporation of liquids with high hardness, concentration of landfill leachate, and concentration of materials in the food, fermentation, and pharmaceutical industries, as well as concentration of heat-sensitive materials.
Components of MVR Evaporator
- 1. Preheater: In most cases, the solution to be evaporated needs to be preheated before entering the evaporator.
- 2. Evaporator: The solution needing evaporation is heated with the steam source in the evaporator. Different types of evaporators are selected based on the properties of different solutions.
- 3. Separator: Used for separating steam and liquid. Different separators, such as centrifugal, gravity, or specially structured separators, can be chosen based on the solution's properties.
- 4. Various Pumps: Used to transport the solution to be evaporated and the concentrated solution. Different types of pumps, such as centrifugal pumps, positive displacement pumps, and screw pumps, can be selected based on the properties of the solution.
- 5. Compressor: Provides an evaporation heat source by compressing secondary steam and increasing its thermal enthalpy. Various compressors can be selected according to the requirements of different flow rates and compression ratios. For situations requiring increased pressure rise, multi-stage compressors can be used in series.
- 6. Control System: The control center of the MVR evaporation system regulates motor speed, valves, flow meters, temperature, and pressure to achieve operations such as automatic evaporation, cleaning, and shutdown. It includes automatic alarms and protection to prevent system damage and maintain dynamic balance.
- 7. Cleaning System: After a period of evaporation, different solutions may cause scaling. Generally, more than 99% of scaling is removed by adding chemical solvents. CIP (Clean-In-Place) cleaning or removal for cleaning can be used.