High salt
evaporator is a professional equipment used for treating high salt wastewater. The following is a detailed introduction about it:
Working principle
By heating, the water in the wastewater is vaporized, achieving the separation of salt and water, thus achieving the purpose of concentrating wastewater and recovering salt.
Common types and characteristics
Principle: It is usually composed of multiple evaporators connected in series, using the secondary steam generated by the previous effect as the heat source for the subsequent effect, achieving multiple utilization of thermal energy and reducing energy consumption.
Advantages: High thermal efficiency, low steam consumption, suitable for treating high salinity and high concentration wastewater, able to achieve continuous feeding and discharging of wastewater, and can treat high salinity wastewater with a salt content of ≥ 3.5%.
Disadvantages: High equipment investment, large footprint, and regular cleaning and maintenance are required during operation to prevent scaling and blockage.
Mechanical vapor recompression (MVR) evaporator
Principle: The low-temperature secondary steam generated by evaporation is compressed by a steam compressor, and after increasing its temperature and pressure, it is reintroduced as a heat source into the system. Only a small amount of external energy, such as electricity driving the compressor, is needed to maintain the evaporation process, achieve energy recycling, and achieve energy-saving effects.
Advantages: Significant energy-saving and consumption reducing effects, compared to traditional multi effect evaporators, energy consumption can be reduced by more than 50%, and operating costs are low; High degree of automation, capable of real-time monitoring and control of temperature, pressure, liquid level and other parameters, achieving unmanned operation; Compact equipment structure and small footprint; Strong adaptability to high salinity and high COD wastewater, especially suitable for low-temperature evaporation of thermosensitive materials.
Disadvantages: The initial investment of the equipment is high, and the selection and maintenance requirements of the compressor are high. If the treated wastewater contains a large amount of solid particles or viscous substances, it may affect the normal operation of the compressor.
Falling film evaporator
Principle: The solution forms a thin film along the inner wall of the heating tube and flows downwards. Under the action of gravity and steam heating, the water evaporates.
Advantages: High heat transfer efficiency, liquid flows in a thin film form, short residence time of materials at high temperatures, suitable for processing heat sensitive materials, and can reduce the risk of material deterioration.
Disadvantages: There are certain requirements for the viscosity and flow rate of the material. If the viscosity of the material is high or the flow rate is low, it may cause uneven distribution of the liquid film, affecting the evaporation effect, and the cleaning and maintenance of the equipment is relatively complex.
Low temperature evaporator
Principle: In a vacuum environment, the wastewater is evaporated at a lower temperature to reduce scaling and corrosion problems.
Advantages: Operating at low temperatures reduces equipment corrosion and scaling issues, making it suitable for chemical high salt wastewater containing easily crystallizable substances or heat sensitive components. It has strong adaptability to wastewater and can treat high salt wastewater with various complex components.
Disadvantages: The evaporation rate is relatively slow, the processing capacity is small, and the vacuum system of the equipment needs regular maintenance to ensure its normal operation.
Application Area
Chemical industry: deals with high salt wastewater generated from chlor alkali chemical, coal chemical, dye chemical, etc., and recovers industrial salts such as sodium chloride and sodium sulfate.
Pharmaceutical industry: Concentrate thermosensitive materials such as antibiotics and vitamins to avoid high temperature damage to active ingredients, separate organic matter from antibiotic mother liquor, and reduce hazardous waste.
Printing and dyeing industry: Treat high salinity and high chromaticity printing and dyeing wastewater, achieve wastewater reuse or meet discharge standards.
New energy industry: used for wastewater concentration in lithium battery material production, recycling valuable metals such as lithium and cobalt.
Food processing industry: Concentrate soy sauce, monosodium glutamate wastewater, etc. to achieve water resource recycling and zero emissions.
Jinkebotong Environmental Protection Technology (Jiangsu) Co., Ltd
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