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How to use multi-effect evaporator for high-salt wastewater treatment
The multi-effect evaporation processor is mainly used to treat industrial wastewater with high concentration, high chroma and high salt content. At the same time, the by-products generated in the wastewater treatment process are recovered. Low steam consumption, low evaporation temperature, large concentration ratio, more reasonable, more energy efficient and more efficient.
Multi-effect evaporation treatment principle:
In the first evaporator heated by direct steam, the secondary steam generated by the boiling of the heated liquid enters the second evaporator as a heat source, which is the second-effect evaporation. In this way, the secondary steam of the previous effect is used as the heat source of the evaporator of the next effect. According to the conservation of energy theory, the amount of steam consumed by the processor for each 1t of water evaporation is: single effect 1.1, double effect 0.57, three effect 0.4, four effect 0.3, and five effect 0.27.
The material is evenly distributed into each evaporator tube through the distributor.The material forms a film under the action of gravity and secondary evaporation in the form of self-evaporation.At the same time, the material film exchanges heat with the steam on the outer wall of the tube to make the water in the material. Heated evaporation, stable temperature difference and heat transfer, forming stable evaporation, the secondary steam formed by the evaporated water is used multiple times. According to the characteristics of the material *** a large number of multiple uses to reduce steam consumption and form a multi-effect The purpose of evaporation and effective energy saving.
Multi-effect evaporator equipment uses:
Multi-effect evaporators are used in the fermentation industry, starch / starch sugar industry, fruit juice industry, beverage industry, pharmaceutical industry, environmental protection industry, tank filtrate, monosodium glutamate, fermentation liquid, corn paddle, starch wastewater, starch syrup, and xylose liquid. Evaporation and concentration equipment for comprehensive treatment of wastewater such as fruit juice, vegetable juice, soy whey water, milk, high-concentration organic and chemical wastewater.
Process flow:
The wastewater enters the three-effect heater and exchanges heat with the second-effect secondary steam. The waste water is heated by the third effect heater, the water in the waste water is vaporized into secondary steam, and the concentration of the waste water in the evaporator is increased. When it reaches a certain concentration, it is pumped into the maximum effect evaporator by the intermediate circulation pump. The waste water entering the first-effect evaporator is heat exchanged with the primary steam, and the water in the waste water is evaporated in large quantities. The secondary steam generated enters the second-effect heater as a heat source. When the concentration of the most effective wastewater continues to be After being raised, in the state of vacuum pressure difference, the wastewater enters the second-effect evaporator by itself, and the secondary steam produced by the second effect enters the third effect as a heat source. After the material in the second effect crystallizer reaches the required supersaturation concentration, the discharge pump is turned on to discharge the material for centrifugal drying. The whole set of evaporation process is cross-flow evaporation, continuous feeding and continuous discharging. After three-effect evaporation treatment, the salt removal rate in wastewater can reach 98% -99%.


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