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How multi-effect evaporators are used in high-salt wastewater treatment

The multi-effect evaporation processor is mainly used to treat industrial wastewater with high concentration, high chroma and high salinity. At the same time, the attached products produced during 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 a two-effect evaporation. This in turn utilizes the secondary steam of the previous effect as the heat source of the next effective evaporator. According to the conservation of energy, the amount of steam consumed by the processor per 1 t of water evaporation is 1.1 for single effect, 0.57 for double effect, 0.4 for three effects, 0.3 for four effects, and 0.27 for five effects.

     The material is evenly distributed into the evaporator tubes through the distributor, and the material forms a film under the action of gravity and self-evaporation secondary evaporation, and 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, secondary steam formed by evaporated water is used multiple times. According to the characteristics of materials, the maximum use of multiple times to reduce steam consumption, forming multi-effect evaporation and high efficiency The purpose of energy saving.

Multi-effect evaporator equipment use:

      Multi-effect evaporator is the sprinkling filtrate, MSG, fermentation liquid, corn paddle, starch wastewater, starch syrup, xylose liquid in the fermentation industry, starch/starch sugar industry, juice industry, beverage industry, pharmaceutical industry, environmental protection industry. Evaporation and concentration equipment for comprehensive treatment of wastewater, 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, and the water in the waste water is vaporized into secondary steam, and the concentration of the waste water in the evaporator is increased. When a certain concentration is reached, the intermediate circulation pump is sent to the first effect evaporator to enter the first effect evaporation. The waste water of the device is exchanged with the primary steam, and the water in the waste water is largely evaporated, and the secondary steam generated enters the second effect heater as a heat source. When the first effect wastewater concentration is continuously increased, the vacuum differential pressure state is maintained. Next, the wastewater enters the second effect evaporator by itself, and the secondary steam generated by the second effect enters the third effect as a heat source. When the material in the second effect crystallizer reaches the desired supersaturation concentration, the discharge pump discharge is started for centrifugal drying. The whole set of evaporation process is cross-flow evaporation, continuous feeding and continuous discharging. The salt removal rate in the wastewater after three-effect evaporation treatment can reach 98%-99%.


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