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Operation Process of MVR Three-effect Evaporation

2020-05-25

With the continuous development of industrial evaporation technology, the structure and type of evaporation equipment are also constantly improved and innovated, with a wide range of different structures. At present, there are more than 60 kinds of industrial practical evaporation equipment, of which there are more than ten types of the most commonly used, the following small series for everyone to introduceMVR three-effect evaporation.
MVR three-effect evaporation is mainly composed of three groups of evaporators, condensers, salt separators and auxiliary equipment connected in series. Three groups of evaporators operate in series to form a three-effect evaporator.

MVR three-effect evaporationThe system adopts the production mode of continuous feeding and continuous discharging. High-salt wastewater first enters the first-effect forced circulation crystallization evaporator. The crystallization evaporator is equipped with a circulating pump to pump the wastewater into the evaporation heat exchange chamber. In the evaporation heat exchange chamber, the external vapor liquefaction generates latent heat of vaporization to heat the wastewater.
Due to the high pressure in the evaporation heat exchange chamber, the waste water is heated to superheat in the evaporation heat exchange chamber at a pressure higher than the normal boiling point of the liquid. After the heated liquid enters the crystallization evaporation chamber, the pressure of the wastewater drops rapidly, causing part of the wastewater to flash or boil rapidly.
The steam after the evaporation of waste water enters the two-effect forced circulation evaporator as the power steam to heat the two-effect evaporator, and the unevaporated waste water and salt are temporarily stored in the crystallization evaporation chamber.
The first-effect, second-effect, and third-effect forced circulation evaporators communicate with each other through a balance pipe. Under the action of negative pressure, the high-salt wastewater flows from the first effect to the second effect and the third effect. The concentration of salt in the wastewater is getting higher and higher. When the salt in the wastewater exceeds the saturation state, the salt in the water will continue to precipitate and enter the salt collection chamber at the lower part of the evaporation crystallization chamber.
The salt suction pump continuously sends the salt-containing wastewater to the vortex salt separator. In the vortex salt separator, the solid salt is separated into the salt storage tank, and the separated wastewater enters the two-effect forced circulation evaporator for heating. The whole process is repeated to realize the final separation of water and salt.