How to better operate the MVR three effect evaporation equipment?
2020-04-29
In the process of chemical production or industrial wastewater treatment,MVRthree-effect evaporationIt is a common evaporative concentration crystallization equipment, but some operators are interested initsI know less, and I have some difficulty in the process of operation and learning. Today Xiaobian and everyone to understandItHow it works.
MVRthree-effect evaporationPrinciple：It is an evaporation operation after three evaporators are combined. During operation, the pressure of the after-effect and the boiling point of the solution are lower than the front-effect evaporator. The secondary steam of the front-effect is introduced as the heating medium of the after-effect, that is, the heating chamber of the after-effect becomes the condenser of the front-effect secondary steam. Generally, the first effect needs to consume raw steam. UnderstandingItThe principle can be better understoodEquipmentfor better operation.
MVRthree-effect evaporationComposition：It is mainly composed of three groups of evaporators, condensers, salt separators and replication equipment connected in series to form a complete set of three-effect evaporation system.
MVRthree-effect evaporationWorking principle：The material to be evaporated enters the first-effect heater for heating through the feed pump, then enters the evaporation chamber for evaporation, and performs gas-liquid separation in the separator. The solution flows into the suction port of the circulating pump from the bottom of the separator, and is sent to the heater and separator for circulation flow and evaporation by the circulating pump. The evaporated steam enters the condenser and is completely condensed.
In the evaporation heat exchange chamber, the external steam liquefaction generates latent heat of vaporization to heat the wastewater. Due to the high pressure in the evaporation heat exchange chamber, the material is heated to superheat at a pressure higher than the normal boiling point of the liquid in the evaporation heat exchange chamber. After the heated liquid enters the crystallization evaporation chamber, the pressure of the material drops rapidly, causing part of the material aqueous solution to flash or boil.
The steam after the evaporation of waste water enters the two-effect evaporator as a power evaporator for heating, and the unevaporated waste water and salt are temporarily stored in the crystallization evaporation chamber. The first-effect, second-effect and third-effect evaporators communicate with each other through balance pipes. Under negative pressure, high-salt wastewater or materials flow from the first-effect to the second-effect and third-effect in turn. The wastewater is continuously evaporated, and the concentration of salt in the wastewater is higher and higher. When the salt in the wastewater exceeds the saturation state, the salt in the water will continuously precipitate out and enter the salt collecting chamber at the lower part of the evaporative crystallization chamber, brine separation is achieved.
The condenser is connected with a vacuum system. The vacuum system pumps out the uncondensed gas generated in the evaporation system, so that the condenser and the evaporator are kept in a negative pressure state, and the evaporation efficiency of the evaporation system is improved. Under the action of negative pressure, the secondary steam generated by the wastewater in the three-effect evaporator automatically enters the condenser. Under the cooling of the circulating cooling water, the secondary steam generated by the wastewater material is quickly converted into condensed water. Condensed water can be recycled to the reuse pool by means of continuous water discharge.
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