The three effect evaporator desalination method has a wide range of processing capabilities

  Evaporation is one of the modern chemical unit operations, which uses heating to vaporize and clean some solvents in a solution to increase the concentration of the solution and provide conditions for solute precipitation. The three effect evaporator desalination method is a method of using a concentrated crystallization system to clean inorganic salts in waste liquid by evaporation. A three effect evaporator is composed of three evaporators connected in series. Low temperature (around 90 ℃) heating steam is introduced into the first effect to heat the waste liquid, and the generated steam is introduced into the second effect as heating steam, causing the waste liquid in the second effect to evaporate at a lower temperature than the first effect. This process is repeated until the second effect. One effect condensate returns to the heat source, and one part of steam is added. At the same time, high salt wastewater is concentrated sequentially from the first effect to the final effect, and crystallizes and precipitates when the final effect reaches supersaturation, thereby achieving solid-liquid separation of salt and wastewater.

In the treatment process of saline wastewater, the saline wastewater enters the three effect concentration crystallization device, and through the three effect evaporation condensation concentration crystallization process, it is separated into desalinated water and concentrated crystal slurry waste liquid; Inorganic salts and some organic compounds can be crystallized and separated, and incinerated to produce inorganic salt waste residue; Organic waste liquid that cannot crystallize can be concentrated using a drum evaporator to form solid waste residue, which can be incinerated; Desalinated water can be returned to the production system to replace softened water for utilization.

The three effect evaporator desalination method has the advantages of a wide range of Wastewater treatment, small footprint, fast treatment speed, and energy saving. With the development of the chemical industry, more and more high salt wastewater needs to be treated, and the application of the three effect evaporator desalination method will become increasingly widespread.