In evaporation crystallization equipment, the temperature of the liquid feed is preheated to the boiling point or above before it enters the evaporator for evaporation; so what about the preheating temperature in the earlier stages...
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During the evaporation and crystallization of sodium sulfate, why is the primary condensate water preheated, raising the temperature of the feed solution from 25°C to 80–85°C? The secondary non-condensable gas is preheated to 100°C; how is the preheating temperature for each stage determined? It is preheated to 100°C before entering the falling film evaporator. Why, when it reaches 100°C before entering the evaporator, isn’t 100°C still below the boiling point?
To understand the production process of this material, one cannot focus solely on the effect of temperature on the material; it is also related to the pressure in the working environment at that particular stage. The saturated pressure and temperature of a substance are determined by relevant conditions, for reference only.
These are the characteristics of the MVR evaporator: without preheating, there is higher consumption of raw steam, a larger evaporator area is required, and the investment cost is higher.