Interpretation of the structural classification of evaporators with good refrigeration components

June 08, 2022

Editor's note: The evaporator is a very important part of the four major parts of refrigeration. The low-temperature condensed "liquid" body passes through the evaporator, exchanges heat with the outside air, and "gases" to absorb heat to achieve the cooling effect. This article mainly introduces the characteristics and composition of the evaporator.

The evaporator is mainly composed of a heating chamber and an evaporation chamber. The heating chamber provides the heat required for the evaporation of the liquid, and promotes the liquid to boil and vaporize; the evaporation chamber completely separates the gas-liquid two phases. The steam generated in the heating chamber carries a large amount of liquid foam. After reaching the evaporation chamber in a larger space, these liquids can be separated from the steam by their own condensation or demister. The tube Condenser is usually located at the top of the evaporation chamber.

The evaporator is divided into two types: circulation type and membrane type. According to the movement of the solution in the evaporator, it is divided into circulation type. The boiling solution passes through the heating surface many times in the heating chamber, such as central circulation tube type, hanging basket type, external heating type, Levin type and forced circulation type. One-way type. The boiling solution passes through the heating surface once in the heating chamber without circulating flow, that is, the concentrated liquid is discharged, such as rising film type, falling film type, stirred film type and centrifugal film type.

The heating medium directly contacts the solution to transfer heat, such as submerged combustion evaporator. In the operation process of the evaporation device, a large amount of heating steam is consumed. To save heating steam, a multi-effect evaporation device and a steam recompression evaporator can be used.

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