Fin Evaporator is the physical process of transforming liquid into gaseous state. Generally speaking, a finned evaporator is a substance that converts a liquid substance into a gaseous state. There are a large number of fin-type evaporators in the industry, and the fin-type evaporator used in refrigeration systems is one of them.

The finned evaporator is a very important part of the four major refrigeration components. The low-temperature condensed liquid passes through the evaporator, exchanges heat with the outside air, vaporizes and absorbs heat, and achieves the effect of refrigeration. The evaporator is mainly composed of two parts, a heating chamber and an evaporation chamber. The heating chamber provides the heat required for evaporation to the liquid to promote the boiling and vaporization of the liquid; the evaporation chamber completely separates the gas and liquid phases.

The vapor generated in the heating chamber contains a large amount of liquid foam. After reaching the evaporation chamber of a larger space, these liquids can be separated from the vapor by self-condensation or defoamer. Usually the demister is located at the top of the evaporation chamber.

The fin type evaporator is divided into three types: normal pressure, pressurized and depressurized according to the operating pressure.

According to the movement of the solution in the evaporator, there are:

① Circulating type. The boiling solution passes through the heating surface many times in the heating chamber, such as the central circulation tube type, the hanging basket type, the external heating type, the Levin type and the forced circulation type.

②One-way type. The boiling solution passes through the heating surface once in the heating chamber without circulating flow, and then discharges the concentrated liquid, such as rising film type, falling film type, stirring film type and centrifugal film type, etc.

③Direct contact type. The heating medium directly contacts the solution to transfer heat, such as a submerged combustion evaporator. During the operation of the evaporation device, a large amount of heating steam is consumed. In order to save heating steam, a multi-effect evaporation device and a steam recompression evaporator can be used. Evaporators are widely used in chemical, light industry and other sectors.

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