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What are the advantages and characteristics of the thin film evaporator and how to choose?
- Aug 09, 2018 -

The specific type of evaporator of the thin film evaporator can be said to be used more, and its application range is wide, and the performance and use effect are good.

 

A thin film evaporator is an evaporation device in which a material flows in a vaporizer and evaporates. If it is divided according to the direction of material film formation, it can be divided into three types: rising film evaporator, falling film evaporator and hanging film evaporator. In application, it is mainly concentrated in dilute solutions in the pharmaceutical, food and chemical industries, as well as evaporation of some heat sensitive substances.

 

1. Advantages and characteristics of thin film evaporator

The thin film evaporator has high heat transfer efficiency, fast evaporation rate and short residence time of the material in the evaporator. The characteristics of this type of evaporator are:

 

(1) The vacuum pressure drop is small, and the internal pressure of the evaporator is almost equal to the internal pressure of the condenser, which can reach 5 mmHg in terms of vacuum.

(2) The evaporation process of the thin film evaporator can be carried out under the condition of higher vacuum, thereby further lowering the boiling point of the material, so that the evaporation operation can be carried out at a lower temperature and the thermal decomposition of the product is lowered.

(3) Due to the unique structure of the evaporator, the residence time of the material in the evaporator is very short. Moreover, the material does not have a problem of retention in the evaporator.

(4) The thin film evaporator has a small total heat transfer coefficient and can reduce the thermal resistance to improve the heat exchange effect, so that the evaporation strength is high.

 

2. Selection of thin film evaporator

 

The selection of thin film evaporators is an important task, so it should not be treated and carried out, and some specific aspects should be considered.

 

Production capacity and operating parameters: The relevant parameters, such as the amount of treatment, the concentration of material in and out, the evaporation temperature and the operation time, are important and key parameters.

 

Product characteristics: mainly for the important parameters of the product, including heat sensitivity, viscosity, fluidity, solid content, etc. In addition, it also includes two crystallization and polymerization tendencies.

 

Operating medium and manufacturing materials: The operating medium is mainly considered to be water vapor, cooling water or cleaning liquid. In the manufacturing materials, it is determined according to the use environment and use requirements, and the surface polishing requirements are also considered. Claim.

 

Site conditions: mainly the product temperature of the thin film evaporator, the ambient humidity, the climatic conditions, and whether there are operational noise and environmental protection requirements.

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