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Performance characteristics of thin film evaporators!
2021-07-15
A thin-film evaporator is a type of evaporator characterized by the material liquid flowing as a film along the heating tube wall for heat transfer and evaporation. Its advantages include high heat transfer efficiency, fast evaporation speed, and short material residence time, making it particularly suitable for evaporating heat-sensitive materials.
According to the reasons for film formation and the flow direction, it can be divided into three types: rising film evaporator, falling film evaporator, and wiped film evaporator. The thin-film evaporator unit consists of three components: an evaporator, a vapor-liquid separator, and a preheater, as well as a simple separator; the evaporator is a rising film tubular heat exchanger. This evaporator has the characteristics of large production capacity, high efficiency, and short material heating time. It is suitable for the concentration of dilute solutions in the pharmaceutical, food, and chemical industries. The parts of this equipment that come into contact with the material are made of stainless steel, which has good corrosion resistance, durability, and meets pharmaceutical hygiene requirements.
Performance characteristics of thin-film evaporators!
①Small vacuum pressure drop:
The material vaporized gas is sent from the heating surface to an external condenser, with a certain pressure difference. In general evaporators, this pressure drop (Δp) is usually quite high, sometimes even unacceptably high. However, the scraped film evaporator has a large gas passage space, and the pressure inside the evaporator can be considered almost equal to the pressure in the condenser. Therefore, the pressure drop is very small, and the vacuum can reach 5 mmHg.
②Low operating temperature:
Due to the above characteristics, the evaporation process can be carried out under high vacuum conditions. Due to the improvement in vacuum, the boiling point of the material decreases accordingly. Therefore, the operation can be carried out at a lower temperature, reducing the thermal decomposition of the product.
③Short heating time:
Due to the special structure of the scraped film evaporator, the scraper has a pumping function, which makes the residence time of the material in the evaporator very short. In addition, the high-speed turbulence of the thin film on the heated evaporator prevents the product from remaining on the evaporator surface. Therefore, it is especially suitable for the evaporation of heat-sensitive materials.
④High evaporation intensity:
The reduction in the boiling point of the material increases the temperature difference with the heating medium; the function of the scraper reduces the thickness of the turbulent liquid film, reducing the thermal resistance. At the same time, this process inhibits the formation of wall scaling on the heating surface, accompanied by good heat exchange, therefore improving the overall heat transfer coefficient of the scraped film evaporator.
⑤Large operating flexibility:
It is precisely because of the performance of the scraped film evaporator that it is suitable for processing heat-sensitive materials requiring stable evaporation, high-viscosity materials, and materials whose viscosity increases sharply with increasing concentration. The evaporation process can also achieve stable evaporation. It can also be successfully applied to the evaporation and distillation of materials containing solid particles, crystals, polymers, and scaling.
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