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Evaporators And Its Types

Date:3 February, 2020   |   No Comments   |   Posted By Team Alaquainc

What is the Evaporator?

An evaporator systems is a device used for the process of turning the form of a substance from liquid to gaseous form or vapor and the process is known as evaporation.

Evaporator Systems Types:

  • Falling Film Evaporators-

    The falling film evaporator is used for the heat exchanger. So, it consists of a vertical shell and a tube heat exchanger.  Hence, the concentrated liquid is fed at the top of the tube and then flows down to the surface tube as a thin film. As it intensifies, it generates vapors, enhancing heat transfer and further separating the vapor and liquid.

Falling Film Evaporators

  • Rising Film, LTV (Long Tube Vertical) Evaporators-

    The rising film evaporator is very similar to the falling film evaporator. It’s just the opposite of the falling film.

    The vertical shell and tube heat exchanger comprise a vertical shell and a tube heat exchanger, serving as a means for heat exchange.

    The concentrated liquid is fed at the bottom of the tube. Hence, increasing heat generates vapors and lifts the liquid upward, further separating the vapor and liquid.

  • Forced Circulation Evaporators-

    Forced circulation evaporators are used to separate a mixture which is not possible with the normal evaporating unit. Hence, the forced circular evaporator increases the velocity of liquid flow from 0.3 to 1m/s in the normal circular evaporator to 2 to 6m/s. Hence, it contains a circulation pump, making it suitable for both heat exchanger and flash separation. So, it separates the mixture without using normal conventional boiling. Therefore, it consists of a vertical shell and a heat exchanger tube with a centrifugal pump.

  • Plate Evaporators-

    Plane evaporators, comprising a plate and frame heat exchanger, primarily find application in the food and beverage industry. In a plate evaporator, a thin film of liquid passes and flows between the plates for the evaporation process. Hence, this type of evaporator commonly processes fruit juices, fruit puree, syrup, coffee, and milk.

  • Thermal Vapor Recompression(TVR)-

    A thermal vapor recompression evaporator reduces the steam required for the evaporation process by serving as a thermal compressor. So, a steam jet pump compresses the vapor stream to a higher temperature and pressure.

  • Mechanical Vapor Recompression (MVR)-

    In mechanical vapor recompression, the process involves compressing water vapor, leading to an increase in temperature and pressure. So, the rise in temperature makes the temperature difference between the vapor and the fluid. And, the further heat transfer results in a heat exchanger. Hence, the compressed vapor is again fed back to generate more steam. Therefore, this is an energy efficient and energy recovery process.

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