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Multi Effect Evaporator – Principle, Plant Selection And Advantages
Multi-effect evaporation process which is thermal in nature and has amazing uses like concentration of several liquids in different forms like solution, emulsions concentration and suspension which are performed by vaporizing a solvent which is water normally, from any mixture. For most of the cases, the final output is the result of concentrating from the evaporation method.
There can be two types of Multi effect Evaporation:
• Film Type Evaporation
• Suppressed Boiling Type Evaporation
In first method, a thin product film is generated which is used for generating minimal resistance against heat-transfer. The goal is to create optimum film boiling inside the film of evaporator. To fulfill this purpose, the parameters are set at that optimum point. There are certain cautions which are required to be followed which ensure a uninterrupted hydraulic state of films. Also, it is desired to stop the useless boiling which can fall down the rate of feat transfer. The quality of the liquids needs to be maintained throughout the process. The great quality can further save the heat damage from concentration.
Plant Selection for Multi Effect Evaporation:
The design of the multi effect evaporator is extremely important for a plant to run. There are several factors which are not basic at times are required for a successful operation of the plant. Essential requirements for the Multi Effect Evaporation are as following:
• Basic characteristics of the product such as heat sensitivity, corrosiveness, viscosity, fouling, boiling behavior, precipitation and forming tendency are important to start the process.
• Other than above, other features like capacity of the plant and the data required for the operation is important such as quantities, temperatures, concentration degree, change of the product, automation controlling factors, required media for the operation, yearly operating hours. Also physical properties like steam, electricity power, spare parts and coolants or cooling water are needed to be known.
• Major factors to start a plant of multi effect evaporator are capital and financial costs. The cost includes installing the system, continuous running of the system and maintain it to prevent the fatigue of the system which can impact the working of the industry negatively.
• To run the system, man-power is required which must be taken in the account to start any project involving Multi Effect Evaporators.
Advantages of Multi-effect evaporator:
There are various advantages of Multi-effect evaporator. Few of them are as following:
• The energy utilization is comparatively less in this kind of evaporator.
• It works perfectly for large scale operations which need to be operated continuously.
• It is a great method of extracting water and other present liquids from different solutions.
• This process is the ideal in the process of kraft pulping where sodium hydroxide is recovered.
• It is quite cost-effective as compared to single-effect evaporators.
• Multiple stages (effects) are widely used for reducing the energy resources which are essential to vaporize or fume off detrimental water contents.
• In foods and chemicals industries, this process is frequently used for the concentration purpose and producing rescue solvents.
• The quantity of waste material gets reduced with the evaporation method by eliminating moisture.
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