Evaporation is a process that is used to concentrate on the solution of a solvent. The solvent is usually water. The solvent is further vaporized to produce a concentration solution. Evaporation is very much different from distillation because evaporation doesn’t involve the separation of vapors into components. An evaporator consists of a heat exchanger, valves, manifolds, controls, pumps, and a condenser.
Evaporators are used in various processes including pharmaceuticals, foods and beverages, pulp and paper, chemicals, polymers and resins, inorganic salts, acids, bases, and many other things. In this article, we will discuss the various types of evaporators, their advantages and disadvantages, and their applications.
1. Falling Film Evaporator:
Applications of Falling Film Evaporator:-
the main applications for falling film evaporators are the concentration of dairy products such as whey, milk protein, skim milk, cream, and hydrolyzed milk. Sugar solutions, urea, phosphoric acid, and black liquor.
2. Forced Circulation Evaporators:
Applications of Forced Circulation Evaporators:-
The typical applications of Forced Circulation evaporators are sodium sulfate, urea, sodium chloride, ammonium sulfate, magnesium chloride, citric acid, and caustic potash.
3. LTV Evaporators:
Applications of LTV Evaporators:-
Some of the common uses of Long Tube Vertical Evaporators are the concentration of cane sugar syrups, black liquor in paper plants, nitrates, and electrolytic tinning liquors.
4. Plate Evaporators:
Applications of Plate Evaporators:-
Typical applications of gasketed plate evaporators are stripping applications, removing monomers from polymers, and deodorization. It is typically used for fruit juices, fruit puree, syrup, coffee, and milk.
5. Mechanical Vapor Recompression (MVR):
Mechanical Vapor Recompression (MVR) is a type of evaporator in which the water vapor is compressed, which results in the rise of temperature and pressure. The rise in temperature makes the temperature difference between the vapor and the fluid. The further heat transfer results in the heat exchanger. The compressed vapor is again fed back to generate more steam. This is an energy-efficient and energy-recovery process.
Applications of MVR:-
The dairy industry, the brewing industry, sugar industry, saline industry, pulp industry, chemical industry, alcohol industry, etc.