What is a Falling Film Evaporator?
A falling film evaporator refers to a concentration and evaporation device used in industries. It is applicable for the concentration and evaporation of water, organic solvents and solutions in the pharmaceutical, food, chemical, light industries and other industries, and it is especially suitable for heat sensitive materials and materials with higher concentration and higher viscosity. The equipment is continuously operated under vacuum and low temperature conditions, with high evaporation capacity, energy conservation and low operating cost. It can ensure that the material is invariable during the evaporation.
Classifications of Falling Film Evaporators
There are several kinds of falling film evaporators: single effect of falling film evaporator, double effect of falling film evaporator, three effect of falling film evaporator, four effect of falling film evaporator, five effect of falling film evaporator, six effect of falling film evaporator. It is suitable for milk, glucose, xylose, pharmaceutical, chemical, bioengineering, environmental protection engineering Low-temperature concentration in industries such as waste liquid recovery.
Construction of a Falling Film Evaporator
Due to the need of substances’ extraction and concentration in industrial field, there are so many types of evaporators in marketing. Even though there are so many different types of evaporators, their construction are very similar. Generally, the construction of evaporators includes a heat exchanger to heat the sample substances, a condenser to condensate the extracted substances, a separator to separate the mixed liquid and extracted substances, and a vacuum pump to provide a vacuum environment for the whole operating equipment.
What is a Falling Film Evaporator Used for?
Falling film evaporator is widely used in many fields, including industrial factories, chemical engineering, petroleum, and other fields. Falling film evaporator has high efficiency on the separation of substances, so it is used on milk, glucose, starch, pharmaceutical, chemical, biological engineering, environmental engineering, waste liquid recovery, and so on.
A falling film evaporator is a separation device, which is to uses ethanol as a washing solvent to extract, concentrate, or separate substances. Falling film evaporator consists of two types–vertical falling film and horizontal falling film. These two kinds of falling film evaporators have totally different structures.
There are several kinds of evaporators, which have similar functions and different structures. These evaporators all can separate, concentrate, and extract substances from mixtures with very high efficiency. But they have different structures and systems, let’s see them together.
The vertical falling film evaporator’s structure is vertical, which works from the top to the bottom. Vertical falling film evaporator is used on the recycling of industrial waste heat and also many fields such as energy, seawater desalination, refrigeration, and other fields.
Horizontal falling film evaporator works horizontally, which is opposite to vertical falling film evaporator. Horizontal falling film evaporator is widely used in chemical engineering, oil refining, seawater desalination, and other fields.
Wiped film evaporator is a new type of high-efficiency evaporator that is forced to form a film through a rotating wiper and flows at high speeds. It has high heat transfer efficiency and a short residence time (about 10 to 50 seconds). It can perform falling film evaporation under vacuum conditions.
A thin-film evaporator is a type of evaporator, which is characterized in that the liquid of the material flows along the wall of the heating tube to perform heat transfer and evaporation. The advantages are high heat transfer efficiency, fast evaporation speed, and short material residence time, so it is particularly suitable for heat sensitivity.
