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Evaporators for fruit and vegetables concentrate

To reduce the transport costs for worldwide distribution, juices and sauces are usually concentrated. Concentration consists of reducing water content in a liquid or solid. This water is later on restituted.

MachinePoint Engineering supplies various types of evaporators depending on the product that needs to be evaporated. We can say there are mainly two types of products, the ones with low pulp contents (less than 2%) such as orange juice, pineapple juice, grape juice, etc. And the ones with high solid content such as mango, peach, strawberry, tomato, etc.

Evaporating fruit and vegetable juices is challenging as viscosity increases significantly as they get concentrated.

Falling film evaporators

These types of evaporators are used to concentrate liquids with low solid content and heat sensitive components.

The liquid enters the evaporator at the head and then a thin film of the product to be evaporated flows down the side of the heat exchanging tubes. Steam condenses on the outside of the tubes supplying the required energy to the inside of the tubes.

Another system is the multi-effect evaporator; where the pressure is incrementally lowered in each stage, thus pushing the boiling point lower gradually. This one can have between one and five different effects.

Vapor recompression evaporators are used when we want to achieve maximum energy efficiency.

Forced circulation evaporator

This evaporator is designed for the evaporation of liquids with a high solid content, high viscosity, or a tendency to spoil. They are also used for crystallizers.

The system is often used as a finishing evaporator for the concentration of liquids to a high solid content, followed by a low solid multi-stage, TVR evaporator (Termal vapor Recompresion) or MVR evaporator (Mecanical vapor recompresion).

Boiling in the Forced Circulation evaporator is suppressed in the heat exchanger by backpressure and takes place when the liquid enters the lower pressing separator chamber.

The flow velocity in the tubes must be high, and high-capacity pumps are required.

MachinePoint Engineering develops fully automated evaporators controlled by microprocessor and with high quality refractometers.


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