Evaporators are often classified as follows:

1. separated by means of heating evaporation of liquid heating tube surfaces,
2. limited by means of heating coils, jackets, double walls, flat plates, etc.
3. means of heating put in direct contact with the evaporation of liquid, and
4. heating with solar radiation.

Evaporators with heating tube surfaces dominate the field. The circulation of the liquid over the surface can be induced by boiling (natural circulation) or by mechanical means (forced circulation). In forced circulation, boiling may or may not be on the surface of heating

Solar evaporation requires huge areas of land and a relatively cheap material first, as losses of tin can be substantial. Solar evaporation is usually only possible for the evaporation of natural brines, and then only when the water vapor is evaporated into the atmosphere and not be recovered.

Evaporators can be operated batchwise or continuously. Evaporator Most systems are designed for continuous operation. Batch operation is sometimes used when small quantities must be evaporated. Batch operation generally requires more energy than continuous operation.

Evaporators Batch, strictly speaking, are managed so that the filling and evaporation, and discharge phases are consecutive. This method of evaporation requires that the body must be sufficiently large to hold all of the Office of the feed and the heating element to be placed low enough not to be discovered when the volume is reduced to that of the product. Operation of the lot may be used for small systems, for products that require large residence times, or products that are difficult to manage.

A more common method of operation is semibatch in which the output is continuously added to maintain a constant level of liquid until all the charge reaches the final concentration. Continued batch evaporators usually have a continuous feed, and at least part of the cycle, a continuous discharge. A method of operation is to spread from a storage tank to the evaporator and forth until the tank is full at that fixed and then complete the evaporation in batches.

Evaporators have continuous feed and continuous discharge. The concentrations of feed and discharge remain constant during operation.

Evaporators can be used as once through the drives or the liquid can be recirculated through the heating element. At once all transactions through the evaporation occurs in a single pass. The ratio of evaporation is limited to power in single-pass operation, single-pass evaporators are well suited to the operation that allows multiple effects the total concentration of the liquid to be achieved in different effects. Agitated Film Evaporators are often managed through once. Once-through evaporators are often required when handling materials sensitive to heat.

Recirculation systems require that a pool of liquid held within the equipment. Feed mixes with the liquid pool and the mixture circulates through the heating element. Only part of the liquid is vaporized in each pass through the heating element; unevaporated liquid is returned to the pool. All the liquor in the pool is therefore the highest concentration. Recirculation systems are therefore not suitable for the evaporation of heat sensitive materials. Evaporators recycled, however, can operate over a wide concentration range and are well suited to evaporation way.

There is only one type of evaporator, which is satisfactory for all conditions. E ‘for this reason that there are many types and models. Several factors determine the application of a particular type of a specific result of evaporation. The following sections describe the various types of evaporators in use today and discuss the applications for which each design is more suitable.

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