MULTIEFFECT EVAPORATOR (MEE)

Evaporation is a process to concentrate a non-volatile solute from a solvent (water) by boiling off the solvent. It is special case of heat transfer to a boiling liquid to result in separation of a liquid mixture into a liquid product (concentrate or thick liquor) and a vapor
The design of an evaporator should be with the objective of economy. The chief factor to obtain the economy/efficiency of an evaporator system is to increase the number of effects such that the vapours obtained from first effect act as a heating medium for another effect.

The operating costs of an evaporation plant is largely determined by the utility/energy (steam and power) required to achieve the desired evaporation/concentration. Apart from the motive to save steam, its operation cost can be reduced further by use of Thermal Vapour Recompressor (TVR), to improve the steam economy which uses the dead vapours and gives the same steam/energy saving as an additional evaporation effect.

Although small, the steam economy can also be improved by feed pre-heating systems using the waste heat from process plants.

WE DESIGN A RANGE OF EVAPORATOR SUCH AS SINGLE EFFECT AND MULTIPLE EFFECTS AS PER THE NEEDS OF VARIOUS PROCESS INDUSTRIES:

• Vertical Tube Evaporator.
  1. Falling Film
  2. Rising Film
• Forced Circulation Evaporator
• Horizontal Tube Evaporator
• Plate Type Evaporator

PRINCIPLE OF MEE

When the heated steam passes into an evaporator, the solution is heated while the secondary steam pressure and temperature are lower than the original heating steam, the secondary steam can still be used as the heating steam (As long as the evaporation chamber pressure and the boiling point of the solution are lower than those of the original evaporator) and introduced into next evaporator. Similarly, the new secondary steam produced by the second evaporator can also be used as the heating steam of the third evaporator. In this way, each evaporator is called a single effect, and a plurality of evaporators are connected together to form a multi effect evaporation system.

The first heat exchanger with the primary steam is called the first effect, and the second heating exchanger with the secondary steam generated from first effect is called the second effect… and so on.

The utility model has the advantages of cyclic utilization, repeated utilization of heat energy, and remarkable reduction of heat energy consumption, thus greatly reducing the cost and increasing the efficiency.