Improving Steam economy in multiple effect evaporators

The operating costs of an evaporation plant is largely determined by the energy (steam and power) required to achieve the desired
evaporation/concentration.

The effluent feed arrangement in the evaporator can be selected in Backward, Forward, Mixed, or Parallel manner, depending on the
process conditions, to ensure maximum plant efficiency. Although small, the steam economy can also be improved by feed pre-heating
systems using the waste heat from process plants.

Apart from savings in motive steam due to multiple effects, the operation cost can be reduced further by use of Thermal Vapour
Recompressor (TVR), to improve the steam economy.