Multiple result evaporator is an apparatus for efficiently using the warmth from steam to evaporate water to concentrate dissolved salts in the water. In multiple impact evaporator, water is boiled in sequence of vessels, each held at lower pressure than the last. As boiling of water decreases with pressure, vapor made in one vessel can be used to heat the following vessel. Only initial vessel needs the source of external heat.
Advantages:
- Ease of operation
- Most proven system for evaporation
For better energy utilization, the following are used: Multi impact evaporation using thermal vapor recompression (TVR), evaporation with mechanical vapor recompression.
Solvent stripped effluent shall be fed to the MEE along with RO rejects for any evaporation to induce product of 30% solids. Four impact evaporator with each of the calendria forced circulation kind. Every calendria shall be given separate vapor separator. Water vapor condensed in condensers and collects separately for further treatment in ETP.
The evaporation method itself involves each a thermodynamic and mass transfer phenomena. The thermodynamic phenomenon of evaporation involves providing enough heat energy (waste oil, off-spec gas, natural gas, propane, oil, diesel, electricity, or steam) to convert water to water vapor. The mass transfer phenomenon of evaporation can best be described because the “carry off” of tiny droplets of water.