Forced circulation vacuum evaporators

Introduction to technology

Forced circulation evaporators are especially indicated when the flow to be treated contains fouling substances, viscous liquids, crystals or other components preventing natural circulation.

This mechanical vapor compression equipment has the least energy consumption and can treat greater flows (up to 20,000 L/h).

Forced circulation vacuum evaporators allow high quality water to be separated from a waste effluent with relatively concentrated contaminants by the application of thermal energy. Working under vacuum conditions reduces the boiling temperature, thereby reducing energy consumption.

Using vacuum evaporators, a waste effluent can be concentrated efficiently and easily as many times as required, resulting in zero discharge if required. Vacuum evaporation is a technology to treat effluents which cannot be treated by the most conventional techniques which are not effective or viable due to the effluent complexity.

Condorchem Envitech Offer

Condorchem Envitech’s Forced circulation mechanical vapor compression vacuum evaporator range is focused on the ENVIDEST MVR FC series, with flow rates from 250-2,000 L/h per modular unit.

This forced circulation evaporator It has a vertical boiler made of AISI 316L, the steam is compressed by a Root pump and the heat of the steam is used to heat the fluid to be treated by a plate exchanger manufactured in AISI 316L.

Our evaporators

Advantages and applications

Advantages

  • Minimization of the waste volume to be managed
  • Significant reduction in waste management costs
  • Production of an excellent quality distillate
  • Possibility of implementation of a zero discharge system
  • Fulfillment of the current regulations on discharge of effluents
  • Reduction in greenhouse gas emissions when transporting the waste
  • Low maintenance and little need for supervision

Applications

  • Water with a high content of oily substances
  • Water with a high content of heavy metals
  • Water with a high content of dissolved salt
  • Dissolved oils and hydrocarbons in contaminated water
  • Mixtures suspended in water
  • Treatment of leachates
  • Degreasing water

Functioning/operation of technology

The operation of the mechanical vapor compression vacuum evaporators is based on the recovery of the condensation heat from the distillate as a source of heat to evaporate the feed.

In these systems, the process starts with the external energy supply to the evaporator to start the evaporation process. The operation of the mechanical vapor compression vacuum evaporators is based on the recovery of the condensation heat from the distillate as a source of heat to evaporate the feed. The steam produced is extracted and compressed by a volumetric compressor with the intention of increasing its temperature. This superheated steam is then returned to the evaporator as a heating fluid. Once the cycle has begun, no more external heat input is required, as the mechanical compression of the steam provides enough heat to maintain the evaporation of the liquid. Upon passing through the exchanger of the evaporator itself, this compressed, and therefore superheated, vapor has two effects: (1) it heats the liquid to be evaporated and (2) it condenses, thereby reducing the need for a refrigeration fluid.

The main advantage of mechanical vapor compression vacuum evaporators lies in the fact that the energy consumption of the volumetric compressor is lower than the cost of producing steam for multi-effect evaporation systems. However, the volume to be evaporated must be high enough so that the saving generated compensates for the investment in the volumetric compressor.

Forced circulation mechanical vapor compression vacuum evaporators have a low energy consumption and can treat high flow rates, up to 2,000 L/h. They are especially useful when the flow to be treated contains fouling substances, viscous liquids, crystals or other components preventing natural circulation.

Forced circulation evaporator design

Envidest MVR FC