Natural circulation vacuum evaporators

We supply natural circulation evaporators for the treatment of industrial wastewater and the valorization of solid waste that can be turned into raw materials or by-products.

Condorchem Envitech’s offer of natural circulation vacuum evaporator is based on the ENVIDEST MVR E series. They are an ideal equipment for treating low volumes of wastewater, since their capacity to produce clean water varies from 10 to 120 litres/hour.

Natural circulation evaporators are highly efficient for managing wastewater with low levels of pollutants, which contain components that can be easily evaporated with low boiling points, such as salts, certain organic waste, or chemical products.

In terms of specific applications, this equpment offers excellent results and good profitability in industries such as food processing, chemicals and pharmaceuticals. Natural circulation evaporators also offer a good performance in the production of pure water and the recovery of valuable products or raw materials from aqueous solutions.

Natural circulation evaporators are an excellent investment for companies thanks to the high quality of the recovered water and its durability.

Natural circulation evaporators work with electrical energy. They are easy to operate and require low maintenance.

Natural circulation evaporators work by applying heat to the industrial effluent, which causes the evaporation of the water and the concentration of the pollutants in the form of a solid residue. Natural circulation refers to the way in which the wastewater circulates inside the evaporator, since the movement of the effluent is produced by the difference in density between the denser solution at the bottom of the evaporator and the lightest solution at upper part.

The production of clean water that can be achieved with this line of evaporators ranges from 10 to 120 liters/hour. These systems are an excellent investment due to their combination of distillate quality, waste concentration capacity and robustness.

Vacuum evaporators can concentrate a residual effluent as many times as it is required, reaching zero liquid discharge if necessary. Thanks to this technology, industrial companies have an efficient solution to manage complex wastewater that can not be treated with more conventional techniques due to its lack of effectiveness or viability.

• 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

• Industrial painting: baths for degreasing, phosphating, passivation, washed water and eluted ion exchange resins.
• Food industry.
• Chemicals.
• Pharmaceutical and cosmetics.
• Metalworking and car parts industry: surface treatment baths, wash baths, finishing vibro water, compressor purges, water washed floors, oil emulsions.
• Die casting metals and light alloys: e.g. demoulding fluids, glycols and oil emulsions.

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.

Natural circulation mechanical vapor compression vacuum compressors are an excellent investment due to their combination of distillate quality, high technology and robustness. The distillate production capacity of this product line ranges from 10 to 120 L/h.

Natural circulation evaporators can be of two types, with horizontal or vertical tubes, which in turn can be upstream or downstream.

Both types of equipment are widely used in the treatment of industrial effluents and the choice of one or the other depends mainly on the type of wastewater to be treated.

The main differences are:

• One of the main differences is how the wastewater moves through the evaporator. In natural circulation evaporators, the movement of the effluent is caused by the difference in density between the denser solution at the bottom of the evaporator and the lighter solution at the top. On the other hand, in a forced circulation evaporator, the movement of the effluent occurs through the use of pumps or fans that circulate the wastewater through the evaporator.
• Forced circulation evaporators have a higher evaporation efficiency, since the forced movement of the effluent through the evaporator increases the contact surface between the water to be treated and the air, which facilitates evaporation. Additionally, forced circulation evaporators can operate at higher pressures, further increasing their evaporation efficiency.
• Forced circulation evaporators are more compact and have a lower construction cost than natural circulation evaporators because they do not require as much contact surface between effluent and air.
• In general, natural circulation evaporators are an economical and suitable option for treating industrial wastewater with low levels of contaminants and a high content of salts or chemicals. On the other hand, forced circulation evaporators are more suitable for treating effluents with high levels of contaminants or difficult-to-evaporate components because they are more efficient and can operate at higher pressures.