- They operate on electrical energy
- High energy efficiency thanks to the reuse of the generated vapor
- Crystallizer models with the lowest operating costs
MODELS AND MAIN TECHNICAL FEATURES
Our mechanical vapor recompression (MVR) crystallizers offer excellent performance in the treatment of concentrated brines and other high-salinity industrial effluents.
Our DESALT MVR FC model combines mechanical vapor compression with forced circulation to concentrate demanding aqueous effluents and crystallize dissolved salts. It offers excellent efficiency in processes where the equipment must operate continuously and energy consumption represents a significant share of operating costs, since by recompressing and reusing the vapor generated during evaporation, the system recovers heat to drive the process, virtually eliminating the need for external heating.
The DESALT MVR FC is part of a broad range of vacuum crystallizers for the management of wastewater effluents.
Each MVR evaporation unit is designed according to the composition of the wastewater, treatment capacity, and water and resource recovery objectives.
Technology: Mechanical Vapor Recompression (MVR) / Forced Circulation (FC)
Capacity (l/hour): 600 to 2.500
Electricity consumption per 1 m³ of distillate produced: 64 kWh/m³
Vacuum: ≈ 700 mbar
Evaporation temperature: ≈ 90 °C
MAIN OPERATIONAL ADVANTAGES
- MVR industrial crystallizers have the lowest electricity consumption, at 64 kWh/m³ of distillate. The energy cost of an MVR crystallizer is approximately one third of the energy cost of a heat pump unit, offering unparalleled performance in continuous operation.
- Forced circulation makes it possible to treat complex effluents, as the recirculation pump maintains a high flow rate through the heat exchanger to prevent scale formation. In this way, the crystallizer can treat streams with high contaminant loads that would clog other models within a matter of hours.
- MVR crystallizers are the electrical equipment with the highest capacity, far exceeding the effluent volumes that heat pump crystallizers can treat.
MAIN COMPONENTS OF DESALT MVR FC
The following video shows the DESALT MVR FC evaporator/crystallizer. The video highlights all the main components and benefits of industrial crystallization systems using mechanical vapor recompression.
OPERATION OF OUR MVR CRYSTALLIZERS
Effluent inlet and operating conditions
The residual effluent enters the crystallizer, where the operating temperature and the required vacuum conditions are reached. A preheater uses the heat recovered by the Roots compressor to heat the incoming product to be treated.
Heat exchange and evaporation
A circulation pump moves the liquid through an external heat exchanger, where it absorbs heat and is returned to the evaporation chamber. Some of the water evaporates in the low-pressure chamber. As water is removed, the solution becomes supersaturated, allowing salt crystals to form and grow.
Mechanical vapor recompression and heat reuse
The generated vapor passes through a demister before entering the compressor. Compression increases the vapor’s pressure and condensation temperature, allowing it to be reused as a heating medium in the external heat exchanger. There, it releases heat to the circulating liquid and condenses into recovered water.
Condensation, recovery and crystallization
The condensate is collected for potential reuse. A portion of the crystal concentrate is extracted for solid-liquid separation, while the remainder continues to circulate. The separated mother liquor can be returned to the process or managed separately, depending on its composition and the system design.
3D VIDEO ANIMATION
Below is a 3D video animation that explains step by step how our mechanical vapor compression evaporators work, from feeding the solution to be treated into the evaporator/crystallizer to extracting the distillate and concentrate from the system.