A newly developed sodium chloride double-effect evaporator is setting a new benchmark for energy-efficient concentration and crystallization in industrial salt processing and wastewater treatment applications. Designed based on advanced multi-effect evaporation theory, the system significantly reduces live steam consumption by reusing secondary steam generated during the evaporation process.
The double-effect evaporator operates through a co-current process. In the first effect, pretreated sodium chloride solution is heated by externally supplied live steam, causing evaporation under relatively high pressure. The resulting secondary steam, rich in latent heat, is then transferred directly to the second effect, where it serves as the primary heat source. This innovative reuse of energy allows one unit of live steam to be effectively utilized twice.
In the second effect, the system operates under a high-vacuum environment, lowering the boiling point of the sodium chloride solution to as low as 50–60°C. This enables efficient evaporation at lower temperatures, making the technology especially suitable for heat-sensitive or volatile-containing solutions. After two stages of concentration, the solution reaches supersaturation, allowing sodium chloride crystals to form. The resulting crystal slurry can be sent to a crystallizer or centrifuge to obtain dry salt products, while the condensate can be reused as high-quality process water.
One of the key advantages of the sodium chloride double-effect evaporator is its outstanding thermal efficiency. Compared with single-effect evaporation, steam consumption per ton of evaporated water can be reduced by more than 50%, delivering substantial operating cost savings. The system also features a high level of automation, integrating PLC or DCS controls for one-button operation, automatic discharge, CIP cleaning, and real-time fault alarms, ensuring stable, continuous performance with minimal manual intervention.
From an environmental perspective, the technology supports resource recovery by extracting sodium chloride from wastewater streams, transforming waste into valuable products. The final effluent is clean condensate, helping industries achieve the goals of reduction, recycling, and harmless treatment.
The evaporator system consists of key components such as a forced-circulation evaporator unit, heating chamber, separator, preheater, vacuum system, condenser, CIP cleaning system, and an advanced automated control platform. Special attention is given to anti-scaling design and material selection, with corrosion-resistant alloys such as duplex stainless steel or titanium commonly used to ensure long-term reliability.
With its combination of energy savings, environmental benefits, and intelligent control, the sodium chloride double-effect evaporator offers an advanced solution for modern industrial concentration, crystallization, and wastewater treatment challenges.
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