Sodium sulfate evaporation crystallization equipment

Working Principle

Sodium sulfate evaporation crystallization equipment primarily works by heating the solution to evaporate water, thus achieving a supersaturated state and crystallizing out sodium sulfate. Common working principles include:

Evaporation Method: Heating removes some solvent, achieving a supersaturated state. Suitable for sodium sulfate solutions where solubility does not change significantly with temperature.

Vacuum Cooling Method: Under vacuum conditions, the solvent flashes and evaporates while the solution is adiabatically cooled and crystallized. Suitable for substances like sodium sulfate where solubility increases at a moderate rate with increasing temperature.

MVR Technology: Mechanical vapor recompression technology compresses the secondary steam generated during evaporation, increasing its temperature and pressure, and then uses it as a heat source, resulting in significant energy savings.

Equipment Types

Multi-Effect Evaporation Crystallizer: Utilizes multiple evaporators connected in series, achieving sodium sulfate concentration and crystallization through multiple evaporation and condensation processes. For example, a triple-effect evaporator uses a series of evaporators (first, second, and third effects) to utilize the steam generated in each effect as a heat source for the next, improving energy efficiency.

MVR Evaporator Crystallizer: Employs mechanical vapor recompression technology to compress the secondary steam generated during evaporation, increasing its temperature and pressure, and then using it as a heat source, resulting in significant energy savings.

Forced Circulation Evaporator Crystallizer: Suitable for treating high-concentration sodium sulfate wastewater. A forced circulation pump improves evaporation efficiency, increasing the evaporation rate by 30%-50% while reducing energy consumption by 40%-60%.

DTB Crystallizer: Features a built-in guide tube for directional circulation, suitable for treating materials containing particulate matter. Its anti-scaling design extends operating cycles.

Oslo Crystallization System: Separates the evaporation and crystallization processes through a vertical dual-chamber structure, allowing crystals to grow continuously within a fluidized bed.

Equipment Features:

• Rapid Energy Saving: The application of multi-effect evaporation and MVR technology significantly improves energy utilization efficiency and reduces energy consumption.

• High Automation: Equipped with a PLC or DCS control system, achieving fully automatic operation, reducing manual intervention, and improving production efficiency.

• Strong Corrosion Resistance: Utilizes corrosion-resistant materials such as titanium and 316L stainless steel, extending equipment lifespan.

• High resource recovery rate: Sodium sulfate crystals have a high recovery rate and high purity, achieving resource utilization.

• Reduced wastewater discharge: The MVR sodium sulfate evaporator crystallizer does not require additional cooling water during operation, reducing wastewater discharge and helping to lessen the burden on the environment.

Application scenarios: Sodium sulfate evaporator crystallizers are widely used in chemical, pharmaceutical, and environmental protection industries, mainly for treating wastewater containing sodium sulfate, achieving sodium sulfate recovery and water resource reuse. For example, in high-salinity wastewater treatment, evaporation crystallization technology separates sodium sulfate from the wastewater, reducing the salinity of the wastewater and meeting environmental discharge standards.