Sodium Sulfate MVR Single-Effect Evaporator

In industries such as chemical, pharmaceutical, and environmental protection, the treatment of sodium sulfate wastewater has always been a major challenge for enterprises. Traditional evaporation equipment is not only energy-intensive and requires a large area, but also has low automation and is difficult to operate. To address this pain point, we have launched the sodium sulfate MVR single-effect evaporator, which employs advanced mechanical vapor recompression (MVR) technology to provide customers with a highly efficient, energy-saving, and environmentally friendly evaporation crystallization solution.

I. Core Technology Principle of Sodium Sulfate MVR Single-Effect Evaporator

MVR evaporation crystallization technology is an internationally recognized new type of energy-saving evaporation device developed in the late 1990s. Our sodium sulfate MVR single-effect evaporator utilizes a high-efficiency steam compressor to compress the secondary steam generated by evaporation. By increasing the enthalpy of the secondary steam, it is re-injected into the heater to reheat the raw liquid. The heated raw liquid continues to evaporate, generating secondary steam, forming a continuous evaporation cycle. This technology efficiently converts mechanical energy into thermal energy, fundamentally solving the problem of excessive energy consumption in traditional evaporators.

Anhydrous sodium sulfate (Na₂SO₄, also known as Glauber's salt) exhibits minimal solubility variation within a temperature range of 80-200℃, and its boiling point rises relatively low after saturation. Combined with its low corrosiveness, this makes it a naturally advantageous material for MVR evaporators. Our equipment fully utilizes this physical property of sodium sulfate to achieve a low-energy, high-efficiency evaporation and crystallization process.

II. Advantages of Sodium Sulfate MVR Single-Effect Evaporator Technology

1. Significant Energy Savings

Theoretically, using an MVR evaporator can save 60%-80% or more in energy consumption compared to a traditional evaporator, while saving over 95% of cooling water and reducing floor space by over 50%. The low boiling point of sodium sulfate results in very low power consumption for the steam compressor, demonstrating excellent economic performance.

2. Flexible Process Configuration

We offer various equipment configurations to suit different feed concentrations and impurity contents:

Pure high-concentration sodium sulfate solution:** Single-stage forced circulation evaporator crystallizer

Pure low-concentration sodium sulfate solution:** Falling film + forced circulation evaporator crystallizer with shared compressor

Impurity enrichment and high final boiling point:** Multi-stage evaporator with shared compressor

3. Highly Automated Control

The system achieves automated control through PLC, industrial computer (FA), and configuration, maintaining the energy balance of the entire system. Operators can complete the entire evaporation and crystallization process simply by operating the control panel.

III. Application Areas of Sodium Sulfate MVR Single-Effect Evaporator

This equipment is widely used for the evaporation treatment of sodium sulfate-containing solutions in industrial wastewater. It is also suitable for producing sodium sulfate from salt lake brine and producing anhydrous sodium sulfate (Glauber's salt) from well salt brine. Anhydrous sodium sulfate is obtained through direct thermal evaporation and crystallization, eliminating the need for freeze crystallization. This is particularly suitable for scenarios with low impurity levels in the feed water and less stringent requirements for product purity.

IV. Economic Benefit Analysis of Sodium Sulfate MVR Single-Effect Evaporator

Taking a 200-ton/day RO concentrate treatment project in Xinjiang as an example, after adopting MVR evaporation and crystallization technology, the power consumption per ton of water is only 55 kWh, the steam consumption is 0.18 tons/ton of water, and the product purity reaches 99.2% sodium sulfate. The investment payback period is only 2.3 years.

Our sodium sulfate MVR single-effect evaporator not only helps enterprises achieve zero wastewater discharge, but also transforms waste into valuable industrial raw materials, truly achieving a win-win situation for both economic and environmental benefits.