In the fertilizer industry, rare earth and many other chemical production processes, a certain amount of ammonium chloride wastewater is generated. Due to the high content of ammonia nitrogen and the presence of chloride ions in ammonium chloride wastewater, direct discharge will cause certain pollution to the water body. As the discharge volume continues to increase, the degree of pollution also increases, and the treatment of ammonium chloride wastewater is a major challenge. The use of evaporation concentration process results in high steam consumption and severe corrosion of the material by ammonium chloride solution. Among them, the evaporator form using multi effect evaporation is more common. But in recent years, with the rapid rise in steam prices, the energy consumption of this evaporation process has also greatly increased the burden on many enterprises. Therefore, it is urgent to find an efficient and energy-saving evaporation technology.

Jiejing Energy has conducted special research on the treatment process of ammonium chloride wastewater and developed a new generation of MVR evaporation and concentration equipment. The MVR evaporation process, combined with corrosion-resistant titanium material as the main material of the equipment, has achieved stable, energy-saving, and durable good results in multiple engineering projects.

The basic principle is to compress the secondary steam separated from the crystallizer through a compressor, which increases the temperature and pressure, increases the enthalpy, and then enters the evaporator heating chamber to condense and release latent heat. The liquid on the heated side also receives heat and boils to vaporize, producing saturated gas (i.e. secondary steam). The secondary steam enters the compressor after passing through the separator, and the above process is repeated. At the same time, the condensed water can also preheat the raw materials entering the system, which can fully recover and utilize the latent heat of steam, achieving the goal of energy conservation and consumption reduction, while also eliminating the need for a cooling water system.