The material liquid to be concentrated is pumped into the top of the heating tubes and flows downward along their walls as liquid film. In this process, the liquid film inside the tubes begins to boil and partially evaporate being heated from outside the tubes. The remaining liquid and vapor are further removed in subsequent separating machines. Reasonably determined material liquid flow prevents bottom section of tubes from getting excessively dry while ensuring optimal thickness of liquid film so that best heat exchange effect and minimum power consumption is achieved. Falling film evaporator is applicable to both cyclic evaporation and one-way evaporation processes. ApplicationsCapacity of single set can reach 200t/h.Suitable for heat sensitive materials.Suitable for materials with low concentration, low solid content and low scaling.

As raw material (liquid) circulates among heating and separation chambers at a high speed under the function of a circulating pump, it is heated up in the heating chamber and flashes in the separation chamber to achieve high-efficiency vapor-liquid separation. The flow rate in the heat exchange tube is high, which effectively improves the heat transfer efficiency. The evaporation process is conducted in the separator instead of heater. As a result, fouling caused by crystallization and precipitation of materials in the tubes is reduced. Forced circulation evaporator is especially suitable for materials that are easy to scale due to high viscosity, and can be used as a high-efficiency concentration device for multi-effect evaporation.

The raw material liquid and the circulating mother liquid are conveyed to the heater for heating through the circulating pump, and then goes into the FC crystallizer. Part of the crystal slurry is discharged from the cone bottom of the crystallizer, and the mother liquid that is not discharged is returned to the crystallizer by the circulating pump through the circulating pipe, and the continuous crystallization process is realized by the circulating pump. This kind of crystallizer with high capacity can enhance the heat transfer effect, and is effective for high-density and high-viscosity solutions. It is suitable for the evaporation crystallization treatment of high-salt wastewater with complex components and low requirements on the salt particle size.

By structural design, OSLO evaporation crystallizer separates supersaturation generation area and crystal growth area. Under the action of circulating mother liquor in the growth area, the fluidization effect of crystal size classification is formed, so that large-size crystal are enriched and discharged at the bottom of the crystallizer. This type of crystallizer can realize the screening of crystal size, and is suitable for materials with simple crystal composition, good fluidity, and high requirements for salt quality.

MVR Evaporator (Mechanical Vapor Recompression) greatly reduces energy consumption of the evaporation system. Secondary steam generated by evaporation, after being compressed by a steam compressor so that its pressure, temperature and enthalpy increase, enters the heating chamber of the evaporation system as heat source. The process repeats itself during operation.

Multi-effect evaporation is a mature and reliable evaporation process using secondary steam energy repeatedly. Its combination with different vapor-liquid separator and crystallizer can achieve concentration and crystallization process of different materials to meet various processing requirements.

The production of food, chemical and other industries generally yield secondary heat. Through reasonable process design, this secondary heat can be recovered and used by evaporation system to improve environmental performance.

Energy saving can be achieved to some extent by using TVR (Thermal Vapor Recompression) technology. High-speed steam flows through the steam injection pump while part of the secondary steam generated in the separator is expelled and mixed into the heating chamber as a heat source to heat the material liquid.