Seven-effect Falling-film Evaporator: An Advanced Technology for High-efficiency Evaporation

Working Principle

The seven-effect falling-film evaporator of Henan Jiuye Chemical Equipment Co., Ltd. is composed of seven effect bodies and a unique two-stage evaporation structure. During the operation of the entire evaporation system, the raw liquid is divided into two parts and enters the evaporation system. One part of the raw liquid is fed into the raw liquid flash evaporator, and after evaporation and concentration in the VII effect and VI effect, it is discharged from the VI effect; the other part is fed into the V effect, and successively passes through the evaporation and concentration in the IV effect, III effect, II effect, I effect, Grade I, Grade II, Grade III, Grade IV and Grade V flash evaporators, and is finally discharged from the Grade V flash evaporator. In each evaporator, the liquid material enters the liquid distribution device from the top, is evenly distributed into each heating tube, and flows down along the inner wall of the tube in the form of a film. The liquid film evaporates and vaporizes due to the heat transferred from the tube wall, and the generated steam usually flows downward in parallel with the liquid film, achieving continuous evaporation and concentration.

Technical Characteristics

?Energy-saving and High-efficiency: The seven-effect evaporation design, combined with the two-stage process, enables the cascading utilization of heat energy. In the multi-effect evaporation system, the secondary steam generated by each effect evaporator can serve as the heat source for the next effect, and the latent steam heat is reused. Compared with traditional evaporators, it can significantly reduce energy consumption and the operating costs. For example, in the large-scale production process of alumina, it can stably save a large amount of energy expenses for enterprises over a long period.

?High Evaporation Efficiency: The solution flows in the form of a film inside the heating tubes and does not fill the entire cross-section of the tubes. The amount of liquid material passing through can be relatively small. Moreover, the heat transfer coefficient of the liquid film is high, there is no hydrostatic pressure of the liquid column, and the temperature difference for heat transfer is large. Therefore, good heat transfer effects can be achieved, and a relatively high evaporation rate can be realized, making it suitable for handling large flow rates of materials.

? Adaptability to complex materials: The split structure enables it to flexibly handle different production sites and process conditions. For factories with limited space, the split devices can be arranged flexibly. For materials with different properties, whether they are high - viscosity, easy - to - crystallize or heat - sensitive solutions, stable and efficient evaporation and concentration can be achieved through process optimization.

?Backed by patented technologies: Relevant enterprises have conducted in-depth research on the film distributor, defoamer, new-type evaporative condenser, and the complete recycling of high-quality primary condensed water around this evaporator, and have applied for a number of patents. These patented technologies optimize the performance of the evaporator in all aspects. For example, the precise film distributor can ensure that the solution is evenly distributed on the heating surface, improving the evaporation efficiency; the high-efficiency defoamer effectively separates the droplets in the steam, ensuring the quality of the steam; the new-type evaporative condenser enhances the condensation effect and improves the overall operational stability.

?Product Quality Assurance: Since the material evaporates in the form of a film inside each tube, the heating time of the liquid material is extremely short. This is particularly advantageous for the evaporation and concentration of heat-sensitive materials in industries such as food and pharmaceuticals. It can preserve the nutritional components and active ingredients of the materials to a large extent. At the same time, it can also prevent problems such as deterioration and discoloration of the materials due to long-term exposure to heat, thus ensuring the product quality.

?Superior Environmental Performance: The evaporation process is carried out under the action of vacuum, which not only ensures the hygienic requirements of the materials but also reduces the evaporation temperature, minimizing the emission of volatile components in the materials. At the same time, it also reduces the thermal pollution to the environment. In addition, part of the secondary steam is reinhaled into the shell side of the first-effect evaporator by the jet thermocompressor, enabling the full utilization of heat, reducing the consumption of steam, and thus further decreasing the impact on the environment.

Application Areas

The seven-effect falling-film evaporator of Henan Jiuye Chemical Equipment Co., Ltd. is applicable to multiple industries such as chemical engineering, pharmaceuticals, food, and non-ferrous metals. In the chemical engineering industry, it can be used for the concentration and purification of various chemical raw material solutions. In the pharmaceutical industry, it is commonly used for the evaporation and concentration of pharmaceutical intermediates, active pharmaceutical ingredients, etc. In the food industry, it can be applied to the concentration of fruit juices, milk, syrups, etc. In the non-ferrous metals industry, such as in the production of alumina, it is used for the evaporation and concentration of mother liquor, featuring remarkable characteristics of high efficiency, energy conservation, and consumption reduction.

Development Prospect

With the continuous development of industrial technology and the increasingly higher requirements for energy conservation and environmental protection, the seven-effect falling-film evaporator of Henan Jiuye Chemical Equipment Co., Ltd., by virtue of its advantages such as high efficiency in energy conservation and a wide range of adaptability, will have a broader application prospect in the field of industrial evaporation. In the future, this technology is expected to achieve new breakthroughs in further improving energy utilization efficiency, reducing equipment costs, optimizing operation processes, and other aspects, providing more powerful support for the development of various industries.

The seven-effect falling-film evaporator of Henan Jiuye Chemical Equipment Co., Ltd., with its unique technical characteristics, has demonstrated powerful advantages in industrial production. It provides an effective solution for achieving an efficient, energy-saving and environmentally friendly evaporation process, and is one of the important technologies that drive the development of related industries.