Microwave vacuum drying equipment represents an innovative application of microwave technology, integrating the benefits of both microwave and vacuum drying systems. This advanced system overcomes the limitations of traditional vacuum drying, such as long processing times and low efficiency. During operation, it offers high drying yields, superior product quality, and reduced processing costs. As a high-tech solution, it combines multiple disciplines, including electronics, vacuum science, mechanics, thermodynamics, and automated control. The technology is based on a deep understanding of physical changes in materials during drying, heat and mass transfer processes, and moisture movement under vacuum conditions. In industrial settings, many products—such as certain medicines, chemicals, nutritional foods, and high-end traditional Chinese medicines like ginseng and deer antler—cannot be dried at high temperatures. To preserve their quality, drying must occur at temperatures below 100°C or even at room temperature. Under vacuum conditions, the boiling point of water decreases significantly. For example, while water boils at 100°C at atmospheric pressure (101.3 kPa), it only needs to reach 40°C at 7.37 kPa. In such environments, heating causes internal moisture to evaporate without raising the material’s temperature. However, since convection is limited under vacuum, heat is transferred mainly through conduction, which is slow and inefficient. This often leads to uneven temperature distribution within the material. Microwave heating, by contrast, is a direct form of radiant heating. It interacts with the material itself, allowing for simultaneous internal and external heating without relying on convection or conduction. This results in faster drying speeds, higher efficiency, and better product quality. Developed countries like the U.S., France, and Japan began exploring this technology in the 1980s, achieving significant success in real-world applications. For instance, the University of California used microwave vacuum drying to process seedless raisins, reducing drying time from 24 hours at 65°C using hot air to just 5 hours at 50°C, greatly improving product quality. Similarly, the French company International Microwave developed a 2450MHz, 48KW microwave vacuum dryer that produces instant orange powder with excellent color, flavor, and vitamin retention compared to spray drying. Domestically, research into microwave vacuum drying started in the late 1980s, and by the early 2000s, key challenges such as arc discharge in low-pressure environments, temperature differences between material layers, and non-contact temperature measurement were successfully addressed. This allowed the technology to move from experimental stages to industrial production. Today, it plays a vital role in food engineering, pharmaceuticals, biotechnology, chemical processing, and agricultural product development, offering a highly efficient drying solution. Key advantages of microwave vacuum drying include: 1. **High Efficiency**: Unlike conventional vacuum drying, which relies on slow conduction, microwave heating uses radiation to directly heat the material, significantly reducing drying time and energy consumption. It can improve productivity by more than four times compared to traditional methods. 2. **Even Heating**: Since microwaves heat the material from the inside out, there is minimal temperature difference between the surface and core, ensuring uniform drying and improved product quality. 3. **Easy Control**: Microwave systems allow for rapid power adjustments and precise control, making them ideal for continuous and automated production. 4. **Compact Design**: The equipment is small, easy to install, and requires minimal maintenance. 5. **Superior Product Quality**: Compared to conventional methods, the final products maintain better color, texture, and nutritional value. 6. **Disinfection and Sterilization**: Microwaves also have antimicrobial properties, enhancing product safety and extending shelf life. These features make microwave vacuum drying not only economically beneficial but also environmentally friendly and socially valuable. Table 1 shows the performance comparison between microwave vacuum drying and other drying technologies in terms of efficiency, cost, and product quality. With its high efficiency, energy savings, improved quality, and safety, microwave vacuum drying has great potential for widespread adoption. Our company has developed a series of microwave vacuum drying equipment ranging from 2KW to 100KW, which has been approved by relevant state authorities. These advanced systems are now being deployed across various industries and research institutions, contributing to China's national economic development.

Cargo Tricycle

Tuk Tuk Cargo Tricycle,Electric Tricycles,Electric Tricycle Truck,Eec Tricycle

Xuzhou Hengshang Mechanical and Electrical Co., Ltd. , https://www.hengsenergy.com