Drying is a way to protect food from deterioration, and it should be widely used in food processing. With the continuous development and expansion of the food industry, the demand for food drying equipment has also gradually increased. At present, China's food drying equipment has reached more than 80% of the domestic market, playing an important role in various food processing. Microwave drying has gained more and more attention in various fields of drying because it is relatively easy to realize automation and improve product quality.
Microwave drying is different from traditional drying methods in that the direction of heat conduction is the same as the direction of moisture diffusion. Compared with the traditional drying method, it has the advantages of large drying rate, energy saving, high production efficiency, uniform drying, clean production, easy realization of automatic control and improvement of product quality. As far back as the 1960s, foreign countries have conducted extensive research on the application and theory of microwave drying technology, and have further developed in recent decades. The research of microwave drying technology in our country started late, and there is a certain gap compared with foreign countries. Although a lot of achievements have been achieved, the application research field of microwave drying technology is narrow, and most of them stay in the experimental stage or small-scale production stage. Composite microwave drying The research of technology needs to be expanded, and the theoretical research of mass transfer and heat transfer in microwave drying is not enough. The development of equipment and instruments supporting microwave drying technology needs to be strengthened. In addition, although microwave drying has made great progress in the theoretical research on the application of natural rubber drying, there are still many problems to be solved in its scale, continuousization, and automation. The microwave drying of rubber molecular structure, non-rubber components and products The impact of process performance, etc. needs further study. These are the research priorities of the industry in the future.
Microwave dryer can be subdivided into three categories
First, it is used for the processing of agricultural products with high added value: such as dehydrated vegetables, dehydrated meat products, and dehydrated seafood, these semi-finished products or products produced by the microwave dryer method are very light in weight, rehydration performance is very good, and the color after rehydration Fresh and original state, and easy to carry, store and transport, can be stored at room temperature for 3 years. These processed dehydrated products. As an upscale ingredient. It can be used as a condiment package for convenience foods such as instant noodles and instant rice noodles.
Second, it is used for the production of condiments: If ginger and garlic are treated at high temperatures, the pungent substances in these two materials are easily destroyed, resulting in a decrease in their content. If the microwave dryer is used for the treatment of garlic and ginger, the taste substances and nutrients in the raw materials can be well preserved, and high-quality garlic powder and ginger powder can be produced.
Third, it is used for the production of health products: including royal jelly freeze-dried powder, pure snake powder, turtle meal, Cordyceps sinensis, pilose antler, ginseng, spirulina powder and so on.
Analysis of the advantages of Weibo drying equipment
Microwave drying equipment is the core of the microwave generator, the current frequency of microwave drying is mainly 2450 MHz, mostly used in chemical, food, agricultural and sideline products, timber, building materials, paper and other industries drying, can also be used for food, agricultural and sideline products, etc. Sterilization. In the conventional drying process, in order to increase the drying speed, it is necessary to increase the external temperature and increase the gradient of the temperature difference. However, the phenomenon of endogenous coke formation outside the material is easily generated. However, when microwave heating is used, no matter how the material is shaped, heat can be uniformly infiltrated, and a bulky effect can be produced, which facilitates crushing.
Under microwave irradiation, the drying rate of the materials tends to be uniform and the heating is even. In addition, the microwave drying technology does not affect the color, aroma, taste and tissue structure of the dried material, and the active ingredient is not easily decomposed and destroyed. Relevant research institutions are proceeding to use microwave drying instead of traditional drying room drying to solve the problems of dry uneven drying and the like when drying traditional Chinese medicine using traditional drying methods.
Microwave equipment has fewer supporting facilities, occupies less land, is easy to operate, and can be continuously operated. It is convenient for automated production and enterprise management (it can be controlled through PLC programming and temperature can be adjusted). The energy efficiency of the microwave drying process is relatively high. This is because the heat of the microwave is generated directly inside the wet material, the heat loss is small, the thermal efficiency is high without environmental and noise pollution, and the working environment can be greatly improved.
In the next few years, the domestic microwave dryer industry will continue to develop and become an important driving force for the development of the domestic microwave dryer industry. Therefore, the production enterprises must not only carry out fundamental transformations from the drying process, but also carry out comprehensive and multi-level energy-saving technological transformations, and vigorously develop drying technologies that use renewable energy and industrial waste heat.
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