Microwave-hot air combined fluidized bed drying experiment device

Abstract

A microwave-hot air combined fluidized bed drying experiment device is characterized by comprising a tower type fluidized bed, a microwave drying device disposed on the lateral wall of the tower type fluidized bed and a hot air drying system connected to the bottom of the tower type fluidized bed. The microwave drying device comprises a microwave generator and a microwave controller. The hot air drying system comprises a hot air heater, a temperature controller, a steam generator, a humidity detector and a compressed air source. By the microwave-hot air combined fluidized bed drying experiment device which is high in automation level, small in floor space and simple and safe to operate, fast temperature rise of materials can be achieved in a short time, even heating is achieved, and evenness of microwave energy absorption is increased; during drying, microwaves can stimulate polar molecules to change orientations constantly to generate a non-thermal effect by high-speed molecule vibration so as to accelerate drying, materials (such as tobacco) with the effective components mostly being glycoside, terpene lactone and volatile oil can be well protected, and quality of dried materials is guaranteed.

Description

technical field [0001] The invention belongs to a microwave intermittent drying device, which can uniformly and quickly dry materials through microwave radiation in a fluidized state, and is specifically a microwave fluidization suitable for particles, sheet bases or strip materials (such as tobacco) in porous media. Bed hot air combined drying experimental device. Background technique [0002] As a basic chemical unit operation, drying is an essential operation in chemical, food, agricultural, pharmaceutical and mining industries. However, due to the large amount of latent heat of evaporation and the low efficiency of the drying medium in the drying process, the drying process consumes a lot of energy. As a new drying method, microwave drying is more competitive in the drying field due to its fast and efficient characteristics. [0003] At present, microwave drying technology is developing rapidly, and microwave drying devices have been widely used in production. However,...

AI Technical Summary

Problems solved by technology

Compared with traditional hot air drying, microwave drying can make up for the shortcomings of longer drying time, low dehydration rate and energy utilization rate, and difficult to guarantee product quality in the hot air drying process.

However, during the hot air drying process, the internal temperature of the product is low and stable, while the electromagnetic field distribution in the microwave drying room is uneven, resulting in high local temperature and large fluctuations, which also have an important impact on the quality uniformity of the dried product.

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