Basic requirements and classification of drying equipment

Basic requirements for drying equipment: In the production of chemical industry, food and medicine, the shape (such as block, granular, powder, solution, slurry, paste, etc.) and properties (heat resistance, dispersibility, viscosity, explosiveness, hygroscopicity, etc.) of the dried materials are different, and the requirements for the dried materials (water content, appearance, strength, particle size, hygiene requirements, etc.) are also different, and the production scale or production There is a big difference in ability Therefore, the drying methods used are different, and the types of drying equipment are various Generally, the dryer has the following requirements: (1) it can ensure the technological requirements of the product, such as achieving the specified drying degree, uniform drying quality, and ensuring the shape of the product, etc (2) fast drying rate, so as to improve the production capacity of the equipment, shorten the drying time and achieve "small equipment, large production" (3) the thermal efficiency of the drying system is high, so as to reduce the energy consumption of the drying operation (4) the fluid resistance of drying system should be small to reduce the energy consumption of conveying machinery (5) convenient operation and control, good working conditions, simple auxiliary equipment, etc Classification of drying equipment: there are many types of dryers used in industry, which can be classified according to different methods: (1) according to the operating pressure of dryers, they can be divided into atmospheric and vacuum dryers (2) according to the operation mode of dryer, it can be divided into intermittent dryer and continuous dryer (3) according to the heating mode, it can be divided into convection dryer, conduction dryer, radiation dryer and dielectric heater.