Drying is an indispensable process in many industrial processes and agricultural and sideline products processing. With the improvement of people's quality of life, the awareness of environmental protection is becoming stronger and the reserves of non-renewable energy sources (such as natural gas, coal, and oil) are depleted. The use of high-energy, high-pollution drying equipment such as fuel and coal is strictly limited or even prohibited. It is increasingly urgent to find a kind of drying equipment that can replace the old ones, and it is safe, environmentally friendly, energy-saving and drying equipment. Heat pump drying equipment has emerged in this environment. History of heat pump drying technology Since the 1970s, the United States, Japan, France, Germany and other countries have carried out research on heat pump drying technology. The International Energy Center (IEA) has concentrated a large number of research results on heat pump drying technology. China also introduced this technology in the 1980s. Zui is early and the application range is widely used for the drying of wood. Since the drying temperature of the heat pump is close to natural drying, it has been gradually applied to the drying of food and agricultural by-products in recent years. Among them, good economic benefits have been achieved and the added value of products has been greatly improved. In particular, the implementation of the energy conservation and environmental protection policies of the Chinese government has greatly promoted the development of heat pump drying technology. Materials treated with heat pump drying equipment also extend from early wood drying to food processing, tea drying, tobacco drying, vegetable dehydration, fish drying, ceramic baking, sterilization and drying of pharmaceuticals and biological products, sludge treatment, Chemical raw materials and fertilizer drying and many other fields. The principle of the heat pump dryer The heat pump dryer uses the inverse Carnot principle to absorb the heat of the air and transfer it to the room, to improve the temperature of the drying room, and to cope with the corresponding equipment to achieve material drying. The heat pump dryer consists of a compressor-heat exchanger (internal unit)-throttle-heat absorber (outer unit)-compressor and other devices to form a circulation system. The refrigerant circulates in the system under the action of the compressor. It completes the gaseous boosting process in the compressor (temperature up to 100 °C), it enters the internal machine to release high-temperature heat to heat the air in the drying room, while being cooled and converted into a liquid liquid, when it runs to the outside machine After that, the liquid rapidly absorbs the heat and evaporates again into a gaseous state, and the temperature drops to minus 20 ° C - 30 ° C, at which time the air around the heat sink will continuously transfer heat to the refrigerant. The continuous circulation of the refrigerant realizes the transfer of the heat in the air to the temperature of the air in the heating room in the drying room.
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