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How does the dryer work?
Jun 01, 2018

For example, the drying of wood before the making of wood molds and woodware can prevent the deformation of products, and the drying of ceramic blank before calcination can prevent the cracking of finished products. In addition, the dry materials are also convenient for transportation and storage, such as drying the harvested food to a certain moisture content, to prevent mildew. As natural drying is far from meeting the needs of production development, various mechanized drying machines are more and more widely used.

The amount of water vapor in the compressed air is determined by the temperature of the compressed air: in keeping the compressed air pressure is almost the same, the lower the temperature of the compressed air compressed air can be reduced by the water vapor content, and the excess of water vapor condenses into liquid. This principle is used to dry compressed air by refrigeration technology. Therefore, there is a cooling system for the cold dryer. The refrigeration system of refrigerating dryer belongs to compressive refrigeration, which consists of four basic components, including refrigeration compressor, condenser, evaporator and expansion valve. Between them in turn connect pipe to form a closed system, the refrigerant in the system constantly circulating, change state and heat exchange with compressed air and cooling medium. Compressed-air dryer and adsorption dryer and solvent dryer.

The refrigerant compressor sucks the low pressure (low temperature) refrigerant in the evaporator into the compressor cylinder. Refrigerant of high temperature high pressure steam pressure to the condenser, the condenser, higher temperature of the refrigerant vapor heat exchange with a relatively low temperature of the cooling water or air, the quantity of heat of refrigerant was taken away by water or air cooling down, refrigerant vapor into liquid. This part of liquid is then transported to the expansion valve, which is throttled by the expansion valve into a low-temperature and low-pressure liquid and enters the evaporator. In the evaporator, the cold and low pressure refrigerant liquid absorbs the heat of compressed air and vaporizes (commonly known as "evaporation"). After the compressed air is cooled, a large amount of liquid water is condensed out. The refrigerant vapor in the evaporator is sucked away by the compressor, so that the refrigerant is compressed, condensed, throttled and evaporated in the system, thus completing a cycle.

In the refrigeration system of the refrigerating dryer, the evaporator is a device for conveying cooling amount, in which the refrigerant absorbs the heat of compressed air and realizes the purpose of dehydration and drying. Compressor is the heart, which ACTS as the inhalation, compression, and transport of refrigerant vapor. A condenser is a device that releases heat, passing heat from the evaporator to the cooling medium (such as water or air) along with heat from the compressor's input power. The expansion valve/throttle valve ACTS as a throttling and depressurizing effect on the refrigerant, controls and regulates the amount of refrigerant liquid flowing into the evaporator, and divides the system into two parts: high pressure side and low pressure side.

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