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The Working Principle Of The Desiccant
Jan 15, 2018

Such as wood in the production of wood mold, wood before drying can prevent the deformation of products, ceramic billet before calcination drying can prevent the finished product cracking. In addition, dry materials are also easy to transport and storage, such as the harvest of grain drying to a certain moisture content below to prevent mildew. Because natural drying can not meet the needs of production development, various mechanized dryers are widely used.


The amount of water vapor in the compressed air is determined by the temperature of the compressed air: in the case of keeping the compressed air pressure basically unchanged, reducing the temperature of compressed air can reduce the water vapor content in the compressed air, and the excess water vapor will condense into a liquid. Freeze dryer is the use of this principle to use refrigeration technology to dry compressed air. Therefore, the cold dryer has a refrigeration system. Refrigerated dryer refrigeration system is compressed refrigeration, by refrigeration compressor, condenser, evaporator, expansion valve and other four basic components. They are connected in sequence to form a closed system in which refrigerant circulates continuously in the system, changing state and exchanging heat with compressed air and cooling medium. The compressed air dryer also has the adsorption type dryer and the dissolved type dryer.


The refrigeration compressor sucks the low pressure (low temperature) refrigerant in the evaporator into the compressor cylinder, refrigerant steam is compressed, pressure, temperature rise at the same time, high-pressure high-temperature refrigerant vapor is pressed to the condenser, in the condenser, the temperature of the refrigerant vapor with a lower temperature than the cooling water or air for heat exchange, The heat of the refrigerant is condensed by water or air, and the refrigerant vapor becomes liquid. This part of the liquid is then transported to the expansion valve, through the expansion valve throttling into a low temperature and low pressure liquid and into the evaporator, low temperature in the evaporator, low pressure refrigerant liquid absorption of compressed air heat and vaporization (commonly known as "evaporation"), and compressed air to be cooled after the condensation of a large number 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 refrigeration system of refrigerating dryer, the evaporator is the equipment of conveying cold quantity, in which the refrigerant absorbs the heat of compressed air and realizes the purpose of dehydration and drying. The compressor is the heart, which plays the role of inhaling, compressing and transporting the refrigerant steam. A condenser is a device that emits heat and transmits the heat absorbed in the evaporator along with the input power of the compressor into the cooling medium (e.g. water or air). Expansion valve/throttle valve on the refrigerant from the throttle effect, while controlling and regulating the flow of refrigerant liquid into the evaporator quantity, and the system is divided into high-pressure side and low pressure side of the two parts.