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The evaporator is one of the main components in the dryer. The two systems of the dryer - the air flow system and the refrigeration system meet in the evaporator, so the evaporator conditions can reflect the processing effect of the compressed air, and also reflect the working condition of the refrigeration system. We always hope that the higher the exhaust temperature of the dryer, the better (exhaust temperature is high, indicating more energy recovery), there is no temperature difference between the import and export of Zui. The evaporator is divided into two categories: cyclic type and membrane type. It is mainly composed of a heating chamber and an evaporation chamber. The heating chamber supplies the liquid with the heat required for evaporation, causing the liquid to boil and vaporize; the evaporation chamber completely separates the gas-liquid two phases. The vapor generated in the heating chamber is filled with a large amount of liquid foam, and after reaching the evaporation chamber of a large space, the liquid is separated from the vapor by the action of self-aggregation or demister. Usually the demister is placed on top of the evaporation chamber. However, in fact, this is not the case. When the air inlet temperature is below 45 °C, it is not uncommon for the temperature of the cold dryer to differ by more than 15 °C.
Introduction of the role of precooler and evaporator in cold dryer
What is the role of the pre-cooler in the dryer: in fact, it is an air heat exchanger. In order to make the condensate easy to discharge, it is usually arranged that the saturated compressed air having a higher temperature is taken away from the shell, and the dry air having a lower temperature is taken away. The main function of the pre-cooler in the dryer is to "recover" the amount of cold carried by the compressed air after being cooled by the evaporator, and use this part of the cooling to cool the higher temperature compressed air carrying a large amount of water vapor (ie from the air The press is discharged, and the temperature is cooled by the rear cooler, and the temperature of the gas-water separation is generally above 40 ° C (saturated compressed air), thereby reducing the heat load of the refrigeration system of the freeze dryer and achieving energy conservation. Generally speaking, the temperature of the exhaust gas of the cold dryer reflects the degree of reuse of the cold generated by the precooler, and the exhaust gas temperature is high and the utilization rate of the cold is high. However, due to the limitation of heat exchange conditions, especially due to the fact that the dew point in the machine cannot be lower than the freezing point condition, the increase in the exhaust temperature of the dryer is limited.