Freeze-drying is a method of first freezing water-containing substances into a solid state, and then sublimating the moisture from the solid state into a gaseous state to remove the moisture and preserve the substances. In the compressed air drying process, the freeze-drying is to reduce the temperature of the compressed air to precipitate the moisture in the compressed air. The working principle of the freeze dryer (cold dryer) is the same as that of the refrigerator. After the compressed air passes through the frozen compressed air pipe, the temperature of the compressed air drops to the required temperature to meet the requirements of drying.
The main purpose of the freeze dryer is to remove the moisture in the compressed air. The freeze dryer can remove more than 90% of the saturated water vapor. If there is still a lot of moisture in the rear pipeline of the freeze dryer, then the freeze dryer needs to be Check that the abnormal working conditions of the various types of freeze dryers mentioned above will cause abnormalities in the refrigeration system, which will lead to a decline in the cooling effect, of course, it will affect the water removal effect. In summary, the reasons for the poor water removal effect of the freeze dryer are mainly in the following aspects: the automatic drain valve does not automatically drain, There are many reasons that the automatic drain valve does not drain, it may be that the inlet filter is blocked, the float is broken Not open, the water rod is stuck, the use pressure is too high, the electromagnetic coil is burnt, etc.,
Second, the evaporation temperature of the dryer is too high;
1. The inlet temperature of the dryer is too high (exceeds the maximum inlet temperature marked by the machine);
2. The ambient temperature of the equipment room is too high, and the radiator condenser is blocked without cleaning;
3. The hot gas bypass valve is adjusted too large;
4. The air compressor runs continuously but the pressure is low and the gas consumption on site is too large.
3. The evaporation temperature of the dryer is too low:
1. Refrigerant leakage of refrigeration system;
2. The drying filter is clogged;
3. The expansion valve is blocked or damaged;
4. The antifreeze switch is damaged and the fan runs continuously.
Fourth, the air compressor horsepower does not match the dryer.
Fifth, the bypass valve in the air line of the dryer is not closed tightly.
Sixth, the startup sequence is wrong, you should first turn on the dryer for 5 minutes and then turn on the air compressor.
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