Shanghai Bilang Instrument Manufacturing Co., Ltd. is a high-tech company dedicated to the field of freeze-drying. The main product of our company is advanced and reasonable product design; stable and reliable quality; timely and perfect after-sales service.
The following is a case analysis of BILON's summary of how to reasonably use the freeze dryer and failure!
1. What is the reason for the high condensing pressure?
When the dryer is working, the condensing pressure of R-22 should be no more than 18bar. In practice, it is seen when the condensing pressure exceeds the situation. The problems that cause the condensing pressure to rise mainly include the following points: wind condenser condensing pressure The reasons are too high; the ambient temperature is too high or poor ventilation; the surface area of ​​the condenser has dust and dirt; the load of the dryer is too large; the air intrudes into the refrigerant system; the heat transfer area of ​​the condenser is not enough; the cooling fan air volume is small; the installation position of the dryer Incorrect (such as close to the heat source, direct sunlight, the distance between the front and back of the dryer is too close, etc.); the pressure switch of the control fan is improperly set or damaged; the refrigerant path or component is blocked; the refrigerant is filled too much, which causes heat transfer The area is reduced.
The reasons for the excessively high condensing pressure of the water condenser are: insufficient cooling water and excessively high water temperature; small heat transfer area of ​​the condenser; air intrusion into the refrigerant system (broken copper pipe); small volume of the condenser shell, and effective storage of refrigerant liquid for heat transfer The area is reduced or the refrigerant charge is excessive, the water condenser is used for a long time, the surface area of ​​the copper pipe water side is scaled; the opening of the automatic water volume adjustment valve is small or damaged; the refrigeration oil enters the refrigeration system; the cooling water pipe is unreasonable, causing the cooling water to return water Not smooth; refrigerant passages or components (dry filter, capillary, etc.) are clogged; the load of the cold dryer is too large, which increases the evaporation pressure and raises the condensation pressure.
2. What is the reason for the low condensing pressure?
The reasons for the low condensing pressure of the condenser are too much cooling water or the water temperature is too low; the ambient temperature is too low; the pressure switch that controls the fan or the automatic water regulating valve that controls the cooling water is improperly set or damaged; the refrigerant charge is too small; The refrigerant pipeline or component has a leak; the load of the dryer is too small. Generally, a slightly lower condensing pressure has no great effect on the operation of the dryer and refrigeration system, but too low a condensing pressure sometimes causes the evaporation pressure to drop, causing frost or even liquid compression in the evaporator, which needs to be prevented.
3. How does the amount of refrigerant injection affect the dryer?
If there is too little refrigerant injection, the following phenomena may occur during cold drying: the evaporating pressure and the condensing pressure are lower than normal operation, but the air dew point cannot be reduced; the compressor casing is hot. If there is too much refrigerant injection, there will be opportunities for cold-drying: due to the accumulation of refrigerant liquid in the condenser, the area of ​​the condenser is reduced, resulting in an increase in the condensing pressure, which will cause high-pressure tripping in severe cases; the increase in the load of the refrigeration compressor makes it difficult to start; In the evaporator, it cannot be completely vaporized, so that the wet vapor enters the compressor. There is a danger of "liquid compression"; due to the increase in condensing pressure, the compressor cooling capacity is reduced and the air dew point is increased.
4. Is the water in the exhaust of the cold dryer necessarily caused by insufficient dew point?
The dryness of compressed air refers to the amount of mixed water vapor content of the compressed air. If the water vapor content is small, the air is dry, otherwise it is wet. The dryness of compressed air is measured by the "pressure dew point". If the "pressure dew point" is low, the compressed air is dry. Sometimes the compressed air discharged from the cold dryer is mixed with a small amount of liquid water droplets, but this is not necessarily caused by insufficient dew point of the compressed air. The existence of liquid water droplets in the exhaust may be caused by water accumulation in the machine, poor drainage or incomplete separation, especially the fault caused by the clogging of the automatic drain has the greatest impact. The water in the exhaust of the cold and dry machine is not enough to cause a worse adverse effect on the downstream gas equipment than the dew point. The cause should be found and eliminated.
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