Troubleshooting of frequent jumping of refrigerated air dryer in high temperature environment

The most common failure of a refrigerated air dryer is to jump in a high temperature environment. The following is the analysis of this problem.

A. Improper cleaning

Scenario: the wind condenser is in the forced convection area caused by the fan for a long time, resulting in a large amount of willow wool, dust as insulation cotton clinging to the cooling fins, the formation of dirt heat resistance, so that the copper tube heat transfer is hindered.

The enthalpy difference experiment found that when the average thickness of the fin heat exchange area ash reaches 4 mm, the attenuation rate of fin heat dissipation is as high as 23.9%.

The situation continues to be bad, the refrigerant will not be able to fully liquefy due to the lack of cooling, and the condensing pressure keeps climbing.

Finally, the high pressure gauge pressure value exceeds 23 kg and the refrigerated air dryer jumps.

Solution:

1. usually use "water flushing method"

The disadvantage of this method is obvious, when the water pressure is too high during cleaning or improper operation, it will cause the fins to be inverted and deformed, which will affect the heat transfer efficiency of the condenser when it is used again.

In addition, this method is extremely wasteful of labor and water resources in the case of a large number of devices.

2. The "wind reversal method" can also be used

If there are professionals on site, you can try to reverse the operation of the fan through circuit modification, so that the negative pressure zone in the previous positive rotation is changed to positive pressure, and the positive pressure of airflow is used to remove the dust attached to the fin gap and surface.

Second, the ambient temperature is too high

1. Non-explosion-proof refrigerated air dryers are mostly placed in the air pressure station

Here there will be a variety of external factors lead to jump machine

The ventilation of the air pressure station is too poor

Solution: Set up separate air ducts, which need to be designed by air compressor selectors according to the user's use environment and the user's requirements. The hot air exchanged by heat will be exported to the air pressure room through the air duct, and even a fan or fan should be set at the outlet to strengthen the export effect.

A large number of equipment in the station work at the same time

Solution: Using water mist to cool the condenser, this method has certain safety risks. The condenser fins are aluminum, the pipes are copper, the pH value of tap water is basically neutral, and there is about 2.5×104mol/L oxygen dissolved in the water, which will cause oxygen-consuming corrosion to the metal. A better method is to choose to install additional axial fans or ordinary fans to increase forced convection.

Air compressor and refrigerated air dryer placed in the same space

Solution: Lengthen the pipeline connecting the air compressor and the cooler, and transfer the cooler to another room. If there is no condition, you can use porous material, vacuum insulation material or heat-reflective material to make heat insulation board for the compressor and the cooler.

2. Explosion-proof air dryers are usually placed outdoors

In summer, the most common cause of high pressure jumping is direct sunlight.

The solution: make a sunshade, which is economical and practical and can greatly reduce the chance of jumping!

Third, the selection is small

In the purchase of refrigerated air dryer, the buyer and seller failed to communicate rigorously on the specific parameters of the refrigerated air dryer, resulting in the selection of refrigerated air dryer model is small, if the flow of the user exceeds the rated flow of the refrigerated air dryer, will prompt the evaporation temperature is too high, the pressure is rising until the high pressure protection.

Solution: In the early communication, the buyer should confirm whether the parameters they provide are accurate, and the refrigerated air dryer manufacturer should also repeatedly review the technical program.

Lingyu Machinery ~ 2~10C dew point refrigerated compressed air dryer