Industrial Air cooled Air Dryer

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Technical Data for Air Cooling Refrigerated Air Dryer

Fundamental

Compressed air can achieve the purpose of removing water vapor through pressurization, cooling, adsorption and other methods. The refrigeration dryer is a cooling method.

We know that the air compressed by an air compressor contains various gases and water vapor, so it is all humid air. The moisture content of humid air is inversely proportional to the pressure as a whole, that is, the higher the pressure, the lower the moisture content. After the air pressure is increased, the water vapor in the air exceeding the possible content will condense into water (that is, the volume of the compressed air becomes smaller and cannot contain the original water vapor).

Compared with the original inhaled air, the moisture content becomes smaller (here refers to this part of the compressed air returning to the uncompressed state in comparison).

But the exhaust of an air compressor is still compressed air, and its water vapor content is at the maximum possible value, that is, in a critical state of gaseous and liquid state. The compressed air at this time is called a saturated state, so as long as it is slightly pressurized, water vapor will change from a gaseous state to a liquid state, that is, condensate water.

PS. Help to understand: Suppose the air is a wet sponge that has absorbed water, and its moisture content is the absorbed water. If you forcefully squeeze some water out of the sponge, the moisture content of the sponge will be relatively reduced. If you let the sponge recover, it will naturally be drier than the original sponge. This also achieves the purpose of removing water and drying through pressure.

If in the process of squeezing the sponge with continuous water flowing out, the force is no longer applied after reaching a certain strength, the water will stop being squeezed out, which is the saturated state. Continue to increase the squeeze, and there is still water flowing out.

Therefore, the air compressor itself has the function of removing water, and the method used is to pressurize. However, this is not the purpose of the air compressor, but a "hateful" burden.

Why not use "pressurization" as a means of removing water from compressed air? This is mainly because of economy, increasing the pressure by 1 kg. It is quite uneconomical to consume about 7% of energy consumption.

The "cooling" dewatering is relatively economical. The refrigerated dryer uses a similar principle as the dehumidification of air conditioners to achieve its purpose. Because the density of saturated water vapor has a limit, in aerodynamic pressure (within the range of 2MPa), it can be considered that the density of water vapor in saturated air depends only on the temperature, and has nothing to do with the air pressure.

The higher the temperature, the greater the density of water vapor in the saturated air, and the more water. On the contrary, the lower the temperature, the less water (this can be understood from common sense in life, dry and cold in winter, and hot and humid in summer).

The compressed air is cooled to the lowest possible temperature, so that the density of the water vapor in it becomes smaller, forming "condensation". The small water droplets formed by the condensation are collected and discharged to achieve the purpose of removing the moisture in the compressed air. .

Because it involves the process of condensation and condensation into water, the temperature must not be lower than the "freezing point", otherwise the water will not be effectively drained due to freezing. Usually the nominal "pressure dew point temperature" of refrigerated dryers is mostly 2~10℃.

For example, the "pressure dew point" of 10°C of 0.7MPa is converted into the "normal pressure dew point" as -16°C. It can be understood that no liquid water will appear when compressed air is exhausted to the atmosphere when it is used in an environment not lower than -16°C.

All the water removal methods of compressed air are relatively dry and meet a certain requirement of dryness. Absolute removal of moisture is impossible, and it is very uneconomical to pursue dryness beyond the use requirements.

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