In modern enterprises, the use of compressed air is more and more common. The common compressed air dryers are mainly adsorption dryers and refrigeration dryers. What is the difference between a freeze dryer and an adsorption dryer?

1. Different working principles

According to the principle of refrigeration and dehumidification, the dryer cools the saturated compressed air from the upstream to a certain dew point temperature through heat exchange with the refrigerant, condenses out a large amount of liquid water, which is automatically discharged out of the dryer after being separated by the gas-liquid separator, so as to achieve the purpose of water removal and drying. According to the principle of pressure swing adsorption, the dryer absorbs most of the water in the desiccant by contacting the saturated compressed air from the upstream with the desiccant under a certain pressure, and the dry air enters the downstream to work, so as to achieve deep drying.

2. Different dewatering effects

Due to the restriction of its principle, if the temperature is too low, the cold dryer will freeze, so its dew point temperature is usually 2~10 ℃. Because the dryer does not need to change the temperature, and the desiccant (aluminum oxide) can be deeply dried, the dew point temperature at its outlet can generally reach below - 20 ℃, that is, it can achieve deep drying.

3. Difference in energy loss

For the dryer, the cooling purpose can be achieved only by compressing the refrigerant, so the power supply will be higher. As long as the electric cabinet is used to control the valve, the electric power of the dryer is only about tens of watts, which means that there will be no power loss.

4. Difference of gas loss

Because the cold dryer removes water by changing temperature, and the water is discharged from the machine through the automatic drainer, there is no air loss. The dryer needs regeneration after water absorption saturation, so it needs about 12-15% regeneration gas loss.

5. Difference of failure rate

Because the refrigerant system and air system of the dryer, including the electrical part, are relatively complex, while the dryer only has the possibility of failure due to frequent valve action, so the failure rate of the dryer is usually lower than that of the dryer.

In general, the suction dryer is superior to the cold dryer in both stability and effect, just because it will consume a certain amount of regeneration gas, so we generally want customers to make a choice after weighing the advantages and disadvantages. However, now more and more manufacturers have chosen suction dryers. It should be said that this is gradually becoming a trend.

The amount of water vapor in the compressed air is determined by the temperature of the compressed air: under the condition that the pressure of the compressed air is basically unchanged, reducing the temperature of the compressed air can reduce the content of water vapor in the compressed air, and the excess water vapor will condense into liquid.

● R22 refrigerant and tube heat exchanger are used for more than 80 cubic meters; the gas-liquid separator adopts a patented three-stage separation method of "direct collision separation , low-speed centrifugal separation and stainless steel wire mesh demisting separation", which will remove 99.9% of the liquid The moisture is separated from the cooled compressed air to prevent the secondary evaporation of moisture and ensure the low dew point quality of the finished gas;

After treatment equipment of air compressor mainly includes air receiver, dryer and filter. The dry compressed air can ensure the smooth operation of the air compressor air system and the production process. The role of the dryer is to eliminate the condensed water in the compressed air and ensure the discharge of dry and clean compressed air. After the relevant dryer is equipped, the compressed air still contains water because of these reasons.

1. The air humidity around the air compressor station is high. The air itself has humidity and contains a certain amount of water. When the air is compressed, due to the high internal temperature of the compressor, the water directly evaporates to form steam, and then discharges the compressor with the pressure. When the compressor is shut down, the temperature drops, which will cause the water vapor to form condensate. Therefore, the working environment humidity of the air compressor should be low; Or drain the condensate before starting the machine.

2. The post-treatment drying equipment fails. The general post-treatment capacity of the cold dryer is the pressure dew point of 3 ℃. If the temperature of your work site is lower than 3 ℃, there must be water. At this time, it is recommended to configure the post-treatment drying equipment of the micro heat dryer, and the pressure dew point can reach - 20 ℃ without producing water.

3. The capacity of the post-treatment drying equipment configured for the air compressor is insufficient. Generally speaking, the post-treatment capacity configured for users by the manufacturer is based on the average air consumption. If your instantaneous air consumption is large, the capacity of the post-treatment drying equipment will be insufficient, causing water in the gas.

4. The air tank itself has the function of ponding, and it contains a large amount of water that has not been drained, so the drainage is forgotten. Open the drain valve under the air tank regularly to drain the water.

Air dryer for compressor refrigerated (plate fin type)

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