Water-cooled Low Dew Point Combined Desiccant Air Dryer

The water-cooled low dew point combined desiccant air dryer is composed of a refrigerated compressed air dryer and an adsorption (non heated or heated) compressed air dryer through reasonable pipeline connection and volume matching. The refrigerated compressed air dryer has very strong water removal capacity, low operation energy consumption and no air loss. Combined with the adsorption compressed air dryer, which can achieve low dew point, it can give full play to the advantages of both.

● Low dew point: the combined low dew point dryer can reach a very low pressure dew point, which can reach below -40 ℃ in general and -70 ℃ at least according to different user requirements;

● It can provide compressed air with different dew points for different gas consumption points;

● All operating switches of the combined low dew point compressed air dryer and some display instruments of the cold dryer are centralized on the panel of the box plate. The refrigerated compressed air dryer and the adsorption regenerative compressed air dryer can operate independently or simultaneously cold and suction according to the needs of customers;

● The gas-liquid separator adopts the self-designed three-stage separation method: direct impact separation + low-speed centrifugal separation + stainless steel wire mesh demisting separation. 99.9% of the liquid water is separated from the cooled compressed air to prevent the secondary evaporation of water and ensure the low dew point quality of the product gas;

● The high-quality switching valve is stable and reliable, which can ensure the integrity of the workflow and prolong the working life of components;

● The fully or semi enclosed refrigeration compressors of Danfoss (Denmark), Fusheng (Taiwan), Panasonic (Japan), Bitzer (Germany), Copeland (Germany) and MANEUROP(France) are used as the refrigeration compressors, with stable operation, low noise, high cop, reliable performance and long power saving life;

Applicable working conditions

Design working conditions

Water-cooled low dew point combined desiccant air dryer

How to select refrigeration dryer, adsorption dryer and combined dryer

1. Refrigerated dryer:

The freezing dryer applies the physical principle to freeze the moisture in the compressed air below the dew point, so that it can be separated from the air. It is simply understood as cooling water. However, due to the freezing point temperature of water, theoretically, the dew point temperature of the refrigerated dryer can be close to 0 ℃, but not reach 0 ℃.

After the compressed air flows into the evaporator, it exchanges heat with the refrigerant through the heat exchange function of the evaporator. The heat in the compressed air is taken away by the refrigerant, and the compressed air cools rapidly. The moisture in the moist air reaches the saturation temperature and condenses rapidly. The condensed moisture forms water droplets after condensation. After separation, the water is discharged from the automatic drain valve.

The dew point of the air pressure treated by the refrigeration dryer can be as low as 2 degrees. The air with this dew point can basically meet the requirements of general equipment for gas moisture content. If the gas with a lower dew point is required, an adsorption dryer is required.

2. Adsorption dryer:

The principle of the adsorption dryer is that the saturated compressed air uses the difference between water and air molecular volume to filter the saturated water vapor in the compressed air by using the special molecular sieve for gas purification, which can easily adsorb the water molecules in the molecular sieve particles, and then use the regeneration method to restore the molecular sieve to restore its water absorption capacity. In short, the drying effect is achieved through the principle of pressure swing adsorption.

We generally divide adsorption dryers into heatless regeneration adsorption dryers and slightly heated regeneration adsorption dryers. The dew point of heatless regeneration is higher than that of slightly heated regeneration, the dew point of heatless regeneration is about - 20 ℃, and the minimum temperature of slightly heated regeneration is - 40 ℃. Most of the equipment gas can meet the requirements. For the instrument gas with high requirements, it is time to consider the combined dryer

3. Combined dryer:

The combined dryer can be simply regarded as the combination of the freezing dryer and the adsorption dryer, but it is not a simple series connection, but a combination of the advantages of the two, giving full play to the advantages of the freezing dryer and the adsorption dryer. The dew point of the combined dryer can reach below - 60 ℃, which is the first choice for precision equipment instrument gas.

Their advantages and disadvantages are also obvious:

Refrigerated dryer: the price is relatively cheap, and the cost of daily maintenance is low, but the dew point of the treated gas is high, which is not suitable for precision equipment.

Adsorption dryer: the price is moderate, the adsorbent in the adsorption barrel needs to be replaced regularly, and the dew point of the treated gas is generally above - 40 ℃. It is suitable for gas demand of most equipment.

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