Regenerative Desiccant Compressed Air Dryer

● 2-8 hours standard cycle;

● Working pressure dew point -20℃~-40℃；

● High-quality switching valve, stable and reliable, can ensure the integrity of the work process and prolong the working life of components;

● Choosing Special adsorbents with highly hygroscopic , uniform shape and size, high strength, low output dew point, less dust generated, and long service life;

● The unique design of regeneration pipeline ensures that the regeneration air can be distributed evenly during flat heating and cold blowing, so that the adsorbent in the center of the adsorption tower can be heated evenly, heat dissipation is fast, and regeneration is complete;

● Reasonable heater design, good dehumidification and regeneration effect, low air consumption, high heating efficiency, and minimized energy consumption;

● Programmable microcomputer controller, that cycle time—adsorption, regeneration working time, heating time, heating temperature can be adjusted to achieve your satisfactory dew point value;

Table 1: Working pressure correction factor CFP

Table 2: Air inlet temperature correction factor CFT

● The pressure loss of the pre-filter in the system must be considered when choosing the correction factor CFP of inlet pressure of dryer.

● Select the air inlet temperature correction factor CFT.

● Selection calculation formula: selection treatment capacity = actual treatment capacity÷(CFPXCFT)

What is the difference between a freeze dryer and an adsorption dryer?

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 According to the principle of refrigeration and dehumidification, different freezers cool the saturated compressed air from the upstream to a certain dew point temperature through heat exchange with the refrigerant, condense a large amount of liquid water, which is automatically discharged out of the machine 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. Due to the difference in water removal effect, the cold dryer is restricted by its principle. If the temperature is too low, it 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. The energy loss is different. For the refrigerator 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.

The air loss is different because the cooling dryer removes water by changing temperature, and the water is discharged from the dryer through an automatic drainer, so there is no air loss. The dryer needs regeneration after water absorption saturation, so it needs about 12-15% regeneration gas loss. 5 The failure rate is different because the refrigerant system and air system of the dryer, including the electrical part, are relatively complex, while the dryer has the possibility of failure only because of the frequent action of the valve, so the failure rate of the dryer is usually lower than that of the supercooled 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.

1. Process Flow Diagram of Heated Regeneration Air dryers

2. Working Principle of Heated Regeneration Air dryers

With taking advantage of the surface absorbability of porous solid material, the heated regeneration air dryer is a kind of equipment, which can absorb the moisture to get satisfied air with lower dew point, air dryer and better cleanliness.

It adopts active alumina, whose diameter is almost same with water molecule, as the adsorbent, it’s also in line with the world advanced pressure swing adsorption (PSA) principle, that is to say, when absorbing in normal temperature, the pressure of water molecule in air is big than that in desiccant, so the former will be sucked into the desiccant, then condense to water drop, meanwhile the liberated heat will be stored at the upside of the tower. As regenerating, in order to temporary lower the desiccant absorption ability to let the water molecule effuse out, about 7% dry air will go through the regeneration tower slowly after the air being heated up to 150℃, the stored heat also will take part in regeneration process for energy saving. For the circular employ of absorption-regeneration-absorption, the desiccant dries compressed air continuously to get deeply dried air. The technical performance already has reached the international high-level standard. It can be you ideal equipment with dew point lowering than -40℃.

The working alternating cycle of twin tower can ensure stable output of satisfied compressed air. Its pressure dew point which can make up to -40℃ is definitely can obtain deeply dry and oil-free compressed air with high purity to meet the customer high requirements. Due to the heater, it can keep good regeneration performance with less purge air loss.

3. Configuration Process of Micro-Heated Regeneration Air Dryer

4. Main Component Illustration on the Micro-heated Regeneration Air Dryer

5. Technical Parameters

6. Technical Requirements

1) Matching Application of Micro-Heated Regeneration Air Dryer

2) During absorption process, desiccant is sensitive with the quality of inlet air: the oil content of the inlet air should be lower than 0.1PPM, otherwise, it will give an influence on the absorption performance, what’s worse, it will reduce desiccant’s lifespan and make an irretrievable damage.

3) In order to meet production need without any impact on continuous manufacturing, such as dryer maintenance and repairing, we suggest customers select by-pass system to equip at air inlet and outlet place.

4) When inlet air pressure changes, the capacity of air dryer should be recalculate with the following correction coefficient table.

Regenerative desiccant compressed air dryer PB series

Design working conditions: working pressure: 7bar, air inlet temperature: 38℃, pressure dew point: -20℃

Regenerative desiccant compressed air dryer PF series

Design working condition: working pressure: 7bar, inlet air temperature: 38 ℃, pressure dew point: -40 ℃

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