Heat Regenerative Adsorption 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)

Influencing factors of adsorption in adsorption dryer

Adsorption refers to the action of various gases, vapours and solutes in solutions being adsorbed on the surface of solid or liquid substances. The adsorptive substance is called adsorbent, and the adsorbate is called adsorbate. Adsorption can be divided into physical adsorption and chemical adsorption. All solids have the ability to adsorb molecules, atoms or ions of the surrounding medium to their own surfaces to varying degrees. From the thermodynamic point of view, the reason why solid surfaces can adsorb other media is that solid surfaces have excess energy, which is physically called "surface free enthalpy". It has the tendency to adsorb other substances to reduce its own surface energy.

Common adsorbents include activated carbon, silica gel, activated alumina, diatomite, etc. Many precipitates generated in the electrolyte solution, such as aluminum hydroxide, iron hydroxide, silver chloride, also have adsorption capacity, and they can adsorb many ions in the electrolyte solution.

The adsorption capacity depends on the nature of the adsorbent, the specific surface area of the adsorbent, the nature and concentration of the adsorbate, and the temperature. Since adsorption occurs on the surface of the object, the larger the specific surface area of the adsorbent, the stronger the adsorption capacity. Activated carbon adsorption belongs to physical adsorption. Its huge surface area and complex pore structure make the specific surface area larger, so the adsorption capacity is very strong.

For a certain adsorbent, when the concentration and pressure of adsorbate are fixed, the higher the temperature, the weaker the adsorption capacity. Therefore, low temperature is favorable for adsorption. When the temperature is fixed, the greater the concentration and pressure of adsorbate, the stronger the adsorption capacity.

Heat regenerative adsorption air dryer PB series

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

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

What is slight heat? What are the advantages of this dryer?

What does the electric heater heat?

The electric heater heats the adsorbent!

Generally, about 10% of the air source will be introduced into the electric heater by the regeneration shut-off valve, heated to about 180 ℃, and then enter the regeneration tower for regeneration.

What's the use of heating adsorbent?

The function is the same as no heat, both for regeneration.

The meaning of "regeneration" is to dehydrate the adsorbent, and the heated gas can help dehydrate the adsorbent faster.

This is just like using an electric hair dryer. When we blow with a cold air, our hair won't dry after a long time, while the hot air can dry it at once.

What are the benefits of faster dehydration?

The advantage of faster dehydration is to increase the service life of adsorbent and valve.

As the dehydration is faster, the micro heat dryer does not need to switch the tower every 4-10 minutes, as it does without heat. Instead, it can wait until the adsorbent of a tower is almost full of water before switching for regeneration!

The adsorbent does not have to experience multiple discharge pressures, and the switching frequency of the valve is also greatly reduced, providing a guarantee for these consumables.

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