The process of the suction dryer includes two steps of adsorption and regeneration, both of which require the use of desiccant activated alumina.
What is the role of active desiccant alumina in the drying machine?
Activated alumina is used as a desiccant to absorb moisture in the compressed air during the adsorption process of the dryer. During the regeneration process of the dryer, the activated alumina will lose moisture and maintain a dry state again to meet the next adsorption effect.
Alumina is a porous substance. The internal surface area of each gram of alumina is as high as hundreds of square meters. Its physical properties determine that it has a strong adsorption force for substances with strong molecular polarity such as water, and this adsorption capacity will vary. It changes with the change of adsorption temperature. The lower the adsorption temperature, the stronger the adsorption capacity of the adsorbent. When the water-containing compressed air passes through the adsorber filled with activated alumina, the physical properties of alumina mentioned above are used to adsorb the water in the compressed air in the large pores of the alumina, so as to achieve the purpose of drying the compressed air. . When alumina works for a certain period of time and the adsorbed water reaches saturation equilibrium, it will no longer adsorb the water in the compressed air. Because alumina has the characteristic that the adsorption capacity changes with temperature changes, it can be used for oxidation. Aluminum undergoes heat treatment to restore its adsorption capacity. It is precisely because activated alumina itself has these characteristics that we can recycle it through heating and regeneration, which makes the adsorption drying process widely used in actual industrial applications. The life of activated alumina is based on the temperature of the intake air, ranging from 2 to 6 years. You can judge whether a desiccant is needed according to the filter after the dryer. If the filter drains, you need to replace it with activated alumina desiccant immediately , It can also be judged according to the shape of the desiccant and the actual situation of the gas end. The hazards of using a desiccant over time, the activated alumina desiccant loses its activity, cannot drain the water, and the water content of the compressed air exceeds the standard. It affects the normal operation of the gas equipment and the production quality of the product. The activated alumina desiccant fails and the active powder falls off. Dryer life.