Why is an adsorptiondryer important?

In a compressed air system a drying proces can remove all moisture that emerges during the compression of air. This helps reducing the risk of corrosion damages in the compressed air system.

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A drying proces removes moisture from the compressed air by two drying methods. The process can either proceed with the application of a refrigerated dryer or adsorption dryer. The choice of drying method depends on air quality demands. 

Usually, a refrigerated dryer can live up to most quality demands for compressed air, but for certain industrial purposes, e.g. food and pharmaceutical industry, an adsorption dryer would be a better choice. An adsorption dryer can live up to higher demands for the quality of compressed air, as deliver a dew point all the way down to -70 °C. So if your processes demands very dry compressed air, an adsorption dryer is better suited to ensure optimal drying of compressed air and thus ensuring a longer lifetime for connected machines and tools. 

Are you in doubt as to whether your requirements for the compressed air mean that the drying process should be a refrigerated dryer or adsorption dryer?

Get in touch with an advisor today and get help to make the right choice.

How does an adsorptiondryer function?

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We all know the little bag at the bottom of the box when we have ordered an item online. The small bag is a miniature model of how an adsorption dryer works, as the bag absorbs moisture during transport, so that our ordered goods do not get water damage. The contents of the bag are often a desiccant, silica gel, which an adsorption dryer can also contain. An adsorption dryer may also have the desiccant alumina or a mixture of the two desiccants in its two pressure tanks. To remove the moisture from the compressed air, the air passes through one of the tanks and thereby comes into contact with the desiccant to a dew point of -20 ° C or lower. The majority of the dry compressed air is led directly into the compressed air system, but a small percentage of 3-15% is led into the opposite tank, where the air expands to atmospheric pressure and absorbs the moisture from the desiccant in the other tank. The air is then released into the surrounding environment along with the moisture. An adsorption dryer is a continuous drying process, as the tanks change function after a certain period of time.

Installation of an adsorptiondryer

An adsorption dryer is sensitive to oil and water in the compressed air. The installation of an adsorption dryer must therefore always be after the oil filter and water separation filter in the compressed air system, as otherwise the dryer may be damaged.

How do you choose the right adsorption dryer?

There are many different factors you need to consider when choosing an adsorption dryer. One way to limit the range of adsorption dryers is by knowing the requirement for the pressure dew point.

There are three different dew points for an adsorption dryer: -20, -40 and -70 ° C. A rule of thumb may be that the greater the requirement for the pressure dew point, the higher the pressure dew point must be.

Do you need help choosing the right adsorption dryer? Then in touch with a counselor today!

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