Know everything about adsorption desiccant and their principle work is very important. Air dryers can work due to cold and hot regeneration. In addition, it is necessary to take into account the types of adsorbents, the scope of use and nuances of choice.
Types and principle of work
From a technical point of view, the adsorption dryer of air is a very complex device. Its important part is the rotor. It looks like a large drum, intensively picking moisture from the air due to the inside the special substance. But the arrival of air jets into the drum itself occurs through the channel of the tributary. When filtering in the rotary node is completed, the mass of the air is reset through another channel.
It is worth noting the presence of a heating unit. Special thermal circuit increases the temperature, increasing the intensity of regeneration. Inside there is a special air duct separating the unnecessary flow from the rotor. The main scheme of action is as follows:
- The air enters the rotor into the rotor;
- The substance takes water from the jet;
- on a special channel air is carried out further;
- In the branch, part of the air after drying enters the heating node;
- Thus, the flow thus dries the moisturizing adsorbent;
- Then he is already reset outward.
The apparatus of cold regeneration implies the purge of the pre-drained mass through the adsorber. Water is going in it and follows from the bottom, then removed. Cold option is simple and cheap. But it allows you to cope only with relatively small streams. The speed of the jets should be 100 cube. m for 60 seconds. Hot regeneration devices can work on an external or vacuum scenario. In the first case, moving masses are heated in advance, external heating systems are used for this purpose.
Special sensors track overheating. Air is under elevated (compared to atmospheric) pressure. Expenses for such hot regeneration are very high. As a result, the use of such equipment for small amounts of air is inexpedient economically. Vacuum approach also requires heating. Therefore, a special warmer contour is necessarily included. True, pressure is inferior to ordinary atmospheric pressure.
Adsorbing nodes are cooled due to atmospheric contact. In this case, the losses of the drained stream are guaranteed to be prevented.
Varieties of adsorbents
The ability to absorb water from air to have quite many substances. But that is why Proper selection of them is critical, otherwise it is not possible to ensure sufficient drying efficiency. Cold regeneration technique implies the use of molecular sieves. It is made from aluminum oxide, which is pre-leading to “active” condition. A similar format manifests itself in moderate latitudes; The main thing is that street air does not cooled more than up to -40 degrees.
Hot dryers typically use a solid adsorbent. In many systems, silica gel is used for this purpose. It is released by applying saturated silicic acids mixed with alkaline metals. But a simple silica gel is chemically destroyed when contacting drip moisture. Eliminate the problem helps the use of special types of silica gel, which are specifically designed to take into account its purpose. Also actively use zeolite. This substance is created on the basis of sodium and calcium. Zeolite picks up or gives out water. Therefore it would be more correct to call not an adsorbent, but a moisture regulator. Zeolite activates ion exchange; This substance retains efficiency at temperatures from -25 degrees, and with severe frost does not bring results.
Scope of application
Drazers of the adsorption type are used in a wide variety of areas. They are used in domestic conditions for maintaining a good microclimate in homes and apartments. But the elimination of excess moisture is suitable not only there. This type of equipment is also used:
- on machine-building enterprises;
- in medical institutions;
- on the facilities of the food industry;
- in warehouses of various types;
- in industrial refrigeration chambers;
- in museum, library and archival practice;
- for storing fertilizers and other substances requiring limited air humidity;
- in the process of transporting bulk cargo by water transport;
- on the production of microelectronic components;
- at the enterprises of the military-industrial complex, the aerospace industry;
- When operating pipelines, distinguishing compressed air at low ambient temperatures.
Adsorption systems need to be chosen carefully and for production, and for use at home. But if the apartment is turned around in the apartment only inconvenience, then in industry their price is significant material losses. Only a competently selected model allows you to perform all the tasks. The key value is “Class of deduction”. Products 4 Categories are able to dry compressed air only to the point of dew +3 degrees – this means that at a smaller temperature, condensation will be formed.
Similar equipment is only suitable for heated premises. If the protected contours and objects go beyond their limits, and the drainage is needed not only in the warm season, you need a more advanced device. Construction 3 categories can be stably operating at temperatures up to -20 degrees. Models 2 groups are designed to operate in frost to -40. Finally, modifications 1 level can confidently work at -70. In some cases, the “zero” class is distinguished. It is created taking into account particularly powerful requirements. The dew point in this case is given by the designers individually.
Cold regeneration is optimal in a minute circulation to 35 cubic meters. m of the air. With more intensive operation, only “hot” version will be suitable.