Adsorption dryers with heat regeneration and with externally provided heating and blowing systems, require only small quantities of the already treated compressed air for purging and for building up pressure. The quantity of air required for regeneration is blown in, or drawn in, by means of a vacuum pump from the surrounding atmosphere. A heat source for regeneration can be provided by electrical energy, steam, hot water, heated oil or other energy carriers to be selected, and the drawn in ambient air heated by means of a heat exchanger. Blower regeneration is regarded as the classical dryer. An adsorption dryer with vacuum regeneration forms a logical and consistent further development.
There is a growing tendency for using such systems also in the lower performance ranges. Adsorption dryers with heat regeneration with a heating and blowing system external to the adsorber can suffer functional impairment through unfavourable conditions at the point of installation, i.e. be handicapped by the surroundings such as through: high ambient temperature high dust or moisture content in the surrounding air corrosive components in the surrounding atmosphere However, disadvantages of this type at the point of installation can be effectively eliminated by suitable measures. Operating by blower regeneration offers wide ranging freedom for adaptation to problematic marginal conditions. The regeneration system, consisting of a blower and a heater, is selected from a wide range of choices. Using different materials, specific requirements can be met.
