The research of processes in compressed air drying units using composite adsorption materials

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Abstract
The presence of condensate in heat medium and gases leads to a deterioration in the operating conditions of units and automation systems. This leads to the equipment downtime and emergencies, as well as to the decrease in the quality of various technological processes in the machine-building, metallurgical, food, chemical, medical, gas and oil industries, transport [1], [5], [6], [8], [10]. To eliminate the probability of entering the condensate into the pneumatic systems of vehicles, adsorbing compressed air dryers are used. They must provide a decrease of the dew point temperature relative to the ambient temperature from 20°C to 40°C, in a wide temperature range of equipment operation (from minus 50°C to plus 65°C) during their entire service life with their compact placement on a vehicle. However, many current dryers do not fulfil the specified requirements, which poses the challenge for researchers to develop new technical solutions [4]. Intensive usage of adsorption materials in transport systems places high demands on their performance characteristics. They are: high strength, the possibility of placement in structures of complex configuration, the absence of abrasion, which are characteristic disadvantages of the operation of granular adsorbents [7]. The usage of composite adsorption materials (CAM) with the characteristics being purposefully controlled during their manufacturing process, makes it possible to eliminate the disadvantages of granular adsorbents and to create a wide range of competitive adsorption materials for their use in transport, providing the required dew point temperature. This paper represents the results of experimental studies of compressed air drying processes in transport adsorption plants with composite adsorption materials in the form of monoblocks (MA) and tubular adsorbent (TA) [2], [3]. The values of the decrease in the temperature of the dew point of compressed air relative to the ambient temperature, as well as the values of the hydraulic resistance of the layer of the composite adsorption material, have been determined. The dependence of the values of the dew point temperature on the value of the air consumption for the regeneration of the adsorbent is represented.

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