| Abstrakt: |
Zeolites are widely used in many industries: in water purification devices as adsorbents, ion exchangers, molecular sieves, in vacuum pumps of the sorption type. Also, zeolites are used as catalysts for many petrochemical and oil refining processes. For the effective use of zeolites, it is necessary to choose not only the right type of zeolite, but also to organize their regeneration, i.e. moisture removing from zeolites, which is carried out in the drying process. Currently, drying of zeolites is carried out using hot air, which is heated by an electric heater, or waste heat from industrial enterprises is used. The use of microwave heating qualitatively changes the desorption process. It is noted that the use of microwave heating allows the process to be conducted much faster, cleaner and with lower energy consumption compared to traditional methods. In addition, microwave drying can help reduce zeolite loss. The kinetics of cyclic and continuous microwave drying of 4A zeolite with bulk density ρ = 780 kg/m³ and equilibrium moisture content of 13.4% was studied. The methodology of experimental research is presented and the experimental equipment is described. The results of experimental studies of zeolite desorption during microwave energy supply to samples with a mass of 100, 200, and 300 g are given. A comparative analysis of the curves of changes in moisture content and temperature over time is carried out. The results of calculations of the main thermal characteristics of the drying process are given: heat of moisture evaporation, heat of heating the material, useful heat flow, efficiency. The possible reasons for the redistribution of heat flows into evaporation and heating in the drying process are analyzed. The course of the efficiency curves indicates a change in the dielectric characteristics of the zeolite during the drying process. [ABSTRACT FROM AUTHOR] |
