https://doi.org/10.3390/pr8121531
“The experimental campaign concerning tests of CO2 adsorption was carried out in a laboratory-scale fluidization column made of plexiglas, with an internal diameter of 50 mm and 700 mm high, equipped with a porous plate between the two flanges at its bottom, acting as a gas distributor. The experimental facility is schematized in Figure 1.”
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In this sketch, the shaded zone represents the bed of fine adsorbent fluidized in the voids of the glass beads forming a much taller fixed bed (the clearer zone in the figure).
Glass beads have a diameter of 11 mm and a density of 2.48 g/cm3. Their packing, never subjected to fluidization, was always 450 mm high, so that its mass was of 1230 g. In it, a smaller amount of fine adsorbent was loaded by percolating through the voids of the glass beads, this material formed a bed of height Hfc, which gradually increases during the fluidization test. The gas utilized for fluidization of the fine adsorbent bed was air, whose flow rates were regulated by a set of two mass flow controllers covering the range 0 ÷ 6000 Nl/h. For the adsorption tests, the CO2 concentration in the gas feed stream was set by adding CO2 from a cylinder to the air supplied by a compressor. A column filled with zeolites and activated carbon was located before the CO2 mixing point to remove the humidity of the air. The total pressure drop across the solid bed was measured by a U-tube water manometer. The CO2 concentration in the gas stream entering or leaving the adsorption unit was measured by a gas analyzer, GA-21 plus (Madur Polska Sp. z o.o., Zgierz, Poland) and acquired on a personal computer. A thermocouple vertically immersed in the bed was used to determine its temperature.
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