Abstract
Previous experiments with the spray scrubber pilot-plant CASPAR have demonstrated a CO2 removal rate (RR) of nearly 90% at 47 m overall spray column height with a 30 wt-% monoethanolamine (MEA) solution, a liquid-to-gas (L/G) ratio of 4.9 L m-3 (STP) and a sauter mean diameter D3/2 of 1.6mm and confirmed the applicability of a spray absorption technology for post combustion CO2 capture (PCC). Further investigations with 30 wt-% MEA and different spray nozzles show positive effects on the absorption behaviour due to smaller droplet sizes. With D3/2 of 1.1 mm it was possible to achieve a RR of 83% at 44.5 m overall absorber height, where the RR is 11 percentage points higher than for D3/2 of 1.6 mm at the same height. The influence of the solvent properties dynamic viscosity and surface tension on the droplet size and mass transfer performance is discussed and is also presented.
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