Experimental set up of small-scale (10kg/day) experimental apparatus of CO2 capture and recovery

“Figure 1 shows the small-scale experimental apparatus of CO2 capture and recovery. It consists of one pair of
absorber and stripper circulating an amine solution, which is the same configuration as actual CO2 capture and
separation plants. The absorber is a cylindrical tube with inner diameter of 30 mm packed with Dixon packing and can
recover CO2 of 10kg/day. Carbon dioxide and diluting N2 gases are controlled at each constant flow rate by mass flow
controllers (MFCs) and the mixed gas flows into the absorber from the bottom to the top. Reversely, amine solution
flow into the absorber from the top to the bottom and its flow rate is controlled by a plunger pump in accordance with
a constant liquid to gas ratio (L/G) of 4.0 ~ 6.0 L/m3. The stripper is a cylindrical chamber with inner diameter of 29.4
mm insulated thermally by vacuum insulation. The CO2-rich solution from the absorber was pumped into the stripper
chamber via the top inlet being controlled at a constant flow rate, and temperature. An electric heater inserted
into the bottom of the stripper chamber heated the solution and its heat input was electrically measured by a
power meter. The stripper chamber was pressurized at 100 ~ 150 kPaG kept by a back pressure valve. The regenerated
lean-solution was pumped out fr om the bottom and its CO2 loading, ݉m(out) was quantified by a total organic carbon
(TOC) analysis. Mixture gas of CO2, steam and negligible amount of amine vapour came out from the top of the
stripper. After a cooling process, both flow rates of the CO2, ܹ w(CO2) and the condensed water, ܹ Wv were measured
separately by a gas meter and a weight scale, respectively.
Fig. 1. Schematic of small-scale (10kg/day) experimental apparatus of CO2 capture and recovery.”


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