At the reference gas feed rate, GA=30 molm-2S-1, and the CO2 recovery ratio, αR=0.8, the total volume is about 25 m3, which means that the space for the packed columns is about one twentieth of the engine volume, where the typical volume of the diesel engine of the 10,000 kW class is about 500 m3.
In Figs. 5 to 7, the effects of the gas feed rate and the liquid feed rate on the net output power and the total volume of the packed columns are similar to that in Fig.4.
4.2 Effects of Parameters of Solution
Fig. 8 shows relations of the net output power, Pn, and the volume of the packed columns, Vcol, versus the CO2 recovery ratio, αR, where the varied parameter is stripping temperature, ts. The higher the stripping temperature, the lower the net output power, but not much; because the higher stripping temperature needs higher exit gas temperature of the turbocharger which results in increase in the booster power. The volume of the packed columns reduces and the attainable maximum CO2 recovery ratio increases at the higher stripping temperature because of the higher equilibrium CO2 partial pressure in the liquid phase (discussed later in section 5. 1).
Fig. 9 and Fig. 10 show the effect of the MEA concentration of the solution, CMEA, and the highest loading factor, φh, respectively. The net output power do not change a lot but the attainable maximum CO2 recovery ratio is higher at higher MEA concentration and CO2 loading factor.
