Hydrodynamics and mass transfer in cross-flow rotating packed bed

CO2 capture from hot stove gas in steel making process

“…2 that the capture efficiency was very low at a rotating speed of 100 rpm, because the centrifugal force is not high enough to generate small liquid droplets and thin films over the packing. When the rotating speeds were equal to and higher than 700 rpm, a similar trend as that reported by Guo et al (1997), capture efficiency was nearly invariant, was observed. These capture efficiency results indicate that small liquid droplets and thin films, favorable to mass transfer, could be formed at relatively higher rotating speeds.…”

Concentration of solution in cross-flow rotating packed bed contactor

“…On the other hand, the negative value of the interactive coefficient suggests that amount of water evaporated decreases beyond the optimum level indicating a decrease of K Y a. Such trend in K Y a with increase in the gas flow rate can be noted in the results reported by Guo et al (1997). The resistance offered by the rotating packing could force a fraction of the air to bypass it and flow around the outer edges of the RPB.…”

“…Besides these, the initial temperature of feed and feed concentration would influence the vapor pressure of water and, hence also the efficacy of the liquid concentration process in the equipment. It can be noted from the results of the experimental study presented by Guo et al (1997) for ammonia absorption in water at constant temperature in a cross-flow RPB that the volumetric mass transfer coefficient initially increases and then decreases with increase of gas flow rate at lower values of liquid flow rate. In this study, the air flow rate, liquid flow rate, and rotor speed were selected as independent variables and water evaporation rate as the response to investigate the possibility of mass transfer rates obtained in the cross-flow RPB for concentration of liquids having similar trends as the volumetric mass transfer coefficient reported previously.…”

Mass transfer characteristics in a rotating packed bed with split packing

“…These previous researches strongly indicate that the gas mass transfer coefficient can be enhanced in a split packing RPB. However, Guo et al [19] used a physical absorption system NH 3 -H 2 O and a chemical absorption system SO 2 -NaOH to study the mass transfer characteristics in a cross-flow RPB, and the results show that the gas volumetric mass coefficient for SO 2 absorption is higher than NH 3 absorption by 70%. The enhancement is possibly due to the effect of chemical reaction, and there may be a chemical acceleration in the mass transfer process.…”