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X. Li et al.
Fig. 3 Effect of the gas flow rate change on volumetric mass transfer coefficient and CO 2 utilization
ratio. (Color figure online)
Effect of Gas Flow Rate on Absorption Rate
When the liquid flow rate was constant, the volumetric mass transfer coefficient and
CO 2 utilization rate were obtained by changing the gas flow rate with a constant liquid
flow rate. It can be seen from Fig. 3 that with the increase of gas flow rate, the volumetric mass transfer coefficient first increases and then decreases, and the utilization
rate of CO 2 gradually decreases. It shows that under the condition of constant liquid
flow rate, the increase of gas flow rate can accelerate the mass transfer rate between
gas and liquid. However, when the absorption of CO 2 by NaOH reaches saturation,
the mass transfer rate becomes slow, and the utilization rate of CO 2 decreases with
the increase of gas flow rate. In the experiment, the gas flow rate can be 1.5 ~ 2.0
m
3 /h.
Effect of Liquid Flow Rate on Absorption Rate
When the gas flow rate was constant, the influence of the liquid flow rate on the
absorption rate was studied by using the DN 16 mm Bauer ring. With the increase
of liquid flow rate, the volumetric mass transfer coefficient and CO 2 utilization efficiency η also increase, which indicates that the increase of liquid flow improves the
spray density in filled tower and the wettability between fillers, increases the contact
area between gas and liquid, and increases the mass transfer rate. Moreover, when
the concentration of CO 2 is unchanged, the more NaOH absorption liquid enters the
X. Li et al.
Fig. 3 Effect of the gas flow rate change on volumetric mass transfer coefficient and CO 2 utilization
ratio. (Color figure online)
Effect of Gas Flow Rate on Absorption Rate
When the liquid flow rate was constant, the volumetric mass transfer coefficient and
CO 2 utilization rate were obtained by changing the gas flow rate with a constant liquid
flow rate. It can be seen from Fig. 3 that with the increase of gas flow rate, the volumetric mass transfer coefficient first increases and then decreases, and the utilization
rate of CO 2 gradually decreases. It shows that under the condition of constant liquid
flow rate, the increase of gas flow rate can accelerate the mass transfer rate between
gas and liquid. However, when the absorption of CO 2 by NaOH reaches saturation,
the mass transfer rate becomes slow, and the utilization rate of CO 2 decreases with
the increase of gas flow rate. In the experiment, the gas flow rate can be 1.5 ~ 2.0
m
3 /h.
Effect of Liquid Flow Rate on Absorption Rate
When the gas flow rate was constant, the influence of the liquid flow rate on the
absorption rate was studied by using the DN 16 mm Bauer ring. With the increase
of liquid flow rate, the volumetric mass transfer coefficient and CO 2 utilization efficiency η also increase, which indicates that the increase of liquid flow improves the
spray density in filled tower and the wettability between fillers, increases the contact
area between gas and liquid, and increases the mass transfer rate. Moreover, when
the concentration of CO 2 is unchanged, the more NaOH absorption liquid enters the