Trans RINA, Vol 161, Part A4, Intl J Maritime Eng, Oct-Dec 2019


velocity 2m/s, 400ºC initial gas temperature and 20ºC initial droplet temperature.


Three initial SO2


concentrations were analyzed: 1,000, 750 and 600ppm. As can be seen, high SO2 concentrations promote S absorption, and a 21.5% increment in the absorbed S was obtained from 600ppm to 1,000ppm.


Figure. 12 indicates the S absorbed by a droplet against time for several initial


droplet temperatures. This figure


corresponds to 200μm initial droplet diameter, 2,400μmol/kg alkaline concentration, 600ppm SO2 concentration, free stream initial velocity 2m/s and 400ºC initial gas temperature. As can be seen, S absorption is improved when the droplet temperature is decreased, and a 2.2% variation in the absorbed S was obtained from 20ºC to 60ºC. The reason is that the concentration of SO2 at the interphase is higher due to a higher value of the Henry’s constant, indicated by Eq. (7).


3.4 EFFECT OF THE TEMPERATURE


Figure 10. S absorbed by a droplet for several SO2 initial concentrations. 200μm initial droplet diameter, 2,400μmol/kg alkaline concentration, 400ºC initial gas temperature and 20ºC initial droplet temperature.


3.3 EFFECT OF THE ALKALINITY


Figure. 11 indicates the S absorbed by a droplet against time for several


alkaline concentrations. This figure


corresponds to 200μm initial droplet diameter, 600ppm SO2 concentration, free stream initial velocity 2m/s, 400ºC initial gas temperature and 20ºC initial droplet temperature. As can be seen, as alkalinity is increased SO2 absorption is increased too, and a 19.8% increment in the absorbed S was obtained from 2,400µmol/kg to 5,000 µmol/kg.


Figure. 13 indicates the influence of the gas temperature. As can be seen, higher gas


temperatures


absorption, and a 16.3% variation in the absorbed S was obtained from 400ºC to 500ºC. The effect


reduce S is more


important than raising the droplet temperature. The reason is that higher gas temperatures induce higher interphase temperatures and concentrations at the interphase.


thus lower SO2


Figure 12. droplet


2,400μmol/kg alkaline concentration, 600ppm concentration and 400ºC initial gas temperature.


S absorbed by a droplet for several initial temperatures. 200μm initial droplet diameter, SO2


Figure 11.


S absorbed by a droplet for several initial


alkalinities. 200μm initial droplet diameter, 600ppm SO2 concentration, 400ºC initial gas temperature and 20ºC initial droplet temperature.


©2019: The Royal Institution of Naval Architects


Figure 13. S absorbed by a droplet for several initial gas temperatures. 200μm initial droplet diameter, 2,400μmol/kg alkaline concentration, 600ppm concentration and 20ºC initial droplet temperature.


SO2 A-341


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