This paper presents a novel wet flue
gas desulfurization (FGD)
technology based on a basic aluminum sulfate (BAS) desorption regeneration
process, in which ethylene glycol (EG) was first employed to inhibit
the byproduct oxidation. The operating parameter effect on SO2 absorption efficiency and oxidation efficiency of sulfite
was thoroughly examined in a lab-scale bubbling column. The results
indicated that both the amount of aluminum and basicity play important
roles on the desulfurization time with above 90% absorption efficiency.
The BAS-based desulfurization process was more suitable for a low
temperature and low gas flow rate. High inlet SO2 concentrations
may contribute to the mass-transfer rate of SO2, and the
SO2 absorption efficiency remained above 90% when the pH
value was over 3.10. With the addition of 1% (v/v) EG in BAS solution,
the oxidation efficiency dropped dramatically from 86 to below 10%
(in 120 min). On the basis of the two-film theory, a model of the
SO2 absorption process was developed and the mass-transfer
characteristics were analyzed. The calculation results indicated that
the SO2 absorption process for this system was decided
by a combination of both the gas- and liquid-phase diffusion controls.
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