Affiliations: School of Environmental Science and Engineering, North
China Electric Power University, Baoding 071003, China | State Power Environmental Protection Research
Institute, Nanjing 210031, China
Abstract: In the presence of inhibitors, the macroscopical oxidation kinetics
of calcium sulfite, the main byproduct in wet limestone scrubbing, was studied
for the first time by adding different inhibitors and varying pH, concentration
of calcium sulfite, oxygen partial pressure, concentration of inhibitors and
temperature. The mathematical model about the general oxidation reaction was
established, which was controlled by three steps involving dissolution of
calcium sulfite, mass transfer of oxygen and chemical reaction in the solution.
It was concluded that the general reaction was controlled by mass transfer of
oxygen under uncatalyzed conditions, while it was controlled by dissolution of
calcium sulfite after adding three kinds of inhibitors. Thus, the theory was
provided for investigating the mechanism and oxidation kinetics of sulfite. The
beneficial references were also supplied for design of oxidation technics in
the wet limestone scrubbing.
