engleski

Process Optimization of S (IV) Oxidation in Flue Gas Desulfurization Scrubbers

At present, the control of oxidation process is imprecise in the wet flue gas desulfurization system. Inthis study, a modified oxidation model is established to investigate convective mass transfer of O2andthe oxidation of S (IV) under natural and forced oxidation conditions. By comparison, the model resultsare in good agreement with experimental results. Based on the motion of droplet in the scrubber andbubble in the slurry pool, natural oxidation rate is calculated to provide guidance for forced oxidation andrecommended oxidation air flow rate. Droplet accelerates until it reaches terminal velocity. Mass transferresistance mainly occurs in the liquid film. The mass transfer flux of the droplet with diameter of 1.5 mmincreases continuously until it remains stable. The natural oxidation rate increases with the increasingof inlet O2concentration while the forced oxidation rate increases with the increasing of oxidation airflow rate. Several gas flow rates are taken into consideration to obtain the optimal oxidation air flow rate, showing that smaller drop diameter has positive impact on oxidation process in flue gas desulfurization scrubbers.

SO2 ; Sulfite oxidation ; Mass transfer ; Scrubber

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