Experimental study of the performance of an ALS (Air Lance Assembly) type oxidation device used in a wet flue gas desulfurization system

An oxidation device composed of an agitator and air lance assembly (ALS) and installed in a wet flue-gas desulfurization system underwent a simulation by using an aeration type of stirring reactor. An experimental study was conducted of the influence on oxidation performance of the ALS type oxidation device exercised by such factors as the hole opening direction and hole diameter (0.5-1.5 mm) of a sparger, stirring speed (150-350 r/min), apparent air velocity (0.8 × 10₃ - 5 × 10₃ m/s). The results of the study indicate that the hole opening direction and the hole diameter of the sparger has a relatively small influence on the oxidation rate. With an increase in stirring speed and the apparent air velocity there will be an increase in oxidation speed. However, when the apparent air speed increased to a certain value, the oxidation rate increase tends to slow down. A theoretical analysis and calculation was conducted by using a two-film model. The calculation results are in relatively good agreement with test results.