Intensification Effect of a Multi-Jet Structure on a Multiphase Flow and Desulfurization Process in a Fluidized Bed

Abstract

The introduction of a multi-jet structure at the bottom and middle of a fluidized bed can intensify the interphase mixing and improve desulfurization efficiency. The computational fluid dynamics were used to study the gas–liquid–solid flow in a bottom multi-jet fluidized bed and middle multi-jet fluidized bed (BMJFB and MMJFB). It was found that for the gas–liquid–solid interphase mixing, the intensification effect of introducing the multi-jet structure in the middle of the bed is more obvious than that in the bottom. The effect of the water spray volume flow rate on the MMJFB was examined under the same conditions. The results showed that with the increase of the water flow rate, the gas–liquid–solid interphase mixing and desulfurization process are promoted in the MMJFB, and its desulfurization efficiency reaches 68.2%. The effects of the width and number of multi-jet structures on the MMJFB were also investigated. The results show that when the jet width is 20 mm and the number of jets is four, the gas–liquid–solid three-phase is uniformly mixed and the desulfurization efficiency of the MMJFB equals 69.3%, which is 18.5% higher than that of the conventional fluidized bed.