The Research of Slurry Foaming of Wet Flue Gas Desulfurization System of Steel Works

Abstract

This paper focus on the analysis of the slurry foam of the sinter band plant Wet Flue Gas Desulfurization (WFGD) process, and put forward suggestions according to the actual conditions of the Steel Works. The experimenter compared the actual operating parameters of slurry and system design parameter. Then found out the main incentive to form foam on top of the absorber’s slurry tank. This paper analyzed the major constituents of overflow foaming of WFGD system. Analysis results indicated that it is the same composition of byproducts gypsum of WFGD. So the experiment focus on the research of slurry constituents of the absorber. The result of basic data analysis shows that the slurry density of absorber is 1.25Kg/L which exceeds the maximum design value i.e.1.15Kg/L, and the Chloride concentration is 80000mg/L which exceeds the maximum design value i.e. 15000mg/L. The supernatant of slurry is formed of colloidal solution and the solid percentage of supernatant slurry is 10.64% (Weight percentage). Meanwhile the supernatant slurry shows Tyndall phenomenon significantly, and the remaining solution indicators are much higher than the design value. For identification purpose, the experimenter had an experiment about desulfurization slurry and found the relationship among solid content, supernatant concentration, foaming ability and foaming stability. Experimental results show that the foaming ability get strong first and then get weak with the increase of the solid content and the foaming ability get weak gradually with the decrease of the concentration of Mg2+and Cl-. The slurry almost has no foaming when the solid content is less than 10% and the concentration of Mg2+ less than 1000mg/L and the concentration of Cl- less than 20000mg/L.