Dry injection flue gas desulfurization process using absorptive soda ash sorbent

摘要

Hot flue gas containing sulfur oxides is treated in a dry injection desulfurization process by injecting a dry particulate soda ash sorbent into the SO2-contaminated gas stream, which must contain 0.5-10 wt % water and be at a temperature of 100 DEG -175 DEG C., and collecting the sorbent in a solids collection device like a baghouse filter. The dry soda ash sorbent is a porous sodium carbonate, derived from calcination of a NaHCO3-containing compound, and must have a minimum surface area of at least 2 m2/g and less than 10 wt % residual bicarbonate. In this process, at least 40% of the sorbent's sodium content is utilized in the desulfurization reaction, at a normalized stoichiometric ratio=1.