AECOM
PROCESS FOR REMOVING SO2 FROM FLUE GASES USING LIQUID SORBENT INJECTION

Abstract:

Finely atomized alkaline sorbent salt solutions are injected into a hot flue gas stream to remove SO.sub.2. Flash evaporation of the droplets produces very fine dried sorbent particles, which react efficiently with SO.sub.2 in the flue gas. The liquid sorbent may be sodium carbonate, sodium hydroxide, sodium sulfite, potassium carbonate, potassium hydroxide or the like. In a coal-fired boiler, the liquid sorbent may be injected after the economizer section, where the flue gas temperature is below 850.degree. F., and upstream of a particulate collection device. The dried sorbent particles react with SO.sub.2 and then are removed from the flue gas stream in the particulate collection device, producing a cleaned flue gas stream.