| 摘要 |
A method of scrubbing a boiler exhaust gas stream containing pollutants comprising one or more of the acidic oxides of sulfur, nitrogen and carbon and compounds of any of the halogens while producing useful or benign products, which comprises contacting the stream with a solution derived from dissolving in water the soluble components of ash containing as solids one or more of alkali and alkaline earth metal salts to produce a basic (pH greater than 7) solution. The pollutants react with the water therein to produce acids. The latter react with any oxides, hydroxides and carbonates of alkali and alkaline earth metals therein derived from the ash to yield a solution of alkali and alkaline earth metal salts and anionic salt components, namely, carbonate, sulfate, sulfite, nitrate and nitrite, and compounds of the halogens, along with a precipitate of alkali and alkaline earth metal salts with any insoluble components of the ash. |
