Method and apparatus for desulfurizing exhaust gas.

摘要

In a method and apparatus for desulfurizing exhaust gas, wherein combustion furnace desulfurization and flue desulfurization by means of limestone are effected, a desulfurization rate is enhanced, a dust precipitator is operated stably, and generation of harmful substance (CaSO3) is suppressed. The present invention proposed a method for desulfurizing exhaust gas, wherein desulfurizing operations within a combustion furnace and within an exhaust gas flue by means of limestone are combined. The method is characterized in that after fly ash produced after desulfurization within the exhaust gas flue serving as a desulfurizing flue was collected, a part or whole of the fly ash is again charged into a high-temperature section within the combustion furnace , collection of the fly ash is carried out at the outlet of the combustion furnace and at the upper stream of the desulfurizing flue, an effective component part of said collected fly ash is used as a desulfurizing agent within the desulfurizing flue , and the remainder publicly harmless component part is abandoned to the outside of the system. <IMAGE>