METHOD AND SYSTEM FOR SO2 AND SO3 CONTROL BY DRY SORBENT/REAGENT INJECTION AND WET SCRUBBING

摘要

The present invention relates to a method and system for removing SO ₂ and SO ₃ from flue gas generated by combustion of fossil fuels. According to the invention, the particulates are removed from the flue gas to produce a partially purified flue gas, and preferably a sufficient amount of dry absorbent comprising calcium, sodium or magnesium, having a particle size of 1.0 to 2.0 microns or more, injecting a gas to prepare a substantially-free flue gas to SO ₃ substantially free of all of SO ₃ was removed by the reaction of dry absorbent and does not react dried sorbent from the flue gas purification in part by reaction with SO _3. The flue gas substantially free of SO ₃ is transferred to a wet scrubber device for SO ₂ removal to produce purified flue gas. In the first embodiment, a sufficient amount of dry absorbent is supplied to remove the desired amount of SO ₃ and SO ₂ . In a second embodiment, the supplement supplied by the wet scrubber wets the dry absorbent and does not react as a reagent for SO ₂ removal by removing the dry absorbent that does not react with the reacted dry absorbent from the flue gas that is substantially free of SO _3. preparing a dry sorbent and the dry absorbing agent does not react with the reaction supplements and SO ₂ and substantially to produce a flue gas purified by removing the SO ₂ from the flue gas with no SO _3.