| 摘要 |
PURPOSE:To carry out denitrification and desulfurization of high efficiency simultaneously by introducing exhaust gas first to an electric dust collector, removing soot and then adding ammonia amounting reaction equivalent or more of NOX, denitrifying and then desulfurizing. CONSTITUTION:Combustion exhaust gas is introduced from a boiler 1 to an electric dust collector 3 through an air preheater 2 to firstly remove soot. Then, an ammonia injection section 5 is arranged on a flow path to a reduction denitrification reactor 6, and ammonia amounting reaction equivalent or more of NOX in exhaust gas is added, and denitrification is carried out by a catalyst such as active carbon. Further, a wet desulfurization device 7 is provided in the rear flow, and an SO2 absorbent is circulated to be brought into contact with the exhaust gas for gas-liquid contact to absorb and remove SO2. Thus, excessive ammonia in the reduction denitrification reactor 6 reaches the wet desulfurization device 7 together with the exhaust gas to be absorbed into slurry. Then the ammonia is turned into salt, and it coexists with the absorbent to accelerate the dissolution of the absorbent and improve the desulfurization efficiency. |
