| 主权项 |
1. A system for reducing the acid gas concentration in a combustion flue gas and/or reducing acid gas sorbent consumption while not increasing NOx generation, comprising:
a reactor for producing (i) combustion flue gas containing at least one acid compound, the at least one acid compound including at least one of sulfur dioxide, sulfur trioxide, hydrochloric acid, sulfuric acid, hydrofluoric acid or mixtures thereof, and (ii) bottom ash containing alkali, the bottom ash being discharged separately from the combustion flue gas, the reactor further comprising fluid cooled enclosure walls, the walls having a membrane tube wall construction, the reactor having a lower portion, an upper portion, and an exit opening; a first particle collection area proximate the exit opening; heat transfer surface proximate the first particle collection area; a second particle collection area proximate the heat transfer surface; an economizer proximate to said second particle collection area; a spray dryer absorber, proximate to said economizer, for receiving the combustion flue gas; means for introducing the bottom ash into the combustion flue gas downstream of the reactor at a location upstream of and/or within the spray dryer absorber so that the alkali is available in the spray dryer absorber for reacting with the at least one acid compound; and means for introducing a humidifying agent into the spray dryer absorber to facilitate the reaction of the alkali with the at least one acid compound to reduce the acid gas concentration in the combustion flue gas, the humidifying agent including at least one of water and an alkali-containing slurry. |
