| 摘要 |
PURPOSE:To simultaneously remove SOx, NOx and CO2 from combustion exhaust gas containing SOx, NOx and CO2. CONSTITUTION:Gas to be treated and an absorbent (CaCO3 slurry) are brought into contact with each other in an absorbing reactor 1 to absorb SOx, NOx and CO2 in the gas. The absorbing solution is sent to a solid-liquid separator 2 to separate formed CaSO3 and CaSO4. The absorbing solution is further sent to a CO2 regenerator 3 and heated to decompose Ca(HCO3)2 formed in the absorbing process into CO2 gas and CaCO3 and the CO2 gas is subjected to a CO2 gas fixing and reutilizing process 6 and CaCO3 is recycled to the absorbing reactor. Continuously, a part of the absorbing solution is sent to a Ca(NO2)2 decomposing device 7 and Ca(NO2)2 formed in the absorbing process is heated to be decomposed into NO, NO2 and solid CaO. NO and NO2 are sent to an oxidizing device 5 to be converted to NO2 and a part of NO2 is added to the gas to be treated to be used in order to adjust the NO/NO2 ratio in the gas to be treated to 1. |
