Long Xiang-li, Xiao Wen-De, Yuan Wei-kang
UNILAB, State Key Laboratory of Chemical Reaction Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
J Hazard Mater. 2005 Aug 31;123(1-3):210-6. doi: 10.1016/j.jhazmat.2005.03.039.
Wet ammonia desulphurization process can be retrofitted for combined removal of SO2 and NO from the flue gas by adding soluble cobalt(II) salts into the aqueous ammonia solutions. The Co(NH3)6(2+) formed by ammonia binding with Co2+ is the active constituent of scrubbing NO from the flue gas streams. A stirred vessel with a plane gas-liquid interface was used to measure the chemical absorption rates of nitric oxide into the Co(NH3)6(2+) solution under anaerobic and aerobic conditions separately. The experiments manifest that the nitric oxide absorption reaction can be regarded as instantaneous when nitric oxide concentration levels are parts per million ranges. The gas-liquid reaction becomes gas film controlling as Co(NH3)6(2+) concentration exceeds 0.02 mol/l. The NO absorption rate is proportional to the nitric oxide inlet concentration. Oxygen in the gas phase is favorable to the absorption of nitric oxide. But it is of little significance to increase the oxygen concentration above 5.2%. The NO absorption rate decreases with temperature. The kinetic equation of NO absorption into the Co(NH3)6(2+) solution under aerobic condition can be written as.
通过向氨水溶液中添加可溶性钴（II）盐，湿式氨脱硫工艺可进行改造，以联合脱除烟气中的SO2和NO。氨与Co2+结合形成的Co(NH3)6(2+)是从烟气流中洗涤NO的活性成分。使用具有平面气液界面的搅拌容器分别测量在厌氧和好氧条件下一氧化氮向Co(NH3)6(2+)溶液中的化学吸收速率。实验表明，当一氧化氮浓度处于百万分之几的范围内时，一氧化氮吸收反应可视为瞬间反应。当Co(NH3)6(2+)浓度超过0.02 mol/l时，气液反应变为气膜控制。NO吸收速率与一氧化氮入口浓度成正比。气相中的氧气有利于一氧化氮的吸收。但将氧气浓度提高到5.2%以上意义不大。NO吸收速率随温度降低。有氧条件下一氧化氮向Co(NH3)6(2+)溶液中吸收的动力学方程可写为。
