针对烟道气中低浓度NO难以脱除的特点，采用臭氧氧化-液相吸收的工艺进行脱硝中试实验研究，利用O₃的强氧化性特点，将NO氧化为易溶于水的NO₂，在鼓泡塔中用吸收液进行吸收反应。考察了烟道气的氧含量、吸收液的pH及吸收温度等条件对NO吸收效率的影响。实验结果表明，O₃停留时间对NO的氧化率影响不大；当n（O₃）/n（NO）=0.7时，NO的氧化率可达83%；在通入O₃的条件下，烟道气的含氧量对NO的氧化率影响不大；当进气量为0.5 m³/h，脱硝效率可达81%；碱性环境中，吸收液的pH适宜维持在8；在20~70℃温度范围内，吸收液的温度对脱硝效率影响较小。

In the light of difficulty to remove low concentration NO in flue gas,through laboratory simulation of flue gas,the process of ozone oxidization-liquid phase absorption is used to carry out pilot experimental study for denitration.By means of strong oxidation of ozone,NO is oxidized into water soluble NO₂ that reacts with absorption solution in the bubble reactor.The influences of oxygen content in flue gas,ozone concentration,pH of absorption solution and reaction temperature on the recovery rate of NO are investigated.The pilot results show that the residence time of ozone has a little influence on the oxidation of NO.When n(O₃)/n(NO)=0.7,83% of NO can be oxidized into NO₂.The oxygen contention in flue gas influences the oxidation of NO slightly when ozone is fed.When the entry rate of flue gas is 0.5 m³/h,the NO removal efficiency can reach 81%.The optimum pH for absorption solution is 8.The temperature of absorption solution in the range from 20℃ to 70℃ has a slight influence on the removal of NO.

孙涛略(1989-),男,硕士生