旋转填料床吸收NO_x缓冲氧化-强化吸收模型

Modeling of NO_x buffering oxidation and intensifying absorption in rotating packed bed

从平推流缓冲-氧化NO和旋转填料床强化吸收NOx的特性出发,建立了涉及平推流反应器中NO气相氧化和旋转填料床强化吸收NOx的物料衡算、气液传质、界面相平衡和液相反应等方程的数学模型,并应用表面更新理论求解了传质系数。结果表明:在NOx较高浓度条件下,短时间达到较高氧化度,在NOx较低浓度条件下,氧化度很快达到50%,但需要较长停留时间才能达到90%氧化度。超重力因子小于90时,NOx吸收率随超重力因子增加而增加,当超重力因子高于90时,吸收率随超重力因子增加而变化不大。模型的数据关联结果良好。

Based on buffering oxidation NO of plug flow and intensifying absorption NOx on rotating packed bed,a mathematical model describing the process of buffering oxidation and intensifying absorption NOx was established,including the constitutive equations involving the differential NOx mass balance in rotating packed bed,mass transfer rate between the gas and liquid phase,the phase equilibrium on the interface and reaction in the liquid phases.The mass transfer coefficient in the rotating packed bed was calculated by using the surface renewal theory.The results indicate that the oxidation degree reaches a high value in a short time at high concentration of NOx,while the oxidation degree reaches 50% quickly,then gradually to 90% in a long time at low concentration of NOx.The NOx removal efficiency increases with the increase of high gravity number which is less than 90,while there is no variation when high gravity number which exceeds 90.The mathematical model data show a good correlation.