高压鼓泡反应器中NOx吸收过程及建模

NOx Absorption Process and Modeling in High Pressure Bubbling Reactor

基于鼓泡反应器对NOx吸收中气相NO、NO2和HNO2,液相NOx进行量化,实现NOx质量守恒的测量,误差在±8%以内.建立三区反应模型,以气相出口NO和NO2测量值与模拟值的相对误差为目标函数,获得了最优NO2和NO传质系数、NO氧化动力学常数、液膜体积和表面积等参数.液膜区中HNO3浓度是鼓泡区的193-357倍;NO2和NO吸收分别受气相扩散和液相控制;NO氧化反应受压力影响大,主要是链式反应控制;反应器中液膜产生的本质猜测是气泡夹带的液滴吸附于内表面.

Based on the quantification of gas phase NO,NO2,and HNO2,and liquid phase NOx in a bubbling reactor,NOx balance measurement was achieved with a relative error within±8%.A three-region reaction model was set up.The relative errors between the measured and modeled NO and NO2 at the outlet of gas phase were chosen as the objective function to obtain the optimum parameters,including NO2 and NO mass transfer coefficients,NO oxidation rate constant,and volume and surface area of liquid film.The concentration of HNO3 in the liquid film region was 193—357 times of that in the bubbling region.The absorption of NO2 and NO was controlled by gas and liquid diffusion,respectively.NO oxidation reaction was greatly influenced by reactor pressure and controlled dominantly by chain reactions.The formation of liquid film region in the reactor was presumably due to gas bubbling entrainment and attachment onto the inner surface of the reactor.