旋转填充床强化吸收模拟烟气中NO的研究

On the removal of NO from the simulated exhaust gas waste by using a rotating packed bed

旋转填充床(RPB)是一种新兴、高效的气液传质设备。以H_2O_2、NaOH及H_2O_2+NaOH复合溶液作为吸收液,采用旋转填充床对含NO模拟烟气的吸收过程进行试验,考察了PRB的转速、气液比对超重力旋转填充床强化传质性能的影响,不同种类的吸收液及浓度、吸收反应时间对脱除低浓度NO效率的影响,以及吸收产物的种类及分布。结果表明,当超重力旋转填充床的转速为900 r/min、气液比为5∶1时,以0.8 mol/L H_2O_2为吸收液的NO脱除率为38%;以0.01 mol/L NaOH为吸收液的NO脱除率为34%;以0.03 mol/L NaOH和0.4 mol/L H_2O_2为复合吸收液时,NO脱除率达95%,NO被吸收后的产物为硝酸根和亚硝酸根离子,成分简单,经简单处理可制成工业原料,直接回收利用。

The article is to discuss the removal of NO from the simulated exhaust gas waste by using a rotating packed bed（ RPB） through a kind of advanced highly efficient gas-liquid mass transfer equipment. For the study purpose,we have managed to put the pre-mixed simulated flue gas NO,O2 and N2 into a highly gravitational rotating packed bed contacted fully in the opposite directions,with the simulated flue gas and absorbed liquid in a rotating packed bed. When the reaction is finished over,the absorption liquid would flow out from the said bed from the bottom of the liquid,and moved into an absorption bottle which can be used repeatedly in a circular manner. And,then,the flue gas residual would be let out through a gas absorption device as a kind of air exhaust. Furthermore,we have made an investigation of the removal efficiency of the low concentration NO via the high gravity rotating packed bed. In the above mentioned experiments,we have adopted the sodium hydroxide solution,hydrogen peroxide solution and the complex mixed solution as the absorption componential liquids. And,in turn,we have also investigated and tested the effects of their rotating speeds,the gas-liquid ratio on the characteristic features of the gravity rotating packed bed.At the same time,we have made an exploration of the effects of the different kinds of absorption liquids,their concentration,reaction time and products on the NO removal efficiency,too. The results of our study indicate that the gravity rotating speed of the packed bed turns out to be 900 r/min,whereas the gas-liquid ratio is 5： 1,with the best NO removal efficiency being 38%,and34% when the sodium hydroxide and hydrogen peroxide are as the absorption liquid agents,respectively. What is more,the NO removal efficiency has also been found being able to reach 95%when 0. 03 mol/L sodium hydroxide and 0. 4 mol/L hydrogen peroxide are used as the compound adsorption liquids. Since the composition of the components of the participants of the experiment is simple and the procedure is concise,it is possible for the different kinds of absorption liquids to be made conveniently into the industrial raw materials through simple processing and direct recycling.