便携式检测仪研究介质阻挡放电降解正丙醇废气

为快速探索不同参数下介质阻挡放电降解正丙醇的规律,搭建了废气处理实验装置,采用便携式VOC和CO检测仪对介质阻挡放电处理的正丙醇废气进行了快速定性检测,实验结果表明:便携式检测仪能够快速实时的响应出结果,放电功率、气体流量、初始浓度对正丙醇降解率有重大影响。随着放电功率的增加,处理后的正丙醇气体浓度逐渐下降,CO浓度逐渐上升,表明正丙醇降解率不断提高;随着气体流量增加,处理后正丙醇先迅速变大然后稳定,CO浓度逐渐下降,表明正丙醇降解率明显下降;随着正丙醇浓度的增加,处理后正丙醇浓度与处理前浓度成正比,CO浓度与VOC检测比值迅速变小后稳定,表明正丙醇降解率迅速下降。     

Characteristics of water volatilization and oxides generation by using positive and negative corona

The physical and chemical properties have significant differences for the positive and negative charged particles generated by discharge. In this work, a positive and negative corona discharge system was established, and two discharge reactors for charged particles restraining and acting were designed by a needle electrode covered with a quartz tube and a plate electrode filled with water. The corona discharges happened within the needle-plate electrodes were excited by a positive and negative high voltage source, and the characteristics of both water volatilization and oxides generation were examined within influence of the distances of both quartz tube inside and outside. The results show that the characteristics of both the water volatilization and oxides generation can be affected by the distances of both quartz tube inside and outside. When the distances of tube inside were increased from 5.00 to 13.00 mm, the water volatilizations decreased under negative corona, and increased firstly and declined immediately under positive corona. The maximum value of the water volatilization appeared in the distances of tube inside with 6.00–8.00 mm. In addition, the concentrations of the HNOx and H2O2 in treated water decreased with increasing the distances of tube inside. Moreover, with increasing the distances of tube outside from 4.00 to 14.00 mm, the change trends of both the water volatilizations and oxides presented the same as the distances of tube inside, and the maximum value of the water volatilization and oxides appeared in the distance of tube outside with about 9.00 mm. Overall, the positive corona can generate more water volatilizations and oxides in water than negative corona, and non H2O2 can be produced by negative corona. The results reflect the difference between positive and negative corona interaction with water, which can provide reference for plasma application.