Study On Purification Of Nitrogen Oxides By Low Temperature Plasma And Micron Wood Fiber Filter

With the advancement of science and technology and the development of industry,the problem of environmental pollution has become more and more serious.Among them,the problem of air pollution is particularly prominent.With the increasingly stringent regulations on emission regulations,it has become a top priority to control motor vehicle exhaust emissions.Compared with the traditional exhaust gas purification technology,the low temperature plasma tail gas technology has greater research and development potential and development prospects.In this paper,the related research on the purification of nitrogen oxides by low-temperature plasma and micro-wood fiber filter is carried out by using laboratory simulated diesel exhaust.There are two main aspects:First,design a test device.Firstly,the box gas mixer was designed.The feasibility was verified by numerical calculation before production.Secondly,through the study of the microstructure of wood,the micro-wood fiber filter was designed and fabricated.Then,by comparing the plasma generation method,it is proposed to use dielectric barrier discharge as the generation mode of the low-temperature plasma purification device,and design and manufacture a low-temperature plasma purification device.Secondly,the laboratory simulated diesel exhaust gas test bench was built to investigate the effect of initial NO concentration on NO removal rate under N2+NO system,the effect of volume fraction on NO removal rate under N2+NO+O2 system,and the effect of discharge voltage on NO removal rate.The effect of gas flow rate on NO removal rate and the effect of electrode diameter on NO removal rate.Studies have shown that increasing the initial concentration of NO is not conducive to the removal of NO.Increasing the volume fraction of O2 is not conducive to the removal of NO.The removal rate of NO increases with the increase of discharge voltage in a certain voltage range.When the gas flow rate is greater than a certain value,the NO removal rate decreases as the gas flow rate increases,and the NO removal rate increases as the electrode diameter increases.