Theoretical And Experimental Research On Microwood Powder Exhaust Filtration Of Automotive Activated Fine Wire Skeleton

With the rapid development of China's economy,the number of motor vehicles keeps increasing.At the same time,the pollution of exhaust emissions to the environment is also continuing to deepen,resulting in haze weather,traffic safety and human health.PM2.5 is small in size,light in weight,and has a long residence time in the atmosphere,causing a wide range of air pollution.Therefore,exhaust gas purification technology is currently the focus of research.Based on the concept of activated fine wood wire proposed by Prof.Ma Yan,a carpenter wire filter is used to treat or purify exhaust gas post-treatment devices that are toxic and hazardous substances in the exhaust gas.This paper mainly uses theoretical research,numerical simulation analysis and experimental research to carry on the detection and the research to the automobile activation fine wire skeleton micron wood flour filter's each index of performance to carry on the examination and the research.Through the theoretical study of the microstructure of activated fine wood,a mathematical model for the filtration process of activated fine wood filter was established.Considering the model boundary conditions and the trapping effect,the model is described and hypothesized using the inertial cut-off efficiency of a single fine wood.At the same time,considering the influence of multiple fine silks on the filtration efficiency,the formula for filter filtration efficiency is obtained and calculated.Using the Fluent software in CFD,the mesh of the fine wood filter was divided and the corresponding boundary conditions were set.From the theoretical perspective,the distribution of pressure,velocity,etc.in the filtration process was analyzed.According to the laboratory's existing equipment and equipment,combined with China's national V-phase motor vehicle pollutant discharge standards and other related standards,the performance test bench for the automobile activated fine wire skeleton micron wood powder exhaust gas filter was built.Through the improvement of the original process of preparing fine-filament filter cartridges,the process of molding the fine-filament filter cartridges was developed.By improving the technological process of preparing the filter core of the fine wire filter,the process of the filter core of the mould pressing fine wood filter is worked out,and the test parts of the activated fine wood filter filter core with the specification of 120 x 30mm and the amount of mixing glue are 4:1.The filter core was tested by the built test bench.The feasibility of filtering the tail gas by the filter element is verified,and the filtration efficiency of the filter element is calculated.At the same time,pressure drop characteristics and fatigue life performance tests are carried out to verify the feasibility of this mathematical model.The results show that the trapping effect and the inertia filter effect of fine wood wire play a leading role in the entire exhaust gas filtration process.The exhaust gas volume and exhaust temperature have little effect on the trapping effect.Only when the core diameter decreases,the filtration efficiency of fine wood filter is increased.The filter efficiency is the best when the filter element in the filter is in a certain amount.This paper focuses on the mechanism of filtration,fine wood filter filtration efficiency,pressure drop characteristics and life performance.The performance test platform is built,and the correctness of the mathematical model and theoretical analysis is verified.For the future development of high-efficiency filters has laid a solid theoretical basis and experimental research basis.