Impacts of continuously regenerating trap and particle oxidation catalyst on the NO_2 and particulate matter emissions emitted from diesel engine  

作　　者：Zhihua Liu Yunshan Ge Jianwei Tan Chao He Asad Naeem Shah Yan Ding LinxiaoYu Wei Zhao 

机构地区：[1]National Lab of Auto Performance and Emission Test,School of Mechanical and Vehicular Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Department of Mechanical Engineering,University of Engineering and Technology,Lahore 54000,Pakistan [3]Chinese Research Academy of Environmental Sciences,Beijing 100012,China

出　　处：《Journal of Environmental Sciences》2012年第4期624-631,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 50876013)

摘　　要：Two continuously regenerating diesel particulate filter （CRDPF） with different configurations and one particles oxidation catalyst （POC） were employed to perform experiments in a controlled laboratory setting to evaluate their effects on NO2, smoke and particle number emissions. The results showed that the application of the after-treatments increased the emission ratios of NO2/NOx significantly. The results of smoke emissions and particle number （PN） emissions indicated that both CRDPFs had sufficient capacity to remove more than 90% of total particulate matter （PM） and more than 97% of solid particles. However, the POC was able to remove the organic components of total PM, and only partially to remove the carbonaceous particles with size less than 30 nm. The negligible effects of POC on larger particles were observed due to its honeycomb structure leads to an inadequate residence time to oxidize the solid particles or trap them. The particles removal efficiencies of CRDPFs had high degree of correlations with the emission ratio of NO2/NOx. The PN emission results from two CRDPFs indicated that more NO2 generating in diesel oxidation catalyst section could obtain the higher removal efficiency of solid particles. However this also increased the risk of NO2 exposure in atmosphere.Two continuously regenerating diesel particulate filter （CRDPF） with different configurations and one particles oxidation catalyst （POC） were employed to perform experiments in a controlled laboratory setting to evaluate their effects on NO2, smoke and particle number emissions. The results showed that the application of the after-treatments increased the emission ratios of NO2/NOx significantly. The results of smoke emissions and particle number （PN） emissions indicated that both CRDPFs had sufficient capacity to remove more than 90% of total particulate matter （PM） and more than 97% of solid particles. However, the POC was able to remove the organic components of total PM, and only partially to remove the carbonaceous particles with size less than 30 nm. The negligible effects of POC on larger particles were observed due to its honeycomb structure leads to an inadequate residence time to oxidize the solid particles or trap them. The particles removal efficiencies of CRDPFs had high degree of correlations with the emission ratio of NO2/NOx. The PN emission results from two CRDPFs indicated that more NO2 generating in diesel oxidation catalyst section could obtain the higher removal efficiency of solid particles. However this also increased the risk of NO2 exposure in atmosphere.

关 键 词：continuously regenerating diesel particulate filter particles oxidation catalyst particle number diesel engine size distribution 

分 类 号：X511[环境科学与工程—环境工程] TK421.5[动力工程及工程热物理—动力机械及工程]