title: Effects of continuously regenerating diesel particulate filters on regulated emissions and number-size distribution of particles emitted from a diesel engine.
abstract: The effects of continuously regenerating diesel particulate filter (CRDPF) systems on regulated gaseous emissions, and number-size distribution and mass of particles emanated from a diesel engine have been investigated in this study. Two CRDPF units (CRDPF-1 and CRDPF-2) with different specifications were separately retrofitted to the engine running with European steady-state cycle (ESC). An electrical low pressure impactor (ELPI) was used for particle number-size distribution measurement and mass estimation. The conversion/reduction rate (R(CR)) of hydrocarbons (HC) and carbon monoxide (CO) across CRDPF-1 was 83% and 96.3%, respectively. Similarly, the R(CR) of HC and CO and across CRDPF-2 was 91.8% and 99.1%, respectively. The number concentration of particles and their concentration peaks; nuclei mode, accumulation mode and total particles; and particle mass were highly reduced with the CRDPF units. The nuclei mode particles at downstream of CRDPF-1 and CRDPF-2 decreased by 99.9% to 100% and 97.8% to 99.8% respectively; and the particle mass reduced by 73% to 92.2% and 35.3% to 72.4%, respectively, depending on the engine conditions. In addition, nuclei mode particles increased with the increasing of engine speed due to the heterogeneous nucleation initiated by the higher exhaust temperature, while accumulation mode particles were higher at higher loads due to the decrease in the air-to-fuel ratio (A/F) at higher loads.
authors.affiliation: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China. liuzhihua161@163.com
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Liu
authors.forename: Asad Naeem
authors.initials: AN
authors.lastname: Shah
authors.forename: Yunshan
authors.initials: Y
authors.lastname: Ge
authors.forename: Yan
authors.initials: Y
authors.lastname: Ding
authors.forename: Jianwei
authors.initials: J
authors.lastname: Tan
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
authors.forename: Linxiao
authors.initials: L
authors.lastname: Yu
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Chu
authors.initials: C
authors.lastname: Wang
authors.forename: Tao
authors.initials: T
authors.lastname: Zeng
mesh_terms: D000388:Air; D000393:Air Pollutants / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D005060:Europe; D005374:Filtration / Q000295:instrumentation*; D005742:Gasoline / Q000032:analysis*; D006838:Hydrocarbons / Q000032:analysis; D008970:Molecular Weight; D018986:Motor Vehicles; D009566:Nitrates / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000737:chemistry*; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D005742:Gasoline; D006838:Hydrocarbons; D009566:Nitrates; D052638:Particulate Matter; D001335:Vehicle Emissions; D002245:Carbon Dioxide; D002248:Carbon Monoxide