Effects of continuously regenerating diesel particulate filters on regulated
emissions and number-size distribution of particles emitted
from a diesel engine |
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Authors: | Zhihua Liu Asad Naeem Shah Yunshan Ge Yan Ding Jianwei Tan Lei Jiang Linxiao Yu Wei Zhao Chu Wang and Tao Zeng |
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Institution: | 1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;Bourns College of Engineering, Center for Environmental Research and Technology, and Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92507, USA 2. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;Department of Mechanical Engineering, University of Engineering and Technology, Lahore 54000, Pakistan 3. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China 4. Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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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 di erent 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 (RCR) of hydrocarbons (HC) and carbon monoxide (CO) across CRDPF-1 was 83% and 96.3%, respectively.
Similarly, the RCR 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. |
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Keywords: | diesel engine regulated emissions particulate matter number-size distribution continuously regenerating diesel
particulate filter |
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