Effects of different EHC on times on gaseous, particulate pollutants and energy consumption of PNA + DOC + SDPF system under low temperature and WHTC conditions

Lulu Kang, Diming Lou, Yunhua Zhang, Liang Fang, Zhiguo Zhao, Piqiang Tan, Zhiyuan Hu, Yunkun Zhao and Sumin Hong

Applied Energy, 2024, vol. 373, issue C, No S0306261924012728

Abstract: The catalytic efficiency of diesel oxidation catalytic (DOC) and selective catalytic reduction catalyst coated on diesel particulate filter (SDPF) is restricted by the catalyst light off temperature window, and reducing gaseous pollutants under low-temperature conditions is a current challenge. This paper used passive nitrogen oxide adsorption catalytic converter (PNA) and electric heating catalytic converter (EHC) technology to improve the catalytic efficiency of DOC and SDPF under low temperature conditions and studied impact of multiple EHC on times on the capability of PNA + DOC+SDPF system. The results indicate that EHC can quickly rise the temperature to the catalyst ignition threshold. In the meantime, PNA can efficiently adsorb gaseous pollutants and provide a buffer time for the heating delay period of EHC. Under low temperature conditions, the rise rate of DOC and SDPF temperature, the SDPF pressure difference, and energy consumption all raise with the advance of EHC on time. The comprehensive performance indicates that EHC on 30 s in advance is a more favorable strategy. When EHC on 30 s in advance and assisted by PNA, the conversion efficiency of CO, THC, and NOx was 99.9%, 96.0%, and 90.1%, respectively. The AdBlue injection was advanced by 24 s, without NH3 slip, and energy consumption was 0.71 kWh. Under the WHTC operating condition, the time for DOC and SDPF temperatures to reach the light off temperature was shortened by 383 s and 320 s, respectively. The conversion efficiency of CO, THC, NOx, and PN is 98.4%, 98.6%, 92.3%, and 99%, respectively, which are far below the China VIb threshold. The transient emission reduction performance of this new technology route provides important support for future ultra-low emission technology routes.

Keywords: EHC on times; Gaseous pollutants; Energy consumption; Light off temperature; Conversion efficiency; Transient performance (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.123889

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