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Experimental study on the emission characteristics of a non-road diesel engine equipped with different after-treatment devices

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Abstract

A comparative experiment was conducted based on a non-road diesel engine to investigate the effects of two after-treatment devices on the engine’s emission characteristics as well as their power and fuel consumption performances. The first after-treatment device is a combination of a diesel oxidation catalyst (DOC) and a catalytic diesel particulate filter (CDPF). The second device is a single CDPF-coated improved noble metal catalyst. Results showed that the two after-treatment devices had almost no effect on the power and fuel consumption performance. The gaseous and particulate emissions of the engine depended on the operation conditions including the speed and load. However, the dual DOC+CDPF system and the single CDPF reduced more than 81% of the carbon monoxide (CO) and 73% of the hydrocarbon (HC) emissions. Notably, the reduction efficiency by the single CDPF was higher than that of the DOC+CDPF system. In terms of the particulate emissions, both after-treatment devices achieved more than 96% reduction of the particle number (PN) and up to 88% reduction of the particulate mass (PM). Similarly, the single CDPF outperformed the dual DOC+CDPF system in reducing particle emissions. Although no changes occurred in the bimodal particle size distribution of the engine after the installation of the two after-treatment devices, they performed differently in reducing particles with different sizes. The particles reduction efficiency of the DOC+CDPF system was higher than that of the single CDPF for the particles smaller than 14.3 nm, and this trend converted for particles larger than 14.3 nm. Improving the noble metal catalyst load in the CDPF ensured a performance that rivaled the DOC+CDPF system. Apart from the NOx emissions, the installation of a single CDPF with an improved noble metal catalyst load can make the non-road diesel engine meet the limits of the China IV emission regulations.

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Funding

This study was supported by the National Key Research and Development Program of China (2017YFC0211300), and Research Projects of Shanghai Committee of Science and Technology (16DZ1203001, 18DZ1202900). This work was also partially supported by the China Scholarship Council (no. 201806260133).

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Authors and Affiliations

  1. School of Automotive Studies, Tongji University, Shanghai, 201804, China

    Yunhua Zhang, Diming Lou, Piqiang Tan & Zhiyuan Hu

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  1. Yunhua Zhang
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  2. Diming Lou
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  3. Piqiang Tan
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  4. Zhiyuan Hu
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Correspondence to Diming Lou.

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Zhang, Y., Lou, D., Tan, P. et al. Experimental study on the emission characteristics of a non-road diesel engine equipped with different after-treatment devices. Environ Sci Pollut Res 26, 26617–26627 (2019). https://doi.org/10.1007/s11356-019-05839-y

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  • DOI: https://doi.org/10.1007/s11356-019-05839-y

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