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Investigation on a high gravity device for reduction of NOx emission from marine diesel engines

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Abstract

High gravity technology, as a process intensification technology, has demonstrated the great advantages in the field of gas purification on account of its excellent mass transfer efficiency and energy-efficient, but it is rarely applied in the field of nitrogen oxides (NOx) purification of marine diesel engine exhaust. In this paper, a high-gravity bowl-shaped-disk rotating bed (HBRB) without catalytic was designed for diesel exhaust after-treatment. A diesel oxidation catalyst (DOC) was installed in the front of the HBRB to regenerate more nitrogen dioxide (NO2) easily reduced by urea. A bench test of a 6-cylinder marine diesel engine with the HBRB was carried out. The effects of the HBRB speeds, urea concentrations, and engine operating conditions on NOx purification efficiency in engine exhaust were experimentally investigated. The experimental result indicates that the maximum NOx removal efficiency of the HBRB can reach 69.1%. The improvement of the NOx removal efficiency is not obvious at the HBRB speed of over 1500 r/min. The pre-oxidation degree of nitric oxide (NO) and urea concentration largely affect the NOx removal efficiency. The HBRB has great potential in marine diesel engine exhaust denitration.

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Acknowledgements

This work was supported by the National Key R&D Program of China and the Postgraduate Research & Practice Innovation Program of Jiangsu Province.

Funding

This work was funded by the National Key R&D Program of China (No. 2017YFE0116100) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_3079).

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Authors and Affiliations

  1. School of Mechanical Engineering, Nantong University, Nantong, 226019, China

    Peiyong Ni, Haiyan Xu, Zhongfei Liu, Ziheng Zhang & Chaohua Peng

  2. School of Electrical Engineering, Nantong University, Nantong, 226019, China

    Xiangli Wang

Authors
  1. Peiyong Ni
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  2. Haiyan Xu
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  3. Zhongfei Liu
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  4. Ziheng Zhang
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  5. Chaohua Peng
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  6. Xiangli Wang
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Contributions

Peiyong Ni and Xiangli Wang developed the idea for the study. Haiyan Xu wrote the first draft of the paper. Zhongfei Liu, Ziheng Zhang, and Chaohua Peng designed the study.

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Correspondence to Xiangli Wang.

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Ni, P., Xu, H., Liu, Z. et al. Investigation on a high gravity device for reduction of NOx emission from marine diesel engines. Environ Sci Pollut Res 29, 64721–64731 (2022). https://doi.org/10.1007/s11356-022-20272-4

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  • DOI: https://doi.org/10.1007/s11356-022-20272-4

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