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Study on removing marine multiple pollutants in raw exhaust gas with a novel composited method combined with pre-agglomeration and wet scrubbing technology

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Abstract

Most of the existing oxidation denitrification methods need longer residence time to obtain higher NOx removal efficiency. In this study, urea peroxide (CO(NH2)2·H2O2) was first used for removing SO2 and NOx on diesel engine bench. The addition of ferrous sulfate can enhance the oxidant capacity of the solution. The better removal efficiency and lower nitrate content in liquid can be achieved in short exhaust gas residence time. The raw gas flow and residence time contained the actual application situation in ships and have high reference value. The removal efficiency decreased with the increase of gas flow, and the reaction temperature, urea peroxide concentration, liquid–gas ratio were the main factors. The optimal Fe2+ concentration of 50 mmol/L and pH value of 4 were determined. The urea peroxide concentration, reaction temperature, and liquid–gas ratio were 9%, 70 ℃, and 10 L/m3 respectively. The maximum gas treatment capacity was about 100 L/min, and residence time was close to 10 s for the scrubber. The pre-agglomerating method were used to improve the particle capturing efficiency combined with spray technology. The composited method can realize the synchronous and efficient removal of multiple pollutants in a single scrubber. The possibility of application on ship was further increased.

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Data availability

All data generated or analyzed during this study are included in this published article. And the datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

PM:

Particulate matter

NOx:

Nitrogen oxides

SOx:

Sulfur oxides

SCR:

Selective catalytic reduction

EGC:

Exhaust gas cleaning

OC:

Organic carbon

EC:

Elemental carbon

CO:

Carbon monoxide

CO2 :

Carbon dioxide

HFO:

Heavy fuel oil

FSC:

Fuel sulfur content

IMO:

International Maritime Organization

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Acknowledgements

We gratefully acknowledge the financial support of WUST Research Fund (KJRC2022010).

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Authors and Affiliations

  1. School of Intelligent Manufacturing, Weifang University of Science and Technology, Weifang, 262700, People’s Republic of China

    **xi Zhou & Guoxian Jiang

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  1. **xi Zhou
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  2. Guoxian Jiang
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Contributions

**xi Zhou: resources, supervision, project administration, methodology, investigation, writing-review and editing, funding acquisition, investigation, data curation, visualization. Guoxian Jiang: resources, supervision.

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Correspondence to **xi Zhou.

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Zhou, J., Jiang, G. Study on removing marine multiple pollutants in raw exhaust gas with a novel composited method combined with pre-agglomeration and wet scrubbing technology. Environ Sci Pollut Res 30, 47262–47273 (2023). https://doi.org/10.1007/s11356-023-25660-y

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