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In-depth characterization of exhaust particles performed on-board a modern cruise ship applying a scrubber

  • 0Aerosol Physics Laboratory, Physics Unit, Faculty of Engineering and Natural Sciences, University, Korkeakoulunkatu 3, 33720 Tampere, Finland; Transport Emission Control, VTT Technical Research Centre of Finland Oy, Tietotie 4C, 02150 Espoo, Finland.
The Science of the Total Environment +

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June 26, 2024

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June 26, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Marine scrubbers reduce exhaust particle numbers and PAH compounds, but larger particles like black carbon remain. This impacts emission inventories and air quality models.

Area Of Science

  • Marine engineering
  • Environmental science
  • Atmospheric chemistry

Background

  • Ship emissions are regulated by environmental laws.
  • After-treatment devices like scrubbers and SCR impact exhaust particles.
  • Understanding these impacts is crucial for emission inventories and models.

Purpose Of The Study

  • To comprehensively characterize marine exhaust aerosol particles upstream and downstream a hybrid scrubber.
  • To assess the impact of scrubbers and SCR on particle properties and number size distribution.
  • To evaluate the influence of fuel type (HFO, MGO) and engine load on particle characteristics.

Main Methods

  • Transmission electron microscopy (TEM) for particle characterization.
  • Analysis of exhaust aerosol particles upstream and downstream a hybrid scrubber on a cruise ship.
  • Testing under different engine load conditions (75%, 40%) and fuel types (HFO, MGO).

Main Results

  • At least 4 particle types were identified upstream and downstream the scrubber.
  • Scrubber and SCR affected particle number size distribution (PSD), increasing geometric mean diameter (GMD).
  • Scrubbers reduced particle number (PN) and non-volatile particles, but less effectively for particles >50 nm (BC, metal-containing particles).
  • PAH compound concentrations were also reduced by the scrubber.

Conclusions

  • Hybrid scrubbers effectively reduce certain exhaust particle numbers and PAH concentrations.
  • The effectiveness of scrubbers varies with particle size, with limited impact on larger black carbon and metal-containing particles.
  • Findings are valuable for refining ship emission inventories and climate/air quality models.

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