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Related Experiment Videos

PAH emission from the industrial boilers.

C Li1, H Mi, W Lee

  • 1Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.

Journal of Hazardous Materials
|September 30, 1999
PubMed
Summary

Industrial boilers burning heavy oil emit significantly higher levels of polycyclic aromatic hydrocarbons (PAHs) than those using diesel or natural gas. Naphthalene was the most common PAH detected in flue gas emissions.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Industrial Emissions

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are a group of organic compounds formed during incomplete combustion processes.
  • Industrial boilers are significant sources of atmospheric pollutants, including PAHs.
  • Understanding PAH emissions is crucial for assessing environmental and health impacts.

Purpose of the Study:

  • To investigate and quantify polycyclic aromatic hydrocarbon (PAH) emissions from various industrial boilers.
  • To compare PAH emission factors across different fuel types: heavy oil, diesel, and co-combustion mixtures.
  • To identify dominant PAH compounds and their molecular weight distribution in flue gas.

Main Methods:

  • Sampling of flue gas (gas and particle phases) from 25 industrial boilers using a dedicated PAH stack sampling system.

Related Experiment Videos

  • Analysis of 21 individual PAHs using gas chromatography/mass spectrometry (GC/MS).
  • Calculation of total-PAH concentration and emission factors (EFs) for different fuel types.

    • Main Results:

    • Total-PAH concentrations ranged from 29.0 to 4250 µg/m³, with an average of 488 µg/m³.
    • Lower molecular weight PAHs (2-ring) constituted the largest proportion (54.7%) of total PAHs.
    • Heavy oil-fueled boilers exhibited the highest total-PAH emission factors (13,300 µg/kg-fuel), one order of magnitude greater than diesel-fueled boilers.

    Conclusions:

    • Heavy oil combustion in industrial boilers is a major source of PAH emissions, with naphthalene being the most prevalent.
    • Emission factors vary significantly based on fuel type, highlighting the need for fuel-specific emission control strategies.
    • The study provides critical data for environmental risk assessment and regulatory development concerning industrial PAH emissions.