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Related Experiment Videos

Mercury emissions from coal combustion.

C E Billings, W R Matson

    Science (New York, N.Y.)
    |June 16, 1972
    PubMed
    Summary
    This summary is machine-generated.

    Coal combustion releases mercury, primarily as vapor (90%) with some in ash (10%). A large coal-fired power plant can emit 2.5 kg of mercury daily.

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    Area of Science:

    • Environmental Science
    • Chemical Engineering
    • Combustion Science

    Background:

    • Coal combustion is a significant source of mercury emissions.
    • Understanding mercury speciation (vapor vs. ash) is crucial for emission control.

    Purpose of the Study:

    • To quantify the phase distribution of mercury released during pulverized coal combustion.
    • To estimate daily mercury release from a large-scale coal-fired power unit.

    Main Methods:

    • Analysis of flue gas and furnace ash composition.
    • Mass balance calculations based on coal input and combustion products.

    Main Results:

    • Approximately 90% of released mercury is in the vapor phase.
    • About 10% of released mercury is retained in the furnace ash.

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  • A 700-megawatt unit releases approximately 2.5 kilograms of mercury per day.

    • Conclusions:

    • The majority of mercury from pulverized coal combustion is emitted as vapor.
    • Effective mercury control strategies must target vapor-phase emissions.
    • Quantification of daily mercury release is essential for regulatory compliance and environmental impact assessment.