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Effect of cavitation on removal of alkali elements from coal
H. Srivalli, L. Nirmal,
Published in Institute of Physics Publishing
2015
Volume: 656
   
Issue: 1
Abstract
The main impurities in coal are sulphur, ash and alkali. On combustion, the volatile forms of these impurities are either condensed on the boilers, or emitted in the form of potentially hazardous gases. The alkali elements present in coal help the fly ash particles adhere to boiler surfaces by providing a wet surface on which collection of these particles can take place. Use of ultrasonic techniques in cleaning of coal has stirred interest among researchers in recent times. Extraction of alkali elements by cavitation effect using low-frequency ultrasound, in the presence of reagents (HNO3 and H2O2) is reported in this paper. Powdered coal was dissolved with the reagent and exposed to ultrasonic fields of various frequencies at different time intervals. The treated solution is filtered and tested for alkali levels.
About the journal
JournalJournal of Physics: Conference Series
PublisherInstitute of Physics Publishing
ISSN17426588
Open AccessYes
Concepts (14)
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    Boilers
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    Cavitation
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    Coal
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    Fly ash
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    Ultrasonic testing
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    ALKALI ELEMENTS
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    CAVITATION EFFECT
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    Impurities in
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    LOW-FREQUENCY ULTRASOUND
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    POWDERED COAL
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    Time interval
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    ULTRASONIC FIELD
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    ULTRASONIC TECHNIQUES
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    Coal combustion