Determination of moisture in black coal using pulsed nuclear magnetic resonance spectrometry

Pulsed nuclear magnetic resonance (n.m.r.) spectrometry was investigated as a technique for moisture determination in fine product coal from eight Australian coal washeries. Measurements were made on samples of diameter 8 and 12 mm and length 10 and 120 mm at frequencies from 6.5 to 60 MHz. The rati...

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Veröffentlicht in:Fuel (Guildford) 1986, Vol.65 (1), p.34-39
Hauptverfasser: Cutmore, Nick G., Sowerby, Brian D., Lynch, Leo J., Webster, David S.
Format: Artikel
Sprache:eng
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Zusammenfassung:Pulsed nuclear magnetic resonance (n.m.r.) spectrometry was investigated as a technique for moisture determination in fine product coal from eight Australian coal washeries. Measurements were made on samples of diameter 8 and 12 mm and length 10 and 120 mm at frequencies from 6.5 to 60 MHz. The ratio of intensities of the water and coal components in the free-induction decay signal can be used to determine moisture to within ≈ 0.4–0.7 wt% over the range 0–26 wt% moisture, independent of sample density. This accuracy is independent of particle size (up to 1 mm) and little affected by coal rank, sample length or n.m.r. frequency.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(86)90138-9