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 |
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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. |
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ISSN: | 0016-2361 1873-7153 |
DOI: | 10.1016/0016-2361(86)90138-9 |