Journal of the Japan Institute of Energy
Online ISSN : 1882-6121
Print ISSN : 0916-8753
ISSN-L : 0916-8753
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Volume 83, Issue 5
Displaying 1-2 of 2 articles from this issue
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  • Pseudo Component Lumping of Softening Coal Based on High-temperature NMR
    Kunio MIYAZAWA, Kenshi NODA, Shozo ITAGAKI, Izumi SHIMOYAMA, Tadatoshi ...
    2004 Volume 83 Issue 5 Pages 354-359
    Published: May 20, 2004
    Released on J-STAGE: July 01, 2011
    DOIhttps://doi.org/10.3775/jie.83.354
    JOURNAL FREE ACCESS
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    High-temperature NMR (Proton magnetic resonance thermal analysis) was applied to study the fluidity of slightly-caking coals and coking coals. A pseudo component lumping analysis was made analyzing the free induction decays of these coals into three components, i.e., a rigid component, an intermediate compo-nent and a mobile component. The amount of the mobile component correlates the maximum fluidity (MF) obtained by the Gieseler plastmeter between MF=100-3000ddpm. It was found that the characterization using the amount of the mobile component is more useful than that using the maximum fluidity for several coals having small MF(MF<-20). It was also suggested that the intermediate component corresponds to a new component caused by the interaction of the mobile component with the rigid component in coal.
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  • Defluorination Characteristics of Coalbriquette with Ca (OH) 2 during Coal Combustion
    Dan Liu, Masayoshi SADAKATA
    2004 Volume 83 Issue 5 Pages 360-366
    Published: May 20, 2004
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.83.360
    JOURNAL FREE ACCESS
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    Research on the control of fluoride emissions from coal combustion is necessary to solve a serious fluoride pollution problem. In this work, CaCO3 and Ca (OH) 2 were used as defluorination agents to decrease fluoride emissions during coal combustion. When the molar equivalency of Ca to F2+S equaled 1.8, the resulting defluorination efficiency of Ca (OH) 2 was 50% and deSO2 efficiency was 63% at 900°C. Experimental results showed that defluorination efficiency increased with increasing fuel ratio of coals or decreasing temperature.
    White-coal, made by coating the surface of a coal briquette with a thin layer of Ca (OH) 2, was tested as a new solid fuel. The result shows that the white-coal emits less fluorides and SO2 in both volatile content combustion and char combustion.
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