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Journal of the Japan Institute of Energy Vol. 83 (2004), No. 5

ISIJ International
belloff
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753
Publisher: The Japan Institute of Energy

Backnumber

  1. Vol. 103 (2024)

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  30. Vol. 74 (1995)

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  31. Vol. 73 (1994)

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  32. Vol. 72 (1993)

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Journal of the Japan Institute of Energy Vol. 83 (2004), No. 5

Pseudo Component Lumping of Softening Coal Based on High-temperature NMR

Kunio MIYAZAWA, Kenshi NODA, Shozo ITAGAKI, Izumi SHIMOYAMA, Tadatoshi CHIBA, Richard SAKUROVS

pp. 354-359

DOI:

10.3775/jie.83.354

Abstract

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

pp. 360-366

DOI:

10.3775/jie.83.360

Abstract

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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Defluorination Characteristics of Coalbriquette with Ca (OH) 2 during Coal Combustion

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