Consideration on Coal Plasticity by Referring to the Distribution and Structural Properties of Skeletal and Volatile Fractions from Two Different Coals in Both Open and Closed Heat-Treating Systems

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• 作者：Koh Kidena ; Masataka Hiro ; Satoru Murata ; and Masakatsu Nomura
• 刊名：Energy & Fuels
• 出版年：2005
• 出版时间：January 2005
• 年：2005
• 卷：19
• 期：1
• 页码：224 - 229
• 全文大小：187K
• 年卷期：v.19,no.1(January 2005)
• ISSN：1520-5029

文摘

Coal plasticity was investigated using two coals, a strongly coking coal (Goonyella; GNY) anda slightly coking coal (Witbank; WIT) by the heat treatment followed by solvent extraction andthe analyses of the resulting fractions. The two different methods of heat treatment wereemployed: one was heat treatment under nitrogen flow and the other one was heat treatment ina batch container. The heat-treatment followed by pyridine/CS₂ extraction gave volatile, solvent-soluble fraction and solvent-insoluble fraction, the last one corresponding to the skeletal componentduring development of plasticity while the volatile + soluble fraction is believed to act as alubricant against the skeletal component. The elemental analyses, the measurements of FT-IRand solid-state ¹³C NMR spectra, the measurement of swelling index, and the estimation of theamount of transferable hydrogen were conducted for the samples obtained to elucidate how coalplasticity appears and develops. In the open and closed systems, WIT tended to be pyrolyzed atthe early stage of plasticity; however, GNY was pyrolyzed little in the open system and a littlein the closed system, respectively. The amount of transferable hydrogen and swelling index ofsolvent-insoluble fractions (PI) strongly depended on the heat-treatment temperature in the openand closed heat-treating systems, respectively. In the closed system, WIT showed the relativelyhigher swelling index of PI along with fairly small amount of transferable hydrogen while GNYcoal showed lower swelling index and could keep a lot of transferable hydrogen and low-molecular-weight component, which significantly released at the latter stage of plasticity.