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http://dx.doi.org/10.9713/kcer.2013.51.5.609

Surface Characteristics and Spontaneous Combustibility of Coal Treated with Non-polar Solvent under Room Temperature  

Jo, Wan Taek (Clean Fuel Department, Korea Institute of Energy Research)
Choi, Ho Kyung (Clean Fuel Department, Korea Institute of Energy Research)
Kim, Sang Do (Clean Fuel Department, Korea Institute of Energy Research)
Yoo, Ji Ho (Clean Fuel Department, Korea Institute of Energy Research)
Chun, Dong Hyuk (Clean Fuel Department, Korea Institute of Energy Research)
Rhim, Young Joon (Clean Fuel Department, Korea Institute of Energy Research)
Lim, Jeong Hwan (Clean Fuel Department, Korea Institute of Energy Research)
Lee, Si Hyun (Clean Fuel Department, Korea Institute of Energy Research)
Publication Information
Korean Chemical Engineering Research / v.51, no.5, 2013 , pp. 609-614 More about this Journal
Abstract
This study investigated the spontaneous combustion behavior of solvent-treated low rank coals. Indonesian lignite (a KBB and SM coal) and sub-bituminous (a Roto coal) were mixed with non-polar 1-methyl naphthalene (1MN) either by mechanical agitation or ultrasonication. The property change associated with 1MN treatment was then analyzed using proximate analysis, calorific value analysis, Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy and moisture re-adsorption test. Susceptibility to spontaneous combustion was evaluated using crossingpoint temperature (CPT) measurement along with gas analysis by GC. A FT-IR profile showed that oxygen functional groups and C-H bonding became weaker when treated by 1 MN. XPS results also indicated a decrease of the oxygen groups (C-O-, C=O and COO-). Increased hydrophobicity was found in the 1MN treated coals during moisture readsorption test. A CPT of the treated coals was ${\sim}20^{\circ}C$ higher than that of the corresponding raw coals and the ultrasonication was more effective way to enhance the stability against spontaneous combustion than the agitation. In the gas analysis less CO and $CO_2$ were emitted from 1MN treated coals, also indicating inhibition of pyrophoric behavior. The surface functional groups participating in the oxidation reaction seemed to be removed by the ultrasonication more effectively than by the simple mechanical agitation.
Keywords
Low Rank Coal; 1-methyl naphthalene; Ultrasonic; Oxidation; Crossing-point Temperature;
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Times Cited By KSCI : 2  (Citation Analysis)
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