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최호경,Wantaek Jo,김상도,유지호,전동혁,Young-joon Rhim,Jeong-HwanLim,Si Hyun Lee 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
We compared the susceptibility to spontaneous combustion of low-rank coals dried by four different pro-cesses: flash drying, fluidized bed drying, non-fried carbon briquetting, and coal-oil slurry dewatering. The coals werecharacterized by FT-IR and XPS analysis. A crossing-point temperature (CPT) was estimated as a comparison criterionof the susceptibility of the coals to spontaneous combustion. O2, CO, and CO2 emissions during the CPT measurementwere also compared. The FT-IR and XPS analysis revealed that some of the oxygen functional groups on the surfaceof the coal were removed when the coal underwent the drying process. This phenomenon was particularly noticeablein the coal dried by oil. Accordingly, the CPT of the coal that went through this drying process was high. Among thesamples, the coals dried by oil showed the highest CPT.
Characteristics of coal upgraded with heavy oils
Eun Mi Jo,전동혁,In Su Park,김상도,Young-joon Rhim,Ho Kyung Choi,유지호,Jeong-HwanLim,Si Hyun Lee 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
We investigated the ability of an oil coating to upgrade Indonesian low-rank coal, which has a low ashcontent and a moisture content of approximately 30%. Proximate and ultimate analyses of the characteristics of coalsamples containing different amounts of asphalt (ASP) and palm fatty acid distillate (PFAD) were studied, includingthe samples’ calorific values, crossing-point temperatures (CPT), specific surface areas, pore sizes, structural changes,and moisture readsorption. The results showed that the 0.5% PFAD-coated coal was the highest quality. This coal showedfew physical and chemical changes, and it had a low surface area and a high CPT value.