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The structure of coal char was investigated based on elemental composition of char. Char used in this study were prepared at 800°C from four demineralized Argonne Premium Coals. Elemental analysis was made using the conventional ultimate analysis method, and hydrogen content was determined by the temperature programmed oxidation method. This method is more reliable for hydrogen analysis than the conventional...
A mechanistic approach has been used for assessing the ash deposition tendency and has been used for predicting the ash deposition behavior of Australian bituminous coals in a pilot-scale test furnace. The detailed analysis of mineral matter in coal determined by QemSCAN analytical technique was incorporated into an ash formation model to estimate the character of ash particles. The detailed chemical...
In this study, deposition experiments with well characterized samples of Australian black coals and blends were conducted in a laminar drop-tube furnace to assess the blends behavior and their potential to form ash deposits. Comparison of the results between the blends and single coals shows that the blends behavior was not additive in nature. Some blends developed a thicker ash deposit layer with...
The structural transformations in Beulah-Zap (BZ), Illinois (IL) no. 6, Upper Freeport (UF) and Pocahontas (POC) no. 3 coals on heat-treatment at 427, 800 and 1200 o C were examined by high-resolution transmission electron microscopy (HRTEM) technique. The stacking number and layer sizes of heat-treated coals were evaluated. The structural change in coal strongly depends on whether a coal...
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