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[摘要]：Super-fine pulverized coal combustion is a new pulverized coal combustion technology that has better combustion stability, higher combustion efficiency, lower NOx and SO2 emissions, and higher comprehensive efficiency, than using conventional particle sizes. In this paper, we combined the pore surface fractal dimensions and pore structure fractal dimensions based on different methods to analyze the fractal characteristics of super fine pulverized coal particles. And the gray relational analysis was used for further study on the influencing factors of the fractal dimensions. Besides, the discrepancy between the two fractal dimensions influencing the phases during the coal combustion process was also discussed. It is found that all the fractal dimensions of the super tine pulverized coal particles range from 2.36 to 2.91, which belong to the interval 2 < D < 3. It is interesting to observe that the surface fractal dimension increases with the increase of the pulverized coal particle size while the structure fractal dimension increases with the decrease of the average pore diameters. In addition, we compared the N-2 gas adsorption isotherms, pore size distribution, and small-angle X-ray scattering (SAXS) curves together and found that they actually associated with each other, which can be combined to confirm the appropriate range to obtain the fractal dimensions precisely. Finally, after analysis of both pore surface fractal dimensions and structure fractal dimensions, we can draw the conclusion that the super-fine pulverized coal particles are advantageous for coal combustion process. |
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