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Size effects on the thermal behavior of superfine pulverized coal ash

机译：尺寸对超细粉煤灰热性能的影响

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The coal ash fusibility is an important parameter that affects the boiler design and operation significantly. Superfine pulverized coal is beneficial to the alleviation of fouling and slagging problems due to its distinctive properties in the aspects of multiphase flow, heat transfer and combustion atmosphere. In this work, the size related ash fusion propensity were emphasized from the point of view of the chemical and mineralogical morphology of coal ash. A comprehensive study on the chemistry and thermal behavior of superfine pulverized coal ash was conducted combining multiple analytical methods such as XRF (X-ray fluorescence), XRD (X-ray diffraction), TGA (thermo-gravimetric analysis), slagging indices, AFT (ash fusion temperatures) tests and phase diagrams. Besides, a quantitative analysis method was proposed to eliminate the subjective judgments in AFT tests through a numerical image-processing platform, which could depict a complete deformation profile of the whole ash fusion process with high precision and reproducibility. The results from this work are helpful for understanding the size dependence of ash thermal behavior, and predicting the ash fusion propensity in the future application of superfine pulverized coal. (C) 2016 Elsevier Ltd. All rights
机译：粉煤灰的易熔性是重要影响锅炉设计和运行的重要参数。由于超细粉煤在多相流，传热和燃烧气氛方面的独特性能，因此有利于减轻结垢和结渣问题。在这项工作中，从煤灰的化学和矿物学形态的角度强调了与尺寸有关的灰熔融倾向。结合多种分析方法，如XRF（X射线荧光），XRD（X射线衍射），TGA（热重分析），结渣指数，AFT，对超细粉煤灰的化学和热行为进行了综合研究。 （灰熔融温度）测试和相图。此外，提出了一种定量分析方法，通过一个数字图像处理平台消除了AFT测试中的主观判断，可以精确，可再现地描绘出整个灰熔融过程的完整变形轮廓。这项工作的结果有助于理解灰分热行为的尺寸依赖性，并预测其在超细粉煤的未来应用中的熔合倾向。 （C）2016 Elsevier Ltd.版权所有

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