Relationship between coal ash composition and ash fusion temperatures
Relationship between coal ash composition and ash fusion temperatures
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DOI：
10.1016/j.fuel.2012.06.046
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发表时间：
2013-03-01
期刊：
影响因子：
7.4
通讯作者：
Hu, Baixing
中科院分区：
文献类型：
--
作者：
Liu, Bo;He, Qihui;Hu, Baixing
灰熔融特性和灰熔融温度是煤炭工业的重要参数。前人的研究已经证明，AFTS与灰样的化学成分密切相关。本文研究了SiO_2-Al_2O_3-CaO-Fe_2O_3-K_2O五元系。在碳气氛中测量了34种合成灰分的AFT，并分析了AFT的变化趋势。与其他研究不同，本文采用X射线衍射仪和扫描电子显微镜相结合的方法，探讨了所测AFTS与灰样矿物组成、形貌和微观结构的关系。此外，还考虑了元素价态的影响，并首次用X射线光电子能谱(XPS)对其进行了分析。结果表明，随着Fe_2O_3含量和硅铝比(S/A)的增加，样品的AFT减小。但是，由于CaO含量的影响，AFTS达到最小值后又增加。此外，随着K2O含量的变化，AFT没有明显的变化。最后，从合成样品中发现的所有结论也适用于国内外收集的17种烟煤灰分。(C)2012爱思唯尔有限公司。保留所有权利。
Coal ash fusion characterization and the ash fusion temperatures (AFTs) are important parameters for coal industry. Previous research has proved that the AFTs are correlated with the chemical composition of coal ash samples. In this paper, a five-component SiO2-Al2O3-CaO-Fe2O3-K2O system is set. The AFTs of 34 synthetic ashes were measured in a carbon atmosphere, and the trends of the AFTs analyzed. Different from other studies, X-ray diffraction (XRD) and scanning electron microscope (SEM) were combined to explore the relationships between the measured AFTs and the mineral composition, morphology and microstructure of ash samples. Furthermore, the effect of the element valence state is also taken into account and X-ray photoelectron spectrometer (XPS) is used to analyze it firstly. The results show that the AFTs decrease with the increasing Fe2O3 content and silica-to-alumina (S/A) ratio. However, for the effect of CaO content, the AFTs reach a minimum value and then increase once again. Furthermore, the AFTs show no significant change as the K2O content varies. At last, all the conclusions found from the synthetic samples are also applicable for the seventeen bituminous coal ashes collected locally and abroad. (C) 2012 Elsevier Ltd. All rights reserved.