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Effect of coal blending and ashing temperature on ash sintering and fusion characteristics during combustion of Zhundong lignite

机译：掺煤和灰化温度对准东褐煤燃烧过程中灰分烧结和熔融特性的影响

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摘要

Ash sintering and fusion characteristics of pulverised Zhundong lignite and its blends combusted at different temperatures in a muffle furnace were investigated. Zhundong lignite (ZL) was blended with an Australian bituminous (AB) and an Indonesian lignite (IL), respectively, at various blending ratios. The blends were then combusted in the muffle furnace in air at 550 degrees C and 815 degrees C. The sintering and fusion temperatures of the ashes of the blends were determined. In addition, the ashes prepared at 550 degrees C were further heated to 850 degrees C, 1050 degrees C and 1250 degrees C in air for different periods of time to study the mineralogical and morphological changes during the ash sintering and fusion. The results showed that the ZL ash at 815 degrees C was rich in basic oxides with Ca-bearing minerals anhydrite, calcium silicate and yeelimite being dominant, incurring relatively low ash sintering and fusion temperatures. Both AB and IL ashes, however, were rich in acidic oxides and dominant with refractory minerals such as quartz or mullite, leading to relatively high ash sintering and fusion temperatures. As the AB or IL addition ratio in the blend increased, the ash sintering temperature also increased, indicating that the addition of AB or IL into ZL decreased the ash sintering tendency. However, as the AB or IL addition ratio increased, the ash softening temperature (ST) and fluid temperature (FT) decreased first and then increased, reaching the lowest values at addition ratios of 40% for AB and 20% for IL. In addition, owing to the higher alkali and alkali earth contents in the forms of fluxing minerals, the sintering and fusion temperatures of the ash samples at 550 degrees C were correspondingly lower than those of the ashes at 815 degrees C. XRD and SEM-EDS analyses of the ash heated at 850 degrees C, 1050 degrees C and 1250 degrees C revealed that the sintering of the ZL ash was attributed to Na- and Cl-bearing minerals whereas the fusion of the ZL ash was attributed to the eutectics enriched with Ca, Al, Fe, and S. The addition of 20% AB into ZL resulted in the formation of hauyne, gehlenite and nepheline of low melting points and thus promoted the fusion of the ZL80AB20 ash, explaining why FT and HT of the ash initially decreased with increasing AB addition. (C) 2017 Elsevier Ltd. All rights reserved.
机译：研究了在马弗炉中粉化准东褐煤及其混合物在不同温度下燃烧后的灰分烧结和熔融特性。将准东褐煤（ZL）与澳大利亚沥青（AB）和印度尼西亚褐煤（IL）分别以各种混合比例进行混合。然后将混合物在马弗炉中在550摄氏度和815摄氏度的空气中燃烧。确定混合物的灰分的烧结和熔融温度。此外，将在550摄氏度下制备的骨灰在空气中进一步加热到850摄氏度，1050摄氏度和1250摄氏度，持续不同的时间，以研究灰分烧结和熔融过程中的矿物学和形态变化。结果表明，ZL灰在815摄氏度时富含碱性氧化物，其中以Ca为主的硬石膏，硅酸钙和yelimite矿物占主导，灰分烧结和熔融温度较低。但是，AB和IL灰均富含酸性氧化物，并以难熔矿物（如石英或莫来石）为主，导致较高的灰分烧结和熔融温度。随着共混物中AB或IL的添加比例增加，灰分烧结温度也增加，这表明将AB或IL添加到ZL中降低了灰分烧结趋势。但是，随着AB或IL添加比例的增加，灰分软化温度（ST）和流体温度（FT）先降低然后升高，在AB添加为40％，IL添加为20％时达到最低值。此外，由于以助熔矿物形式存在的碱金属和碱土金属含量较高，因此在550摄氏度下灰分样品的烧结和熔融温度相应地低于在815摄氏度下灰烬的烧结和熔融温度。XRD和SEM-EDS对在850°C，1050°C和1250°C加热的灰分的分析表明，ZL灰的烧结归因于含Na和Cl的矿物，而ZL灰的熔合归因于富含Ca的共晶物。 ，铝，铁和硫。向ZL中添加20％AB导致形成低熔点的片状沸石，方铅矿和霞石，从而促进ZL80AB20灰的熔融，这解释了为什么灰的FT和HT最初降低随着AB添加量的增加。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第may1期|131-142|共12页
  • 作者

    Li Jianbo; Zhu Mingming; Zhang Zhezi; Zhang Kai; Shen Guoqing; Zhang Dongke;

  • 作者单位

    Univ Western Australia, Ctr Energy M473, 35 Stirling Highway, Crawley, WA 6009, Australia;

    Univ Western Australia, Ctr Energy M473, 35 Stirling Highway, Crawley, WA 6009, Australia;

    Univ Western Australia, Ctr Energy M473, 35 Stirling Highway, Crawley, WA 6009, Australia;

    Univ Western Australia, Ctr Energy M473, 35 Stirling Highway, Crawley, WA 6009, Australia|North China Elect Power Univ, Beijing Key Lab Emiss Surveillance & Control Ther, Beijing 102206, Peoples R China;

    Univ Western Australia, Ctr Energy M473, 35 Stirling Highway, Crawley, WA 6009, Australia|North China Elect Power Univ, Beijing Key Lab Emiss Surveillance & Control Ther, Beijing 102206, Peoples R China;

    Univ Western Australia, Ctr Energy M473, 35 Stirling Highway, Crawley, WA 6009, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ash fusibility; Ash sintering; Ashing temperature; Coal blending; Zhundong lignite; Mineral transformation;

    机译：灰熔点;灰烧结;灰温度;煤炭掺混;准东褐煤;矿物转化;

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