材料科学
冶金
底灰
石灰
微观结构
煤
镁
窑
粉煤灰
耐火材料(行星科学)
溶解
扫描电子显微镜
水泥
水泥窑
复合材料
化学工程
废物管理
工程类
作者
Naresh Kumar Wagri,Markus Carlborg,Matias Eriksson,Charlie Ma,Markus Broström,Britt M. Andersson
出处
期刊:Fuel
[Elsevier]
日期:2023-06-01
卷期号:342: 127711-127711
标识
DOI:10.1016/j.fuel.2023.127711
摘要
Magnesium oxide (MgO)-based refractories are commonly used in quicklime and cement rotary kilns. At the high temperatures in the kiln burn zone, the infiltration of molten fuel ash into the refractory can occur. Subsequent chemical interactions can cause refractory wear that inflicts high maintenance costs and loss of production. To improve refractory reliability, it is necessary to increase the understanding of the interactions between fuel ash slag and refractory liner materials. Three commercially available MgO-based refractory materials were exposed to coal ash at 1200 °C and 1400 °C for between 15 and 60 min under a CO2-rich gaseous environment. Hot slag from the coal ash infiltrated the refractories and the infiltration depths were estimated with scanning electron microscope with energy dispersive X-ray spectroscopy. Based on detailed elemental and microstructure analyses, the interactions between ash and refractory were examined. Molten silicates infiltrated the refractory through grain boundaries and pores into depths of up to 2.8 mm. Powder X-ray diffraction of the exposed refractory samples indicated that MgO grains reacted with SiO2-containing phases to form Mg2SiO4. This was identified as a corrosion product whose formation was supported by thermochemical equilibrium calculations. Elevated Mg content was found in the ash residue on top of the samples, indicating the dissolution or dislocation of refractory components. In addition, phases such as MgO were identified in the ash residue.
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