...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Correlations between the sodium adsorption capacity and the thermal behavior of modified kaolinite during the combustion of Zhundong coal
【24h】

Correlations between the sodium adsorption capacity and the thermal behavior of modified kaolinite during the combustion of Zhundong coal

机译：准东煤燃烧过程中钠吸附能力与改性高岭土热行为的相关性。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Kaolin is often utilized as an additive to relieve fouling and slagging problems in boilers. In a previous work of the authors it was successfully employed the modification of intercalation-exfoliation method to improve the adsorption capacity of kaolinite at 1000 degrees C, and this work aimed to investigate the best adsorption performance and corresponding application temperature of modified kaolinite at different temperatures. The adsorption experiment with Zhundong coal was conducted from 650 degrees C to 1200 degrees C. The thermal behavior of modified kaolinite was characterized over a wide temperature range to reveal the mechanism from the perspective of structural change. Results showed that modified kaolinite exhibited the best adsorption performance at 800 degrees C, with the adsorption capacity increasing by 39% after modification. The effect of modification on kaolin was also reflected in the thermal behavior. About 43% of the hydroxyl groups were removed via modification, the amount of mullite above 1100 degrees C approximately decreased by 38%, and the expulsion of crystalline SiO2 was totally inhibited by modification, suggesting that modification affected the reconstruction of Si/Al-related compounds at high temperature. In addition, the enhanced yield of unsaturated Al (V) at 800 degrees C after modification was totally consistent with the improved adsorption capacity of modified kaolinite at 800 degrees C. It is concluded that kaolinite can be used at higher temperature with improved adsorption capacity through a modification of intercalation-exfoliation method, which was presumably related to the greater content of 5-coordinated Al in modified kaolinite. Moreover, this discovery indicated that Al (V) content might be a useful index for the selection of various aluminasilicates as efficient adsorbents in furnace.
机译：高岭土通常被用作减轻锅炉结垢和结渣问题的添加剂。在作者先前的工作中，成功地采用了插层-剥离方法的改进来提高高岭石在1000℃下的吸附能力，该工作旨在研究改性高岭石在不同温度下的最佳吸附性能和相应的应用温度。 。在650℃至1200℃的温度下进行准东煤的吸附实验。对改性高岭石的热行为进行了较宽的温度范围表征，从结构变化的角度揭示了其机理。结果表明，改性高岭石在800℃时表现出最佳的吸附性能，改性后的吸附容量增加39％。改性对高岭土的影响也反映在热行为上。通过改性去除了约43％的羟基，1100℃以上的莫来石含量大约减少了38％，结晶SiO2的排出被改性完全抑制了，这表明改性影响了Si / Al相关结构的重建高温下的化合物。此外，改性后在800摄氏度下提高不饱和Al（V）的产率与改性高岭石在800摄氏度下提高的吸附能力完全一致。结论是高岭土可以通过以下方式在更高温度下使用，具有更高的吸附能力：插层-剥离法的一种改进，它可能与改性高岭石中5-配位Al的含量较高有关。而且，该发现表明Al（V）含量可能是选择各种铝硅酸盐作为炉中有效吸附剂的有用指标。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号