...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Size distribution of unburned carbon in coal fly ash and its implications
【24h】

Size distribution of unburned carbon in coal fly ash and its implications

机译：粉煤灰中未燃烧碳的粒度分布及其意义

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

A set of nine coal fly ashes, obtained from various US utilities, were fractionated by standard dry-sieving techniques. The carbon contents of the different size fractions were measured, and the nature of the carbon particles was microscopically examined. Significant differences were found in the distribution of carbon in class F and class C ashes. The 'foam index' test is commonly used for quick evaluation of the suitability, with respect to air entrainment, of pozzolanic additives for concrete. This test measures adsorption of air entraining admixtures (AEAs) by the carbon in the fly ash. Application of this test to the different ash fractions confirmed that the smallest particle size fractions of ash make the major contribution to AEA adsorption. The carbon from class F ash has a comparable capacity for AEA adsorption as carbon from class C ash, when compared on a surface area basis. What makes the class C carbons apparently 'worse' is the fact that they have much higher surface areas than class F carbons (and it is only by virtue of the low carbon mass in most class C ashes that problems with these ashes are not more common). The importance of accessibility of the surface is also clearly seen from these results.
机译：通过标准干筛技术将从美国多家公用事业公司获得的九种煤粉煤灰分馏。测量了不同尺寸部分的碳含量，并在显微镜下检查了碳颗粒的性质。发现F类和C类灰中碳的分布存在显着差异。 “泡沫指数”测试通常用于快速评估火山灰添加剂对混凝土的空气夹带性。该测试测量了粉煤灰中的碳对夹带空气的混合物（AEA）的吸附。该测试对不同灰分的应用表明，灰分最小的灰分对AEA吸附起了主要作用。当以表面积为基础进行比较时，来自F类灰的碳具有与来自C类灰的碳相当的AEA吸附能力。使C类碳显然“更糟”的原因是，它们的表面积比F类碳高得多（并且仅由于大多数C类灰中碳含量低，这些灰的问题并不普遍） ）。从这些结果也清楚地看出了表面可及性的重要性。

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