...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Rapid devolatilisation of Yallourn brown coal at high pressures and temperatures
【24h】

Rapid devolatilisation of Yallourn brown coal at high pressures and temperatures

机译：雅洛恩褐煤在高压和高温下快速脱挥发分

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 pressurised drop-tube furnace was used to study the devolatilisation behaviour of Yallourn brown coal. Coal particles of 37--53 μm size were devolatilised at pressures of l00, 500 and l000 kPa. The experiments were carried out at temperatures of 873, l073 and l273 K. Residence times were varied from 0.02 to 3 s. Weight loss was calculated based on ash as a tracer. The maximum weight loss due to devolatilisation is temperature and pressure dependent. At a particular residence time and pressure, the weight loss increases with an increase in devolatilisation temperature. Increasing the pressure not only increases the residence time required to achieve a given level of weight loss, but also reduces the total weight loss attainable at a particular temperature. Weight loss due to devolatilisation was fitted by a 2--stage first- order kinetic expression. The calculated kinetic parameters are considerably lower than the reported parameters for lignites and bituminous coals. It appears that initial devolatilisation of Yallourn brown coal is mainly dominated by very low activation energy. Variation of activation energy with the level of devolatilisation was observed. This variation could be partially due to the presence of active sites in the char with different characteristic reactivities.
机译：使用加压滴管式炉研究雅洛恩褐煤的脱挥发分行为。在100、500和1000 kPa的压力下将37--53μm大小的煤颗粒脱挥发分。实验在873、1073和1273 K的温度下进行。停留时间在0.02到3 s之间变化。重量损失基于灰分作为示踪剂计算。由于脱挥发分而造成的最大重量损失取决于温度和压力。在特定的停留时间和压力下，重量损失随着脱挥发分温度的升高而增加。增加压力不仅增加了达到给定重量减轻水平所需的停留时间，而且降低了在特定温度下可达到的总重量减轻。通过脱挥发分引起的体重减轻通过两阶段一级动力学表达拟合。计算出的动力学参数明显低于褐煤和烟煤的报道参数。看来，雅洛恩褐煤的最初脱挥发分主要由非常低的活化能决定。观察到活化能随脱挥发分的水平而变化。这种变化可能部分归因于焦炭中具有不同特征反应性的活性位点的存在。

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