...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Thermal science >Study on mass transfer property of oxygen molecules and kinetic regimes of pressured pulverized coal combustion
【24h】

Study on mass transfer property of oxygen molecules and kinetic regimes of pressured pulverized coal combustion

机译：煤粉燃烧过程中氧分子的传质特性及动力学规律研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effects of pressure on diffusion of oxygen molecules during the coal combustion could not be ignored. The compressibility factor of real oxygen is investigated to evaluate the deviation between real and ideal oxygen, and obtain the mean free path of real oxygen. Comparing the Knudsen pore diameter with the minimum pore diameter, it is found that with the increase of pressure, Knudsen diffusion cannot exist at low pressure and may delay to occur at higher temperature. When pressure exceeds 3.5 MPa, no Knudsen diffusion occurs within the whole temperature range of our research. Comparing the diffusion rate at 1 MPa with the burning rate, one can conclude that the combustion mainly take place on the internal and external surfaces, and the reaction is controlled by the chemical kinetics below 1400 K. When themperature is between 1400 K and 1600 K, the reaction is controlled by both the diffusion and the chemical kinetics. When the temperature is more than 1600 K, the combustion primarily happens on the external surfaces and is controlled by the diffusion.
机译：煤燃烧过程中压力对氧分子扩散的影响不容忽视。研究了真实氧气的压缩系数，以评估真实氧气与理想氧气之间的偏差，并获得真实氧气的平均自由程。将克努森孔径与最小孔径进行比较，发现随着压力的增加，克努森扩散在低压下将不存在，并可能在高温下延迟发生。当压力超过3.5 MPa时，在我们研究的整个温度范围内都不会发生Knudsen扩散。将1 MPa的扩散速率与燃烧速率进行比较，可以得出结论，燃烧主要发生在内表面和外表面，并且反应受低于1400 K的化学动力学控制。当它们的性能介于1400 K和1600 K之间时，反应受扩散和化学动力学控制。当温度高于1600 K时，燃烧主要发生在外表面，并受扩散控制。

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