...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >Effect of Temperature and CO_2 Concentration on Gasification Behavior of Carbon Fiber Containing Fine Iron Particles
【24h】

Effect of Temperature and CO_2 Concentration on Gasification Behavior of Carbon Fiber Containing Fine Iron Particles

机译：温度和CO_2浓度对含细铁颗粒碳纤维气化行为的影响

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

In direct reduced iron (DRI) process, CO-H_2 gas mixture is used as a reducing agent, which may make the operation unstable owing to a carbon deposition reaction and metal dusting reaction through Fe_3C. The Fe_3C decomposition reaction forms iron particles which acts as a catalyst for a carbon fiber deposition reaction at around 600℃. Such a carbon fiber deposition not only causes the loss of the carbon but also decrease the reducibility of the gas. On the other hand, the carbon fiber is likely gasified by CO-CO_2 gas mixture at around 1 000℃. In the present study, the carbon fiber gasification was quantitative analyzed using thermobalance to clarify the mechanism of the carbon fiber gasification reaction. To prepare a carbon fiber sample, the carbon was deposited with a reduced iron catalyst at 600℃ in 50vol%CO-50vol%H_2. Carbon fiber containing fine iron particles was gasified with various compositions of CO-CO_2 gas mixture at 1 000℃. Further, the effect of temperature of the gasified reaction was also investigated at 800℃, 900℃ and 1 000℃ in 100vol%CO_2. According to XRD analysis of the sample after gasification, Fe_3C in the sample before gasification decomposed to iron and a portion of iron was oxidized to Fe_3O_4 and FeO when gasification ratio was high. The transition of carbon fiber shape was confirmed by SEM observation. Fine iron particles located on the tip of carbon fiber were sintered during gasification of carbon fiber. The mechanism of carbon fiber gasification was evaluated considering crystalline size, such as L_a and L_c that show (002) and (110) determined by XRD analysis, respectively. It was found that the L_a decreased with gasification ratio at all temperatures. In addition, L_c decreased after gasification at 1 000℃.
机译：在直接还原铁（DRI）工艺中，CO-H_2气体混合物用作还原剂，由于通过Fe_3C进行的碳沉积反应和金属粉尘反应，可能会使操作不稳定。 Fe_3C分解反应形成铁颗粒，该铁颗粒充当600℃左右碳纤维沉积反应的催化剂。这种碳纤维沉积不仅导致碳的损失，而且降低了气体的还原性。另一方面，碳纤维很可能在1000℃左右被CO-CO_2混合气化​​。在本研究中，使用热天平对碳纤维气化进行了定量分析，以阐明碳纤维气化反应的机理。为了制备碳纤维样品，将碳用还原铁催化剂在600℃的50vol％CO-50vol％H_2中沉积。含碳细铁颗粒的碳纤维在1 000℃下用各种成分的CO-CO_2气体混合物气化。此外，还研究了在100vol％CO_2中在800℃，900℃和1000℃下气化反应温度的影响。根据气化后样品的XRD分析，气化率高时，气化前样品中的Fe_3C分解成铁，一部分铁被氧化成Fe_3O_4和FeO。碳纤维形状的转变通过SEM观察证实。在碳纤维的气化过程中，对位于碳纤维尖端的铁微粒进行了烧结。碳纤维气化的机理是通过考虑晶体大小来评估的，例如通过XRD分析确定的L_a和L_c分别显示（002）和（110）。发现在所有温度下，L_a均随着气化率而降低。另外，在1000℃下气化后，L_c降低。

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