• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Conference on Greenhouse Gas Control Technologies >CHARACTERIZATION OF OXYGEN CARRIERS FOR CHEMICAL-LOOPING COMBUSTION
【24h】

CHARACTERIZATION OF OXYGEN CARRIERS FOR CHEMICAL-LOOPING COMBUSTION

机译：化学环燃烧氧载体的特征

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

摘要

Different oxygen carriers, based on copper, iron, manganese, and nickel and produced by three different preparation methods (mechanical mixing, impregnation, and freeze granulation), were tested during 100 successive oxidation-reduction cycles in a thermogravimetric analyzer (TGA) and in a fluidized bed (FB). The behavior of the different oxygen carriers with respect to selectivity towards complete oxidation products, durability in the cyclic reactions, and attrition and agglomeration during fluidized bed cyclic reactions were analyzed. In the multicycle tests in TGA, it was observed that most of the oxygen carriers exhibited high reactivity and excellent chemical stability but the Cu- and Ni-based oxygen carriers prepared by mechanical mixing underwent a rapid degradation of their mechanical properties as the number of cycles increased. Based on the TGA results, five oxygen carriers were selected to be tested in a FB reactor: Cu-Si-M, Cu-Si-I, Fe-Al-M, Mn-Zr-M, and Ni_(CUT)-FG. In the FB tests, it was observed that Mn and Cu based carriers prepared by mechanical mixing (M) showed agglomeration, however, this problem was not observed with the Cu-based carriers prepared by impregnation (I). The Ni- and the Fe-based oxygen carriers did not agglomerate. The attrition rates of the carriers were usually high in the first cycles due to the rounding effects on the particles and because of the fines sticked to the particles during preparation. Later, the attrition rates due to the internal changes produced in the particles by the successive reduction and oxidation processes decreased, and all carriers showed low attrition rates. The product distribution during the oxidation of the fuel depended on the metal oxide used in the oxygen carrier. Complete conversion of CH_4 to CO_2 and H_2O was obtained with the oxygen carrier Cu-Al-I. With the oxygen carrier Fe-Al-M the gas outlet composition was associated to the different reaction steps of the iron oxide. Finally, with the oxygen carrier Ni_(CUT)-FG prepared by freeze granulation (FG), a combination of CO_2, H_2O, CO, and H_2 was formed almost immediately after introduction of CH_4 into the reactor and after a short reaction time the process was mainly selective towards the formation of H_2 and CO.
机译：基于铜，铁，锰和镍并通过三种不同的制备方法（机械混合，浸渍和冷冻制粒）的不同氧携带者在热量分析仪（TGA）中的100连续氧化还原循环期间进行测试流化床（FB）。分析了不同氧载体对完全氧化产物的选择性，循环反应中的耐久性以及流化床环状反应期间的耐久性和聚集的行为。在TGA的多单身试验中，观察到大多数氧载体表现出高反应性和优异的化学稳定性，而是通过机械混合制备的Cu-and Ni的氧载体在其机械性能的快速降解中作为循环的循环次数进行快速降解增加。基于TGA结果，选择五种氧载体在FB反应器中测试：Cu-Si-M，Cu-Si-I，Fe-Al-M，Mn-Zr-M和Ni_（切割）-Fg 。在FB试验中，观察到通过机械混合（M）制备的Mn和Cu基载体显示聚集，然而，未通过浸渍（I）制备的Cu基载体观察该问题。 Ni-和Fe基氧携带者没有凝聚。由于对颗粒对颗粒的圆润效应，并且由于在制备期间粘附在颗粒上的粉末，载体的磨损率通常在第一周期中高。后来，由于颗粒中的内部变化导致的磨损率通过连续的减少和氧化过程降低，并且所有载波都显示出低磨损率。燃料氧化过程中的产物分布依赖于氧载体中使用的金属氧化物。用氧载体Cu-Al-1获得CH_4至CO_2和H_2O的完全转化。通过氧载体Fe-Al-M，气体出口组合物与氧化铁的不同反应步骤相关。最后，通过通过冷冻造粒（FG）制备的氧载体Ni_（切割）-Fg，在将CH_4引入反应器后几乎立即形成CO_2，H_2O，CO和H_2的组合，并在短时间内的过程后主要是选择性地形成H_2和CO。

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