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Ilmenite with addition of NiO as oxygen carrier for chemical-looping combustion

机译：钛铁矿加上NiO作为氧气载体用于化学循环燃烧

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摘要

The naturally occurring mineral ilmenite, FeTiO_3, has been examined as oxygen carrier for chemical-looping combustion. NiO-based particles have been used as an additive, in order to examine if it is possible to utilize the catalytic properties of metallic Ni to facilitate decomposition of hydrocarbons into more reactive combustion intermediates such as CO and H_2. Firstly, ilmenite was examined by oxidation and reduction experiments in a batch fluidized-bed reactor. These experiments indicated moderate reactivity between ilmenite and CH_4, which was used as reducing gas. However, adding 5 vt.% of NiO-based particles to the ilmenite improved the conversion of CH_4 greatly, resulting in an increase in combustion efficiency with a factor of 3. Secondly, 83 h of chemical-looping combustion experiments were conducted in a small circulating fluidized-bed reactor, using ilmenite as oxygen carrier and natural gas as fuel. A wide range of process parameters and different levels of NiO addition were examined. Occasionally, there were problems with the circulation of solids between the air reactor and fuel reactor, but most of the time the experiments worked well. The products were mostly CO_2, H_2O and unconverted CH_4. Adding small amounts of NiO-based particles to the reactor increased the conversion of the fuel considerably. For the base case conducted at 900°, the combustion efficiency was 76% for pure ilmenite and 90% for the corresponding experiments with 1 wt.% NiO-based particles added to the reactor. The properties of ilmenite were found to change considerably during operation. Used particles had lower density, were more reactive and more porous than fresh particles. These changes appear to have been physical, and no unexpected chemical phases could be identified.
机译：天然矿物钛铁矿FeTiO_3已作为化学循环燃烧的氧气载体进行了研究。基于NiO的颗粒已被用作添加剂，以检查是否有可能利用金属Ni的催化特性来促进碳氢化合物分解成更具反应性的燃烧中间体，例如CO和H_2。首先，在间歇流化床反应器中通过氧化和还原实验检查了钛铁矿。这些实验表明钛铁矿与用作还原气体的CH_4之间具有中等反应性。然而，在钛铁矿中添加5 vt。％的NiO基颗粒可大大提高CH_4的转化率，从而使燃烧效率提高了3倍。其次，在较小的压力下进行了83 h的化学循环燃烧实验循环流化床反应器，以钛铁矿为氧气载体，天然气为燃料。检查了广泛的工艺参数和不同水平的NiO添加。有时，固体在空气反应堆和燃料反应堆之间的循环存在问题，但大多数时候实验效果良好。产物主要为CO_2，H_2O和未转化的CH_4。向反应器中添加少量的NiO基颗粒可大大提高燃料的转化率。对于在900°C下进行的基本情况，将1％（重量）的NiO基颗粒添加到反应器中，纯钛铁矿的燃烧效率为76％，相应实验的燃烧效率为90％。发现钛铁矿的性能在操作过程中发生了很大变化。用过的颗粒比新鲜颗粒具有更低的密度，更高的反应性和更多的多孔性。这些变化似乎是物理的，无法识别出意外的化学相。

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  • 来源
    《Fuel》 |2010年第11期|P.3523-3533|共11页
  • 作者

    Magnus Ryden; Marcus Johansson; Erik Cleverstam; Anders Lyngfelt; Tobias Mattisson;

  • 作者单位

    Department of Energy and Environment, Chalmers University of Technology, SE-412 96 Goeteborg, Sweden;

    rnDepartment of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Goeteborg, Sweden;

    rnDepartment of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Goeteborg, Sweden;

    rnDepartment of Energy and Environment, Chalmers University of Technology, SE-412 96 Goeteborg, Sweden;

    rnDepartment of Energy and Environment, Chalmers University of Technology, SE-412 96 Goeteborg, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chemical-looping combustion; ilmenite; natural gas;

    机译：化学循环燃烧;钛铁矿天然气;

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