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Evaluation of different oxygen carriers for biomass tar reforming (I): Carbon deposition in experiments with toluene

机译：用于生物质焦油重整的不同氧气载体的评估（I）：甲苯实验中的碳沉积

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摘要

In this work, an innovative method for gas conditioning in biomass gasification is analyzed. The objective is to remove tar by selectively reforming the unwanted hydrocarbons in the product gas with a chemical looping reformer (CLR), while minimizing the carbon formation during the process. Toluene, in a concentration of 600-2000 ppmv, was chosen as a tar model compound. Experiments were performed in a TGA apparatus and a fixed bed reactor. Four oxygen carriers (60% NiO/MgAl_2O_4 (Ni60), 40% NiO/NiAl_2O_4 (Ni40), 40% Mn_3O_4/Mg-ZrO_2 (Mn40) and FeTiO_3 (Fe)) were tested under alternating reducing/oxidizing cycles. Several variables affecting the reducing cycle were analyzed: temperature, time for the reduction step and H_2O/C_7H_8 molar ratio. Ni40 and Mn40 presented interesting characteristics for CLR of biomass tar. Both showed stable reactivity to C_7H_8 after a few cycles. Ni40 showed a high tendency to carbon deposition compared to Mn40, specially at high temperatures. Carbon deposition could be controlled by decreasing the temperature and the time for the reduction step. The addition of water also reduced the amount of carbon deposited, which was completely avoided working with a H_2O/C_7H_8 molar ratio of 26.4.
机译：在这项工作中，分析了一种用于生物质气化的气体调节的创新方法。目的是通过使用化学回路重整器（CLR）选择性重整产品气中不需要的碳氢化合物来去除焦油，同时最大程度地减少过程中的碳形成。选择浓度为600-2000 ppmv的甲苯作为焦油模型化合物。实验在TGA设备和固定床反应器中进行。在交替的还原/氧化循环下测试了四种氧载体（60％NiO / MgAl_2O_4（Ni60），40％NiO / NiAl_2O_4（Ni40），40％Mn_3O_4 / Mg-ZrO_2（Mn40）和FeTiO_3（Fe））。分析了影响还原循环的几个变量：温度，还原步骤的时间和H_2O / C_7H_8摩尔比。 Ni40和Mn40对生物质焦油的CLR表现出有趣的特征。几个循环后，两者都显示出对C_7H_8的稳定反应性。与Mn40相比，Ni40表现出很高的碳沉积趋势，特别是在高温下。可以通过降低还原步骤的温度和时间来控制碳沉积。加水还减少了沉积的碳量，这完全避免了在H_2O / C_7H_8摩尔比为26.4的情况下进行。

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  • 来源
    《Fuel》 |2011年第3期|p.1049-1060|共12页
  • 作者

    Teresa Mendiara; Joakim M. Johansen; Ruben Utrilla; Paulo Geraldo; Anker D. Jensen; Peter Glarborg;

  • 作者单位

    Department of Chemical and Biochemical Engineering, Technical University of Denmark. 2800 Lyngby, Denmark;

    Department of Chemical and Biochemical Engineering, Technical University of Denmark. 2800 Lyngby, Denmark;

    Department of Chemical and Biochemical Engineering, Technical University of Denmark. 2800 Lyngby, Denmark;

    Department of Chemical and Biochemical Engineering, Technical University of Denmark. 2800 Lyngby, Denmark;

    Department of Chemical and Biochemical Engineering, Technical University of Denmark. 2800 Lyngby, Denmark;

    Department of Chemical and Biochemical Engineering, Technical University of Denmark. 2800 Lyngby, Denmark;

  • 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

    biomass gasification; chemical looping; reforming; tar; toluene;

    机译：生物质气化;化学环化;重整;焦油;甲苯;

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