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首页> 外文期刊>Energy & fuels >Comparative Study of the Effect of Different Coal Fly Ashes on the Performance of Oxygen Carriers for Chemical Looping Combustion
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Comparative Study of the Effect of Different Coal Fly Ashes on the Performance of Oxygen Carriers for Chemical Looping Combustion

机译：不同粉煤灰对化学环流燃烧氧气载体性能影响的比较研究

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摘要

The application of chemical looping combustion (CLC) to solid fuels for the purpose of electric power generation from coal is the focus of research at the Center for Applied Energy Research (CAER), University of Kentucky, Lexington, KY. One important aspect for the use of CLC for solid fuels is the effect of ash on the capacity and reactivity of the oxygen carrier (OC). Four different coal-derived fly ashes obtained from electric power plants were used to study the effect of the ash on the ability of an OC to oxidize the carbon in a beneficiated gasification coal char containing 58.9% carbon. The four coal ashes were obtained from the following sources representing different coal ranks: sub-bituminous (Bulgaria), bituminous (China), Texas lignite (U.SA), and Powder River Basin sub-bituminous (U.S.A.). The OC was 50% Fe_2O_3 on an Al_2O_3 support. The OC was made by freeze granulation (FG) at the CAER. Mixtures of char/OC/ash with increasing ash contents to 75% were tested in a thermal analyzer coupled to a mass spectrometer (TGMS) system at 950 ℃ and a purge of argon for 5 h. Carbon determinations before and after heating were used to calculate the amount of carbon removed from the char by the OC as an indication of the oxygen-transfer capacity of the OC. Reduction reaction rates were determined from the differential of the weight loss curves from the TG. The lignite ash had a beneficial effect on the ability of OC to oxidize carbon, but all other ashes were detrimental and reduced the ability of the OC to remove carbon from the mixtures. Low concentrations of ash increased reduction rates, but a concentration of 75% significantly slowed the rate. This study indicated that consideration will have to be given for each type of ash generated from different coal sources for the successful application of CLC to solid fuels.
机译：将化学循环燃烧（CLC）应用于以煤为动力的固体燃料是肯塔基州列克星敦市肯塔基大学应用能源研究中心（CAER）的研究重点。将CLC用于固体燃料的一个重要方面是灰分对氧气载体（OC）的容量和反应性的影响。从电厂获得的四种不同的煤粉煤灰被用于研究灰分对精选的气化煤焦（含58.9％的碳）中OC氧化碳的能力的影响。这四种煤灰是从代表不同煤种的以下来源获得的：亚烟煤（保加利亚），烟煤（中国），德克萨斯褐煤（美国）和粉河盆地亚烟煤（美国）。在Al_2O_3载体上，OC为50％Fe_2O_3。 OC是通过在CAER上进行冷冻造粒（FG）制成的。在结合了质谱仪（TGMS）的热分析仪中，在950℃的温度下分析了焦炭/ OC /灰分（其灰分增加至75％）的混合物，并吹扫了5 h。加热之前和之后的碳测定用于计算由OC从焦炭中除去的碳量，以此作为OC的氧转移能力的指标。根据TG的失重曲线的差异确定还原反应速率。褐煤灰对OC氧化碳的能力具有有益的作用，但是所有其他灰烬都是有害的并且降低了OC从混合物中去除碳的能力。低浓度的灰分会降低还原率，但是75％的浓度会明显降低还原率。这项研究表明，要成功将CLC应用于固体燃料，必须考虑从不同煤炭来源产生的每种灰分。

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  • 来源
    《Energy & fuels》 |2012年第mayajuna期|p.3156-3161|共6页
  • 作者

    Aurora Rubel; Yi Zhang; James K. Neatheiy; Kunlei Liu;

  • 作者单位

    Center for Applied Energy Research (CAER), University of Kentucky, 2540 Research Park Drive, Lexington, Kentucky 40511-8410, United States;

    Center for Applied Energy Research (CAER), University of Kentucky, 2540 Research Park Drive, Lexington, Kentucky 40511-8410, United States;

    Center for Applied Energy Research (CAER), University of Kentucky, 2540 Research Park Drive, Lexington, Kentucky 40511-8410, United States;

    Center for Applied Energy Research (CAER), University of Kentucky, 2540 Research Park Drive, Lexington, Kentucky 40511-8410, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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