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Combustion of hydrogen-air in micro combustors with catalytic Pt layer

机译：带有催化铂层的微型燃烧器中的氢-空气燃烧

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摘要

Micro power generators have high power density. However, their key components micro combustors have low stability. In this experiment, catalyst is applied to improve the stability. The catalytic micro combustor is made from an alumina ceramic tube. It has inner diameter of 1 mm, outer diameter of 2.02 mm and length of 24.5 mm. It is prepared through impregnation of aqueous solution of H_2PtCl_6. The flammability limits and surface temperatures under different operation conditions are measured. The flow rates range from 0.08 to 0.4 L/min. According to the experimental results, catalyst is effective to inhibit extinction. For example, At 0.8 L/min, the stability limit is 0.193-14.9 in the non-catalytic combustor. After applying catalyst, the lean limit is near 0, and the rich limit is 29.3. But catalyst is less effective to inhibit blow out. Increasing flow rates also inhibits extinction. In the non-catalytic combustor, while the flow rates increase from 0.08 to 0.2 L/min, the lean stability limit decreases from 0.193 to 0.125. The experimental results indicate that catalyst induces shift downstream in the stoichiometric and rich cases. The numeric simulation verifies that the heterogeneous reaction weakens the homogeneous reaction through consuming fuels. Thus, the insufficient heat recirculation makes the reaction region shift downstream. However, lean mixture has intense reaction in the catalytic combustor. It is attributed to the high mass diffusion and low thermal diffusion of lean mixture.
机译：微型发电机具有高功率密度。然而，它们的关键部件微型燃烧器具有较低的稳定性。在该实验中，使用催化剂来提高稳定性。催化微型燃烧器由氧化铝陶瓷管制成。它的内径为1毫米，外径为2.02毫米，长度为24.5毫米。通过浸渍H_2PtCl_6的水溶液来制备。测量了不同操作条件下的可燃极限和表面温度。流速范围为0.08至0.4 L / min。根据实验结果，催化剂可有效抑制灭绝。例如，在0.8 L / min时，非催化燃烧器的稳定性极限为0.193-14.9。施加催化剂后，稀薄极限接近0，而浓薄极限为29.3。但是催化剂抑制爆燃的效果较差。流速增加也抑制了灭绝。在非催化燃烧器中，当流速从0.08升至0.2 L / min时，稀燃稳定性极限从0.193降低至0.125。实验结果表明，在化学计量比高的情况下，催化剂会引起下游位移。数值模拟验证了非均相反应通过消耗燃料削弱了均相反应。因此，不充分的热再循环使反应区域向下游移动。然而，稀薄混合物在催化燃烧器中具有强烈的反应。这归因于稀薄混合物的高质量扩散和低热扩散。

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  • 来源
    《Energy Conversion & Management》 |2010年第6期|p.1127-1133|共7页
  • 作者

    Yang Wang; Zhijun Zhou; Weijuan Yang; Junhu Zhou; Jianzhong Liu; Zhihua Wang; Kefa Cen;

  • 作者单位

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;

    State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China;

  • 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

    catalytic combustion; micro combustor; stability limits; hydrogen;

    机译：催化燃烧微型燃烧器稳定性极限;氢;

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