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Surface tension measurements of coal ash slags under reducing conditions at elevated pressures

机译：在高压下还原条件下粉煤灰渣的表面张力测量

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摘要

The aim of limiting the amount of CO_2 that is released together with other exhaust gases from power plants can be reached by technologies allowing for a systematic separation of this greenhouse gas. One such technology is the integrated gasification combined cycle power plant which makes use of a coal gasification step. For the gasification involving temperatures far higher than in typical pulverised combustion chambers, ash contained in the fuel is liquefied (slag) and must be removed from the cycle to guarantee safe operation of downstream equipment. To keep the efficiency of the power plant as high as possible, hot gas cleaning facilities are most desirable for this purpose. The design of these installations necessitates knowledge about thermophysical properties of coal ash slags, especially in reducing, pressurised atmospheres. In this work, the surface tension of 15 coal ash slags was measured in argon hydrogen gas of up to 10 bar absolute pressure according to the sessile drop method. Compared to experiments at 1 bar, surface tension values up to 42% lower were found on applying pressure. Additionally, shifts in the melting temperature interval of the ashes due to increased pressure were observed. The surface tension values obtained in pressurised atmospheres ranged from 270 to 490 mN/m with respect to temperature intervals where almost no data scattering occured.
机译：限制发电厂中与其他废气一起释放的CO_2量的目标可以通过允许对这种温室气体进行系统分离的技术来实现。一种这样的技术是利用煤气化步骤的整体气化联合循环发电厂。对于涉及温度远高于典型粉状燃烧室的气化，燃料中所含的灰分会被液化（炉渣），必须从循环中清除，以确保下游设备的安全运行。为了保持发电厂的效率尽可能高，为此最需要热气清洁设施。这些设备的设计需要了解煤灰渣的热物理性质，尤其是在还原加压气氛中。在这项工作中，根据无滴法，在高达10 bar绝对压力的氩气氢气中测量了15种煤灰渣的表面张力。与1 bar的实验相比，施加压力时表面张力值降低了42％。另外，观察到由于压力增加而导致的骨灰熔化温度区间的变化。相对于几乎不发生数据散射的温度间隔，在加压气氛中获得的表面张力值在270至490 mN / m的范围内。

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  • 来源
    《Fuel》 |2011年第1期|p.280-287|共8页
  • 作者

    Tobias Melchior; Marc Biaesing; Guenther Puetz; Michael Mueller;

  • 作者单位

    Institute of Energy Research, Forschungszentrum Juelich GmbH, Juelich, Germany;

    Institute of Energy Research, Forschungszentrum Juelich GmbH, Juelich, Germany;

    Institute of Energy Research, Forschungszentrum Juelich GmbH, Juelich, Germany;

    Institute of Energy Research, Forschungszentrum Juelich GmbH, Juelich, Germany;

  • 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

    surface tension; coal ash slag; sessile drop; pressurised atmosphere; IGCC;

    机译：表面张力;粉煤灰渣;无柄滴加压气氛;IGCC;

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