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首页> 外文学位 >INVESTIGATION OF THE CHARACTERISTICS OF A COAL BURNING RIJKE TYPE PULSATING COMBUSTOR.
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INVESTIGATION OF THE CHARACTERISTICS OF A COAL BURNING RIJKE TYPE PULSATING COMBUSTOR.

机译：煤燃烧的Rijke型脉动燃烧器的特性研究。

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摘要

This study is concerned with the evaluation of the performance characteristics of a coal burning Rijke type pulsating combustor. The combustor consists of an open ended vertical tube with a coal burning bed located in the middle of its lower half. The liberation of heat by the combustion process at this location results in spontaneous excitation of the fundamental, longitudinal, acoustic mode of the tube and the acoustic oscillations lead to significant intensification of the combustion process. An 108 inch long 5.5 inch internal diameter combustor was constructed and instrumented for this investigation. The measurements performed during a series of experiments conducted at various air/fuel ratios and coal feed rates include: dB level of pulsations at the mid section of the combustor, frequency of oscillations, temperatures at different locations inside the combustor, mass emission rates of generated particulates, and CO, CO(,2), NO(,x), and SP(,2) concentrations in the exhaust products of the combustor. The study demonstrated that the developed pulsating combustor can burn coal stably and continuously under a variety of air/fuel ratios and that maximum amplitudes of acoustic pressure occur when operation is conducted near stoichiometric conditions. It was also verified that the presence of pulsations resulted in a very efficient and intense combustion process. The measured CO and CO(,2) concentrations were used to determine the combustion efficiencies of the combustor which were higher than 95% for operations conducted with 13% excess of air at feed rates located in the range 42 - 60 lb/ft('2) hr (52.5 - 75 gr/min). Maximum heat release rates of approximately 0.87 MBtu/ft('2) hr were obtained with the developed combustor, a value that compares very favorably with the characteristic heat release rates of state-of-the-art combustors.
机译：这项研究与评估燃煤Rijke型脉动燃烧器的性能特性有关。燃烧室由一个开口的垂直管组成，燃烧管的下半部中间有一个燃煤床。燃烧过程在此位置释放的热量导致管的基本，纵向，声学模式的自发激发，并且声学振荡导致燃烧过程明显加剧。构造了108英寸长，5.5英寸内径的燃烧器，并进行了测量。在各种空燃比和给煤速率下进行的一系列实验中进行的测量包括：燃烧室中部的dB脉动水平，振荡频率，燃烧室内部不同位置的温度，产生的质量排放率燃烧器排气产物中的颗粒物以及CO，CO（，2），NO（，x）和SP（，2）浓度。研究表明，开发的脉动燃烧器可以在各种空燃比下稳定，连续地燃烧煤炭，并且在化学计量条件附近运行时会出现最大声压振幅。还证实了脉动的存在导致非常有效和强烈的燃烧过程。所测量的CO和CO（，2）浓度用于确定燃烧器的燃烧效率，对于以42至60 lb / ft（' 2）小时（52.5-75 gr / min）。使用开发的燃烧器可获得约0.87 MBtu / ft（'2）hr的最大放热率，该值与最先进的燃烧器的特征性放热率相比非常有利。

著录项

  • 作者

    CARVALHO, JOAO ANDRADE, JR.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1983
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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