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The Determination of Effective Diffusivity Evolution During Single Coal Char Particle Combustion Using a Macro-TG

机译:用Macro-TG确定单煤焦颗粒燃烧过程中的有效扩散率演变

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摘要

Gas effective diffusivity of single coal char particle is a key parameter in modeling coal-fired traveling grate boilers, which are extensively used in China with a low efficiency. The effective diffusivity varies during the combustion because of the changing pore structure caused by ash layer development. A macro-TG was designed to obtain the evolving effective diffusivity by measuring the combustion rate of a single coal char particle in one-dimensional combustion. The effective diffusivity decreased with the layer thickness increase, and both coal rank and temperature were contributing factors to the variation behavior. An exponential function was found between the effective diffusivity and the layer thickness, and was used to reveal the pattern of pore structure evolution.
机译:单一煤焦颗粒的气体有效扩散率是模拟燃煤移动炉排锅炉的关键参数,而燃煤移动炉排锅炉在中国效率很低。在燃烧过程中,有效扩散率会由于灰分层的形成而导致孔隙结构的变化而发生变化。通过测量一维燃烧中单个煤焦颗粒的燃烧速率,设计了宏观TG,以获得不断发展的有效扩散率。有效扩散系数随层厚度的增加而降低,煤阶和温度都是影响变化行为的因素。发现在有效扩散率和层厚度之间的指数函数,用于揭示孔隙结构演化的模式。

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