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DILUTION EFFECTS IN NATURAL GAS MILD COMBUSTION

机译：天然气轻度燃烧的稀释作用

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The mild combustion conditions, i.e., high reactant preheating and dilution level, yield a high efficiency relying on an increase in thermal energy transfer and drastic reduction of pollutant emissions. In this work, an experimental characterization of methane oxidation in mild conditions was carried out in a simple laboratory-scale system as a function of dilution level, C/O ratio, and inlet temperature. The framework outlined by the experimental analyses underlines that extreme working conditions, very different from the ones used in traditional combustion processes, can lead to a very complex system behavior. Several thermokinetic regimes corresponding to static and dynamic conditions were recognized. An accurate characterization of the dynamic region was performed, identifying several temperature oscillation typologies. On the basis of the obtained results, the range of reliability of mild combustion processes were defined. It was pointed out that the range of dynamic behavior can be overcome by splitting the whole combustion process into two stages, where the first one evolves in diluted rich conditions.
机译：温和的燃烧条件，即高的反应物预热和稀释水平，依靠热能传递的增加和污染物排放的大幅度减少而产生高效率。在这项工作中，在一个简单的实验室规模的系统中根据稀释度，C / O比和入口温度对甲烷在温和条件下的氧化进行了实验表征。实验分析概述的框架强调，极端工作条件与传统燃烧过程中使用的极端不同，会导致非常复杂的系统行为。认识到对应于静态和动态条件的几种热动力学机制。对动态区域进行了准确的表征，确定了几种温度振荡类型。根据获得的结果，确定了轻度燃烧过程的可靠性范围。有人指出，可以通过将整个燃烧过程分为两个阶段来克服动态行为的范围，其中第一个阶段是在稀释的富油条件下演化的。

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