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首页> 外文期刊>Natural Gas Industry B >Combustion characteristics of porous media burners under various back pressures: An experimental study
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Combustion characteristics of porous media burners under various back pressures: An experimental study

机译：多孔介质燃烧器在不同背压下的燃烧特性：实验研究

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The porous media combustion technology is an effective solution to stable combustion and clean utilization of low heating value gas. For observing the combustion characteristics of porous media burners under various back pressures, investigating flame stability and figuring out the distribution laws of combustion gas flow and resistance loss, so as to achieve an optimized design and efficient operation of the devices, a bench of foamed ceramics porous media combustion devices was thus set up to test the cold-state resistance and hot-state combustion characteristic of burners in working conditions without back pressures and with two different back pressures. The following results are achieved from this experimental study. (1) The strong thermal reflux of porous media can preheat the premixed air effectively, so the flame can be kept stable easily, the combustion equivalent ratio of porous media burners is lower than that of traditional burners, and its pollutant content of flue gas is much lower than the national standard value. (2) The friction coefficient of foamed ceramics decreases with the increase of air flow rate, and its decreasing rate slows down gradually. (3) When the flow rate of air is low, viscosity is the dominant flow resistance, and the friction coefficient is in an inverse relation with the flow rate. (4) As the flow rate of air increases, inertia is the dominant flow resistance, and the friction coefficient is mainly influenced by the roughness and cracks of foamed ceramics. (5) After the introduction of secondary air, the minimum equivalent ratio of porous media burners gets much lower and its range of equivalent ratio is much larger than that of traditional burners.
机译：多孔介质燃烧技术是稳定燃烧和清洁利用低热值气体的有效解决方案。为了观察多孔介质燃烧器在各种背压下的燃烧特性，研究火焰稳定性并弄清燃烧气体流量和阻力损失的分布规律，从而实现设备的优化设计和高效运行，这是一种泡沫陶瓷台架。因此，建立了多孔介质燃烧装置，以测试燃烧器在无背压且有两种不同背压的工作条件下的冷态阻力和热态燃烧特性。从该实验研究中获得以下结果。 （1）多孔介质强烈的热回流能有效地对预混空气进行预热，使火焰易于保持稳定，多孔介质燃烧器的燃烧当量比低于传统燃烧器，其烟气中污染物含量为远低于国家标准值。 （2）泡沫陶瓷的摩擦系数随着空气流量的增加而减小，其减小率逐渐减小。 （3）当空气的流量低时，粘度是主要的流阻，并且摩擦系数与流量成反比。 （4）随着空气流量的增加，惯性是主要的流动阻力，摩擦系数主要受泡沫陶瓷的粗糙度和裂纹的影响。 （5）引入二次空气后，多孔介质燃烧器的最小当量比要低得多，并且当量比的范围要比传统燃烧器大得多。

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