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Effect of fuel properties on biomass combustion: Part I. Experiments-fuel type, equivalence ratio and particle size

机译：燃料性质对生物质燃烧的影响：第一部分。实验-燃料类型，当量比和粒径

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摘要

Moving bed combustion is commonly used for energy conversion of biomass. Conditions on the moving bed can be conveniently represented by a time dependent fixed bed. The present work experimentally investigates the combustion of four biomass materials having different fuel properties in a fixed bed under fuel-rich conditions. Temperature, gas composition and mass loss curves identified two distinct periods as the combustion progresses in the bed: the ignition propagation and char oxidation. The effects of bulk density, particle size and air flow rate on the combustion characteristics during the two periods are interpreted by using the ignition front speed, burning rate, percentage of mass loss, equivalence ratio and temperature gradient. Different channelling of air was observed for small miscanthus pellets and large wood particles due to the fast propagation of the ignition front around a channel. The elemental ash composition was also analysed, which explained the sintered agglomerates of miscanthus ashes in terms of alkali index.
机译：移动床燃烧通常用于生物质的能量转化。移动床的状况可以方便地用时间相关的固定床来表示。本工作实验性研究了富燃料条件下固定床中四种具有不同燃料特性的生物质材料的燃烧。温度，气体成分和质量损失曲线在床层燃烧过程中确定了两个不同的时期：点火传播和炭氧化。通过使用点火前沿速度，燃烧速率，质量损失百分比，当量比和温度梯度来解释这两个时期的堆积密度，粒度和空气流速对燃烧特性的影响。由于点火前沿通道的快速传播，对于小的桔梗颗粒和大的木材颗粒，观察到了不同的空气通道。还分析了元素灰分的组成，这从碱度指标上解释了桔梗灰的烧结附聚物。

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