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Influence of fuel ash composition on high temperature aerosol formation in fixed bed combustion of woody biomass pellets

机译：木质生物质颗粒固定床燃烧中燃料灰分组成对高温气溶胶形成的影响

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摘要

In this work, the influence of fuel ash composition on high temperature aerosol formation during fixed bed combustion of woody biomass (two wood pellets and one bark pellets) were investigated experimentally in a laboratory reactor and theoretically through chemical equilibrium model calculations. For all fuels, the particle mass size distribution in the PM_(2.5) region was bimodal, with one fine mode and one coarse mode. Early in the flame, the fine mode was dominated by particles from incomplete combustion and these particles were rapidly oxidised in the post flame zone. After the hot flame, the fine mode concentration and the particle diameter increases gradually when the temperature decreases due to condensation of vaporised inorganic matter, K, Na, S, Cl, and Zn. For two of the fuels also P could be found in the fine particles. The coarse mode consisted of carbon, refractory metals and considerable amount of alkali. Further, the initial fuel alkali concentration and the alkali to silicon ratio (K + Na)/Si influenced the amount of vaporised aerosol forming alkali matter. Finally, the present study shows that, combustion temperature and fuel ash composition is of major importance for the formation of high temperature aerosols in fixed bed combustion of woody biomass pellets.
机译：在这项工作中，在实验室反应器中实验研究了燃料灰分组成对木质生物质（两个木质颗粒和一个树皮颗粒）固定床燃烧过程中高温气溶胶形成的影响，并通过化学平衡模型计算从理论上进行了研究。对于所有燃料，PM_（2.5）区域中的粒径分布是双峰的，具有一种精细模式和一种粗糙模式。在火焰的早期，精细模式主要由不完全燃烧产生的颗粒所控制，这些颗粒在火焰后区迅速被氧化。热火焰之后，由于蒸发的无机物，K，Na，S，Cl和Zn的凝结而温度降低时，细模浓度和粒径逐渐增加。对于两种燃料，在细颗粒中也可以找到P。粗模式由碳，难熔金属和大量碱组成。此外，燃料的初始碱浓度和碱硅比（K + Na）/ Si影响了形成碱物质的气溶胶的蒸发量。最后，本研究表明，燃烧温度和燃料灰分组成对于木质生物质颗粒固定床燃烧中高温气溶胶的形成至关重要。

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