Hendrik Mörtenkötter, Manas Kulkarni, Lennart Fuchs, Florian Kerscher, Sebastian Fendt, Hartmut Spliethoff
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The ash melting behavior is analyzed and the ash composition is determined by X-ray fluorescence analysis. A novel electrothermal evaporation unit connected to an inductively coupled plasma optical emission spectrometer is used to determine the temperature-resolved potassium release from the samples. The experimental data is compared to the most common fuel indices for the prediction of the slagging and fouling tendencies of biofuels.</p><p>Conflicting fuel suitability predictions are made by the fuel indices studied. Kaolin and coal fly ash shift the potassium release of miscanthus and torrefied wood by up to 300 °C and increase their ash stability. The additives do not improve the ash characteristics of beech wood. 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引用次数: 0
摘要
固体生物质燃烧过程中释放出的碱性化合物会导致微粒排放,并在热交换器表面形成沉积物。这些沉积物大大降低了生物质燃烧发电厂的效率和耐用性。细颗粒排放和沉积物形成的主要驱动因素是燃料中释放的钾含量。矿物吸附剂可使钾的释放行为和灰熔化温度显著升高。因此,进入气相的钾含量会减少,细颗粒和沉积物的形成也会减少。这项研究分析了高岭土和粉煤灰对钾释放行为和灰稳定性的影响。分析了灰熔化行为,并通过 X 射线荧光分析确定了灰成分。新型电热蒸发装置与电感耦合等离子体光发射光谱仪相连,用于测定样品的温度分辨钾释放量。实验数据与最常见的燃料指数进行了比较,以预测生物燃料的结渣和结垢倾向。高岭土和粉煤灰可使褐煤和香焦木的钾释放温度降低 300 °C,并提高其灰分稳定性。添加剂并不能改善榉木的灰烬特性。对不同方法的比较表明,在预测灰分相关问题和添加剂的影响方面,钾释放分析比燃料指数和灰熔分析更准确。
Effects of aluminosilicate-based additives on potassium release and ash melting during biomass combustion
The release of alkali compounds during the combustion of solid biomass causes fine particle emissions and deposition formation on heat exchanger surfaces. These depositions drastically reduce the efficiency and durability of biomass-fired power plants. The main driver of fine particle emissions and deposition formation is the released potassium content of the fuel. Mineral sorbents can shift the potassium release behavior and the ash melting towards significantly higher temperatures. As a result, less potassium enters the gas phase, and fine particle and deposition formation are reduced.
This work analyzes the effect of kaolin and coal fly ash on the potassium release behavior and ash stability of miscanthus, torrefied wood, and beech wood. The ash melting behavior is analyzed and the ash composition is determined by X-ray fluorescence analysis. A novel electrothermal evaporation unit connected to an inductively coupled plasma optical emission spectrometer is used to determine the temperature-resolved potassium release from the samples. The experimental data is compared to the most common fuel indices for the prediction of the slagging and fouling tendencies of biofuels.
Conflicting fuel suitability predictions are made by the fuel indices studied. Kaolin and coal fly ash shift the potassium release of miscanthus and torrefied wood by up to 300 °C and increase their ash stability. The additives do not improve the ash characteristics of beech wood. A comparison of the different methods shows that potassium release analysis is more accurate than fuel indices and ash melting analysis in predicting ash-related problems and the effect of additives.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.