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Chemical composition and physical properties of filter fly ashes from eight grate-fired biomass combustion plants

查看全文 作　　者：Christof [1]Lanzerstorfer 高影响力作者 机构地区：[1]School of Engineering and Environmental Sciences, University of Applied Sciences Upper Austria高影响力机构 出　　处：《Journal of Environmental Sciences》索引2015年第27卷第4期,共7页高影响力期刊 摘　　要：For the handling, treatment and utilization of fly ash from biomass combustion its chemical composition and physical properties are important. In this study eight filter fly ashes from different grate-fired biomass combustion plants were investigated. In fly ash from straw combustion high concentrations of(K) were found, whereas in the fly ash from wood combustion the concentrations of Ca and Mg were higher. The average concentration of PO3-4was similar in both types of fly ashes. In all wood fly ashes some measured heavy metal concentrations were above the limits for utilization. The straw fly ashes were much less contaminated and can be utilized. For wood fly ash most parameters showed little variation, except from one fly ash where the dust pre-separator is in poor condition. The average values were: mass median diameter 4.3 ± 0.8 μm, spread of particle size distribution19 ± 11, particle density 2620 ± 80 kg/m3 and angle of repose 50°± 1°. The density of the straw fly ashes is lower(2260 ± 80 kg/m3) and the spread of the size distribution is higher(72 ± 24).For one straw combustion fly ash the values of the mass median diameter and the angle of repose were similar to the values of wood combustion fly ash, for the other straw fly ash the values differed considerably. While the particle size of this fly ash was much smaller,surprisingly the angle of repose was also lower. This can be attributed to the formation of small agglomerates in this fly ash, which were not disintegrated without a certain stress. 关 键 词：生物质燃烧 燃烧飞灰 燃烧设备 物理特性 化学成分 层燃 质量中值直径 过滤
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