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Characterization of unburned carbon from ash after bituminous coal and lignite combustion in CFBs

机译：CFB中烟煤和褐煤燃烧后灰分中未燃烧碳的特征

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摘要

This paper deals with the characterisation of carbon (UC) from bottom ash (BA) and fly ash (FA) samples from two fluidised-bed power stations burning bituminous coal and lignite. The laboratory results for the carbon determinations and its mass balances are evaluated. Chemical and mineral analyses and textural characteristics (specific surface area and pore-size distribution) are presented. Depletion/enrichment of selected elements (S, Cl, V, Cr, Ni, Cu, Zn, As, Se, Sb, Hg, and Pb) in carbon from the bottom ash are compared with both ash compostions. The strong positive relationships between the concentrations of some trace element contents (Hg, Se, As, Cu, Ni, V and Cl) in fly ash with the content of carbon and the specific surface area of FA are presented and expressed by regression equations with very high correlation coefficients. Laser ablation-ICP-MS has been used to obtain an insight into element distributions within carbon grains from the bottom ash.
机译：本文研究了来自两个燃烧烟煤和褐煤的流化床电站的底灰（BA）和飞灰（FA）样品中碳（UC）的表征。评估了测定碳及其质量平衡的实验室结果。介绍了化学和矿物分析以及结构特征（比表面积和孔径分布）。将来自底部灰分的碳中选定元素（S，Cl，V，Cr，Ni，Cu，Zn，As，Se，Sb，Hg和Pb）的消耗/富集与两种灰分堆肥进行了比较。用回归方程表示并表示了粉煤灰中某些微量元素的含量（Hg，Se，As，Cu，Ni，V和Cl）的浓度与碳含量和FA的比表面积之间的强正关系。相关系数非常高。激光烧蚀-ICP-MS已被用于深入研究底灰中碳晶粒内的元素分布。

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