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Temporal Variation in the Compositional and Thermal Characteristics of Greek Lignite Bottom Ash Samples

机译：希腊褐煤底灰样品的组成和热特性的时间变化

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Bottom ash samples were collected during four seasons from the largest lignite-fired power plant of Greece, named Agios Dimitrios. Dry sieving and particle size analysis were performed for all samples. Coarse fractions were initially examined by a stereo-microscope. Four fractions (1.25, 0.63-1.25, 0.18-0.63, 0.18 mm) of each sample were created after homogenization and ground for analytical purposes. Thermogravimetry (TG/DTG), X-Ray Diffraction (XRD) and Energy Dispersive System (EDS) methods and proximate analysis were applied, along with the determination of Loss on Ignition (LOI) and calorific values. The mineral composition included mainly amorphous matter, quartz, plagioclase, calcite, gehlenite and micas and minor amounts of gypsum, anhydrite, portlandite, hematite, larnite, lime etc. The chemical analysis showed Si, Ca, and Al as major and Mg, Fe, S and K as minor chemical elements, indicating medium slagging and high fouling potential within the thermal chambers. Based on the analytical results, a potential utilization in concrete manufacturing is discussed. High amounts of unburnt carbon were determined in the coarse fractions (1.25 mm) of all samples, indicating a problematic combustion within the chambers and a potential of reburning these coarse material in a waste to energy application.
机译：在来自希腊最大的褐煤发电厂的四季中收集底部灰分样品，名为Agios Dimitroios。对所有样品进行干筛和粒度分析。最初通过立体显微镜检查粗级分。在均质化和地面以分析目的后，产生每个样品的四个级分（＆ 1.25,0.63-1.25,0.18-0.63，0.18 mm）。施加热重滴定法（TG / DTG），X射线衍射（XRD）和能量分散系统（EDS）方法以及近期分析以及测定点火（LOI）和热值的损失。矿物质组合物主要包括无定形物质，石英，普发基酶，方解石，胶质石和云母和少量石膏，卤石，波特兰石，赤铁矿，大豆，石灰等。化学分析显示Si，Ca和Al作为主要和Mg，Fe ，S和K作为次要化学元素，在热室内表示介质粘连和高污垢电位。基于分析结果，讨论了具体制造中的潜在利用。在所有样品的粗级分（＆ 1.25mm）中测定大量的未燃烧碳，表明腔室内的有问题的燃烧以及在废物中储存这些粗材料的潜力。

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