Technical University of Crete, Department of Mineral Resources Engineering, University Campus, Akrotiri, 73100 Chania, Greece.
J Hazard Mater. 2011 Jan 30;185(2-3):1012-8. doi: 10.1016/j.jhazmat.2010.10.006. Epub 2010 Oct 28.
Slagging and fouling deposits from a pulverized lignite fired steam generating unit of the Kardia power plant (West Macedonia, Greece) were mineralogically investigated. The structure and cohesion of these deposits varied, usually depending on the level height of the boiler unit where they were formed. Some of the deposits had complex phase composition. The dominant components of the deposits of the burner zone and of the lower and intermediate boiler zones were the amorphous, anhydrite and hematite, while those of the highest levels contained amorphous, and anhydrite. Furthermore, in deposits formed in various other boiler areas gehlenite, anorthite, diopside, quartz, Ca(2)SiO(4), brownmillerite and other crystalline phases were also identified, usually in low amounts or in traces. The major part of the phases constituting the deposits were formed in the boiler, since only a minor part derived from the unreacted minerals present in lignite. Anhydrite was generated from the reaction of SO(2) with CaO formed mainly by the calcination of calcite as well as from dehydration of gypsum contained in lignite, while hematite was produced mainly from the oxidation of pyrite. The calcium-containing silicates formed in the boiler were mainly the products of reactions between CaO and minerals contained in the lignite.
对卡迪亚发电厂（希腊西马其顿）煤粉蒸汽发生装置的结渣和积垢沉积物进行了矿物学研究。这些沉积物的结构和内聚力通常取决于它们形成的锅炉装置的高度，存在差异。一些沉积物具有复杂的相组成。燃烧器区和下部及中部锅炉区沉积物的主要成分是无定形物、硬石膏和赤铁矿，而最高层的沉积物则含有无定形物和硬石膏。此外，在各种其他锅炉区域形成的沉积物中，还鉴定出了钙长石、钙长石、透辉石、石英、Ca(2)SiO(4)、棕柱石和其他结晶相，通常含量较低或痕量。构成沉积物的主要部分是在锅炉中形成的，因为只有一小部分来自未反应的褐煤中存在的矿物质。硬石膏是由 SO(2)与主要由方解石煅烧形成的 CaO 反应生成的，也是由褐煤中所含石膏脱水生成的，而赤铁矿主要是由黄铁矿氧化生成的。锅炉中形成的含钙硅酸盐主要是 CaO 与褐煤中所含矿物质之间反应的产物。
