TRANSPORTATION AND HETEROGENEOUS REACTIONS OF CALCIUM CONTAINING MINERALS IN COAL COMBUSTION SOLID RESIDUES
TRANSPORTATION AND HETEROGENEOUS REACTIONS OF CALCIUM CONTAINING MINERALS IN COAL COMBUSTION SOLID RESIDUES
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发表时间：
2005
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通讯作者：
Zhang Xiao-ping
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作者：
Zhang Xiao-ping
煤燃烧固体残渣的活性与钙矿物的组成和反应密切相关。本文采用x射线粉末衍射法对单燃烧器炉内燃烧煤和助剂时的固体残留物进行了分析，并利用F* a *C*T计算机程序包对含煤和助剂的多组分体系的产物组成进行了预测。研究了不同条件下固体残渣的矿物组成。结果表明，钙矿物的反应主要有两种类型：脱硫反应和固相反应。固相反应生成的钙矿物包括CaO-SiO2、CaO-Al2O3、CaO-Fe2O3和CaO-SiO2- al2o3基团矿物。随着灰分中CaO含量的增加，产品中的主要矿物呈现莫来石→钙长石→辉长石→硅酸二钙的变化规律。当CaSO4稳定时，脱硫先于固相反应。由于CaSO4在高温下分解或进一步反应，大部分钙进入硅酸盐矿物中，可得到复杂的含s矿物，如硫酸铝钙和硫酸硅钙。
Activity of coal combustion solid residues is relevant closely to calcic minerals composition and reactions. In this paper, the solid residues were analyzed by X-ray powder diffraction when firing coal and additives in a single burner furnace, moreover, the computer package F*A*C*T was used to predict the products composition of the multi-component system containing coal and additives. The mineral composition of solid residues under different conditions has been well investigated. The results indicate that there are two types of reactions with respect to calcic minerals: desulfurization and solid state reaction. The calcic minerals generating from solid state reactions include CaO-SiO2, CaO-Al2O3, CaO-Fe2O3 and CaO-SiO2-Al2O3 group minerals. When increasing CaO content in ash, the primary mineral in the products varied following the route of mullite→anorthite→gehlenite→dicalcium silicate. Desulfurization is prior to solid state reaction when CaSO4 is stable. Due to the decomposition or further reactions of CaSO4 at high temperature, most calcium enters in silicate minerals and complicated S-containing minerals such as calcium aluminosulfate and calcium silicosulfate can be obtained.