宝钢活性石灰回转窑结圈机理研究

Study on ring formation mechanism in active lime rotary kiln of Bao-steel

为了揭示宝钢石灰回转窑结圈机理,通过湿化学分析、X-射线衍射分析和扫描电子显微镜观察等手段分析了窑皮的化学组成、相组成和显微结构。高温模拟实验揭示:结圈形成条件是低熔物作为黏结相,煤燃烧后的灰分与氧化钙反应生成低熔点氧化物,这些低熔点氧化物黏结氧化钙,随着该过程进行,结圈物变厚。煤中灰分在高温下形成液相是燃煤石灰回转窑结圈的关键。

In order to reveal the ring formation mechanism in the active lime rotary kiln of Bao-steel,the chemical composition,phase composition and microstructure of the ring are analyzed by wet chemical analysis,X-ray diffraction analysis and electronic scanning microscope.The high temperature simulation experiment reveals that the conditions for the ring formation are that low melting point matter functions as binding phase and the ash after coal burning reacts with calcium oxide to form low melting point oxides,these low melting point oxides stick to calcium oxides and the matters on the ring become thicker with the process progress.The liquid phase formation of the ash in coal under high temperature is the key problem for the ring formation in the active lime rotary kiln fired with coal.