高温固硫物相的研究  

Research on behavior of sulfation product at high temperature

作　　者：李宁[1] 周俊虎[2] 岑可法[2] 

机构地区：[1]浙江大学化学系,浙江杭州310027 [2]能源清洁利用与环境工程教育部重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2003年第5期612-616,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家重点基础研究发展规划资助项目(G1999022204).

摘　　要：通过ZCS智能定硫仪动态实验系统,研究了α-CaSO4、β-CaSO4、γ-CaSO4三种形态的热稳定性、CaSO4在CO气氛下的还原再分解反应及CaSO4与炭的还原反应,指出CaSO4在煤实际燃烧中不能稳定存在的主要原因是还原和热分解的双重影响所致.X-射线粉末衍射试验(XRD)研究表明,CaSO4在高温中与煤中所含矿物质发生反应生成3CaO·Al2O3·3CaSO4和2Ca2SiO4·CaSO4的复合物,前者在1593K高温下的分解率仅为38%,这为开发高效的煤高温燃烧脱硫剂提供了依据.The thermal stability of α-CaSO4, β-CaSO4, γ-CaSO4 and the chemical reactivity of CaSO4 with CO or C at high temperature were studied by ZCS intelligent sulfur determination analyzer. The results showed that the reduction reaction and the thermal decomposition of CaSO4 resulted in instability of CaSO4 during coal combustion. X-ray powder diffraction (XRPD) characterized the coal residue and showed that the compound molecule Ca5(SiO4)2SO4 was synthesized. When CaSO4 was mixed with some minerals existing in coal and heated in air at 1593 K, only 38% of CaSO4 decomposed. This implied a potential new sorbent for improving the sulfur capture efficiency during coal combustion in furnace.

关 键 词：煤高温燃烧 脱硫剂 二氧化硫 环境保护 热稳定性 CASO4 还原反应 热分解 高温固硫物相 

分 类 号：TQ534.9[化学工程—煤化学工程]