铝基矿物在钙基固硫过程中的固相反应机理分析  

SOLID STATE REACTION MECHANISM OF ALUMINIFEROUS MINERAL IN THE PROCESS OF Ca-BASED SORBENTS DESULFURIZATION

作　　者：刘豪[1] 邱建荣[1] 谢峻林[2] 曾汉才[1] 孔凡海[1] 成斌[1] 谢长生[3] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074 [2]武汉理工大学材料科学与工程学院,湖北武汉430070 [3]华中科技大学材料科学与工程学院,湖北武汉430074

出　　处：《工程热物理学报》2007年第2期351-353,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学重点基金(No;90410017);国家自然科学基金(No.50176015);高校青年教师奖(2001)

摘　　要：在高温电阻炉中对高硫煤掺入钙铝基添加剂后进行燃烧试验,分析了不同条件下煤中加入添加剂后固硫效率、固硫灰渣的矿物组成及微观形貌的变化特性；综合采用TG-FTIR-XRD研究了化学纯矿物CaO-Al_2O_3-CaSO_4体系中硫酸钙的高温热分解过程及产物组成。结果表明,Al_2O_3的加入通过固相反应来影响钙基固硫效率,Al_2O_3对固硫效率的影响并非呈单一性；低温下生成Ca-Al酸盐矿物削弱了固硫反应,而高温下CaSO_4与灰中生成的含Ca、Al类矿物反应形成高温固硫物相硫铝酸钙并抑制其分解则提高了钙基固硫效率。Desulfurization efficiency as well as mineral composition and microstructure of desulfurization residues were investigated when cofiring high-sulfur coal and Ca-Al based additives in a high- temperature electric resistance furnace, while the decomposition of CaSO4 and products composition of pure mineral system CaO-Al2O3-CaSO4 were studied by means of TG-FTIR-XRD. The experimental results show that Al2O3 has dual effects on Ca-based desulfurization efficiency through solid state reaction; the formation of calcium aluminate at low temperature inhibits desulfurization reaction, but the formation of calcium sulphoaluminate at high temperature improves the desulfurization efficiency.

关 键 词：燃煤 高温固硫 固相反应 钙铝基添加剂 

分 类 号：TQ534[化学工程—煤化学工程]