燃煤硫的析出和迁移特性及其对锅炉水冷壁高温腐蚀的影响  

Sulfur Release and Migration During Coal Combustion Process and the Influence on High-temperature Corrosion of Boiler Water Walls

作　　者：薛康[1] 赵钦新[1] 李婷[1] 祁秋娜[1] 

机构地区：[1]西安交通大学能源与动力工程学院锅炉研究所,陕西710049

出　　处：《动力工程》2009年第9期868-874,共7页Power Engineering

基　　金："十一五"国家科技支撑计划课题资助项目(2006BAK02B03)

摘　　要：利用具有滴管炉和固定床特点的试验反应系统,研究了3种典型原煤样品在热解和燃烧过程中硫的析出和迁移特性,得到煤种、温度、升温模式和过量空气系数对硫析出特性的影响规律.通过煤粉燃烧模拟电站锅炉烟气气氛,研究了硫及其化合物对水冷壁管高温腐蚀的影响.对腐蚀试样表面的微观分析表明:温度越高、过量空气系数越小,腐蚀试样表面氧化皮越厚;随着温度升高,气相含硫产物转化率提高.Making use of an experimental system, which combines features of drop-tube furnace and fixed bed, sulfur release and migration characteristics of three typical coal samples during pyrolysis and combustion process were studied, while the law, how coal category, temperature, heat-up pattern and excess air coefficient influence the sulfur release characteristics, obtained. By simulating flue gas atmosphere of power plant boilers, the high-temperature corrosion influence of sulfur and sulfide on water wall tubes was analyzed. Results of micro-analysis on corroded surface of test samples show that the higher the temperature, the smaller the excess air coefficient, the thicker the oxide scale will be; with the rise of temperature, more gaseous-state sulfur-containing compounds will be generated.

关 键 词：热解 燃烧 硫的析出和迁移特性 高温腐蚀 锅炉水冷壁 

分 类 号：TQ533[化学工程—煤化学工程] TK224.9[动力工程及工程热物理—动力机械及工程]