气化条件下灰的熔融行为及矿物质演变规律  

ASH MELTING BEHAVIOR AND MINERAL TRANSITION MECHANISM UNDER GASIFICATION CONDITION

作　　者：乌晓江[1,2] 张忠孝[1] 周托[3] 陈玉爽[3] 樊俊杰[3] 徐雪元 刘建斌 郑海英 

机构地区：[1]上海交通大学机械与动力学院,上海市闵行区200240 [2]上海电气电站集团,上海市闵行区201100 [3]上海理工大学动力工程学院,上海市杨浦区200093

出　　处：《工程热物理学报》2010年第9期1590-1594,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(NSFC,No.50906055);中国博士后科学基金项目(CPSF,No.20090450571)

摘　　要：本文利用XRD、SEM等测试手段,采用配气技术实验研究了高温气化条件下(29.9%H_2,66.2%CO,3.9%CO_2)高、低灰熔点煤灰及其混煤灰的熔融行为及矿物质演变规律。研究表明:气化条件下高灰熔点煤A含有较多的高岭石和石英,随着温度的升高,莫来石开始逐渐形成(>960℃),当温度达到1300℃时煤灰A中的结晶矿物全部为莫来石;低灰熔点煤B含有较多的硬石膏和方解石,随着温度的升高,900～1200℃开始生成大量的钙长石、铁橄榄石、铁铝榴石等低熔矿物,在1300℃时煤灰B中的结晶矿物全部熔融;高温气化条件下,混煤灰A/B的熔融温度变化与其三元相图上相应的液相线温度具有良好的相似性,当混煤灰A/B的主要化学成分位于三元相图的二元共晶线或低熔融共晶点附近时熔融温度最低。The melting behavior and mineral transition mechanism of typical high and low ash fusion temperature （AFT） coals and their blending coals under a simulate gasification condition （29.9% H2, 66.2% CO, 3.9% CO2） were studied using XRD, SEM. The results show that the high content of kaolinite and quartz in high AFT coal A will cause the generation of mullite during heat process. Mullite is formed and increased with increasing temperature when temperature is higher than 960℃. When temperature rises to 1300℃, mullite is the dominant and single crystalline phase in ash A; the high content of anhydrite and calcite in low AFT coal B will cause the generation of anorthite, fayalite and almandite during heat process between 900℃ and 1200℃. All minerals in ash B were molten when temperature reaches 1300℃, the trends of AFTs of blended ash A/B mirrored by changes in liquidus temperature fi＇om ternary phase diagrams systems. The blended ash A/B whose main chemical composition is located near the boundaries between mineral regions or triple points has the lowest fusion temperature.

关 键 词：灰熔融特性 矿物质 煤气化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]