煤热解气化过程中汞的形态转化和释放规律  

MERCURY SPECIATION AND VOLATILITY DURING COAL PYROLYSIS AND GASIFICATION

作　　者：李扬[1] 张军营[1] 何北惠[1] 赵永椿[1] 余琛[1] 王宗华[1] 郑楚光[1] 

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

出　　处：《工程热物理学报》2008年第10期1775-1779,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.40672098;No.50721005);国家重点基础研究发展规划资助项目(No.2004CB217704)

摘　　要：本文选用神府和兖州两种烟煤,在400～1000℃的温度范围内,采用程序升温热解反应装置进行了热解和气化实验.实验过程中根据Ontario-Hydro方法捕捉气态汞,采用QM201型原子荧光测汞仪测定汞含量,研究了煤中微量元素汞在热解气化过程中的形态分布和释放规律。结果表明,温度是影响煤中汞释放的主要因素,煤热解过程中气态汞主要以元素汞的形式存在,占气态总汞的64%以上;随着温度的升高和停留时间的延长,元素汞的百分比含量逐渐降低,二价汞的百分比含量逐渐升高.气化过程中,元素汞和二价汞的百分比含量在40%～60%之问变化.气化产生的元素汞占气态总汞的百分比含量低于热解;二价汞则相反。Mercury speciation and volatility in Shenfu and Yanzhou bituminous coal during pyrolysis and gasification were studied. The experiments were carried out in tube furnace at 400-1000℃. The mercury in coal and gas flue was analyzed by atom fluorescence mercury meter according to Ontario Hydro Method. The results show that Hg emission apparently depended on the temperature. Hg°（g） is the dominant species which is more than 64%, during pyrolysis. High temperature and long time have advantages for the decrease of Hg° and the increase of Hg^2＋. The percentage of Hg° and Hg^2＋ vary between 40%-60% during coal gasification. The percentage of Hg° during gasification is smaller than pyrolysis： contrarily, Hg^2＋ is larger.

关 键 词：汞 形态 热解 气化 煤 

分 类 号：TK16[动力工程及工程热物理—热能工程]