【摘要】 本文首先运用热平衡分析法对不同气氛下三种煤样的燃烧系统中As,Se物质的分布及含量进行了预报,并以此来指导实验方案的设计,最后,进行相应的实验研究,来探究燃煤过程中As,Se的挥发行为特性。从研究结果我们可以得出: (1)As,Se的挥发量都随着温度的升高而增加,并且Se的挥发百分比要比As要大。(2)在氮气气氛下,As挥发量大幅提升的现象发生在600-900℃这一温度范围,而Se的大量挥发现象比As要早,大约在200-600℃的温度范围内。 (3)氧化性气氛有助于As,Se在更低的温度下的挥发。 (4)SO2在某一温度范围内对于两种痕量元素的挥发有微弱的促进作用。更多还原

【Abstract】 The partitioning of As and Se species in three different coal combustion systems were predicted by equilibrium analysis. Then the experimental research on volatilization behaviour of As and Se was conducted. Finally, the following conclusions can be drawn: (1) The percentage of volatilization of As and Se increased with the increase of the reaction temperature, meanwhile the amount of volatilization of Se was more larger than that of As under same temperature. (2) Under nitrogen condition, the amount of volatilization of As increased rapidly at the temperature of 600-900℃ while Se at 200-600℃. (3) The oxidizing condition was favorable for the volatilization of As and Se under more lower temperature. (4) SO2 also can improve the volatilization of As and Se.更多还原