化工学报Issue(11)：4643-4651,9.DOI:10.11949/j.issn.0438-1157.20150486
温度和赋存形态对燃煤过程中砷迁移和释放的影响
Effect of temperature and occurrence form of arsenic on its migration and volatilization during coal combustion
摘要
Abstract
Migration and volatilization features of arsenic in combustion processes for six coal samples selected from three different ranks were studied in a horizontal tube furnace at various temperature ranges. The mass change of arsenic in the combustion process was tracked and analyzed using the instruments and theoretical method of thermal analysis (TG/DTG) and coal analysis for these selected coal samples. The curves of arsenic mass loss and its rate were obtained by fitting these experimental results. The occurrence form of arsenic in the coals and corresponding ashes was determined by using a sequential chemical leaching method. The experimental results show that arsenic volatility and the releasing proportion increase with temperature, and the proportions varied from 30% to 67% at 1100℃. The mass loss rate of arsenic varies for different temperature regions, and a peak value of arsenic loss rate is observed at 800—900℃, mainly due to decomposition/oxidation of arsenic in sulfide form. Furthermore, lignite shows the highest mass loss ratio and rate of arsenic under the same temperature, followed by bituminous coals and anthracite. With temperature increases, organic arsenic volatiles easily into gas phase, and the interaction between acid-soluble and residual arsenic makes them migrate mainly into gas phase, and only a small part is transferred to its exchangeable form.关键词
煤燃烧/砷的释放/温度/赋存形态/实验验证/数值分析Key words
coal combustion/arsenic volatilization/temperature/mode of occurrence/experimental validation/numerical analysis分类
资源环境引用本文复制引用
刘慧敏,王春波,张月,孙喆,邵欢..温度和赋存形态对燃煤过程中砷迁移和释放的影响[J].化工学报,2015,(11):4643-4651,9.基金项目
国家高技术研究发展计划项目（2013AA065404）；中央高校基本科研业务费专项资金资助（2015XS115）。@@@@supported by the National High Technology Research and Development Program of China (2013AA065404) and the Fundamental Research Funds for the Central Universities (2015XS115) （2013AA065404）
