温度和赋存形态对燃煤过程中砷迁移和释放的影响

doi:10.11949/j.issn.0438-1157.20150486

化工学报 ›› 2015, Vol. 66 ›› Issue (11): 4643-4651.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

刘慧敏, 王春波, 张月, 孙喆, 邵欢

华北电力大学能源动力与机械工程学院, 北京 102206

收稿日期:2015-04-16 修回日期:2015-06-09 出版日期:2015-11-05 发布日期:2015-11-05
通讯作者: 刘慧敏
基金资助:
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)

Effect of temperature and occurrence form of arsenic on its migration and volatilization during coal combustion

LIU Huimin, WANG Chunbo, ZHANG Yue, SUN Zhe, SHAO Huan

Department of Energy Power &Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Received:2015-04-16 Revised:2015-06-09 Online:2015-11-05 Published:2015-11-05
Supported by:
supported by the National High Technology Research and Development Program of China (2013AA065404) and the Fundamental Research Funds for the Central Universities (2015XS115).

摘要/Abstract

摘要：

选取3个煤阶共6个国内典型煤种,利用水平管式炉在不同温度下进行煤的燃烧实验,研究燃煤过程中砷的迁移和释放特性。利用热分析的相关理论和方法,将煤的热重分析手段运用于煤燃烧过程中砷的质量变化,通过对实验结果进行拟合得到砷的失重曲线和失重速率曲线,并采用逐级化学提取的方法对原煤及不同温度下煤灰中砷的赋存形态进行分析。25～1100℃的实验结果表明:随着温度升高,煤中砷的释放比例逐渐增大,1100℃下砷的释放比例变化范围为30%～67%。不同温度区间下砷的失重速率存在差异,800～900℃区间出现显著的砷失重峰,主要原因是以硫化物形式存在的砷在800～900℃区间发生剧烈的分解/氧化分解。此外,相同温度下褐煤的失重比例和失重速率较大,无烟煤的失重比例和失重速率较小,烟煤则介于无烟煤和褐煤之间。温度升高后,煤中的有机物结合态砷向气相迁移,酸溶态砷和残渣态砷共同作用,减少的砷主要进入气相中,还有一部分向可交换态砷迁移。

关键词: 煤燃烧, 砷的释放, 温度, 赋存形态, 实验验证, 数值分析

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.

Key words: coal combustion, arsenic volatilization, temperature, mode of occurrence, experimental validation, numerical analysis

中图分类号:

X511

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, 66(11): 4643-4651.

LIU Huimin, WANG Chunbo, ZHANG Yue, SUN Zhe, SHAO Huan. Effect of temperature and occurrence form of arsenic on its migration and volatilization during coal combustion[J]. CIESC Journal, 2015, 66(11): 4643-4651.

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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

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