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首页> 外文期刊>Energy & fuels >Volatilization of Arsenic During Coal Combustion Based on Isothermal Thermogravimetric Analysis at 600-1500 degrees C
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Volatilization of Arsenic During Coal Combustion Based on Isothermal Thermogravimetric Analysis at 600-1500 degrees C

机译：基于600-1500℃等温热重分析的煤燃烧中砷的挥发。

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摘要

The volatilization characteristics of arsenic in different coals at 600-1500 degrees C were studied on an isothermal reaction system. Through thermogravimetric analysis similar to that used for coal analysis, the mass loss and mass loss rate of arsenic for coal samples were determined. Sequential chemical extraction method was used to measure the mode of occurrence of arsenic in the coals. TG-MS techniques were also carried out to study the relationship between sulfur and arsenic. Results show that the volatilization proportion of arsenic increases with temperature and 53-99% of the total arsenic in coal is vaporized in the combustion zone at PC conditions (1500 degrees C). Coals with higher arsenic concentrations (As > 4 mu g/g) tend to have larger arsenic volatility proportions than coals with lower arsenic concentrations (As < 4 mu g/g) at a given temperature. In addition, three volatility zones with two mass loss rate peaks of arsenic are observed in all coals during coal combustion. Before 600 degrees C, the evaporation of organic-bound arsenic dominates; then the first arsenic mass loss peak at 800-900 degrees C is mainly from the decomposition or oxidation of arsenic in sulfide forms. The second peak after 1000 degrees C is probably generated through the decomposition of arsenates. For As > 4 mu g/g coals, the first peak is higher than the second peak due to the larger proportion of sulfide-bound arsenic, while the second mass loss peak of arsenic is higher in As < 4 mu g/g coals due to the larger proportion of arsenates. Furthermore, thermodynamic analysis by HSC chemistry6.0 software were carried out to prove that arsenates, like Ca-3(AsO4)(2), FeAsO4, and Mg-3(AsO4)(2), are thermally stable and could only decompose at relatively high temperatures.
机译：在等温反应体系上研究了砷在600-1500℃下在不同煤中的挥发特征。通过类似于煤分析的热重分析，确定了煤样品中砷的质量损失和质量损失率。采用顺序化学萃取法测定了煤中砷的赋存方式。还进行了TG-MS技术研究硫与砷之间的关系。结果表明，在PC条件（1500摄氏度）下，燃烧区中砷的挥发比例随温度升高而增加，煤中总砷的53-99％蒸发。在给定温度下，砷浓度较高（As> 4μg / g）的煤比砷浓度较低（As <4μg / g）的煤具有更大的砷挥发性比例。此外，在煤燃烧过程中，在所有煤中均观察到三个具有两个质量损失率峰值的砷的挥发性区域。在600摄氏度之前，有机结合的砷的蒸发占主导地位。那么在800-900摄氏度时第一个砷的质量损失峰主要来自硫化物形式的砷的分解或氧化。 1000摄氏度之后的第二个峰可能是由于砷酸盐的分解而产生的。对于As> 4μg / g煤，由于硫化物结合的砷比例较大，因此第一个峰比第二个峰高，而由于<4μg / g煤，砷的第二个质量损失峰较高。到更大比例的砷酸盐。此外，通过HSC chemistry6.0软件进行的热力学分析证明，砷化物，如Ca-3（AsO4）（2），FeAsO4和Mg-3（AsO4）（2），是热稳定的，仅能在60℃分解。相对较高的温度。

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  • 来源
    《Energy & fuels》 |2016年第8期|6790-6798|共9页
  • 作者

    Liu Huimin; Pan Wei-Ping; Wang Chunbo; Zhang Yue;

  • 作者单位

    North China Elect Power Univ, Dept Energy Power & Mech Engn, Beijing 102206, Peoples R China;

    North China Elect Power Univ, Dept Energy Power & Mech Engn, Beijing 102206, Peoples R China|Western Kentucky Univ, Inst Combust Sci & Environm Technol, Bowling Green, KY 42101 USA;

    North China Elect Power Univ, Dept Energy Power & Mech Engn, Beijing 102206, Peoples R China;

    North China Elect Power Univ, Dept Energy Power & Mech Engn, Beijing 102206, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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