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Simultaneous volatilization characteristics of arsenic and sulfur during isothermal coal combustion

机译：等温煤燃烧过程中砷和硫的同时挥发特性

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摘要

Six coals that with different rank and sulfur contents were chosen for the isothermal combustion experiments at 900 degrees C and 1300 degrees C. By changing the residence time, the volatilization ratio and rate of arsenic with time were obtained. Effects of residence time, temperature, coal type and sulfur content on arsenic volatilization characteristics were discussed. The emission concentration of SO2 was also obtained through online monitoring by flue gas analyzer. Furthermore, the curves of arsenic volatilization, SO2 emission and mass loss of coal were compared together to study the simultaneous volatilization characteristics of arsenic and sulfur. Results show that coals with higher sulfur content tend to have a larger proportion of sulfide bound arsenic, which could have a positive effect on arsenic volatilization. With the increase of residence time, the volatilization ratio of arsenic increases gradually with various volatilization rate. One volatilization peak of arsenic is observed for all the coals. The volatilization peak of arsenic moves forward with higher temperature and lower coal rank. The peak rate of arsenic increases with higher temperature while varies much in different coals. At 900 degrees C, coals with lower coal rank tend to have a higher peak rate of arsenic, while at 1300 degrees C, coals with larger proportion of sulfide bound arsenic tend to have a higher peak rate of arsenic. As for SO2, all the coals have one emission peak at 900 degrees C while two emission peaks at 1300 degrees C, which is similar to the mass loss characteristics of coals. The simultaneous releasing behavior of arsenic and sulfur is observed at 900 degrees C due to the moderate mass loss of coal and at 1300 degrees C due to the decomposition of As-bearing sulfides. (C) 2017 Elsevier Ltd. All rights reserved.
机译：选择了六种不同等级和硫含量的煤在900℃和1300℃下进行等温燃烧实验。通过改变停留时间，得到了挥发度和砷随时间的变化率。讨论了停留时间，温度，煤种和硫含量对砷挥发特性的影响。还通过烟气分析仪在线监测​​获得了二氧化硫的排放浓度。此外，还比较了砷的挥发，SO 2排放和煤的质量损失曲线，以研究砷和硫的同时挥发特性。结果表明，硫含量较高的煤往往具有较大比例的硫化物结合砷，这可能对砷的挥发有积极作用。随着停留时间的增加，砷的挥发比随着挥发速率的增加而逐渐增加。所有煤中都观察到一个砷的挥发峰。随着温度的升高和煤等级的降低，砷的挥发峰逐渐增加。砷的峰值速率随着温度的升高而增加，而不同的煤中的峰值差异很大。在900摄氏度时，煤级较低的煤倾向于具有较高的砷峰值速率，而在1300摄氏度时，具有硫化物结合砷的比例较大的煤倾向于具有较高的砷峰值速率。至于二氧化硫，所有煤在900摄氏度时都有一个排放峰，而在1300摄氏度时有两个排放峰，这与煤炭的质量损失特性相似。由于适度的煤质量损失，在900℃下观察到砷和硫的同时释放行为，而由于含As的硫化物的分解，在1300℃下观察到了砷和硫的同时释放行为。 （C）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Fuel》 |2017年第1期|152-161|共10页
  • 作者

    Liu Huimin; Wang Chunbo; Zou Chan; Zhang Yue; Wang Jiawei;

  • 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;

    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;

    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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Simultaneous volatilization; Arsenic; Sulfur; Isothermal coal combustion;

    机译：同时挥发;砷;硫;等温煤燃烧;

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