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不同燃烧温度下煤中铬迁移和释放特性

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李立园, 汤泉, 郑刘根, 刘旭, 储安心. 不同燃烧温度下煤中铬迁移和释放特性[J]. 环境化学, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
引用本文: 李立园, 汤泉, 郑刘根, 刘旭, 储安心. 不同燃烧温度下煤中铬迁移和释放特性[J]. 环境化学, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
shu
LI Liyuan, TANG Quan, ZHENG Liugen, LIU Xu, CHU Anxin. Migration and volatilization of chromium in coal under different combustion temperatures[J]. Environmental Chemistry, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
Citation: LI Liyuan, TANG Quan, ZHENG Liugen, LIU Xu, CHU Anxin. Migration and volatilization of chromium in coal under different combustion temperatures[J]. Environmental Chemistry, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
shu

不同燃烧温度下煤中铬迁移和释放特性

  • 1.

    安徽大学资源与环境工程学院, 矿山环境修复与湿地生态安全协同创新中心, 合肥, 230601;

  • 2.

    安徽大学生命科学学院, 合肥, 230601

  • 基金项目:

    安徽省自然科学基金（1608085QD79）和国家自然科学基金（41702176，41373108）资助.

Migration and volatilization of chromium in coal under different combustion temperatures

  • 1.

    School of Resource and Environmental Engineering, Collaborative Innovation Center for Mines Environmental Remediation and Wetland Ecological Security, Anhui University, Hefei, 230601, China;

  • 2.

    School of Life Science, Anhui University, Hefei, 230601, China

  • Fund Project: Supported by the Science and Technology Support Program of Anhui Provinces(1608085QD79) and the National Natural Science Foundation of China(41702176, 41373108).

  • 摘要: 煤燃烧过程中，铬会挥发到大气中，污染环境.选取淮北临涣煤，利用温控电阻炉在不同温度下进行室内燃烧实验，采用逐级提取方法分析原煤及燃烧产物中铬的赋存形态，研究不同燃烧温度下煤中铬的迁移和释放特性.结果表明，煤燃烧过程中铬的释放率基本随温度的升高而升高，且不同温度下铬的释放强度不同.铬在900℃后释放较快，主要是由于高温下铁锰氧化矿物中的铬发生剧烈的氧化分解，导致铬的释放.随着燃烧温度的升高，可交换态铬、碳酸盐结合态铬、铁锰氧化物结合态铬、有机物结合态铬和残渣态铬都发生了不同程度的迁移和转化，1000℃时，5种形态铬都出现了明显地减少，表明铬发生了从固相到气相的迁移.这一结论为研究煤中铬在燃烧过程中的迁移转化提供了一定的依据.
    Abstract: During coal combustion, chromium can be volatilized into atmosphere and contaminate the environments. Migration and volatilization of chromium during combustion of Linhuan coal samples were studied in a muffle roaster at various temperatures. The modes of occurrence of chromium in the coal and its ashes at different temperatures were determined using the chemical sequential extraction procedure. The experimental results showed that the volatilization rate of chromium increased with the increase of temperature, and the releasing intensity of chromium varied in different temperature regions. Chromium showed a strong volatilization when the temperature was higher than 900℃, mainly due to the decomposition/oxidation of chromium in Fe-Mn oxides minerals. Different trends were observed for various forms (exchangeable, carbonates, Fe-Mn oxides, organic matter and residual) of chromium during coal combustion. For the ash obtained at 1000℃, the proportions of chromium in five forms were all reduced, suggesting that these forms of chromium were transformed from the solid phase to the volatile phase. Our study provides a basis for understanding the transformation of chromium during coal combustion process.
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出版历程
  • 收稿日期:  2017-07-28
  • 刊出日期:  2018-03-15
李立园, 汤泉, 郑刘根, 刘旭, 储安心. 不同燃烧温度下煤中铬迁移和释放特性[J]. 环境化学, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
引用本文: 李立园, 汤泉, 郑刘根, 刘旭, 储安心. 不同燃烧温度下煤中铬迁移和释放特性[J]. 环境化学, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
shu
LI Liyuan, TANG Quan, ZHENG Liugen, LIU Xu, CHU Anxin. Migration and volatilization of chromium in coal under different combustion temperatures[J]. Environmental Chemistry, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
Citation: LI Liyuan, TANG Quan, ZHENG Liugen, LIU Xu, CHU Anxin. Migration and volatilization of chromium in coal under different combustion temperatures[J]. Environmental Chemistry, 2018, 37(3): 437-444. doi: 10.7524/j.issn.0254-6108.2017072801
shu

不同燃烧温度下煤中铬迁移和释放特性

  • 1.  安徽大学资源与环境工程学院, 矿山环境修复与湿地生态安全协同创新中心, 合肥, 230601;
  • 2.  安徽大学生命科学学院, 合肥, 230601
  • 收稿日期:  2017-07-28
基金项目:

安徽省自然科学基金（1608085QD79）和国家自然科学基金（41702176，41373108）资助.

摘要: 煤燃烧过程中，铬会挥发到大气中，污染环境.选取淮北临涣煤，利用温控电阻炉在不同温度下进行室内燃烧实验，采用逐级提取方法分析原煤及燃烧产物中铬的赋存形态，研究不同燃烧温度下煤中铬的迁移和释放特性.结果表明，煤燃烧过程中铬的释放率基本随温度的升高而升高，且不同温度下铬的释放强度不同.铬在900℃后释放较快，主要是由于高温下铁锰氧化矿物中的铬发生剧烈的氧化分解，导致铬的释放.随着燃烧温度的升高，可交换态铬、碳酸盐结合态铬、铁锰氧化物结合态铬、有机物结合态铬和残渣态铬都发生了不同程度的迁移和转化，1000℃时，5种形态铬都出现了明显地减少，表明铬发生了从固相到气相的迁移.这一结论为研究煤中铬在燃烧过程中的迁移转化提供了一定的依据.

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