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李晓航, 滕阳, 王鹏程, 李丽锋, 张锴. 燃煤电站CFB锅炉飞灰热处理中汞释放特性[J]. 环境化学, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
引用本文: 李晓航, 滕阳, 王鹏程, 李丽锋, 张锴. 燃煤电站CFB锅炉飞灰热处理中汞释放特性[J]. 环境化学, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
shu
LI Xiaohang, TENG Yang, WANG Pengcheng, LI Lifeng, ZHANG Kai. Release characteristics of mercury in fly ashes collected from coal-fired CFB power units during thermal treatment[J]. Environmental Chemistry, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
Citation: LI Xiaohang, TENG Yang, WANG Pengcheng, LI Lifeng, ZHANG Kai. Release characteristics of mercury in fly ashes collected from coal-fired CFB power units during thermal treatment[J]. Environmental Chemistry, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
shu

燃煤电站CFB锅炉飞灰热处理中汞释放特性

  • 1. 华北电力大学热电生产过程污染物监测与控制北京市重点实验室, 北京, 102206;

  • 2. 山西河坡发电有限责任公司, 阳泉, 045011

    • 通讯作者: 张锴, E-mail: kzhang@ncepu.edu.cn
  • 基金项目:

    国家自然科学基金（U1610254），山西省重大专项（MD2015-01）和中央高效基本业务费（2017MS020）资助.

Release characteristics of mercury in fly ashes collected from coal-fired CFB power units during thermal treatment

  • 1. Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing, 102206, China;

  • 2. Shanxi Hepo Power Generation Company Limited, Yangquan, 045011, China

    • Corresponding author: ZHANG Kai, kzhang@ncepu.edu.cn
  • Fund Project: Supported by the National Natural Science Foundation of China (U1610254), Major Special Project of Shanxi Province (MD2015-01) and Fundamental Research Funds for the Central Universities (2017MS020).

  • 摘要: 为考察循环流化床锅炉飞灰的汞释放特性，本文以某循环流化床CFB锅炉燃煤发电机组飞灰为样品，通过热处理实验和程序升温热解实验考察温度和时间对飞灰样品汞释放特性的影响以及热处理前后飞灰中汞的种类及其释放规律，并结合一级动力学方程、Elovich动力学方程、Freundlich动力学方程和抛物线扩散动力学方程对该过程进行具体分析.热处理实验结果表明，飞灰汞释放速率与热处理的温度和时间密切相关.温度为200℃以下时飞灰中汞的释放率最大不超过0.2，当温度达到300℃以上时，飞灰中汞的释放率不低于0.935.程序升温热解实验表明，飞灰中汞化合物种类包括HgCl2、Hg2Cl2、HgO、HgSO4、HgS（黑）和HgS（红），其中HgS（黑）和HgS（红）是飞灰中汞的主要赋存形态.动力学方程拟合结果表明，Elovic动力学方程适用于描述飞灰汞释放过程，各实验条件下拟合值与实验值的相关系数R2均大于0.95，这说明该过程受多个反应机制控制且反应中活化能变化较大.
    Abstract: In order to investigate release characteristics of mercury in fly ashes collected from a coal-fired CFB power unit, the effect of temperature and time on mercury release characteristics of fly ash samples as well as release rules of mercury in fly ash samples were analyzed through the heat treatment experiments and temperature-programmed pyrolysis experiments. Moreover, the mechanism of mercury adsorption was examined based on the fitting results of first order kinetic model, Elovich kinetic model, Freundlich kinetic model and parabolic diffusion kinetic model. The results of heat treatment experiments showed that mercury release rate of the CFB fly ash was closely related to the heating temperature and time. The release rate of mercury in the CFB fly ash was lower than 0.2 at temperature below 200 ℃, while the release rate of mercury in the CFB fly ash was no less than 0.935 at the temperature over 300 ℃. The results of temperature-programmed pyrolysis experiments suggested that Mercury species present in the fly ash include HgCl2, Hg2Cl2, HgO, HgSO4, HgS (black) and HgS (red). HgS (black) and HgS (red) were the main mercury species present in the fly ash. The fitting results of kinetic equation showed that Elovich kinetic model was more applicable to reflect the Hg release from the fly ash, while the correlation coefficient R2 between the experimental and calculated data was greater than 0.95. It is indicated that this process controlled by multiple reaction mechanisms, and the activation energy changes greatly.
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  • 收稿日期:  2020-01-07
李晓航, 滕阳, 王鹏程, 李丽锋, 张锴. 燃煤电站CFB锅炉飞灰热处理中汞释放特性[J]. 环境化学, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
引用本文: 李晓航, 滕阳, 王鹏程, 李丽锋, 张锴. 燃煤电站CFB锅炉飞灰热处理中汞释放特性[J]. 环境化学, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
shu
LI Xiaohang, TENG Yang, WANG Pengcheng, LI Lifeng, ZHANG Kai. Release characteristics of mercury in fly ashes collected from coal-fired CFB power units during thermal treatment[J]. Environmental Chemistry, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
Citation: LI Xiaohang, TENG Yang, WANG Pengcheng, LI Lifeng, ZHANG Kai. Release characteristics of mercury in fly ashes collected from coal-fired CFB power units during thermal treatment[J]. Environmental Chemistry, 2020, (5): 1375-1383. doi: 10.7524/j.issn.0254-6108.2020010702
shu

燃煤电站CFB锅炉飞灰热处理中汞释放特性

    通讯作者: 张锴, E-mail: kzhang@ncepu.edu.cn
  • 1. 华北电力大学热电生产过程污染物监测与控制北京市重点实验室, 北京, 102206;
  • 2. 山西河坡发电有限责任公司, 阳泉, 045011
  • 收稿日期:  2020-01-07
基金项目:

国家自然科学基金（U1610254），山西省重大专项（MD2015-01）和中央高效基本业务费（2017MS020）资助.

摘要: 为考察循环流化床锅炉飞灰的汞释放特性，本文以某循环流化床CFB锅炉燃煤发电机组飞灰为样品，通过热处理实验和程序升温热解实验考察温度和时间对飞灰样品汞释放特性的影响以及热处理前后飞灰中汞的种类及其释放规律，并结合一级动力学方程、Elovich动力学方程、Freundlich动力学方程和抛物线扩散动力学方程对该过程进行具体分析.热处理实验结果表明，飞灰汞释放速率与热处理的温度和时间密切相关.温度为200℃以下时飞灰中汞的释放率最大不超过0.2，当温度达到300℃以上时，飞灰中汞的释放率不低于0.935.程序升温热解实验表明，飞灰中汞化合物种类包括HgCl2、Hg2Cl2、HgO、HgSO4、HgS（黑）和HgS（红），其中HgS（黑）和HgS（红）是飞灰中汞的主要赋存形态.动力学方程拟合结果表明，Elovic动力学方程适用于描述飞灰汞释放过程，各实验条件下拟合值与实验值的相关系数R2均大于0.95，这说明该过程受多个反应机制控制且反应中活化能变化较大.

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