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Release characteristic of different classes of sodium during combustion of Zhun-Dong coal investigated by laser-induced breakdown spectroscopy

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  • Engineering Sciences
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Science Bulletin

Abstract

Serious fouling and slagging problems are associated with the combustion of Chinese Zhun-Dong coal due to its high content of sodium (Na). Understanding the release characteristic of Na during the combustion is essential to viable utilization of this coal. In this work, coal samples were treated with a sequence of solvents: water (H2O), ammonium acetate (NH4Ac), hydrochloric acid (HCl), and the release characteristics of various classes of Na during coal combustion were investigated using the technique of laser-induced breakdown spectroscopy. The relative contribution of various Na classes to the Na release during each combustion stage was found to be similar, in the order of H2O-soluble Na > NH4Ac-soluble Na > HCl-soluble Na > insoluble Na. Sodium released during the devolatilization stage can be attributed to each of the sodium classes. After the devolatilization stage, H2O-soluble Na and NH4Ac-soluble Na dominated the Na release during both char and ash stages. Over 64 % of the total Na released during combustion comes from the H2O-soluble Na, which suggests that the Na release during the combustion of Zhun-Dong coal can be reduced effectively after treatment by H2O washing.

摘要

新疆准东煤由于钠含量高, 其燃烧过程伴随严重的沾污腐蚀问题. 充分认识准东 煤燃烧过程中钠释放特性对其安全利用至关重要. 本文利用去离子水、醋酸铵溶液和盐酸溶 液依次对准东煤进行洗涤, 并结合激光诱导击穿光谱 (Laser-induced breakdown spectroscopy, LIBS) 技术对准东煤燃烧过程中不同形态钠的释放特性进行了实验研究. 研究表明, 不同形 态钠对燃烧中钠释放贡献程度的顺序为: 水溶钠>醋酸铵溶钠>盐酸溶钠>不溶钠. 每种形态 的钠均会在挥发分阶段释放, 而焦炭和灰分阶段的钠释放主要来自于水溶钠和醋酸铵溶钠. 整个燃烧过程64%以上的钠释放来自于水溶钠, 表明水洗处理可有效降低准东煤燃烧过程中 的钠释放.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51406178), China Postdoctoral Science Foundation (2014M551732), National Basic Research Program of China (2012CB214906), and Specialized Research Fund for the Doctoral Program of Higher Education of China (20130101110095).

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Authors and Affiliations

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China

    Yong He, Kunzan Qiu, Ronald Whiddon, Zhihua Wang, Yanqun Zhu, Yingzu Liu & Kefa Cen

  2. Division of Combustion Physics, Lund University, 22100, Lund, Sweden

    Zhongshan Li

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  1. Yong He
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  2. Kunzan Qiu
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  3. Ronald Whiddon
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  4. Zhihua Wang
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  5. Yanqun Zhu
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  7. Zhongshan Li
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  8. Kefa Cen
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Correspondence to Kunzan Qiu.

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He, Y., Qiu, K., Whiddon, R. et al. Release characteristic of different classes of sodium during combustion of Zhun-Dong coal investigated by laser-induced breakdown spectroscopy. Sci. Bull. 60, 1927–1934 (2015). https://doi.org/10.1007/s11434-015-0922-9

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  • DOI: https://doi.org/10.1007/s11434-015-0922-9

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