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

作　　者：Yong He Kunzan Qiu Ronald Whiddon Zhihua Wang Yanqun Zhu Yingzu Liu Zhongshan Li Kefa Cen 

机构地区：[1]State Key Laboratory of Clean Energy Utilization, Zhejiang University [2]Division of Combustion Physics, Lund University

出　　处：《Science Bulletin》2015年第22期1927-1934,共8页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51406178);China Postdoctoral Science Foundation(2014M551732);National Basic Research Program of China(2012CB214906);Specialized Research Fund for the Doctoral Program of Higher Education of China(20130101110095)

摘　　要：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 （HC1）, 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 〉 NHaAcsoluble 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 NHaAc-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.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 [ NH4 Acsoluble 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 H2 O washing.

关 键 词：Zhun-Dong coal Laser-inducedbreakdown spectroscopy （LIBS） - Sodium releaseCombustion Online measurement 

分 类 号：TQ534[化学工程—煤化学工程] TN24[电子电信—物理电子学]