Existence form of sodium in high sodium coals from Xinjiang and its effect on combustion process
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摘要: 采用不同萃取液对中国新疆高钠煤进行逐级萃取实验,利用离子色谱仪和电感耦合等离子体原子发射光谱仪对萃取制得的滤液和固体煤样进行相应的元素分析,并通过逐级萃取后煤样的着火温度、燃尽温度和综合燃烧特性指数来分析高钠煤中不同存在形式钠对其燃烧特性的影响.结果表明,中国新疆高钠煤中的钠主要以水溶钠为主,有机钠和不可溶钠含量较少.影响高钠煤中水溶钠含量的主要因素有煤颗粒内部孔隙结构和颗粒粒径,且高钠煤中有机钠在各个粒径范围都保持了相对稳定的含量.煤种不同会导致煤中水溶钠与水溶氯的存在形式不同.煤中水溶钠的存在不利于高钠煤的着火温度和燃尽温度的降低与燃烧特性的提高,相反煤中的有机钠却对其具有促进作用.Abstract: The existence form of sodium in Xinjiang coals was studied by extraction with distilled water, ammonium acetate and hydrochloric acid step by step. The extraction liquid and the residual coal samples were analyzed using an ion chromatography and an inductively coupled plasma atomic emission spectroscopy. The influences of different forms of sodium on the combustion characteristics of the high sodium coal were evaluated by the ignition temperature, the burnout temperature and the combustion characteristic index. The results indicate that the sodium existing in the coals is mainly in the form of water-soluble sodium, while the proportions of acid-soluble sodium and insoluble sodium are smaller. The particle size and inner pore structure of coal may have great influences on the water-soluble sodium content in coal samples, while the organic sodium contained in different particle size ranges of coal remains relatively constant. The water-soluble sodium and chlorine in different coals differ from each other. The water-soluble sodium would increase the ignition temperature and burnout temperature and decrease the combustion characteristic index, while the organic sodium would have catalysis on the combustion of coal.
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Key words:
- high sodium coal /
- sodium /
- existence form /
- chlorine /
- combustion characteristic
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严陆光, 夏训诚, 吕绍勤, 吴甲春, 林闽, 黄常纲. 大力推进新疆大规模综合能源基地的发展[J]. 电工电能新技术, 2011, 30(1): 1-7. (YAN Lu-guang, XIA Xun-cheng, LU Shao-qin, WU Jia-chun, LIN Min, HUANG Chang-gang. Great promotion of development of large scale integrative energy base in Xinjiang[J]. Advanced Technology of Electrical Engineering and Energy, 2011, 30(1): 1-7.) 张守玉, 陈川, 施大钟, 吕俊复, 王健, 郭熙, 董爱霞, 熊绍武. 高钠煤燃烧利用现状[J]. 中国电机工程学报, 2013, 33(5): 1-12. (ZHANG Shou-yu, CHEN Chuan, SHI Da-zhong, LU Jun-fu, WANG Jian, GUO Xi, DONG Ai-xia, XIONG Shao-wu. Situation of combustion utilization of high sodium coal[J]. Proceedings of the CSEE, 2013, 33(5): 1-12.) 董明钢. 高钠煤对锅炉受热面结渣、沾污和腐蚀的影响及预防措施[J]. 热力发电, 2008, 37(9): 35-39. (DONG Ming-Gang. Influence of high-sodium coal upon slagging, contamination, and corrosion on the heating surface of boilers[J]. Thermal Power Generation, 2008, 37(9): 35-39.) 樊冲, 汪军, 倪昊. 生物质与煤共燃结渣特性的研究[J]. 上海理工大学学报, 2010, 32(3): 213-218. (FAN Chong, WANG Jun, NI Hao. Study on slagging characteristics of co-combustion of biomass and coal[J]. Journal of University of Shanghai for Science and Technology, 2010, 32(3): 213-218.) 饶甦, 曹欣玉, 兰泽全, 赵显桥, 周俊虎, 岑可法. 煤灰矿物质在炉内的迁徙分布规律及其对沾污结渣的影响[J]. 燃料化学学报, 2004, 32(4): 395-399. (RAO Su, CAO Xin-yu, LAN Ze-quan, ZHAO Xian-qiao, ZHOU Jun-hu, Cen Ke-fa. Characteristic of mineral species distribution in furnace and its influence on the slagging during coal combustion[J]. Journal of Fuel Chemistry and Technology, 2004, 32(4): 395-399.) 徐晓光, 李水清, 熊刚, 李庚达, 宋蔷, 姚强. 烟气中钾含量对锯屑燃烧过程积灰的影响[J]. 中国电机工程学报, 2009, 29(23): 61-67. (XU Xiao-guang, LI Shui-qing, XIONG Gang, LI Geng-da, SONG Qiang, YAO Qiang. Influence of potassium on ash deposition during sawdust combustion[J]. Proceedings of the CSEE, 2009, 29(23): 61-67.) 汉春利, 张军, 刘坤磊, 徐益谦. 煤中钠存在形式的研究[J]. 燃料化学学报, 1999, 27(6): 575-578. (HAN Chun-li, ZHANG Jun, LIU Kun-lei, XU Yi-qian. Modes of occurrence of sodium in coals[J]. Journal of Fuel Chemistry and Technology, 1999, 27(6): 575-578.) ERICH R. Mineral impurities in coal combustion[M]. Washington: Hemisphere Publishing Corporation, 1985: 97-101. SPIRO C L, WONG J, LYTLE F W, GREEGOR R B, MAYLOTTE D H, LAMSON S H. Forms of potassium in coal and its combustion products[J]. Fuel, 1986, 65(3): 327-336. BENSON S A, HOLM P L. Comparison of inorganic constituents in three low-rank coals[J]. Ind Eng Chem Prod Res Dev, 1985, 24(1): 145-149. 孙学信. 燃煤锅炉燃烧试验技术与方法[M]. 北京: 中国电力出版社, 2001. (SUN Xue-xin. Combustion test method and technology of coal-fired boiler[M]. Beijing: China Electric Power Press, 2001.) 卫小芳, 刘铁峰, 黄戒介, 房倚天, 王洋. 澳大利亚高盐煤中钠在热解过程中的形态变迁[J]. 燃料化学学报, 2010, 38(2): 144-148. (WEI Xiao-fang, LIU Tie-feng, HUANG Jie-jie, FANG Yi-tian, WANG Yang. Transformation of Na in an Australian high-sodium coal during pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2010, 38(2): 144-148.) 张军, 汉春利, 颜峥, 余刚, 刘坤磊, 徐益谦. 煤中钠在燃烧初期行为的研究[J]. 燃料化学学报, 2001, 29(1): 49-53. (ZHANG Jun, HAN Chun-li, YAN Zheng, YU Gang, LIU Kun-lei, XU Yi-qian. Experimental studies on the behaviour of sodium of coal in the initial stage of combustion[J]. Journal of Fuel Chemistry and Technology, 2001, 29(1): 49-53.) 徐旭, 蒋旭光, 何杰, 严建华, 岑可法. 煤中氯赋存形态的试验研究[J]. 煤田地质与勘探, 2002, 30(4): 3-6. (XU Xu, JIANG Xu-guang, HE Jie, YAN Jian-hua, Cen Ke-fa. Experimental research on present form of chlorine in coal[J]. Coal Geology and Exploration, 2002, 30(4): 3-6.) JIMENEZ A, MARTINEZ-TARAZONA M R, SUAREZ-RUIZ I. The mode of occurrence and origin of chlorine in puertollano coal (Spain)[J]. Fuel, 1999, 78(13): 1559-1565. GIBB W H, ANGUS J G. The release of potassium from coal during bomb combustion[J]. J Inst Energy, 1983, 56(428): 149-157. SAUNDERS K G. Microstructural studies of chlorine in some british coals[J]. J Inst Energy, 1980, 53(416): 109-115. 卫小芳, 黄戒介, 房倚天, 王洋. 外加NaCl和NaAc褐煤在气化过程中钠的形态变迁规律研究[J]. 燃料化学学报, 2009, 37(1): 6-10. (WEI Xiao-fang, HUANG Jie-jie, FANG Yi-tian, WANG Yang. Transformation of sodium during gasification of a lignite with addition of NaCl and NaAc[J]. Journal of Fuel Chemistry and Technology, 2009, 37(1): 6-10.) ENDERS M, WILLENBORG W, ALBRECHT J, PUTNIS A. Alkali retention in hot slag under controlled oxidizing gas atmospheres[J]. Fuel Process Technol, 2000, 68(1): 57-73. 汉春利, 张军, 颜峥, 顾璠, 刘坤磊, 徐益谦. 钠在煤燃烧初期释放特性的多元相关分析[J]. 燃烧科学与技术, 2002, 8(5): 395-398. (HAN Chun-li, ZHANG Jun, YAN Zheng, GU Fan, LIU Kun-lei, XU Yi-Qian. Multivariate statistical analysis on the behaviour of sodium of coal in the initial stage of combustion [J]. Journal of Combustion Science and Technology, 2002, 8(5): 395-398.) VAN EYK P J, ASHMAN P J, ALWAHABI Z T, NATHAN G J. The release of water-bound and organic sodium from Loy Yang coal during the combustion of single particles in a flat flame[J]. Combust Flame, 2011, 158(6): 1181-1192. DONGKE ZHANG. 低阶煤程序升温热解过程中钠、硅和硫间的相互作用[J]. 燃料化学学报,2005,33(5):513-519. (Dongke Zhang. Interactions between sodium, silica and sulphur in a low-rank coal during temperature-programmed pyrolysis[J]. Journal of Fuel Chemistry and Technology, 2005, 33(5): 513-519.) 陈海峰, 沙兴中, 徐依青, 杭月珍, 高晋生, 尹桂芳, 倪献智, 王泉清, 白浚仁. 催化剂对煤着火特性的影响Ⅰ.煤性质及煤中矿物质对煤催化着火的影响[J]. 燃料化学学报, 1993, 21(2): 172-179. (CHEN Hai-feng, SHA Xing-zhong, XU Yi-qing, HANG Yue-zhen, GAO Jin-sheng, YIN Gui-fang, NI Xian-zhi, WANG Quan-qing. BAI Jun-ren. Catalytic ignition property of coal I. The influence of coal rank and mineral matter in coals or chars[J]. Journal of Fuel Chemistry and Technology, 1993, 21(2): 172-179.)
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