Effect of atmosphere on sodium migration during conversion of high sodium coals

LUO An-qi; ZHU Ping; ZHANG Jian-shu; QU Xuan; ZHANG Rong; BI Ji-cheng; ZHANG Jin-li

Volume 46 Issue 5

May 2018

Turn off MathJax

Article Contents

Article Navigation > Journal of Fuel Chemistry and Technology > 2018 > 46(5): 513-520

LUO An-qi, ZHU Ping, ZHANG Jian-shu, QU Xuan, ZHANG Rong, BI Ji-cheng, ZHANG Jin-li. Effect of atmosphere on sodium migration during conversion of high sodium coals[J]. Journal of Fuel Chemistry and Technology, 2018, 46(5): 513-520.

Citation:

LUO An-qi, ZHU Ping, ZHANG Jian-shu, QU Xuan, ZHANG Rong, BI Ji-cheng, ZHANG Jin-li. Effect of atmosphere on sodium migration during conversion of high sodium coals[J]. Journal of Fuel Chemistry and Technology, 2018, 46(5): 513-520.

Citation:

PDF( 1126 KB)

Effect of atmosphere on sodium migration during conversion of high sodium coals

1.
School of Chemistry and Chemical Engineering, Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, China
2.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
3.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Funds:

the National Natural Science Foundation of China 21566033

the National Natural Science Foundation of China U1703253

More Information

Corresponding author: ZHANG Jian-shu, E-mail: zjschem@163.com
Received Date: 2018-01-18
Rev Recd Date: 2018-03-28

Available Online: 2021-01-23

Publish Date: 2018-05-10

Abstract

Abstract

The sodium release and transformation of Yili (YL) and Hutubi (HTB) coal were examined at different temperatures under N₂, CO₂ and H₂O atmospheres. By using sequential extraction and wet digestion separately, the occurrence mode and content of sodium in raw coal and chars were measured. The migration of sodium in two coals was studied qualitatively and quantitatively. The results show that water soluble sodium in YL coal accounts for 80.08%, while in HTB, insoluble sodium is 61.54%. The volatilization of sodium in two coals increases with increasing temperature. Water soluble sodium in semi coke shows a decrease trend; ammonium acetate soluble sodium increases and then decreases; hydrochloric acid soluble sodium exhibits an increasing tendency. For YL volatilization of sodium is inhibited by CO₂ while it is promoted by H₂O compared with N₂. At 900℃ volatilization of sodium under CO₂ and H₂O is 50.25% and 111.45%, respectively, of that under N₂. CO₂ atmosphere can inhibit volatilization of sodium in HTB. At 900℃ volatilized sodium under CO₂ is 80.91% of that under N₂. In H₂O atmosphere, volatilization of sodium is higher than that in N₂ before 800℃ and slightly lower than that in N₂ at 900℃. The predominant sodium in YL coal is water soluble which volatilized during increasing temperature and transformed to hydrochloric acid soluble and insoluble sodium simultaneously. While for HTB, insoluble sodium is the dominant occurrence mode, followed by water soluble one. CO₂ and H₂O can promote transformation of insoluble sodium to soluble one in HTB coal.
- sodium,
- migration,
- extraction,
- pyrolysis,
- gasification

FullText(HTML)

References(30)

References

[1]	王明华, 宁成浩, 李瑞峰.新疆现代煤化工产业的关键问题与十三五发展建议[J].中国煤炭, 2017, 43(2):5-10. http://d.wanfangdata.com.cn/Periodical_zgmt201506015.aspx WANG Ming-hua, NING Cheng-hao, LI Rui-feng. Research on the development status and key issues of Xinjiang modern coal-chemistry industry and it's suggestions in the thirteenth Five-Year[J]. China Coal, 2017, 43(2):5-10. http://d.wanfangdata.com.cn/Periodical_zgmt201506015.aspx
[2]	WANG X B, XU Z X, WEI B, ZHANG L, TAN H Z, YANG T, MIKULĆIĆ H, DUIĆ N. The ash deposition mechanism in boilers burning Zhundong coal with high contents of sodium and calcium:A study from ash evaporating to condensing[J]. Appl Thermal Eng, 2015, 80:150-159. doi: 10.1016/j.applthermaleng.2015.01.051
[3]	CHEN L, LI J H, GE M F. The poisoning effect of alkali metals doping over nano V₂O₅-WO₃/TiO₂ catalysts on selective catalytic reduction of NO_x by NH₃[J]. Chem Eng J, 2011, 170(2):531-537. http://agris.fao.org/openagris/search.do?recordID=US201500022113
[4]	WANG C A, JIN X, WANG Y K, YAN Y, CUI J, LIU Y H, CHE D F. Release and transformation of sodium during pyrolysis of Zhundong coals[J]. Energy Fuels, 2015, 29(1):78-85. doi: 10.1021/ef502128s
[5]	SHIMOGORI M, MINE T, OHYATSU N, TAKARAYAMA N, MATSUMURA Y. Effects of fine ash particles and alkali metals on ash deposition characteristics at the initial stage of ash deposition determined in 1.5MW_th pilot plant tests[J]. Fuel, 2012, 97:233-240. doi: 10.1016/j.fuel.2012.01.036
[6]	宋维健, 宋国良, 齐晓宾, 吕清刚.不同预处理方法对准东高碱煤中碱金属含量测定的影响[J].燃料化学学报, 2016, 44(2):162-167. http://manu60.magtech.com.cn/rlhxxb/CN/abstract/abstract18775.shtml SONG Wei-jian, SONG Guo-liang, QI Xiao-bin, LÜ Qing-gang. Effect of pretreatment methods on the determination of alkali metal content in high alkali metal Zhundong coal[J]. J Fuel Chem Technol, 2016, 44(2):162-167. http://manu60.magtech.com.cn/rlhxxb/CN/abstract/abstract18775.shtml
[7]	PETTERSSON A, ZEVENHOVEN M, STEENARI B M, ÅMAND L E. Application of chemical fractionation methods for characterisation of biofuels, waste derived fuels and CFB co-combustion fly ashes[J]. Fuel, 2008, 87(15):3183-3193. https://www.sciencedirect.com/science/article/pii/S001623610800224X
[8]	JORDAN C A, AKAY G. Speciation and distribution of alkali, alkali earth metals and major ash forming elements during gasification of fuel cane bagasse[J]. Fuel, 2012, 91(1):253-263. doi: 10.1016/j.fuel.2011.05.031
[9]	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. doi: 10.1016/0016-2361(86)90291-7
[10]	BENSON S A, HOLM P L. Comparison of inorganics in three low-rank coals[J]. Ind Eng Chem Prod Res Dev, 1985, 24(1):145-149. doi: 10.1021/i300017a027
[11]	刘大海, 张守玉, 涂圣康, 金涛, 施登宇, 裴育峰.五彩湾煤中钠在热解过程中的形态变迁[J].燃料化学学报, 2014, 42(10):1190-1196. doi: 10.3969/j.issn.0253-2409.2014.10.006 LIU Da-hai, ZHANG Shou-yu, TU Sheng-kang, JIN Tao, SHI Deng-yu, PEI Yu-feng. Transformation of sodium during Wucaiwan coal pyrolysis[J]. J Fuel Chem Technol, 2014, 42(10):1190-1196. doi: 10.3969/j.issn.0253-2409.2014.10.006
[12]	陈川, 张守玉, 刘大海, 郭熙, 董爱霞, 熊绍武, 施大钟, 吕俊复.新疆高钠煤中钠的赋存形态及其对燃烧过程的影响[J].燃料化学学报, 2013, 41(7):832-838. http://manu60.magtech.com.cn/rlhxxb/CN/abstract/abstract18218.shtml CHEN Chuan, ZHANG Shou-yu, LIU Da-hai, GUO Xi, DONG Ai-xia, XIONG Shao-wu, SHI Da-zhong, LÜ Jun-fu. Existence form of sodium in high sodium coals from Xinjiang and its effect on combustion process[J]. J Fuel Chem Technol, 2013, 41(7):832-838. http://manu60.magtech.com.cn/rlhxxb/CN/abstract/abstract18218.shtml
[13]	徐彦辉. 准东煤热解过程中无机钠的转化及对热解产物的影响[D]. 哈尔滨: 哈尔滨工业大学, 2015. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=D753303 XU Yan-hui. The transformation of inorganic sodium and it's effect on the products during the pyrolysis of zhundong coal[D]. Harbin: Harbin Institute of Technology, 2015. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=D753303
[14]	郭帅, 蒋云峰, 熊青安, 宋双双, 赵建涛, 房倚天.准东煤热解过程中不同赋存形态钠变迁规律的研究[J].燃料化学学报, 2017, 45(3):257-264. http://manu60.magtech.com.cn/rlhxxb/CN/abstract/abstract18987.shtml GUO Shuai, JIANG Yun-feng, XIONG Qing-an, SONG Shuang-shuang, ZHAO Jian-tao, FANG Yi-tian. Release and transformation behaviors of sodium species with different occurrence modes during pyrolysis of Zhundong coal[J]. J Fuel Chem Technol, 2017, 45(3):257-264. http://manu60.magtech.com.cn/rlhxxb/CN/abstract/abstract18987.shtml
[15]	姚宇翔, 金晶, 钟程鹏, 王永贞, 高姗姗, 赵庆庆.准东煤中钠的赋存形态及挥发特性[J].煤炭转化, 2016, 39(1):1-5. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mtzh201601001 YAO Yu-xiang, JIN Jing, ZHONG Cheng-peng, WANG Yong-chen, GAO Shan-shan, ZHAO Qing-qing. Occurrence mode and volatilization characteristic of sodium in Zhundong coal[J]. Coal Convers, 2016, 39(1):1-5. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mtzh201601001
[16]	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. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=rlhxxb200101010 ZHANG Jun, HAN Chun-li, YAN Zheng, YU Gang, LIU Kun-lei, XU Yi-qian. Experimental studies on the behavior of sodium of coal in the initial stage of combustion[J]. J Fuel Chem Technol, 2001, 29(1):49-53. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=rlhxxb200101010
[17]	王文慧, 贾宝玉, 姚洪, 李显.准东煤热解过程中钠的迁移规律研究[J].工程热物理学报, 2015, 36(12):2733-2737. http://www.cqvip.com/QK/90922X/201512/666963750.html WANG Wen-hui, JIA Bao-yu, YAO Hong, LI Xia. An investigation of sodium transformation in Zhundong coal during pyrolysis[J]. J Eng Thermophys-Rus, 2015, 36(12):2733-2737. http://www.cqvip.com/QK/90922X/201512/666963750.html
[18]	HE Y, QIU K Z, WHIDDON R, WANG Z H, ZHU Y Q, LIU Y Z, LI Z S, CEN K F. Release characteristic of different classes of sodium during combustion of Zhun-Dong coal investigated by laser-induced breakdown spectroscopy[J]. Sci Bull, 2015, 60(22):1927-1934. doi: 10.1007/s11434-015-0922-9
[19]	ZHANG L, JIAO F, BINNER E, BHATTACHARYA S, NINOMIYA Y, LI C Z. Experimental investigation of the combustion of bituminous coal in air and O₂/CO₂ mixtures:2. Variation of the transformation behaviour of mineral matter with bulk gas composition[J]. Fuel, 2011, 90(4):1361-1369. doi: 10.1016/j.fuel.2011.01.012
[20]	ENDERS M, WILLENBORG W, ALBRECHT J, PUTNIS A. Alkali retention in hot coal slag under controlled oxidizing gas atmospheres (air-CO₂)[J]. Fuel Process Technol, 2000, 68(1):57-73. doi: 10.1016/S0378-3820(00)00110-7
[21]	KOSMINSKI A, ROSS D P, AGNEW J B. Transformations of sodium during gasification of low-rank coal[J]. Fuel Process Technol, 2006, 87(11):943-952. doi: 10.1016/j.fuproc.2005.06.006
[22]	SCHAFER H N S. Chapter 7-Functional groups and ion exchange properties[J]. Sci Vict Brown Coal, 1991:323-357. http://www.sciencedirect.com/science/article/pii/B9780750604208500129
[23]	MCKEE D W, SPIRO C L, KOSKY P G, LAMBY E J. Catalysis of coal char gasification by alkali metal salts[J]. Fuel, 1983, 62(2):217-220. doi: 10.1016/0016-2361(83)90202-8
[24]	LI X, HAYASHI J I, LI C Z. Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal. Part Ⅶ. Raman spectroscopic study on the changes in char structure during the catalytic gasification in air[J]. Fuel, 2006, 85(10):1509-1517. https://www.sciencedirect.com/science/article/pii/S0016236117312887
[25]	SATHE C, HAYASHI J I, LI C Z, CHIBA T. Release of alkali and alkaline earth metallic species during rapid pyrolysis of a Victorian brown coal at elevated pressures[J]. Fuel, 2003, 82(12):1491-1497. doi: 10.1016/S0016-2361(03)00070-X
[26]	MCKEE D W, SPIRO C L, KOSKY P G, LAMBY E J. Catalysis of coal char gasification by alkali metal salts[J]. Fuel, 1983, 62(2):217-220. doi: 10.1016/0016-2361(83)90202-8
[27]	申文琴, 熊利红, 沙兴中.热煤气中碱金属蒸汽的形成及清除方法[J].煤气与热力, 1998, 18(6):3-5. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mqyrl199806001 SHEN Wen-qin, XIONG Li-hong, SHA Xing-zhong. Formation and removal of gaseous alkali metal of hot gas[J]. Gas Heat, 1998, 18(6):3-5. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=mqyrl199806001
[28]	胡天喜, 于建国. CaCl₂-NaCl混合助剂分解钾长石提取钾的实验研究[J].过程工程学报, 2010, 10(4):701-705. https://t.docin.com/p-1942436474.html HU Tian-xi, YU Jian-guo. Experimental study on decomposition of K-feldspar with CaCl₂ and NaCl for extraction of potassium[J]. Chin J Process Eng, 2010, 10(4):701-705. https://t.docin.com/p-1942436474.html
[29]	王玉江, 余桂郁, 邓敏, 唐明述.含碱矿物碱性环境下分解的热力学分析[J].硅酸盐学报, 2006, 34(3):345-352. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gsyxb200603017 WANG Yu-jiang, YU Gui-yu, DENG Min, TANG Ming-shu. Thermodynamic analysis of alkaline mineral dissolution in alkali solution[J]. J Chin Ceramic Soc, 2006, 34(3):345-352. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gsyxb200603017
[30]	WEI X F, HUANG J J, LIU T F, FANG Y T, WANG Y. Transformation of alkali metals during pyrolysis and gasification of a lignite[J]. Energy Fuels, 2008, 22(3):1840-1844. doi: 10.1021/ef7007858