Influence of hydrothermal upgrading on physical and chemical structures and moisture readsorption characteristics of a lignite

FENG Xiao-fei; ZHANG Cheng; ZHANG Xiao-pei; LI Sheng-ming; GE Jiang; CHEN Gang

Volume 44 Issue 1

Jan. 2016

Turn off MathJax

Article Contents

Article Navigation > Journal of Fuel Chemistry and Technology > 2016 > 44(1): 23-29

FENG Xiao-fei, ZHANG Cheng, ZHANG Xiao-pei, LI Sheng-ming, GE Jiang, CHEN Gang. Influence of hydrothermal upgrading on physical and chemical structures and moisture readsorption characteristics of a lignite[J]. Journal of Fuel Chemistry and Technology, 2016, 44(1): 23-29.

Citation:

FENG Xiao-fei, ZHANG Cheng, ZHANG Xiao-pei, LI Sheng-ming, GE Jiang, CHEN Gang. Influence of hydrothermal upgrading on physical and chemical structures and moisture readsorption characteristics of a lignite[J]. Journal of Fuel Chemistry and Technology, 2016, 44(1): 23-29.

Citation:

FENG Xiao-fei, ZHANG Cheng, ZHANG Xiao-pei, LI Sheng-ming, GE Jiang, CHEN Gang. Influence of hydrothermal upgrading on physical and chemical structures and moisture readsorption characteristics of a lignite[J]. Journal of Fuel Chemistry and Technology, 2016, 44(1): 23-29.

PDF( 5462 KB)

Influence of hydrothermal upgrading on physical and chemical structures and moisture readsorption characteristics of a lignite

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Funds:

The project was supported by National Natural Science Foundation of China 51006042

Natural Science Foundation of Hubei Province 2012FFB02602

Independent Innovation Fund of HUST 2013QN082

More Information

Corresponding author: ZHANG Cheng, Tel:027-87542417-8301, Fax:027-87545526, E-mail:chengzhang@mail.hust.edu.cn
Received Date: 2015-08-20
Rev Recd Date: 2015-10-27

Available Online: 2022-03-23

Publish Date: 2016-01-01

Abstract

Abstract

Zhaotong lignite from Yunnan province was hydrothermally upgraded at 150-300 ℃, then the changes of surface oxygen-containing groups were analyzed by Fourier transform infrared spectroscopy, and the evolution of pore structure was identified by nitrogen adsorption isotherm. Constant temperature and humidity incubator were used to investigate moisture readsorption characteristics. The results indicate that the main hydrophilic oxygen-containing functional groups (-OH, -COOH, >C=O) decrease and are removed effectively with increase of upgrading temperature. Large changes occur in pore structures of the treated coal, in which the specific surface area and total pore volume increase firstly then decrease with increasing temperature, moreover tar initially generate at 250-300 ℃. Moisture readsorption performance is restrained effectively under the synergy effect of physical and chemical structures, and the moisture readsorption ratio decreases continuously with increase of upgrading temperature. Environment humidity is a key factor affecting moisture readsorption considering storage of the upgraded lignite. Therefore the situation of hydrothermal upgrading at high temperature and storage at low temperature and low humidity could be more advantageous in terms of enhancing efficiency of lignite upgrading.
- lignite,
- hydrothermal upgrading,
- oxygen-containing functional groups,
- pore structure,
- moisture readsorption

FullText(HTML)

References(26)

References

[1]	朱书全.褐煤提质技术开发现状及分析[J].洁净煤技术, 2011, 17(1): 1-4. http://www.cnki.com.cn/Article/CJFDTOTAL-JJMS201101002.htm ZHU Shu-quan. Development status and analysis of lignite quality improvement technology[J]. Clean Coal Technol, 2011, 17(1): 1-4. http://www.cnki.com.cn/Article/CJFDTOTAL-JJMS201101002.htm
[2]	徐鑫, 熊志军.国内外煤炭提质技术应用现状[J].中国煤炭, 2013, 39(12): 133-137. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGME201312039.htm XU Xin, XIONG Zhi-jun. The current application situation of upgrading technology of domestic and international coal[J]. China Coal, 2013, 39(12): 133-137. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGME201312039.htm
[3]	杜敬文, 殷甲楠, 樊丽华, 梁英华.褐煤利用技术现状[J].洁净煤技术, 2015, 21(1): 73-76. http://www.cnki.com.cn/Article/CJFDTOTAL-JJMS201501020.htm DU Jing-wen, YIN Jia-nan, FAN Li-hua, LIANG Ying-hua. Status of lignite utilization technologies[J]. Clean Coal Technol, 2015, 21(1): 73-76. http://www.cnki.com.cn/Article/CJFDTOTAL-JJMS201501020.htm
[4]	虞育杰, 刘建忠, 王传成, 胡亚轩, 周俊虎, 岑可法.低阶煤脱水提质技术发展现状[J].热力发电, 2011, 40(9): 1-4. http://www.cnki.com.cn/Article/CJFDTOTAL-RLFD201109002.htm YU Yu-jie, LIU Jian-zhong, WANG Chuan-cheng, HU Ya-xuan, ZHOU Jun-hu, CEN Ke-fa. Status quo of development in dewatering for upgrading low rank coal[J]. Therm Power Gener, 2011, 40(9): 1-4. http://www.cnki.com.cn/Article/CJFDTOTAL-RLFD201109002.htm
[5]	NAKAGAWA H, NAMBA A, BÖHLMANN M, MIURA K. Hydrothermal dewatering of brown coal and catalytic hydrothermal gasification of the organic compounds dissolving in the water using a novel Ni/carbon catalyst[J]. Fuel, 2004, 83(6): 719-725. doi: 10.1016/j.fuel.2003.09.020
[6]	MURSITO A T, HIRAJIMA T, SASAKI K. Alkaline hydrothermal de-ashing and desulfurization of low quality coal and its application to hydrogen-rich gas generation[J]. Energy Convers Manage, 2011, 52(1): 762-769. doi: 10.1016/j.enconman.2010.08.001
[7]	LIU X, LI B, MIURA K. Analysis of pyrolysis and gasification reactions of hydrothermally and supercritically upgraded low-rank coal by using a new distributed activation energy model[J]. Fuel Process Technol, 2001, 69(1): 1-12. doi: 10.1016/S0378-3820(00)00113-2
[8]	王毅, 王志青.褐煤水热改质及改质废水催化气化的研究[J].煤炭转化, 2012, 35(3): 28-32. http://www.cnki.com.cn/Article/CJFDTOTAL-RLFD201109002.htm WANG Yi, WANG Zhi-qing. Hydrothermal upgrading of lignite and reclamation of its wastewater by catalytic gasification[J]. Coal Convers, 2012, 35(3): 28-32. http://www.cnki.com.cn/Article/CJFDTOTAL-RLFD201109002.htm
[9]	邹祥波, 王智化, 胡昕, 周志军, 黄镇宇, 周俊虎, 岑可法.提质褐煤的快速热裂解气体产物的析出特性[J].燃烧科学与技术, 2013, 19(3): 268-274. http://www.cnki.com.cn/Article/CJFDTOTAL-RSKX201303013.htm ZOU Xiang-bo, WANG Zhi-hua, HU Xin, ZHOU Zhi-jun, HUANG Zhen-yu, ZHOU Jun-hu, CEN Ke-fa. Release characteristics of gaseous products during rapid pyrolysis of upgraded lignite[J]. J Combust Sci Technol, 2013, 19(3): 268-274. http://www.cnki.com.cn/Article/CJFDTOTAL-RSKX201303013.htm
[10]	葛立超, 张彦威, 应芝, 王智化, 周俊虎, 岑可法.水热处理对我国典型褐煤气化特性的影响[J].中国电机工程学报, 2013, 33(32): 14-20. http://www.cnki.com.cn/Article/CJFDTOTAL-RSKX201303013.htm GE Li-chao, ZHANG Yan-wei, YING Zhi, WANG Zhi-hua, ZHOU Jun-hu, CEN Ke-fa. Influence of the hydrothermal dewatering on the gasification characteristics of typical chinese lignite[J]. Proc CSEE, 2013, 33(32): 14-20. http://www.cnki.com.cn/Article/CJFDTOTAL-RSKX201303013.htm
[11]	SAKAGUCHI M, LAURSEN K, NAKAGAWA H, MIURA K. Hydrothermal upgrading of Loy Yang Brown coal-Effect of upgrading conditions on the characteristics of the products[J]. Fuel Process Technol, 2008, 89(4): 391-396. doi: 10.1016/j.fuproc.2007.11.008
[12]	OGUNSOLA O I. Thermal upgrading effect on oxygen distribution in lignite[J]. Fuel Process Technol, 1993, 34(1): 73-81. doi: 10.1016/0378-3820(93)90062-9
[13]	YU Y, LIU J, WANG R, ZHOU J, CEN K.Effect of hydrothermal dewatering on the slurryability of brown coals[J]. Energy Convers Manage, 2012, 57: 8-12. doi: 10.1016/j.enconman.2011.11.016
[14]	CHOI H, THIRUPPATHIRAJA C, KIM S, RHIM Y, LIM J, LEE S. Moisture readsorption and low temperature oxidation characteristics of upgraded low rank coal[J]. Fuel Process Technol, 2011, 92(10): 2005-2010. doi: 10.1016/j.fuproc.2011.05.025
[15]	张书, 陈艳巨, 刘丹, 王雷, 米建新, 王永刚.水热处理对胜利褐煤孔隙结构和表面性质的影响[J].煤炭科学技术, 2013, 41(6): 117-121. http://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201306030.htm ZHANG Shu, CHEN Yan-ju, LIU Dan, WANG Lei, MI Jian-xin, WANG Yong-gang. Hydrothermal treatment affected to pore structure and surface property of shengli lignite[J]. Coal Sci Technol, 2013, 41(6): 117-121. http://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201306030.htm
[16]	OHKI A, XIE X, INAKAJIMA T, ITAHARA T, MAEDA S. Change in properties and combustion characteristics of an indonesian Low-Rank coal due to hydrothermal treatment[J]. Coal Prep, 1999, 21(1): 23-34. doi: 10.1080/07349349908945606
[17]	MAN C, LIU Y, ZHU X, CHE D. Moisture readsorption performance of air-dried and hydrothermally dewatered lignite[J]. Energy Fuels, 2014, 28(8): 5023-5030. doi: 10.1021/ef501255n
[18]	ZHANG J, ZHANG C, QIU Y, CHEN L, TAN P, CHEN G. Evaluation of moisture readsorption and combustion characteristics of a lignite thermally upgraded with the addition of asphalt[J]. Energy Fuels, 2014, 28(12): 7680-7688. doi: 10.1021/ef5019115
[19]	TAHMASEBI A, YU J, HAN Y, LI X. A study of chemical structure changes of Chinese lignite during fluidized-bed drying in nitrogen and air[J]. Fuel Process Technol, 2012, 101: 85-93. doi: 10.1016/j.fuproc.2012.04.005
[20]	张锦萍, 张成, 谭鹏, 杨显军, 苏杭, 陈刚.含氧官能团对提质褐煤复吸水特性的影响[J].中国电机工程学报, 2014, 34(35): 6279-6285. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201435004.htm ZHANG Jin-ping, ZHANG Cheng, TAN Peng, YANG Xian-jun, SU Hang, CHEN Gang. Influence of oxygen-containing groups on moisture re-adsorption characteristics of upgraded lignite[J]. Proc CSEE, 2014, 34(35): 6279-6285. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201435004.htm
[21]	王娜, 朱书全, 杨玉立, 吴鹏, 张恒.含氧官能团对褐煤热态提质型煤防水性的影响[J].煤炭科学技术, 2010, 38(3): 125-128. http://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201003036.htm WANG Na, ZHU Shu-quan, YANG Yu-li, WU Peng, ZHANG Heng. Oxygen-containing function groups affected to waterproof of thermal upgraded lignite briquettes[J]. Coal Sci Technol, 2010, 38(3): 125-128. http://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201003036.htm
[22]	IBARRA J, MU OZ E, MOLINER R. FT-IR study of the evolution of coal structure during the coalification process[J]. Org Geochem, 1996, 24(6/7): 725-735. http://www.sciencedirect.com/science/article/pii/0146638096000630
[23]	CHEN Y, MASTALERZ M, SCHIMMELMANN A. Characterization of chemical functional groups in macerals across different coal ranks via micro-FTIR spectroscopy[J]. Int J Coal Geol, 2012, 104: 22-33. doi: 10.1016/j.coal.2012.09.001
[24]	WANG S, TANG Y, SCHOBERT H H, GUO Y N, GAO W, LU X. FT-IR and simultaneous TG/MS/FT-IR study of Late Permian coals from Southern China[J]. J Anal Appl Pyrolysis, 2013, 100(6): 75-80. http://www.sciencedirect.com/science/article/pii/S0165237012002422
[25]	冯青, 李世武, 张丽.工程热力学[M].西安:西北工业大学出版社, 2006: 577-579. FENG Qing, LI Shi-wu, ZHANG Li. Engineering thermodynamics[M]. Xian: Northwestern Polytechnical University Press, 2006: 577-579.
[26]	FU P, HU S, XIANG J, SUN L, SU S, WANG J. Evaluation of the porous structure development of chars from pyrolysis of rice straw: Effects of pyrolysis temperature and heating rate[J]. J Anal Appl Pyrolysis, 2012, 98: 177-183. doi: 10.1016/j.jaap.2012.08.005