Influence of coal blending on ash fusion characteristics for coal with high ash fusion temperature

XIE Liang-cai; LI Feng-hai; XUE Zhao-min; XU Long; MA Xiao-xun

Volume 44 Issue 12

Dec. 2016

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Article Navigation > Journal of Fuel Chemistry and Technology > 2016 > 44(12): 1430-1439

XIE Liang-cai, LI Feng-hai, XUE Zhao-min, XU Long, MA Xiao-xun. Influence of coal blending on ash fusion characteristics for coal with high ash fusion temperature[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1430-1439.

Citation:

XIE Liang-cai, LI Feng-hai, XUE Zhao-min, XU Long, MA Xiao-xun. Influence of coal blending on ash fusion characteristics for coal with high ash fusion temperature[J]. Journal of Fuel Chemistry and Technology, 2016, 44(12): 1430-1439.

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Influence of coal blending on ash fusion characteristics for coal with high ash fusion temperature

1.
School of Chemical Engineering, Northwest University, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi'an Engineering Laboratory for Energy Efficient and Clean Chemical Utilization, Xi'an 710069, China
2.
Department of Chemistry and Chemistry Engineering, Heze University, He'ze 274015, China

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Corresponding author: Tel: 029-88307657, longxuxulong@163.com
Received Date: 2016-07-18
Rev Recd Date: 2016-09-17

Available Online: 2021-01-23

Publish Date: 2016-12-10

Abstract

Abstract

Xiangyang coal with low ash fusion temperature (AFT) and Jincheng coal with high AFT were used to prepare the blending samples. The influence of Xiangyang coal addition on AFT of Jincheng coal was explored by XRF, SEM, DSC, XRD, and ternary phase diagram analysis. The results show that blending coal can reduce the AFT effectively. The AFT of blending coal is lowered significantly when the adding amount of Xiangyang coal is lower than 24%. Whereas, when the adding amount is between 24% and 40%, AFT of the mixed coal has a slight change and the ash flow temperature is below 1 400℃. A series of chemical reactions among ash composition of mixed coal occur at 1 000-1 200℃, mainly including formation of high melting point compound (mullite) from SiO₂ with A1₂O₃, and that of low melting point compounds (anorthite and hercynite) from the reactions between mullite and CaO or Fe₂O₃. The above reactions mainly cause the changes of ash fusion temperature in blending coal. Based on BP neural network, a prediction model of ash fusion temperature was built. It is proved that the prediction average accuracy by BP neural network is higher than 99%, which is better than that of a previous empirical formula. Furthermore, analysis by thermodynamics software (HSC 5.0) shows that mullite prefers to react with CaO rather than Fe₂O₃.
- coal blending,
- ash fusion temperature,
- BP neural network

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References(18)

References

[1]	谢克昌.绿色低碳持续发展[J].太原理工大学学报, 2010, 41(6):445-448. http://www.cnki.com.cn/Article/CJFDTOTAL-TYGY201005000.htm XIE Ke-chang.Sustainable development on green and low-carbon[J].J Taiyuan Univ Sci Technol, 2010, 41(6):445-448. http://www.cnki.com.cn/Article/CJFDTOTAL-TYGY201005000.htm
[2]	李庆峰, 赵霄鹏, 黄戒介, 房倚天, 王洋.灰融聚流化床粉煤气化技术0.6MPa工业炉运行概况[J].化学工程, 2010, 38(10):123-126. http://www.cnki.com.cn/Article/CJFDTOTAL-IMIY201010028.htm LI Qing-feng, ZhAO Xiao-peng, HUANG Jie-jie, FANG Yi-tian, WANG Yang.Introduction to 0.6MPa industrial gasifier of ash agglomerating fluidized-bed coal gasification technology[J].Chem Eng, 2010, 38(10):123-126. http://www.cnki.com.cn/Article/CJFDTOTAL-IMIY201010028.htm
[3]	许洁, 刘霞, 李德侠, 周志杰, 王辅臣, 于广锁.煤灰流动温度预测模型的研究[J].燃料化学学报, 2012, 40(12):1415-1420. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18077.shtml XU Jie, LIU Xia, LI De-xia, ZHOU Zhi-jie, WANG Fu-chen, YU Guang-suo.Predication model for flow temperature of coal ash[J].J Fuel Chem Technol, 2012, 40(12):1415-1420. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18077.shtml
[4]	陈玉爽, 张忠孝, 乌晓江, 李洁, 管嵘清, 闫博.配煤对煤灰熔融特性影响的实验与量化研究[J].燃料化学学报, 2009, 37(5):521-526. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract17485.shtml CHEN Yu-shuang, ZHANG Zhong-xiao, WU Xiao-jiang, LI Jie, GUAN Rong-qing, YAN Bo.Experimental study on coal ash fusion characteristics of blend coal[J].J Fuel Chem Technol, 2009, 37(5):521-526. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract17485.shtml
[5]	张德祥, 龙永华, 高晋生, 郑斌.煤灰中矿物的化学组成与灰熔融性的关系[J].华东理工大学学报, 2003, 29(6):590-594. http://www.cnki.com.cn/Article/CJFDTOTAL-HLDX200306012.htm ZHANG De-xiang, LONG Yong-hua, GAO Jin-sheng, ZHENG Bin.Relationship between the coal ash fusibility and its chemical composition[J].J East China Univ Sci Technol, 2003, 29(6):590-594. http://www.cnki.com.cn/Article/CJFDTOTAL-HLDX200306012.htm
[6]	刘胜华, 高娜, 郭延红, 杨倩.配煤对煤灰熔融特性的影响[J].煤炭转化, 2014, 37(2):46-49. http://www.cnki.com.cn/Article/CJFDTOTAL-MTZH201403011.htm LIU Sheng-hua, GAO Na, GUO Yan-hong, YANG Qian.Influence of coal blending on ash fusion temperature[J].Coal Convers, 2014, 37(2):46-49. http://www.cnki.com.cn/Article/CJFDTOTAL-MTZH201403011.htm
[7]	GENTILE A L, FOSTER W R.Calcium hexaluminate and its stability relations in the system CaO-Al₂O₃-SiO₂[J].J Am Ceram Soc, 1963, 46(2):74-76. doi: 10.1111/jace.1963.46.issue-2
[8]	刘文胜, 赵虹, 杨建国, 翁善勇, 周永刚, 冯国华, 凌柏林, 郑航.三元相图在配煤结渣特性研究中的应用[J].热力发电, 2009, 5(10):5-10. LIU Wen-sheng, ZHAO Hong, YANG Jian-guo, WENG Shan-yong, ZHOU Yong-gang, FENG Guo-hua, LING Bo-lin, ZHENG Hang.Application of three-element phase diagram in study on slagging behavior of blended coal[J].Therm Power Gener, 2009, 5(10):5-10.
[9]	戴爱军.煤灰成分对灰熔融性影响研究[J].洁净煤技术, 2007, 13(5):23-29. http://www.cnki.com.cn/Article/CJFDTOTAL-JJMS200705006.htm DAI Ai-jun.Investigation on the influence of ash composition for ash fusion temperature[J].Clean Coal Technol, 2007, 13(5):23-29. http://www.cnki.com.cn/Article/CJFDTOTAL-JJMS200705006.htm
[10]	KAHRAMAN H, BOS F, REIFENSTEIN A, COIN C D A.Application of a new ash fusion test to Theodore coals[J].Fuel, 1998, 77(10):1005-1011. https://www.researchgate.net/publication/222983828_Application_of_a_new_ash_fusion_test_to_Theodore_coals
[11]	邓芙蓉.利用TG-DSC、XRD、SEM等多种手段研究煤灰的熔融特性[D].杭州:浙江大学, 2005. DENG Fu-rong.Investigation on ash fusion characteristics using TG-DSC, XRD and SEM[D].Hangzhou:Zhejiang University, 2005.
[12]	徐荣声, 王永刚, 林雄超, 杨萨莎, 艾沙江, 杨远平.配煤和助溶剂降低煤灰熔融温度的矿物学特性研究[J].燃料化学学报, 2015, 43(11):1303-1310. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18723.shtml XU Rong-sheng, WANG Yong-gang, LIN Xiong-chao, YANG Sa-sha, AI Sha-jiang, YANG Yuan-ping.Mineralogical properties of lowering coal ash melting temperature using blending coal and fluxing agent[J].J Fuel Chem Technol, 2015, 43(11):1303-1310. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18723.shtml
[13]	禹立坚, 黄镇宇, 程军, 潘华引, 周俊虎, 岑可发.配煤燃烧过程中煤灰熔融性研究[J].燃料化学学报, 2009, 37(2):139-144. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract17417.shtml YU Li-jian, HUANG Zhen-yu, CHENG Jun, PAN Hua-yin, ZHOU Jun-hu, CEN Ke-fa.Study on the coal ash fusibility during blending coal combustion[J].J Fuel Chem Technol, 2009, 37(2):139-144. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract17417.shtml
[14]	WU X J, ZhANG Z X, PIAO G L, HE X, CHEN Y S, KOBAYASHI N, MORI S, ITAYA Y.Behavior of mineral matters in Chinese coal ash melting during char-CO₂/H₂O gasification reaction[J].Energy Fuels, 2009, 23(5):2420-2428. doi: 10.1021/ef801002n
[15]	丰芸, 李寒旭, 丁立明.利用XRD分析高温下淮南煤灰矿物质变化[J].安徽建筑工业学院学报, 2008, 16(10):53-57. http://www.cnki.com.cn/Article/CJFDTOTAL-AHJG200805015.htm FENG Yun, LI Han-xu, DING Li-ming.Study of huainan coal ash mineral variation under high temperature with XRD[J].J Anhui Inst Archit, 2008, 16(10):53-57. http://www.cnki.com.cn/Article/CJFDTOTAL-AHJG200805015.htm
[16]	李风海, 黄戒介, 房倚天, 王洋.晋城无烟煤流化床气化结渣机理的探索[J].太原理工大学学报, 2010, 41(5):666-669. http://www.cnki.com.cn/Article/CJFDTOTAL-TYGY201005050.htm LI Feng-hai, HUANG Jie-jie, FANG Yi-tian, WANG Yang.Study on fluidized bed gasification slagging mechanism of Jincheng coal[J].J Taiyuan Univ Sci Technol, 2010, 41(5):666-669. http://www.cnki.com.cn/Article/CJFDTOTAL-TYGY201005050.htm
[17]	MATJIE R H, LI Z S, WARD C R, FRENCH D.Chemical composition of glass and crystalline phase in coal gasification[J].Fuel, 2008, 87(6):857-869. doi: 10.1016/j.fuel.2007.05.050
[18]	REITER F M.How sulfur content of coal Relates to ash fusion charaeteristies[J].Power Eng, 1995, 59(5):98-100.