Relationship between coal ash fusibility and ash composition in terms of mineral changes

WANG Yang; LI Hui; WANG Dong-xu; DONG Chang-qing; LU Qiang; LI Wen-yan

Volume 44 Issue 9

Sep. 2016

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Article Navigation > Journal of Fuel Chemistry and Technology > 2016 > 44(9): 1034-1042

WANG Yang, LI Hui, WANG Dong-xu, DONG Chang-qing, LU Qiang, LI Wen-yan. Relationship between coal ash fusibility and ash composition in terms of mineral changes[J]. Journal of Fuel Chemistry and Technology, 2016, 44(9): 1034-1042.

Citation:

WANG Yang, LI Hui, WANG Dong-xu, DONG Chang-qing, LU Qiang, LI Wen-yan. Relationship between coal ash fusibility and ash composition in terms of mineral changes[J]. Journal of Fuel Chemistry and Technology, 2016, 44(9): 1034-1042.

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Relationship between coal ash fusibility and ash composition in terms of mineral changes

1.
National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
2.
School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Funds:

National Nature Science Foundation of China 51276062

the Major State Basic Research Development Program of China 973 program

the Major State Basic Research Development Program of China 2015CB251501

the Fundamental Research Funds for the Central Universities 2015ZZD02

Received Date: 2016-04-15
Rev Recd Date: 2016-06-05

Available Online: 2021-01-23

Publish Date: 2016-09-10

Abstract

Abstract

Coal ash and synthetic ash samples were used to detect effect of different ash components on ash fusion temperatures (AFTs). Thermodynamic database FactSage 7.0 was applied to simulate the melting process of ashes with different compositions, in order to provide theoretical basis for effect of ash components on ash fusibility. The reducing effect of Na₂O on AFTs is due to the replacement of anorthite by albite and nepheline. The increasing content of MgO can initially lower and then raise the AFTs. When MgO exceeds certain content, forsterite is generated and raise the AFTs. The raising effect of sulfur on AFTs is due to the replacement of diopside by forsterite and calcium sulfate. The increasing content of CaO can also initially lower and then raise the AFTs. When CaO exceeds certain level, Si migrates from minerals with low melting points to those with higher melting points, thus raising the AFTs. Na₂O is prior to CaO when being bound with silica-oxygen units to form minerals. The priority order of the oxides when being bound with CaO and silica-oxygen units is: Al₂O₃ > MgO > Fe₂O₃.
- ash fusibility,
- mineral conversion,
- thermodynamic simulation

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References(20)

References

[1]	CROMPTON P, WU Y R. Energy consumption in China: Past trends and future directions[J]. Energy Econ, 2005, 27(1): 195-208. doi: 10.1016/j.eneco.2004.10.006
[2]	CHEN W Y, XU R N. Clean coal technology development in China[J]. Energy Policy, 2010, 38(5): 2123-2130. doi: 10.1016/j.enpol.2009.06.003
[3]	AINETOM, ACOSTAA, RINCONJ M, ROMERO M.Thermal expansion of slag and fly ash from coal gasification in IGCC power plant[J]. Fuel, 2006, 85(16): 2352-2358. doi: 10.1016/j.fuel.2006.05.015
[4]	张利孟, 董信光, 刘科, 谭厚章, 王学斌, 魏博.高岭土对准东煤结渣特性及矿物质演变的影响[J].燃料化学学报, 2015, 43(10): 1176-1181. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18706.shtml ZHANG Li-meng, DONG Xin-guang, LIU Ke, TAN Hou-zhang, WANG Xue-bin, WEI Bo.Effect of kaolin on ash slagging and mineral conversion of Zhundong coal[J]. J Fuel Chem Technol, 2015, 43(10): 1176-1181. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18706.shtml
[5]	张杰, 冯玉朝, 张志辉.锅炉结渣原因分析及预防措施[J].锅炉技术, 2008, 39(5): 57-59. http://www.cnki.com.cn/Article/CJFDTOTAL-GYGL201001014.htm ZHANG Jie, FENG Yu-zhao, ZHANG Zhi-hui. Boiler slagging reason analysis and prevention measures[J]. Boiler Technol, 2008, 39(5): 57-59. http://www.cnki.com.cn/Article/CJFDTOTAL-GYGL201001014.htm
[6]	宋文佳.高温煤气化炉中煤灰熔融, 流动和流变行为特性研究[D].上海:华东理工大学, 2011. SONG Wen-jia. Fusibility, flow characteristics and rheological properties of coal ash in the ultra-high temperature gasifier[D]. Shanghai: East China University Science and Technology, 2011.
[7]	马岩, 黄镇宇, 唐慧儒, 王智化, 周俊虎, 岑可法.准东煤灰化过程中的矿物演变及矿物添加剂对其灰熔融特性的影响[J].燃料化学学报, 2014, 42(1): 20-25. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18327.shtml MA Yan, HUANG Zhen-yu, TANG Hui-ru, WANG Zhi-hua, ZHOU Jun-hu, CEN Ke-fa. Mineral conversion of Zhundong coal during ashing process and the effect of mineral additives on its ahs fusion characteristics[J]. J Fuel Chem Technol, 2014, 42(1): 20-25. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18327.shtml
[8]	SONG W J, TANG L H, ZHU X D, WU Y Q, RONG Y Q, ZHU Z B, KOYAMA S. Fusibility and flow properties of coal ash and slag[J]. Fuel, 2009, 88(2): 297-304. doi: 10.1016/j.fuel.2008.09.015
[9]	SONG W J, TANG L H, ZHU X D, WU Y Q, ZHU Z B, KOYAMA S. Prediction of Chinese coal ash fusion temperatures in Ar and H₂ atmospheres[J]. Energy Fuels, 2009, 23(4): 1990-1997. doi: 10.1021/ef800974d
[10]	LIU B, HE Q H, JIANG Z H, XU R F, HU B X. Relationship between coal ash composition and ash fusion temperatures[J]. Fuel, 2013, 105: 293-300. doi: 10.1016/j.fuel.2012.06.046
[11]	SEGGIANI M. Empirical correlations of the ash fusion temperatures and temperature of critical viscosity for coal and biomass ashes[J]. Fuel, 1999, 78(9): 1121-1125. doi: 10.1016/S0016-2361(99)00031-9
[12]	王云刚, 赵钦新, 马海东, 姜薇薇.准东煤灰熔融特性试验研究[J].动力工程学报, 2013, 33(11): 841-846. http://www.cnki.com.cn/Article/CJFDTOTAL-DONG201311003.htm WANG Yun-gang, ZHAO Qin-xin, MA Hai-dong, JIANG Wei-wei. Experimental study on ash fusion characteristics of Zhundong coal[J]. J Chin Soc Power Eng, 2013, 33(11): 841-846. http://www.cnki.com.cn/Article/CJFDTOTAL-DONG201311003.htm
[13]	杨光, 张彦威, 寇希文, 周志军, 王智化, 周俊虎, 岑可法.燃用准东煤电站锅炉灰沉积形成过程中的矿物演变与热力学模拟[J].燃料化学学报, 2015, 43(10): 1182-1187. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18707.shtml YANG Guang, ZHANG Yan-wei, KOU Xi-wen, ZHOU Zhi-jun, WANG Zhi-hua, ZHOU Jun-hu, CEN Ke-fa. Mineral conversion and thermodynamic simulation of ash deposition during Zhundong coal combustion in boiler of thermal power plant[J]. J Fuel Chem Technol, 2015, 43(10): 1182-1187. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18707.shtml
[14]	马永静.矿物学角度研究添加剂对煤灰熔融性的作用及其机理[D].太原:太原理工大学, 2012. MA Yong-jing. Study the effect of addictives on the fusibility of coal ash and its mechanism from a mineralogical point of view[D]. Taiyuan: Taiyuan University of Technology, 2012.
[15]	芦涛, 张雷, 张晔, 丰芸, 李含旭.煤灰中矿物质组成对煤灰熔融温度的影响[J].燃料化学学报, 2010, 38(1): 23-28. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract17532.shtml LU Tao, ZHANG Lei, ZHANG Ye, FENG Yun, LI Han-xu. Effect of mineral composition on coal ash fusion temperature[J]. J Fuel Chem Technol, 2010, 38(1): 23-28. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract17532.shtml
[16]	LI F, QIU J R, ZHENG C G, HU Y. The fusion characteristics and mineral species of blended coal ash[J]. J Eng Thermophys, 1998, 19: 112-116.
[17]	WANG Y, XIANG Y, WANG D X, DONG C Q, YANG Y P, XIAO X B, LU Q, ZHAO Y. Effect of sodium oxides in ash composition on ash fusibility[J]. Energy Fuels, 2016, 30(2): 1437-1444. https://www.researchgate.net/publication/292072975_Effect_of_Sodium_Oxides_in_Ash_Composition_on_Ash_Fusibility
[18]	陈晓东, 孔令学, 白进, 白宗庆, 李文.高温气化条件下Na₂O对煤灰中矿物质演化行为的影响[J].燃料化学学报, 2016, 44(3): 263-272. doi: 10.1016/S1872-5813(16)30015-9 CHEN Xiao-dong, KONG Ling-xue, BAI Jin, BAI Zong-qing, LI Wen. Effect of Na₂O on mineral transformation of coal ash under high temperature gasification condition[J]. J Fuel Chem Technol, 2016, 44(3): 263-272. doi: 10.1016/S1872-5813(16)30015-9
[19]	高峰, 马永静. Mg²⁺和Na⁺对高熔点煤灰熔融性的影响[J].燃料化学学报, 2012, 40(10): 1161-1166. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18038.shtml GAO Feng, MA Yong-jing.Study on the effect of Mg²⁺ and Na⁺ on the fusibility of coal ash with high ash fusion point[J]. J Fuel Chem Technol, 2012, 40(10): 1161-1166. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18038.shtml
[20]	SONG W J, TANG L H, ZHU X D, WU Y Q, ZHU Z B, KOYAMA S. Effect of coal ash composition on ash fusion temperatures[J]. Energy Fuels, 2009, 24(1): 182-189. https://www.researchgate.net/publication/231274320_Effect_of_Coal_Ash_Composition_on_Ash_Fusion_Temperatures