Ash fusion and viscosity behavior of coal ash with high content of Fe and Ca

HU Xiao-fei; GUO Qing-hua; LIU Xia; GONG Yan; YU Guang-suo

Volume 44 Issue 7

Jul. 2016

Turn off MathJax

Article Contents

Article Navigation > Journal of Fuel Chemistry and Technology > 2016 > 44(7): 769-776

HU Xiao-fei, GUO Qing-hua, LIU Xia, GONG Yan, YU Guang-suo. Ash fusion and viscosity behavior of coal ash with high content of Fe and Ca[J]. Journal of Fuel Chemistry and Technology, 2016, 44(7): 769-776.

Citation:

HU Xiao-fei, GUO Qing-hua, LIU Xia, GONG Yan, YU Guang-suo. Ash fusion and viscosity behavior of coal ash with high content of Fe and Ca[J]. Journal of Fuel Chemistry and Technology, 2016, 44(7): 769-776.

Citation:

PDF( 7899 KB)

Ash fusion and viscosity behavior of coal ash with high content of Fe and Ca

HU Xiao-fei^{1, 2},
GUO Qing-hua^{1, 2},
LIU Xia^{1, 2},
GONG Yan^{1, 2},
YU Guang-suo^{1, 2
,
,}

1.
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
2.
Collaborative Innovation Center of Chemical Technology for Coal Based Energy, Shanghai 200237, China

Funds:

The project was supported by the National Natural Science Foundation of China 51406056

the Fundamental Research Funds for the Central Universities 222201514336

the Fundamental Research Funds for the Central Universities 222201414030

the Shanghai Pujiang Program 15PJD011

More Information

Corresponding author: YU Guang-suo, Tel:0351-4044287, E-mail:gsyu@ecust.edu.cn
Received Date: 2016-01-27
Rev Recd Date: 2016-04-26

Available Online: 2021-01-23

Publish Date: 2016-07-10

Abstract

Abstract

Jinjitan coal and sand were respectively chosen as raw material and additive. Under the different proportion of additive, ash fusion and viscosity behavior of coal ash with high contents of Fe and Ca were studied. X-ray diffraction (XRD), high-temperature stage microscope (HTSM) and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) were applied to investigate effect of mineral transformation on ash fusion and viscosity behavior of coal ash. The results show that ash fusion temperature decreases at first and then increases with the rising content of additive, and formation of low temperature eutectic augite is the main reason for the lower ash fusion temperature. The viscosity fluctuation is related to the formation of gehlenite, and the precipitation of iron-bearing minerals causes significant increase of viscosity. The temperature of critical viscosity (t_cv) of coal ash slag drops dramatically and the slag type transforms from crystal slag to glass slag with addition of sand. Distribution of Fe and Ca shows obvious different in raw coal slag, but additive makes it become more uniform, which is in agreement with the viscosity curve. Moreover, the industrial results prove that sand is an effective additive to improve the viscosity behavior of coal ash with high content of Fe and Ca.
- high-calciu-high-iron coal,
- ash fusion temperature,
- viscosity-temperature behavior,
- slag

FullText(HTML)

References(20)

References

[1]	于广锁, 牛苗任, 王亦飞, 梁钦锋, 于遵宏.气流床煤气化的技术现状和发展趋势[J].现代化工, 2004, 24(5): 23-26. http://www.cnki.com.cn/Article/CJFDTOTAL-XDHG200405007.htm YU Guang-suo, NIU Miao-ren, WANG Yi-fei, LIANG Qin-feng, YU Zun-hong. Application status and development tendency of coal entrained-bed gasification[J]. Mod Chem Ind, 2004, 24(5): 23-26. http://www.cnki.com.cn/Article/CJFDTOTAL-XDHG200405007.htm
[2]	PATTERSON J H, HURST H J. Ash and slag qualities of Australian bituminous coals for use in slagging gasifiers[J]. Fuel, 2000, 79(13): 1671-1678. doi: 10.1016/S0016-2361(00)00032-6
[3]	VAN DYK J C, BENSON S A, LAUMB M L, WAANDERS B. Coal and coal ash characteristics to understand mineral transformations and slag formation[J]. Fuel, 2009, 88(6): 1057-1063. doi: 10.1016/j.fuel.2008.11.034
[4]	周志杰, 李德侠, 刘霞, 于广锁.煤灰熔融黏温特性及对气流床气化的适应性[J].化工学报, 2012, 63(10): 3243-3254. http://www.cnki.com.cn/Article/CJFDTOTAL-HGSZ201210036.htm ZHOU Zhi-jie, LI De-xia, LIU Xia, YU Guang-suo. Characteristic of cohesiveness-temperature of coal molten ash and its adaptability to entrained flow gasifier[J]. CIESC J, 2012, 63(10): 3243-3254. http://www.cnki.com.cn/Article/CJFDTOTAL-HGSZ201210036.htm
[5]	SONG W J, DONG Y H, WU Y Q, ZHU Z B. Prediction of temperature of critical viscosity for coal ash slag[J]. AIChE J, 2011, 57(10): 2921-2925. doi: 10.1002/aic.v57.10
[6]	SONG W J, SUN Y M, WU Y Q, ZHU Z B. Measurement and simulation of flow properties of coal ash slag in coal gasification[J]. AIChE J, 2011, 57(3): 801-818. doi: 10.1002/aic.12293
[7]	KONG L X, BAI J, LI W, LI X M, BAI Z Q, GUO Z X, LI H Z. The internal and external factor on coal ash slag viscosity at high temperatures, Part 1: Effect of cooling rate on slag viscosity, measured continuously[J]. Fuel, 2015, 158: 968-975. doi: 10.1016/j.fuel.2015.02.055
[8]	KONG L X, BAI J, LI W, BAI Z Q, GUO Z X, LI H Z. The internal and external factor on coal ash slag viscosity at high temperatures, Part 2: Effect of residual carbon on slag viscosity[J]. Fuel, 2015, 158: 976-982. doi: 10.1016/j.fuel.2015.06.055
[9]	KONG L X, BAI J, BAI Z Q, LL W. Effects of CaCO₃ on slag flow properties at high temperatures[J]. Fuel, 2013, 109: 76-85. doi: 10.1016/j.fuel.2012.11.014
[10]	XUAN W W, WHITTY K J, GUAN Q L, BI D P, ZHAN Z H, ZHANG J S. Influence of Fe₂O₃ and atmosphere on crystallization characteristics of synthetic coal slags[J]. Energy Fuels, 2014, 29(1): 405-412.
[11]	XUAN W W, WHITTY K J, GUAN Q L, BI D P, ZHAN Z H, ZHANG J S. Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag[J]. Fuel, 2014, 137: 193-199. doi: 10.1016/j.fuel.2014.07.092
[12]	XUAN W W, WHITTY K J, GUAN Q L, BI D P, ZHAN Z H, ZHANG J S. Influence of SiO₂/Al₂O₃ on crystallization characteristics of synthetic coal slags[J]. Fuel, 2015, 144: 103-110. doi: 10.1016/j.fuel.2014.11.091
[13]	张龙, 黄镇宇, 沈铭科, 王智化, 周俊虎.不同的灰熔点调控方式对煤灰熔融特性的影响[J].燃料化学学报, 2015, 43(2): 145-152. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18568.shtml ZHANG Long, HUANG Zhen-yu, SHEN Ming-ke, WANG Zhi-hua, ZHOU Jun-hu. Effect of different regulative methods on coal ash fusion characteristics[J]. J Fuel Chem Technol, 2015, 43(2): 145-152. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18568.shtml
[14]	陆宏权, 李寒旭, 马飞, 孟莹, 贾春林.钙基助熔剂对煤灰熔融性影响及熔融机理研究[J].煤炭科学技术, 2011, 39(2): 111-118. http://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201102029.htm LU Hong-quan, LI Han-xu, MA Fei, MENG Ying, JIA Chun-lin. Study on fly ash fusibility affected by calcium base flux and fusion mechanism[J]. Coal Sci Technol, 2011, 39(2): 111-118. http://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201102029.htm
[15]	赵锋, 龚岩, 刘霞, 许洁, 于广锁.神府煤低温灰与高温灰的高温熔融特征[J].中国电机工程学报, 2015, 35(5): 1161-1168. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201505017.htm ZHAO Feng, GONG Yan, LIU Xia, XU Jie, YU Guang-suo. Fusion characteristics at high temperature of low temperature ash and high temperature ash of Shenfu coal[J]. Proc CSEE, 2015, 35(5): 1161-1168. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201505017.htm
[16]	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, 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 fusion characteristics[J]. J Fuel Chem Technol, 2014, 42(1): 20-25. http://rlhxxb.sxicc.ac.cn/CN/abstract/abstract18327.shtml
[17]	代百乾, 乌晓江, 陈玉爽, 张忠孝.煤灰熔融行为及其矿物质作用机制的量化研究[J].动力工程学报, 2014, 34(1): 70-76. http://www.cnki.com.cn/Article/CJFDTOTAL-DONG201401012.htm DAI Bai-qian, WU Xiao-jiang, CHEN Yu-shuang, ZHANG Zhong-xiao. Experimental study and quantum chemistry calculation on coal ash fusion behavior and related mineral evolution mechansium[J]. J Chin Soc Power Eng, 2014, 34(1): 70-76. http://www.cnki.com.cn/Article/CJFDTOTAL-DONG201401012.htm
[18]	李德霞, 周志杰, 郭庆华, 于广锁.榆林煤熔融特性及粘温特性[J].化工学报, 2012, 63(1): 9-16. LI De-xia, ZHOU Zhi-jie, GUO Qing-hua, YU Guang-suo. Ash fusion and viscosity-temperature characteristics of Yulin coal[J]. CIESC J, 2012, 63(1): 9-16.
[19]	许洁, 刘霞, 张庆, 赵锋, 郭庆华, 于广锁, 王辅臣.高钙山鑫煤灰熔融及黏温特性分析[J].中国电机工程学报, 2013, 33(20): 46-51. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201320008.htm XU Jie, LIU Xia, ZHANG Qing, ZHAO Feng, GUO Qing-hua, YU Guang-suo, WANG Fu-chen. Reseaech on ash fusibility and viscosity-temperature characteristic of high-calcium Shanxin coal ash[J]. Proc CSEE, 2013, 33(20): 46-51. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201320008.htm
[20]	VARGAS S, FRANDSEN F J, DAM-JOHANSEN K. Rheological properties of high-temperature melts of coal ashes and other silicates[J]. Prog Energy Combust Sci, 2001, 27(3): 237-429. doi: 10.1016/S0360-1285(00)00023-X