Rheological properties of coal ash at high temperatures

YUAN Hai-ping; LIANG Qin-feng; LIU Hai-feng; GONG Xin

Volume 40 Issue 10

Oct. 2012

Turn off MathJax

Article Contents

Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(10): 1167-1171

YUAN Hai-ping, LIANG Qin-feng, LIU Hai-feng, GONG Xin. Rheological properties of coal ash at high temperatures[J]. Journal of Fuel Chemistry and Technology, 2012, 40(10): 1167-1171.

Citation:

YUAN Hai-ping, LIANG Qin-feng, LIU Hai-feng, GONG Xin. Rheological properties of coal ash at high temperatures[J]. Journal of Fuel Chemistry and Technology, 2012, 40(10): 1167-1171.

YUAN Hai-ping, LIANG Qin-feng, LIU Hai-feng, GONG Xin. Rheological properties of coal ash at high temperatures[J]. Journal of Fuel Chemistry and Technology, 2012, 40(10): 1167-1171.

Citation:

YUAN Hai-ping, LIANG Qin-feng, LIU Hai-feng, GONG Xin. Rheological properties of coal ash at high temperatures[J]. Journal of Fuel Chemistry and Technology, 2012, 40(10): 1167-1171.

PDF( 561 KB)

Rheological properties of coal ash at high temperatures

Key Laboratory of Coal Gasification of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received Date: 2011-12-13
Rev Recd Date: 2012-02-23
Publish Date: 2012-10-31

Abstract

Abstract

Four coal samples including Shenmu coal from Shaanxi, Nalingou coal from Inner Mongolia, Yangchangwan coal from Ningxia and Nantun coal from Shandong were prepared for the research on the rheological properties of coal ash at high temperatures. The high temperature rotational viscometer was used to study the effect of shear rate on the shear stress and viscosity of coal ash. The results indicate that the coal ash slag falls into a Newtonian fluid when the temperature is above the liquidus temperature, while it gradually turns into non-Newtonian fluid when the temperature is below the liquidus temperature. Shenmu and Yangchangwan coal ash owns the plastic and shear-thicking characteristics, while Nalingou and Nantun coal ash has the pseudoplastic and shear-thinning characteristics. Meanwhile, the crystals are formed with the decrease of temperature, which makes the yield stress increase and the flowability of coal ash slag decrease.
- coal ash,
- viscosity,
- rheological properties,
- yield stress

FullText(HTML)

References(14)

References

高健, 倪维斗, 小山智规. IGCC系统中空气气化炉与氧气气化炉的对比研究[J]. 燃气轮机技术, 2007, 20(2): 1-5, 41. (GAO Jian, NI Wei-dou, KOYAMA Y. Comparison about air-blown gasifier and oxygen-blown gasifier[J]. Gas Turbine Technology, 2007, 20(2): 1-5, 41.)

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.

孙亦騄. 煤中矿物杂质对锅炉的危害[M]. 北京: 水利电力出版社, 1994. (SUN Yi-lu. Harm of mineral impurity in coal to boiler[M]. Beijing: China Water and Power Press, 1994.)

熊友辉, 孙学信. 基于熔体结构的高温灰渣粘度模型[J]. 华中理工大学学报, 1998, 26(10): 79-81. (XIONG You-hui, SUN Xue-xin. A viscosity model of slag under high temperature based on the melt structure[J]. Journal of Huazhong University of Science and Technology, 1998, 26(10): 79-81.)

熊友辉, 孙学信. 高温灰渣的塑性流体特性研究[J]. 华中理工大学学报, 2000, 28(10): 100-101. (XIONG You-hui, SUN Xue-xin. The plastic-viscosity of slag under a high temperature[J]. Journal of Huazhong University of Science and Technology, 2000, 28(10): 100-101.)

JOHNSON E. K. A non-Newtonian flow model for coal-ash slag[J]. J Eng Gas Turbines Power, 1984, 106(4): 778-781.

郭宗奇. 煤灰渣及其与耐火材料在煤气化环境中的行为[J]. 硅酸盐通报, 1991, 10(6): 16-20. (GUO Zong-qi. Behavior of coal slag and refractory in coal gasification environment[J]. Bulletin of the Chinese Ceramic Society, 1991, 10(6): 16-20.)

TONMUKAYAKUL N, NGUYEN Q D. A new rheometer for direct measurement of the flow properties of coal ash at high temperatures[J]. Fuel, 2002, 81(4): 397-404.

SOMERVILLE M, WRIGHT S, SUN S, JAHANSHAHI S. Liquidus temperature and viscosity of melter slags//VII International Conference on Molten Slags, Fluxes and Salts. Capetown, SA. Johannesburg: South African Institute of Mining and Metallurgy, 2004: 219-224.

宋文佳, 孙以敏, 吴勇强, 朱子彬, 梁少球. 中国神木煤灰渣在高温下的流变特性[J]. 化工学报, 2010, 61(2): 310-316. (SONG Wen-jia, SUN Yi-min, Wu Yong-qiang, ZHU Zi-bin, LIANG Shao-qiu. Rheological characteristics of Chinese Shenmu coal ash slag at high-temperature[J]. Journal of Chemical Industry and Engineering(China), 2010, 61(2): 310-316.)

WATT J D. Flow properties of slag formed from the ashes of British coals: Part 2 The crystallizing behaviour of the slags[J]. J Inst Fuel, 1969, 42: 131-134.

HOFFMAN R L. Explanations for the cause of shear thickening in concentrated colloidal suspensions[J]. J Rheol, 1998, 42(1): 111-123.

BRADY J F, BOSSIS G. The rheology of concentrated suspensions of spheres in simple shear flow by numerical simulation[J]. J Fluid Mech, 1985, 155: 105-129.

BROWN E, FORMAN N A, ORELLANA C S, ZHANG H, MAYNOR B M, BETTS D E, DESIMONE J M, JAEGER H M. Generality of shear thickening in dense suspensions[J]. Nat Mater, 2010, 9(3): 220-224.

Relative Articles

Supplements(0)

Cited By

Proportional views