Effect of moisture on rheological properties of brown coal-oil slurry

ZHAO Bian-bian; BAI Zong-qing; KOU Jia-wei; LI Wen; BAI Jin

Volume 42 Issue 11

Nov. 2014

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Article Navigation > Journal of Fuel Chemistry and Technology > 2014 > 42(11): 1281-1285

ZHAO Bian-bian, BAI Zong-qing, KOU Jia-wei, LI Wen, BAI Jin. Effect of moisture on rheological properties of brown coal-oil slurry[J]. Journal of Fuel Chemistry and Technology, 2014, 42(11): 1281-1285.

Citation:

ZHAO Bian-bian, BAI Zong-qing, KOU Jia-wei, LI Wen, BAI Jin. Effect of moisture on rheological properties of brown coal-oil slurry[J]. Journal of Fuel Chemistry and Technology, 2014, 42(11): 1281-1285.

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Effect of moisture on rheological properties of brown coal-oil slurry

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2014-06-12
Rev Recd Date: 2014-09-24
Publish Date: 2014-11-30

Abstract

Abstract

Yunnan brown coals with different moisture contents were prepared by vacuum-drying and thermostatic and humidistatic treatment, and the effects of moisture on the rheological behavior of brown coal-oil slurries were studied at atmospheric pressure and room temperature(t=19.3 ℃, p=1.01×10⁵ Pa). It is found that the moisture contents in raw coals have influences on the rheological properties of brown coal-oil slurries. The viscosity of the slurry decreases first and then increases with the increase in moisture. The moisture content ω_min at which the lowest viscosity occurs varies with shear rates and coal loadings. ω_min is 9.20% at the shear stress less than 4.4 s^-1 and 7.80% at the shear stress greater than 4.4 s^-1 as the coal concentration is 45.45%. ω_min becomes 7.40% at the shear stress less than 1.32 s^-1 and 10.00% at the shear stress greater than 1.32 s^-1 as the coal concentration is 55.56%. The thixotropy of brown coal-oil slurries is different for different moisture contents, and is enhanced with the decrease in the moisture contents. Brown coal-oil slurries containing moisture of various contents are pseudoplastic fluid, and the moisture contents also have some effects on the parameters of the rheological model.
- brown coal,
- moisture,
- coal-oil slurry,
- rheological properties

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References(19)

References

MIURA K, MAE K, ASHIDA R, TAMURA T, IHARA T. Dewatering of coal through solvent extraction[J]. Fuel, 2002, 81(11/12): 1417-1422.

熊楚安, 王永刚, 许德平. 中国直接液化油煤浆及液化残渣流变特性研究进展[J]. 化工进展, 2009, 28(4): 597-604.(XIONG Chu-an, WANG Yong-gang, XU De-ping. Development of rheological properties of Chinese coal-oil slurry and liquefaction residue in direct liquefaction[J]. Chemical Industry and Engineering Process, 2009, 28(4): 597-604.)

MUNRO J M, LEWELLYN M M, CRACKEL P R, BAUER L G. Characterization of the rheological properties of coal-fuel oil slurries[J]. AIChe J, 1979, 25(2): 355-358.

GRINT A, VEAL C J. Effect of fuel-oil source on the preparation of coal oil dispersions[J]. Fuel, 1985, 64(8): 1079-1084.

OGDEN I K, RUTTER P R. The sedimentation stability and viscosity of coal oil dispersions[J]. Colloid Surface, 1984, 8(3): 249-259.

JOHNSON G R, RUTTER P R. The effect of fuel-oil chemistry on the stability of coal-oil dispersions[J]. Colloid Surf, 1985, 16(2): 103-116.

SAKAKI T, SHIBATA M, HIROSUE H. Effect of coal rank on rheological behavior of coal solvent slurries during heating[J]. Energy Fuels, 1995, 9(2): 314-318.

TSUTSUMI A, YOSHIDA K. Rheological behavior of coal-solvent slurries[J]. Fuel, 1986, 65(7): 906-909.

OKUTANI T, YOKOYAMA S, MAEKAWA Y. Viscosity changes in coal paste during hydrogenation[J]. Fuel, 1984, 63(2): 164-168.

KOU J W, BAI Z Q, LI W, BAI J, GUO Z X. Effects of mineral matters and hydrogen bonding on rheological behaviors of brown coal-oil slurries[J]. Fuel, 2014, 132: 187-193.

SONG C S, SAINI A K, MCCONNIE J. Strong promoting effect of H₂O on coal liquefaction using water-soluble and oil-soluable mo catalyst precursors[D]. Oviedu, Spain: Int Energy Agcy, 1995.

SONG C S, SAINI A K, SCHOBERT H H. Enhancing low-severity catalytic liquefaction of low-rank coal by adding water[J]. Fuel, 1993, 206: 1031-1038.

王永刚, 陈伟, 丁一慧, 郝丽芳, 许德平. 溶剂和水分对液化油煤浆流变性质的影响[J]. 煤炭学报, 2009, 34(1): 100-104.(WANG Yong-gang, CHEN Wei, DING Yi-hui, HAO Li-fang, XU De-ping. Effect of solvent and moisture on rheological property of oil-coal slurry[J]. Journal of China Coal Society, 2009, 34(1): 100-104.)

ADIGA K C, PITHAPURWALA Y K, SHAH D O, MOUDGIL B M. Rheology of coal slurries in no.2 oil and ethanol blends: Effect of water[J]. Rheologica Acta, 1983, 22(4): 402-409.

FENG P, HAO L F, HUO C F, WANG Z, LIN W G, SONG W L. Rheological behavior of coal bio-oil slurries[J]. Energy, 2014, 66: 744-749.

YANG X L, LI Y F, ZHANG X W, HU S Q. Supportvectorregression on near-infrared spectra analysis for moisture determination in lignitic coal samples[D]. Taiwan, China: Chung Hua University, 2013.

熊程程. 褐煤干燥过程的实验研究及动力学分析[D]. 北京: 中国科学院工程热物理研究所, 2011.(XIONG Cheng-cheng. Experimental study and kinetic analysis of lignite drying[D]. Beijing: Institute of Engineering Thermophysics, Chinese Academy of Sciences, 2011.)

LOW G S, BHATTACHARYA S N. The effect of moisture on the rheology of brown coal-oil suspensions[J]. Can J Chem Eng, 1983, 61(6): 785-790.

史士东. 煤加氢液化工程学基础[M]. 北京: 化学工业出版社, 2012.(SHI Shi-dong. Coal hydrogenation liquefaction of foundation engineering[M]. Beijing: Chemical Industry Press, 2012.)

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