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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. shu

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

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

Corresponding author: BAI Zong-qing,
Received Date: 12 June 2014
Available Online: 24 September 2014
Fund Project: 国家自然科学基金委员会与神华集团有限责任公司联合资助(U1261209) (U1261209) 国家重点基础研究发展规划(973计划, 2011CB201401) (973计划, 2011CB201401) 中国科学院战略性先导科技专项(XDA07060100). (XDA07060100)

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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