褐煤中水分对油煤浆流变性质的影响

赵变变; 白宗庆; 寇佳伟; 李文; 白进

褐煤中水分对油煤浆流变性质的影响

1.
中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001;
2.
中国科学院大学, 北京 100049

基金项目: 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); 国家重点基础研究发展规划(973计划, 2011CB201401); 中国科学院战略性先导科技专项(XDA07060100).

详细信息

通讯作者:
白宗庆, Tel: 0351-4040289, E-mail: baizq@sxicc.ac.cn

中图分类号: TQ530
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出版历程
- 收稿日期: 2014-06-12
- 修回日期: 2014-09-24
- 刊出日期: 2014-11-30

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

摘要

摘要: 针对云南褐煤,用真空干燥脱水和恒温恒湿箱处理获得了不同含水率的褐煤,在常温常压(t=19.3 ℃,p=1.01×10⁵ Pa)条件下研究了褐煤含水率对油煤浆流变特性的影响.研究表明,原料煤含水率对油煤浆黏度和流变特性有一定的影响.随褐煤含水率增加,油煤浆黏度先减小后增加.油煤浆浓度不同,剪切速率不同,黏度出现最低值的含水率值w_min也不同.浓度为45.45%的油煤浆,剪切速率小于4.4 s^-1时,w_min为9.20%;剪切速率大于4.4 s^-1时,w_min为7.80%.浓度为55.56%的油煤浆,剪切速率小于1.32 s^-1时,w_min为7.40%;剪切速率大于1.32 s^-1时,w_min为10.00%.随剪切速率变化,油煤浆黏度上下行曲线之间形成滞后环,表明油煤浆体系有触变性,并且不同含水率煤浆体系触变性不同,含水率越大,触变性越明显.实验中不同含水率褐煤油煤浆都属于假塑性流体,且含水率对模型参数有一定的影响.
- 褐煤 /
- 水分 /
- 油煤浆 /
- 流变性
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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参考文献(19)

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