水煤浆宾汉流变特性影响的实验研究  

Experimental investigation on Bingham rheological characteristics of coal-water slurry

作　　者：张磊 肖娟[2] ZHANG Lei;XIAO Juan(Sinopec Nanjing Engineering Co.Ltd.,Nanjing 211100,Jiangsu Province,China;School of Chemical Engineering and Technology,Xi′an Jiaotong University,Xi′an 710049,Shaanxi Province,China)

机构地区：[1]中石化南京工程有限公司,江苏南京211100 [2]西安交通大学化学工程与技术学院,陕西西安710049

出　　处：《化学工程》2021年第3期56-60,72,共6页Chemical Engineering(China)

摘　　要：为探索浓度及温度对水煤浆流变特性的影响规律,文中研究通过配制不同浓度的水煤浆,在不同温度下采用旋转可视化流变仪开展了流变性能测试实验。结果表明:宾汉模型用于表征水煤浆流变特性,适用性高,模型简单。水煤浆的表观黏度随着剪切速率的增加而减小,表现为假塑性流体特征。同时,随着水煤浆浓度的提升,表观黏度逐渐增加,而随着温度的增加,低浓度下水煤浆表观黏度一直降低,而高浓度下水煤浆呈现先减小后增加的趋势。根据宾汉模型中屈服应力和宾汉塑性黏度随水煤浆浓度和温度的变化规律,分别采用幂律关系和Guzman-Andrade公式对宾汉模型进行修正。文中研究提出一种建立浓度及温度依赖的水煤浆流变模型方法,有助于进一步预测水煤浆的表观黏度。In order to study effects of the concentration and temperature on rheological characteristics for coal-water slurry,slurries with different concentrations were prepared and rheological experiment was carried out using intellectual visualization rotational rheometer at different temperatures.The results show that Bingham model is highly applicable and simple to display rheological properties of coal-water slurry.The apparent viscosity decreases with an increase of shear rate,so the coal-water slurry is a pseudoplastic fluid.In addition,with increasing concentration,the apparent viscosity increases.However,when the temperature increases,the apparent viscosity decreases for coal-water slurry with the lower concentration,but it decreases first and then increases for coal-water slurry with the higher concentration.According to effects of the concentration and temperature on yield stress and Bingham plastic viscosity for Bingham model,the power-law relationship and Guzman-Andrade equation are coupled with Bingham model,respectively.The research proposes a new method to obtain rheological models with concentration and temperature dependencies for coal-water slurry,which benefits to predict apparent viscosity of coal-water slurry.

关 键 词：水煤浆 流变特性 宾汉模型 表观黏度 

分 类 号：TQ536[化学工程—煤化学工程]