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Rheological Properties of High Concentration Coal Slime
ACS Omega ( IF 3.7 ) Pub Date : 2024-01-26 , DOI: 10.1021/acsomega.3c08319 Weixiong Zheng 1 , Hai Jiang 1 , Jiameng Cheng 1 , JiaLu Du 2 , Fuyan Lyu 3 , Shanshun Wang 1 , Miao Wu 1
ACS Omega ( IF 3.7 ) Pub Date : 2024-01-26 , DOI: 10.1021/acsomega.3c08319 Weixiong Zheng 1 , Hai Jiang 1 , Jiameng Cheng 1 , JiaLu Du 2 , Fuyan Lyu 3 , Shanshun Wang 1 , Miao Wu 1
Affiliation
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Concentrated coal slime serves as a clean and promising fluid fuel and is commonly employed via pipeline transportation. Currently, there are still limitations in understanding the rheological properties of coal slime, including its yield stress, viscoelasticity, and the impact of factors, such as temperature, on these properties. Therefore, we conducted tests to examine the rheological properties and yield stress of coal slime at various temperatures for two different concentrations using a pipeline transportation system and rheometers. Furthermore, due to the challenges in measuring dynamic yield stress caused by the shear bands of highly viscous slime, a method using the residual pressure inside the pipeline after cessation of transportation is proposed. The viscoelasticity of coal slime at various temperatures was examined through oscillatory shear tests. Finally, the pressure wave velocity in the pipeline transportation system was used to determine the bulk modulus. The results indicated that the shear stress under high shear rates decreased with an increase in temperature, while the yield stress and shear stress under low shear conditions gradually increased with temperature. The coal slime exhibited certain viscoelasticity with shear elasticity increasing as the temperature rose. The pressure wave velocity in the pipeline remained constant and did not vary significantly with temperature.
中文翻译：
高浓度煤泥的流变特性
浓缩煤泥是一种清洁且有前景的流体燃料，通常通过管道运输使用。目前，对煤泥流变特性的了解仍然存在局限性，包括其屈服应力、粘弹性以及温度等因素对这些特性的影响。因此，我们利用管道输送系统和流变仪进行了测试，研究了不同温度、两种不同浓度的煤泥的流变特性和屈服应力。此外，由于测量高粘性煤泥剪切带引起的动态屈服应力的挑战，提出了一种利用停止输送后管道内残余压力的方法。通过振荡剪切试验研究了不同温度下煤泥的粘弹性。最后，利用管道输送系统中的压力波速度来确定体积模量。结果表明，高剪切速率下的剪应力随着温度的升高而减小，而低剪切条件下的屈服应力和剪应力则随着温度的升高而逐渐增大。煤泥表现出一定的粘弹性，剪切弹性随温度升高而增大。管道内压力波速保持恒定，不随温度变化明显。
更新日期：2024-01-26
中文翻译：
高浓度煤泥的流变特性
浓缩煤泥是一种清洁且有前景的流体燃料，通常通过管道运输使用。目前，对煤泥流变特性的了解仍然存在局限性，包括其屈服应力、粘弹性以及温度等因素对这些特性的影响。因此，我们利用管道输送系统和流变仪进行了测试，研究了不同温度、两种不同浓度的煤泥的流变特性和屈服应力。此外，由于测量高粘性煤泥剪切带引起的动态屈服应力的挑战，提出了一种利用停止输送后管道内残余压力的方法。通过振荡剪切试验研究了不同温度下煤泥的粘弹性。最后，利用管道输送系统中的压力波速度来确定体积模量。结果表明，高剪切速率下的剪应力随着温度的升高而减小，而低剪切条件下的屈服应力和剪应力则随着温度的升高而逐渐增大。煤泥表现出一定的粘弹性，剪切弹性随温度升高而增大。管道内压力波速保持恒定，不随温度变化明显。
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