印尼褐煤湿煤末(煤泥)壁面滑移和真实流变特性

True rheological properties and wall slip of Indonesian lignite washery tailing suspensions

通过流量-压力降法探讨了印尼褐煤湿煤末（煤泥）浆体在管道输送中的流变特性,得出其实测流变特性。通过改进的Mooney滑移修正方法对实测流变特性进行修正,得到其真实流变模型,并分析了浆体浓度对滑移和流变特性的影响。结果表明,只有当浆体壁面剪切应力超过临界剪切应力后,滑移才会产生,且临界剪切应力随浆体浓度的增大而增大。根据浆体滑移和流变特性的不同可以将浆体分为3个浓度区域：低浓度区（39.24%～41.48%）、中高浓度区（42.32%～43.33%）和高浓度区（44.81%～46.21%）。随着浆体的浓度增大,其黏度也增大,非牛顿特征明显。

The rheological properties of lignite washery tailing suspensions（LWTS） were studied in this paper throughpipeline transportation usingQ-DPmethod. The rheological properties were modified based on the modified Mooneymethod to obtain the true rheological properties of LWTS. Moreover,the effect of mass concentration on the wall slipand rheological properties of LWTS were also analyzed. The results show that only when wall shear stress exceeds thecritical wall shear stress can wall slip occur. The critical wall shear stress increases with the increase of concentration.Three concentration ranges of LWTS are obtained according to their differences in rheological aspects,i. e.,low con-centration zone（39. 24%-41. 48%）,middle concentration zone（42. 32%-43. 33%） and high concentration zone（44. 81%-46. 21%）. The viscosity of LWTS also increases with the increase of concentration.