摘要
为探究初始料浆温度变化对超细尾砂料浆流变参数的影响及管道内料浆温度分布特征,开展了超细尾砂料浆流变试验,进行了料浆流动传热仿真试验,推导了流变参数预测模型及管输温度分布计算模型。结果表明:料浆温度与超细尾砂料浆屈服应力、塑性黏度均遵循Exponential Decay 2拟合模型;不同料浆初始温度下管径与管道内料浆温度符合Asym2sig拟合模型,将其模型参数与管径进行深度拟合分析,利用管径表示拟合模型中的变化参量,实现了变量的统一;超细尾砂料浆流动时摩擦生热高于水化产热,依据传热学理论,超细尾砂料浆经管道内摩擦产热传热、水化产热传热以及与外界环境交换传热后达到动态平衡;基于流变参数预测模型及管道内温度分布模型,可在已知管径、料浆初始温度条件下预测管道内料浆屈服应力和塑性黏度。
To investigate the effect of initial slurry temperature variation on the rheological parameters of ultra-fine tailings backfill slurry and the characteristics of slurry temperature distribution in the pipeline,the rheological test of ultra-fine tailings backfill slurry was carried out,the slurry flow heat transfer simulation test was conducted,and the prediction model of rheological parameters and the calculation model of pipeline transport temperature distribution were derived.The results show that the slurry temperature and yield stress and plastic viscosity of the ultra-fine tailings backfill slurry follow the Exponential Decay 2 fitting model.The pipe diameter and the slurry temperature inside the pipe under different initial slurry temperatures are in accordance with the Asym2sig fitting model.The model parameters were analyzed by deep fitting with the pipe diameter,and the variables are unified by using the pipe diameter to represent the variation parameters in the fitting models.According to the theory of heat transfer,the ultra-fine tailings backfill slurry reaches dynamic equilibrium after heat transfer by frictional heat generation,hydration and exchange with the external environment.Based on the prediction model of rheological parameters and the model of temperature distribution in the pipe,the yield stress and plastic viscosity of the slurry in the pipe may be predicted under the conditions of known pipe diameter and initial slurry temperature.
作者
孙海宽
甘德清
张雅洁
薛振林
SUN Hai-kuan;GAN De-qing;ZHANG Ya-jie;XUE Zhen-lin(School of Mining Engineering,North China University of Science and Technology,Tangshan 063200,China;Mining Development and Safety Technology Key Laboratory of Hebei Province,North China University of Science and Technology,Tangshan 063200,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第4期1333-1348,共16页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51774137,52074124)。
关键词
超细尾砂料浆
流变参数预测
管道温度分布
流动传热特征
ultra-fine tailings backfill slurry
rheological parameter prediction
pipeline temperature distribution
flow heat transfer characteristics
