粗颗粒煤浆管道输送级配降级及其影响研究  

Study on grading degradation of coarse coal slurry pipeline transportation and its influence

作　　者：赵利安[1] 王铁力 ZHAO Li’an;WANG Tieli(College of Mining,Liaoning Technical University,Fuxin 123000,China;Pipeline Engineering Institute,Wuhan Design and Research Institute of China Coal Technology and Engineering Group,Wuhan 430064,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]中煤科工集团武汉设计研究院有限公司管道工程院,湖北武汉430064

出　　处：《水利水运工程学报》2022年第3期115-121,共7页Hydro-Science and Engineering

基　　金：辽宁省教育厅科学研究经费资助项目(20-1054)。

摘　　要：针对粗颗粒煤浆输送中颗粒级配降级预测研究不足的问题,采用试验研究和理论分析法,给出了输送30、40、50和60 min时煤浆中各颗粒粒级的质量百分数、黏度和水力坡度值,提出用磨矿理论研究粗颗粒煤浆管道输煤过程的构想,据此给出了破碎率函数和磨矿平衡方程的求解方法。研究表明,煤浆输送30和50 min时颗粒级配的预测值与实测值最大偏差不大于12.53%。随着粗煤浆体输送时间的延长,煤浆相对黏度逐渐增大,主要原因是由于2.0 mm以上粗颗粒的颗粒细化,增加了0.074 mm以下的细颗粒含量。颗粒级配降级导致水力坡度降低主要是由于粗颗粒细化导致沉降速度降低及与管道底部接触的粗颗粒有所减少的原因。In view of the lack of research on the prediction of particle gradation degradation in the transportation of coarse particle coal slurry,by using the experimental research method and theoretical analysis method,the mass percentage,viscosity and hydraulic gradient of each particle size in coal slurry at 30,40,50 and 60 min are given out.The idea of using grinding theory to study the coal conveying process of coarse coal slurry pipeline is put forward.On this basis,the solution methods of breakage rate function and grinding balance equation are given.The results of data comparison and analysis show that the maximum deviation between the predicted value and the measured value of particle gradation is no more than 12.53%when the coal slurry is transported for 30 and 50 min.With the extension of conveying time of coarse coal slurry,the relative viscosity of coal slurry gradually increases,mainly due to the refinement of coarse particles above 2.0 mm and the increase of particle content below 0.074 mm.The reduction of hydraulic gradient caused by particle grading degradation is mainly due to the reduction of settlement velocity caused by coarse particle refinement and the reduction of the probability of particle contact with the bottom of the pipeline.

关 键 词：级配降级 粗颗粒 黏度 水力坡度 破碎率函数 

分 类 号：TD825.6[矿业工程—煤矿开采]