矿浆搅拌液固两相流固体颗粒运动影响因素研究  

Research on solid particle movement influencing factors of liquid-solid two-phase flow in pulp mixing

作　　者：吕晓仁[1] 郑聃 姜磊[2] 王世杰[1] 

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110870 [2]北方重工集团有限公司,辽宁沈阳110141

出　　处：《重型机械》2017年第4期34-38,共5页Heavy Machinery

基　　金：国家自然科学基金(50875178)

摘　　要：在矿浆搅拌过程中,临界离浮转速与叶轮离底间隙、粒径、砂粒密度、桨径、叶片倾角、矿浆固相浓度等诸多因素有关。本文选择了其中的叶轮离底间隙、叶片倾角、桨径、固相质量分数等为参数,分析这些参数对临界悬浮转速的影响,拟合临界悬浮转速与各个参数间的函数关系,为固-液搅拌设备的设计、性能优化提供依据。试验结果表明,较低的叶轮离底间隙、较大的叶片倾角、较低的固相质量分数和较大的桨径有利于固相的悬浮,对应的临界悬浮转速Njs较小。通过Matlab拟合得到了临界悬浮转速与各个参数之间的对应关系,关系式为N_(js)=211·D^(-1.400)·C^(0.208)·X^(0.278)·θ^(-0.426)。该试验结果对矿浆搅拌槽的工业应用具有实际的指导意义。In the pulp mixing process, the suspension speed is mainly related to impeller off-bottom clearance, pitch diameter, particle density, impeller diameter, blade angle, slurry solid concentration and other factors. In this paper, the impeller off-bottom clearance, blade angle, pitch diameter and particle mass fraction were se- lected as the main monitored parameters, the influence of these parameters on critical suspension speed was an- alyzed, and the function formula between the critical suspended speed and each parameter was fitted. This would provide the basis for the property optimization and design of solid-liquid mixing equipment. Results showed that the lower impeller clearance, larger blade angle, lower particle mass fraction and larger pitch diam- eter were beneficial to the suspension of the solid phase, and get smaller complete off-bottom critical suspension speed Njs. The formula could be listed as follow Njs=211·D^-1.400·C^0.208·X^0.278·θ^-0.426. The test results can be significant to industrial application of large slurry mixing tank.

关 键 词：矿浆搅拌 临界悬浮转速 固-液悬浮 影响因素 

分 类 号：TQ027.3[化学工程]