基于湍流动能控制的煤粉摩擦荷电过程强化模拟研究  

Study on Enhanced Simulation of Frictional Charging Process of Pulverized Coal Based on Turbulent Kinetic Energy Control

作　　者：杨勇[1,2] 邓雨生 郑文凯[1] 卢晓斌[1] 张峰彬 张真兴 王海锋 YANG Yong;DENG Yusheng;ZHENG Wenkai;LU Xiaobin;ZHANG Fengbin;ZHANG Zhenxing;WANG Haifeng(SINOPEC Maoming Petrochemical Co.,Ltd.,525000,China;Guangdong Provincial Key Laboratory of Advanced Green Lubricating Materials,Maoming 525000,China;School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国石化集团茂名石油化工有限公司,广东茂名525000 [2]广东省先进绿色润滑材料企业重点实验室,广东茂名525000 [3]中国矿业大学化工学院,江苏徐州221116

出　　处：《煤炭技术》2024年第12期198-202,共5页Coal Technology

基　　金：江苏省科技计划专项基金(BE2022717);国家自然科学基金面上项目(51674257);茂名石化技术开发项目(MMBZ220004)。

摘　　要：摩擦电选在煤粉净化、粉煤灰脱炭等方面具有较强的技术优势和良好的应用前景。煤和矿物颗粒在摩擦器中充分摩擦异性荷电是实现高效摩擦电选的关键。利用计算流体力学对摩擦器内部流场进行数值模拟,以湍流动能为指标分析颗粒摩擦荷电效果,湍流脉动强度越大,颗粒摩擦荷电效果越好,分析了阻尼块间距、阻尼块角度和阻尼块高度对摩擦器内部体积平均湍流动能的影响规律。研究表明,摩擦器内湍流动能与阻尼块间距呈负相关,满足幂函数关系k=95.08l^(-0.56)。摩擦器内湍流动能随着阻尼块尺寸的增加呈先增加后稳定的趋势,而阻尼块角度对湍流动能的影响呈二次曲线关系。因此,摩擦器的结构设计时应适当减小阻尼块间距,增大阻尼块角度,适当增加阻尼块高度。Triboelectric separation has strong technical advantages and good application prospects in the fields of pulverized coal purification and coal ash decarbonization.The full tribological charge of coal and mineral particles in the tribocharger is the key to achieve high efficiency triboelectric separation.Computational fluid dynamics is used to numerically simulate the flow field inside the tribocharger,and turbulence pulsation intensity is used as the index to analyze the frictional charging effect of particles.The greater the turbulence pulsation intensity,the better the frictional charging effect of particles.The law of the influence of damping block spacing,damping block angle and damping block height on the mean turbulent kinetic energy of the internal volume of the tribocharger is analyzed.The study found that the turbulent kinetic energy in the friction device is negatively correlated with the distance between the damping blocks,which satisfies the power function relationship k=95.08l^(-0.56).The turbulent kinetic energy in the friction device first increased and then stabilized with an increase in the size of the damping block,and the influence of the angle of the damping block on the turbulent kinetic energy was a quadratic curve.In summary,the structural design of a tribocharging device should appropriately reduce the distance between the damping blocks,increase the angle of the damping blocks,properly increase the height of the damping blocks.

关 键 词：摩擦器 湍流动能 湍流涡 过程强化 

分 类 号：TD924[矿业工程—选矿]