液固流化床中倾斜板弱化粒度影响研究
发布时间：2018-08-24 19:51
【摘要】：针对传统重选中颗粒粒度降低物料密度分选效果、限制设备处理能力等问题,结合流化床流化作用和斜板沉降作用,利用在流化床上添加倾斜板组来研究物料的分离分选。倾斜通道中流体速度分布特点和剪切提升作用为弱化颗粒粒度影响、强化颗粒密度分选提供了条件。论文主要运用运动学、动力学来分析倾斜通道中固体颗粒运动,分别建立颗粒粒度对颗粒运动影响关系式、颗粒受到的水速与颗粒粒度关系方程以及颗粒平衡位置与颗粒性质的关系方程。借助于模型颗粒的试验研究,从而对所建关系进行验证与修正。论文以单一沉降特性颗粒运动模型为基础,推导出通道内密度与粒度对多颗粒分离的影响关系:Lpd =k△ρ2.45/d1.14。分别研究玻璃珠颗粒(0.2-0.4mm、0.4-0.6mm)和磁铁矿粉颗粒(0.2-0.3mm)在不同水速与板间距下的运动轨迹,试验结果表明6mm板间距通道内颗粒的运动轨迹发生明显变化且物料分离过程中颗粒粒度影响作用弱化。通过对层流条件下倾斜通道中颗粒的速度平衡和受力平衡分析,推导出水速与颗粒特性间关系式:U'=0.0479d0.14(ρp-ρf)-0.71g0.71z/ρ0.29fμ0.43,以及颗粒远离板面时速度平衡位置x1与受力平衡位置(?)并提出表征物料分离能力η。分使用0.09m/s和0.15m/s的水速可将0.2-0.8mm玻璃珠和0.125-0.3mm磁铁矿粉选出,进一步验证了倾斜通道弱化粒度影响的研究结果。并采用干扰沉降理论解释了小于0.5mm玻璃珠的分选效果。因而,利用平衡关系可预测出不同水速物料的有效分选粒度范围和预测给定粒度物料所需分选水速。运用平衡关系方程预测6mm板间距下0.25-2mm煤泥分选水速为0.065m/s。依次采用 0.0315m/s,0.0473m/s,0.0699m/s 以及 0.0896m/s 的上升水速回收 2kg煤泥颗粒,比较煤泥分选试验与浮沉试验,确定使用0.07m/s的水速分选煤泥颗粒,将25.68%的原煤灰分降到12%左右,精煤产率为65%。
[Abstract]:Aiming at the problems of reducing the separation effect of material density and limiting the treatment ability of equipment by traditional re-selecting particle size, the separation and separation of materials was studied by adding tilting plate group to the fluidized bed in combination with fluidized bed fluidization and inclined plate settlement. The characteristics of fluid velocity distribution and shear lifting in inclined channels provide conditions for weakening particle size and enhancing particle density separation. In this paper, kinematics and dynamics are used to analyze the motion of solid particles in inclined channels, and the relationship between particle size and particle motion is established. The relation equation between water velocity and particle size and the relationship between particle equilibrium position and particle properties are obtained. By means of the experimental study of the model particles, the relationship is verified and corrected. Based on the model of single settling particle motion, the relationship between particle size and density in channel on multi-particle separation is deduced. The relation between particle size and particle size is: LPD / k 蟻 2.45 / d 1.14. The motion trajectories of glass beads (0.2-0.4mm) and magnetite particles (0.2-0.3mm) at different water velocities and plate spacing were studied. The experimental results show that the movement trajectory of particles in the gap channel of 6mm plate is obviously changed and the effect of particle size is weakened in the process of material separation. Based on the analysis of velocity balance and force balance of particles in inclined channel under laminar flow condition, the relationship between water velocity and particle characteristics is derived. The relationship between water velocity and particle characteristics is derived from the formula: 0. 0479d0.14 (蟻 p- 蟻 f) -0.71g0.71z/ 蟻 0.29f 渭 0.43, and the velocity equilibrium position x1 and the force balance position when particles are far away from the plate surface (?) The material separation ability 畏. The 0.2-0.8mm glass beads and the 0.125-0.3mm magnetite powders can be selected by using 0.09m/s and 0.15m/s separately, which further verifies the results of the study on the effect of the slanting channel on the weakening particle size. The separation effect of glass beads less than 0.5mm is explained by the theory of interference settlement. Therefore, the effective separation granularity range of different water speed materials and the separation speed required for given size materials can be predicted by using the equilibrium relation. The equilibrium equation is used to predict the separation water velocity of 0.25-2mm slime at 6mm plate spacing of 0.065 m / s. 0.0315 m / s / s 0.0473m / s 0.0699m / s and 0.0896m/s 's rising water speed were used to recover 2kg slime particles respectively. Comparing slime separation test with floatation test, it was determined that using 0.07m/s to separate slime particles at water speed, the ash content of raw coal was reduced to about 12%, and the yield of refined coal was 65%.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD94;TD45
本文编号：2201853
[Abstract]:Aiming at the problems of reducing the separation effect of material density and limiting the treatment ability of equipment by traditional re-selecting particle size, the separation and separation of materials was studied by adding tilting plate group to the fluidized bed in combination with fluidized bed fluidization and inclined plate settlement. The characteristics of fluid velocity distribution and shear lifting in inclined channels provide conditions for weakening particle size and enhancing particle density separation. In this paper, kinematics and dynamics are used to analyze the motion of solid particles in inclined channels, and the relationship between particle size and particle motion is established. The relation equation between water velocity and particle size and the relationship between particle equilibrium position and particle properties are obtained. By means of the experimental study of the model particles, the relationship is verified and corrected. Based on the model of single settling particle motion, the relationship between particle size and density in channel on multi-particle separation is deduced. The relation between particle size and particle size is: LPD / k 蟻 2.45 / d 1.14. The motion trajectories of glass beads (0.2-0.4mm) and magnetite particles (0.2-0.3mm) at different water velocities and plate spacing were studied. The experimental results show that the movement trajectory of particles in the gap channel of 6mm plate is obviously changed and the effect of particle size is weakened in the process of material separation. Based on the analysis of velocity balance and force balance of particles in inclined channel under laminar flow condition, the relationship between water velocity and particle characteristics is derived. The relationship between water velocity and particle characteristics is derived from the formula: 0. 0479d0.14 (蟻 p- 蟻 f) -0.71g0.71z/ 蟻 0.29f 渭 0.43, and the velocity equilibrium position x1 and the force balance position when particles are far away from the plate surface (?) The material separation ability 畏. The 0.2-0.8mm glass beads and the 0.125-0.3mm magnetite powders can be selected by using 0.09m/s and 0.15m/s separately, which further verifies the results of the study on the effect of the slanting channel on the weakening particle size. The separation effect of glass beads less than 0.5mm is explained by the theory of interference settlement. Therefore, the effective separation granularity range of different water speed materials and the separation speed required for given size materials can be predicted by using the equilibrium relation. The equilibrium equation is used to predict the separation water velocity of 0.25-2mm slime at 6mm plate spacing of 0.065 m / s. 0.0315 m / s / s 0.0473m / s 0.0699m / s and 0.0896m/s 's rising water speed were used to recover 2kg slime particles respectively. Comparing slime separation test with floatation test, it was determined that using 0.07m/s to separate slime particles at water speed, the ash content of raw coal was reduced to about 12%, and the yield of refined coal was 65%.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD94;TD45
【参考文献】
相关期刊论文 前10条
1 贺长营;李延锋;张文军;赵闻达;;三产品液固流化床对难选粗煤泥逐步分离过程研究[J];煤炭科学技术;2015年07期
2 贾木欣;应平;付强;;从工艺矿物学角度探讨某些难处理资源开发利用中的问题[J];有色金属(选矿部分);2015年02期
3 贺长营;李延锋;张文军;赵明辉;李东泽;张迟强;;加重质液固流化床流化特性研究[J];煤炭技术;2015年03期
4 周盈盈;;RC粗煤泥分选机的研究与应用[J];煤炭加工与综合利用;2013年06期
5 赵岳;龚斌;吴剑华;;基于液滴分离时间的斜板沉降器结构参数优化[J];当代化工;2013年04期
6 白荣林;;我国矿物加工工程技术发展和研究新领域[J];云南冶金;2012年05期
7 冯思静;马云东;刘辉;潘日芳;;煤炭资源型城市大气环境污染损失核算研究[J];安全与环境学报;2012年05期
8 张国防;闻国旗;;几种粗煤泥处理设备的分析对比[J];科技资讯;2012年11期
9 陈文刊;李延锋;徐世辉;李明勇;种亚岗;;液固流化床分选粗煤泥技术发展与应用[J];矿山机械;2011年09期
10 陈文刊;李延锋;徐世辉;訾涛;李明勇;谢彦君;;液固流化床粗煤泥分选机与螺旋分选机的对比[J];选煤技术;2011年04期
相关博士学位论文 前2条
1 李延锋;液固流化床粗煤泥分选机理与应用研究[D];中国矿业大学;2008年
2 王喜良;斜窄流沉降分离过程研究与设备研制[D];昆明理工大学;2003年
相关硕士学位论文 前2条
1 贺长营;液固流化床中倾斜板的作用机理研究[D];中国矿业大学;2016年
2 和彦杰;斜板沉降器固液两相流数值模拟及分离性能研究[D];四川大学;2001年
，本文编号：2201853
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2201853.html
