非线性电场中电选粉煤灰颗粒分离过程研究
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摘要
在粉煤灰摩擦电选脱炭中,针对颗粒因带电荷质比小导致分选效率不高的问题,提出了一种新的非线性电场结构;在建立非线性电场二维模型和数学模型的基础上,对带电粉煤灰颗粒的运动过程进行了数值模拟,深入研究了颗粒荷质比、入射速度、电场强度和极板最小间距等因素对粉煤灰颗粒分离行为的影响,探索了非线性电场用于74μm粉煤灰颗粒高效脱炭的可行性,获得了操作参数的合理范围,为实现粉煤灰电选高效脱炭提供了新思路。
For the fly ash decarburization through tribo electrostatic separation,a new nonlinear electric field structure is proposed to solve the problem of small charge-to-mass ratio of particle which lead to the low efficiency of separation.Through the setting up of two-dimensional and mathematical models of nonlinear electric field,the numerical simulation of the charged fly ash particles moving process is carried out. The effects of charge-to-mass ratio and incident velocity of particle,electric field strength and minimum plate spacing on the fly ash separation are studied deeply. The feasibility of nonlinear electric field used for efficient decarburization of 74 μm fly ash particles is explored, and a reasonable numeric range of operating parameters is obtained, which provides a new technical idea for efficient decarburization of fly ash.
For the fly ash decarburization through tribo electrostatic separation,a new nonlinear electric field structure is proposed to solve the problem of small charge-to-mass ratio of particle which lead to the low efficiency of separation.Through the setting up of two-dimensional and mathematical models of nonlinear electric field,the numerical simulation of the charged fly ash particles moving process is carried out. The effects of charge-to-mass ratio and incident velocity of particle,electric field strength and minimum plate spacing on the fly ash separation are studied deeply. The feasibility of nonlinear electric field used for efficient decarburization of 74 μm fly ash particles is explored, and a reasonable numeric range of operating parameters is obtained, which provides a new technical idea for efficient decarburization of fly ash.
引文
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[2] Li Haisheng,Chen Yinghua,Wu Kaibo,et al.Particle collision during the tribo-electrostatic beneficiation of fly ash based on infrared thermography[J].Journal of the Southern African Institute of Mining and Metallurgy,2013,113(12):899-904.
[3] 姜立萍,黄磊.粉煤灰的综合利用现状及发展趋势[J].煤化工,2015,43(2):64-68.
[4] Li Haisheng,Chen Yinghua,Zhao Yuemin,et al.The Effect of the Cross-Sectional Shape of Friction Rods on the Triboelectrostatic Beneficiation of Fly Ash[J].International Journal of Coal Preparation and Utilization,2015,35(3):113-124.
[5] 张丽.粉煤灰资源化综合利用的现状分析[J].能源与节能,2015(9):114-116.
[6] 李海生,章新喜,陈英华.摩擦电选中摩擦器内颗粒的碰撞特性[J].中国矿业大学学报,2012,41(4):607-612.
[7] 于凤芹,章新喜,段代勇,等.粉煤灰摩擦电选脱炭的试验研究[J].选煤技术.2008 (1):8-11.
[8] 李海生.循环流化床锅炉粉煤灰摩擦电选脱炭的研究[D].徐州:中国矿业大学,2012.
[9] 于慧敏,戴惠新,陈晓鸣,等.国外摩擦电选的研究与发展[J].矿产保护与利用,2015(4):67-72.
[10] Vinay S J,Jhon M S.Particle swami dynamics in triboelectric systems[J].Journal of Applied Physics.2001,89(2):1436-1440.
[11] Calin L,Mihalcioiu A,Das S,et al.Controlling particle trajectory in free-fall electrostatic separators[J].IEEE Transactions on Industry Applications.2008,44(4):1038-1044.
[12] 薛群虎,杨源,袁广亮,等.粉煤灰理化性能研究[J].煤炭科学技术,2007(11):91-94.
[13] Sameer Mhatre,Rochish Thaokar.Electrocoalescence in non-uniform electric fields:An experimental study[J].Chemical Engineering and Processing,2015(96):28-38.
[14] Nenu RKT,Lzumi S,Yoshida H,et al.Separation of Unburned Carbon in Fly Ash Particles Using Special Louver Separator[J].Journal of Chemical Engineering of Japan.2011,44(3):146-154.
[15] 陶有俊,张杰,王旭,等.旋转摩擦电选及其对粉煤灰脱炭研究[J].中国矿业大学学报,2014,43(4):672-677.