旋转摩擦电选起电器内粉煤灰颗粒运动特性的模拟研究
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摘要
为深入理解粉煤灰颗粒在旋转摩擦起电器内的运动特性,提高粉煤灰的荷电效果.采用标准k-ε湍流模型,结合颗粒轨道模型,分别以粒径为20,40和60μm的球形炭、灰颗粒为研究对象,对不同进气速率和摩擦轮转速下的颗粒运动进行数值仿真.模拟结果表明:颗粒在起电器内的运动行为和入口速率、摩擦轮转速、颗粒的粒径及种类均有关.在研究粒径范围内,颗粒粒径越大,平均速率越大,摩擦起电效果越好.粉煤灰颗粒的碰撞摩擦主要是与起电器外壳内壁面的碰撞摩擦以及颗粒和颗粒间的碰撞.入口速率和摩擦轮转速对颗粒的运动特性影响很大,最佳摩擦充电的条件为入口速率3 m/s,摩擦轮转速5 kr/min.颗粒在摩擦起电器右下方有堆积现象.该结论与文献中的实验结果基本一致,从而证明了本模拟结果的可靠性.
In order to understand motion characteristics of fly ash particles in the charging chamber of rotary triboelectrostatic separator and improve the charging effect of fly ash, the standard k-ε turbulence model and particle trajectory model were adopted to simulate the motion of spherical carbon and ash particles with particle sizes of 20, 40 and 60 μm at different air feed rates and friction wheel velocities. The simulation results show that the movement behavior of particles in the charger is related to the inlet flow rate, the speed of friction wheel, the particle size and type. In the particle size range studied, the larger the average particle size is, the better the effect of friction electrification is.It has also been shown that the collision friction of fly ash particles is mainly the collision friction with the inner wall of charger shell and the collision between particles.The inlet flow rate and the speed of friction wheel have great influence on the motion characteristics of fly ash. The optimum separation conditions are 3 m/s inlet flow rate and 5 kr/min friction wheel speed. It is found that many particles accumulated in the lower right part of the friction charger. These results are in good agreement with the experimental results in literature, which proves the reliability of the simulation results.
In order to understand motion characteristics of fly ash particles in the charging chamber of rotary triboelectrostatic separator and improve the charging effect of fly ash, the standard k-ε turbulence model and particle trajectory model were adopted to simulate the motion of spherical carbon and ash particles with particle sizes of 20, 40 and 60 μm at different air feed rates and friction wheel velocities. The simulation results show that the movement behavior of particles in the charger is related to the inlet flow rate, the speed of friction wheel, the particle size and type. In the particle size range studied, the larger the average particle size is, the better the effect of friction electrification is.It has also been shown that the collision friction of fly ash particles is mainly the collision friction with the inner wall of charger shell and the collision between particles.The inlet flow rate and the speed of friction wheel have great influence on the motion characteristics of fly ash. The optimum separation conditions are 3 m/s inlet flow rate and 5 kr/min friction wheel speed. It is found that many particles accumulated in the lower right part of the friction charger. These results are in good agreement with the experimental results in literature, which proves the reliability of the simulation results.
引文
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[18]邓明瑞,陶有俊,陶东平,等.旋转摩擦电选及其创新因素对粉煤灰脱炭效果研究[J].煤炭学报,2015,40(1):190-195.DENG Mingrui,TAO Youjun,TAO Dongping,et al.Rotary triboelectric separation and effect studies of its innovative factors on decarbonization of fly ash[J].Journal of China Coal Society,2015,40(1):190-195.
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[20]ZHANG Ling,TAO Youjun,LU Yang,et al.Research on flow field and kinematic characteristics of fly ash particles in rotary triboelectrostatic separator[J].Powder Technology,2018(336):168-179.
[21]TAO DANIEL,MOHAMMAD ALHWAITI.Beneficiation study of Eshidiyaphosphorites using a rotary triboelectrostatic separator[J].Mining Science and Technology(China),2010,20(3):357-364.
[2]TAO DANIEL,FAN Maoming,JIANG Xinkai.Dry coal fly ash cleaning using rotary triboelectrostatic separator[J].Mining Science and Technology,2009(19):0642-0647.
[3]陶有俊,朱向楠,陶东平,等.采用Design-Expert优化粉煤灰摩擦电选脱炭试验研究[J].煤炭学报,2016,41(2):475-482.TAO Youjun,ZHU Xiangnan,TAO Dongping,et al.Optimization of triboelectrostatic decarbonization experiment of fly ash by Design-Expert[J].Journal of China Coal Society,2016,41(2):475-482.
[4]朱广利,王浩宇,李海龙,等.粉煤灰脱炭研究进展及展望[J].洁净煤技术,2017,23(1):110-114.ZHU Guangli,WANG Haoyu,LI Hailong,et al.Methods of fly ash decarbonization[J].Clean Coal Technology,2017,23(1):110-114.
[5]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,2012:17-26.LI Haisheng.Study on triboelectrostatic separation unburned carbon from circulating fluidized bed boiler fly ash[D].Xuzhou:China University of Mining and Technology,2012:17-26.
[6]李海生,章新喜,陈英华,等.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.LI Haisheng,ZHANG Xinxi,CHEN Yinghua,et al.Collision characteristics of particles in the friction device of triboelectrostatic separator[J].Journal of China University of Mining and Technology,2012,41(4):607-612.
[7]李海生,章新喜,陈英华,等.粉煤灰电选脱炭摩擦器气固两相流场数值模拟[J].煤炭技术,2012,31(11):140-142.LI Haisheng,ZHANG Xinxi,CHEN Yinghua,et al.Numerical simulation on gas-solid two phase in friction device of decarbonization from fly ash by electrical separation[J].Coal Technology,2012,31(11):140-142.
[8]焦有宙,武卫政,孙育峰,等.干排粉煤灰摩擦高压静电脱炭技术试验研究[J].华北水利水电学院学报,2005,26(4):72-75.JIAO Youzhou,WU Weizheng,SUN Yufeng,et al.Experimental study on frictional high-voltage electrostatic de-carbon technology of dry discharge fly ash[J].Journal of North China Institute of Water Conservancy and Hydroelectric Power,2005,26(4):72-75.
[9]吴开波,李海生,章新喜,等.摩擦棒分布规律对粉煤灰电选脱炭的影响[J].煤炭学报,2014,33(7):243-245.WU Kaibo,LI Haisheng,ZHANG Xinxi,et al.Effect of friction rods distribution on fly ash triboelectrostatic beneficiation[J].Coal Technology,2014,33(7):243-245.
[10]BITTNER J D,GASIOROWSKI S A.STI's six years of commercial experiences in electrostatic beneficiation of fly ash[C]//2001International Ash Utilization Symposium.Lexington:IAUS,2001:43-57.
[11]汪澜,隋同波,王宏霞,等.粉煤灰带式输送静电分离方法及装置：中国,200610088885.0[P].2007-01-03.WANG Lan,SUI Tongbo,WANG Hongxia,et al.E-lectrostatic separation method and device for belt conveyance of flyash:China,200610088885.0[P].2007-01-03.
[12]CALIN L,IUGA A,SAMUILA A,et al.Factors that influence the fluidized-bed tribo-electrostatic separation of plastic granular IEEE mixtures[C]//Industry Applications Society Annual Meeting.Edmonton Alta,2008:0197-2618.
[13]陶东平.静电颗粒带电分选装置：中国,200420079562.1[P].2005-12-14.TAO Dongping.Electrostatic particle live sorting device:China,200420079562.1[P].2005-12-14.
[14]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.TAO Youjun,ZHANG Jie,WANG Xu,et al.Study of rotary triboelectrostatic separation and decarbonization of fly ash[J].Journal of China University of Mining and Technology,2014,43(4):672-677.
[15]张杰.粉煤灰旋转摩擦电选脱碳的试验研究[D].徐州：中国矿业大,2015:42-57.ZHANG Jie.Experimental study on fly ash cleaning using rotary triboelectrostatic separator[D].Xuzhou:China University of Mining and Technology,2015:42-57.
[16]TAO Youjun,ZHANG Ling,TAO Dongping,et al.Effects of key factors of rotary triboelectrostatic separator on efficiency of fly ash decarbonization[J].International Journal of Mining Science and Technology,2017(27):1037-1042.
[17]邓明瑞.旋转摩擦电选对电站粉煤灰高效脱碳试验研究[D].徐州：中国矿业大学,2012:73-84.DENG Mingrui.Experiment study on power station fly ash efficient cleaning using rotary triboelectrostatic separator[D].Xuzhou:China University of Mining and Technology,2012:73-84.
[18]邓明瑞,陶有俊,陶东平,等.旋转摩擦电选及其创新因素对粉煤灰脱炭效果研究[J].煤炭学报,2015,40(1):190-195.DENG Mingrui,TAO Youjun,TAO Dongping,et al.Rotary triboelectric separation and effect studies of its innovative factors on decarbonization of fly ash[J].Journal of China Coal Society,2015,40(1):190-195.
[19]TAO Youjun,DING Qingqing,DENG Mingrui,et al.Electrical properties of fly ash and its decarbonization by electrostatic separation[J].International Journal of Mining Science and Technology,2015,25(4):629-633.
[20]ZHANG Ling,TAO Youjun,LU Yang,et al.Research on flow field and kinematic characteristics of fly ash particles in rotary triboelectrostatic separator[J].Powder Technology,2018(336):168-179.
[21]TAO DANIEL,MOHAMMAD ALHWAITI.Beneficiation study of Eshidiyaphosphorites using a rotary triboelectrostatic separator[J].Mining Science and Technology(China),2010,20(3):357-364.
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