新型液固流化床粗煤泥分选与数值模拟
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摘要
试验研究了一种变径和内置倾斜板的新型液固流化床的粗煤泥分选特性.与传统液固流化床相比,新型液固流化床强化了颗粒按密度分离.当要求精煤灰分为8.00%时,精煤产率相比传统液固流化床超出4个百分点,可能偏差(E_p)值降低约80 mg/cm~3.对新型分选机内部流场和颗粒受力进行了数值模拟,分析了新型液固流化床的强化分选机制.分选机直筒段和变径段流态为紊流,倾斜板间流态呈层流;颗粒在倾斜板间受垂直板面方向的升力作用,越靠近板面升力越大;变径段和倾斜板共同强化了颗粒分层,是新型液固流化床分选效果提高的根本原因.
For a new liquid-solid fluidized bed with variable diameter and built-in inclined plates, the separating characteristics of the coarse slime were experimentally studied. Compared with the conventional liquid-solid fluidized bed, the new sorter enhanced separating effect of particles by density. When the clean coal ash was required to be 8.00%, the clean coal yield exceeded 4 percent, and the E_p value reduced by about 80 mg/cm~3. Moreover, the flow field and particle force in new sorter were simulated, and the mechanism of reinforcing density-dominant separation was analyzed. The results show that flow regime in straight and variable section is turbulent, while between two inclined plates is laminar. The particles are subjected to the lift force in a direction perpendicular to the inclined plates. The closer to the plate surface, the greater the lift force. The variable diameter section and inclined plates together strengthen the particle stratification, which is the fundamental reason for the improvement of the separating effect of the new liquid-solid fluidized bed.
For a new liquid-solid fluidized bed with variable diameter and built-in inclined plates, the separating characteristics of the coarse slime were experimentally studied. Compared with the conventional liquid-solid fluidized bed, the new sorter enhanced separating effect of particles by density. When the clean coal ash was required to be 8.00%, the clean coal yield exceeded 4 percent, and the E_p value reduced by about 80 mg/cm~3. Moreover, the flow field and particle force in new sorter were simulated, and the mechanism of reinforcing density-dominant separation was analyzed. The results show that flow regime in straight and variable section is turbulent, while between two inclined plates is laminar. The particles are subjected to the lift force in a direction perpendicular to the inclined plates. The closer to the plate surface, the greater the lift force. The variable diameter section and inclined plates together strengthen the particle stratification, which is the fundamental reason for the improvement of the separating effect of the new liquid-solid fluidized bed.
引文
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[2] SARKAR B,DAS A,MEHROTRA S P.Study of separation features in floatex density separator for cleaning fine coal[J].International Journal of Mineral Processing,2008,86(1):40-49.
[3] SARKAR B,DAS A,ROY S,et al.In depth analysis of alumina removal from iron ore fines using teetered bed gravity separator[J].Mineral Processing & Extractive Metallurgy,2013,117(1):48-55.
[4] 焦红光,惠兵,冯金涛,等.新型粗煤泥干扰床分选技术的研究[J].煤炭工程,2009(2):85-87.JIAO Hongguang,HUI Bing,FENG Jintao,et al.Research on new teeter bed separation technology of coarse slime[J].Coal Engineering,2009(2):85-87.
[5] 唐利刚,朱庆山,段晨龙,等.干扰流化床中细粒煤散式流化特性数值模拟研究[J].中国矿业大学学报,2012,41(1):86-90.TANG Ligang,ZHU Qingshan,,DUAN Chenlong,et al.Simulation study of particulate fluidization characteristics of fine coals in hindered fluidized bed[J].Journal of China University of Mining and Technology,2012,41(1):86-90.
[6] 张岭.三产品干扰床分选机结构设计及分选试验研究[D].焦作:河南理工大学,2015:1-23.ZHANG Ling.Three-products teetered bed separator structure design and separation experimental study[D].Jiaozuo:Henan Polytechnic University,2015:1-23.
[7] 王克兵,李延锋,张旭波,等.三产品液固流化床结构设计及试验研究[J].煤炭工程,2014,46(11):115-118.WANG Kebing,LI Yanfeng,ZHANG Xubo,et al.Design and experiment study on three-product liquid-solid fluidized bed[J].Coal Engineering,2014,46(11):115-118.
[8] GALVIN K P,DOROODCHI E,CALLEN A M,et al.Pilot plant trial of the reflux classifier[J].Minerals Engineering,2002,15(1):19-25.
[9] KOHMUENCH J N,MANKOSA M J,HONAKER R Q,et al.Applications of the crossflow teeter-bed separator in the US coal industry[J].Minerals and Metallurgical Processing,2006,23(4):187-195.
[10] KUMAR C R,BHOJA S K,TRIPATHY S K,et al.Classification performance evaluation of floatex density separator for coal fines[J].Fuel,2013,108(11):303-310.
[11] 孙铭阳.液固分选流化床数学模型与结构优化研究[D].北京:中国矿业大学(北京),2017:6-18.SUN Mingyang.Mathematical modeling and structure optimizing of liquid-solid fluidized bed separator[D].Beijing:China University of Mining and Technology (Beijing),2017:6-18.
[12] 李阳.新型液固流化床分选特性研究[D].北京:中国矿业大学(北京),2017:14-33.LI Yang.Study on the separation characteristics of a novel liquid-solid fluidized bed separator[D].Beijing:China University of Mining and Technology (Beijing),2017:14-33.
[13] XIA Y K.CFD simulation of fine particle gravity separation in hindered-settling bed separators[J].Chemical Product and Process Modeling,2007,2(3):5-13.
[14] 陈友良,刘文礼,马克富,等.粗煤泥干扰床分选机流场的数值模拟[J].中国矿业大学学报,2011,40(4):608-611.CHEN Youliang,LIU Wenli,MA Kefu,et al.Numerical simulation of the flow field in the teetered bed separator[J].Journal of China University of Mining and Technology,2011,40(4):608-611.
[15] 韦鲁滨,孙铭阳,孟丽诚,等.基于CFD的液固分选流化床数值模拟[J].煤炭学报,2016,41(7):1820-1826.WEI Lubin,SUN Mingyang,MENG Licheng,et al.Numerical studies of liquid-solid fluidized bed separator using CFD[J].Journal of China Coal Society,2016,41(7):1820-1826.
[16] 沙杰.液固流化床中颗粒分选行为和运动特性的研究[D].徐州:中国矿业大学,2013:21-43.SHA Jie.Study on separation behavior and motion characteristic of particles in liquid-solid fluidized bed separator[D].Xuzhou:China University of Mining and Technology,2013:21-43.
[17] 韦鲁滨.双密度层流化床形成机理[J].中南工业大学学报,1998(4):330-333.WEI Lubin.Study on the formation mechanism of double-density fluidized beds[J].Journal of Central South University of Technology,1998(4):330-333.