流体转杯离心粒化特性试验
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摘要
针对高温熔融高炉渣转杯粒化技术,为了探索离心粒化过程中熔渣颗粒形成的机理及熔渣体流量、转杯转动速度等参数对颗粒粒径的影响,以水为粒化试验工质,以直径110 mm的转杯为离心粒化器,开展了离心粒化可视化试验。研究了工质在转杯表面的流动和在转杯边缘形成液丝、液丝断裂成液滴的机理,以及液丝长度、顶端液滴粒径随时间的变化趋势;基于图像处理技术分析了转杯转速、工质流量对粒化液滴的粒径分布和平均粒径的影响规律。结果表明:转杯表面液膜在转杯边缘形成若干凸起,并沿转杯运动的切线方向延伸形成液丝,液丝长度随时间呈线性变化关系,液丝顶端液滴粒径基本保持不变;随着工质流量降低和转杯转速升高,液滴平均粒径呈减小趋势,液滴速度接近转杯圆周速度。
Based on the granulation technology for high temperature molten blast furnace slag by rotary cup, visualization experiments were conducted by applying water as the substitute for slag and a rotary cup with diameter of 110 mm to investigate the flow mechanism on the rotary cup surface and the formation of liquid ligament at the edge of the rotary cup. The dynamic behaviors of the liquid ligament length and the diameter of ligament head were obtained. The effects of rotary speed, liquid flow rate on diameter distribution of the granulated droplets were discussed. The experimental results indicate that the liquid film on the cup surface formed some heaves along the edge of the cup and formed liquid ligaments along the tangential direction of the rotary cup movement; the ligament length almost linearly increased as time progressed, while the diameter of ligament head approximately kept a constant value. The average diameter of the granulated droplets decreased with the increase of rotary speed and the decrease of the liquid flow rate.
Based on the granulation technology for high temperature molten blast furnace slag by rotary cup, visualization experiments were conducted by applying water as the substitute for slag and a rotary cup with diameter of 110 mm to investigate the flow mechanism on the rotary cup surface and the formation of liquid ligament at the edge of the rotary cup. The dynamic behaviors of the liquid ligament length and the diameter of ligament head were obtained. The effects of rotary speed, liquid flow rate on diameter distribution of the granulated droplets were discussed. The experimental results indicate that the liquid film on the cup surface formed some heaves along the edge of the cup and formed liquid ligaments along the tangential direction of the rotary cup movement; the ligament length almost linearly increased as time progressed, while the diameter of ligament head approximately kept a constant value. The average diameter of the granulated droplets decreased with the increase of rotary speed and the decrease of the liquid flow rate.
引文
[1]ZHANG H,WANG H,ZHU X,et al.A Review of Waste Heat Recovery Technologies Towards Molten Slag in Steel Industry[J].Appl Energy,2013,112:956.
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[10]Teunou E,Poncelet D.Rotary Disc Atomisation for Microencapsulation Applications-Prediction of the Particle Trajectories[J].Journal of Food Engineering,2005,71:345.
[2]曲余玲,毛艳丽,张东丽,等.国内外转杯法高炉渣粒化工艺研究进展[J].冶金能源,2011,30(4):19.
[3]LIU J X,YU Q B,LI P,et al.Cold Experiments on Ligament Formation for Blast Furnace Slag Granulation[J].Applied Thermal Engineering 2012,40:351.
[4]Mizuochi T,Akiyama T.Cold Experiments of Rotary VanedDisks and Wheels for Slag Atomization[J].ISIJ Int 2003,43:1469.
[5]XIE J W,ZHAO Y Y,Dunkley J J.Effects of Processing Conditions on Powder Particle Size and Morphology in Centrifugal Atomisation of Tin[J].Powder Metallurgy 2004,47:168.
[6]杨海威,郑炜,王志新,等.壁面环形延程槽对转盘雾化影响的研究[J].上海交通大学学报:农业科学版,2001,19(1);36.
[7]于庆波,刘军祥,胡贤忠,等.高炉渣破碎过程的模拟试验研究[J].钢铁,2009,44(4):82.
[8]LIU J,YU Q,GUO Q.Experimental Investigation of Liquid Disintegration by Rotary Cups[J].Chemical Engineering Science,2012,73:44.
[9]Kamiya T,Kayano A.Film-Type Disintegration by Rotating Disk[J].J Chem Eng Jpn,1972(5):174.
[10]Teunou E,Poncelet D.Rotary Disc Atomisation for Microencapsulation Applications-Prediction of the Particle Trajectories[J].Journal of Food Engineering,2005,71:345.