自摆动喷枪喷吹石灰石粉脱磷的水模拟
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摘要
为了探究自摆动喷枪喷吹石灰石脱磷的可行性,建立了自摆动喷枪喷吹石灰石粉脱磷的冷态模型,用水模拟铁水,PMMA粉模拟石灰石粉,真空泵油模拟炉渣,压缩空气模拟氧气,研究了喷头马赫数、喷孔夹角、枪位、供料速度和石灰石粉粒度对熔池内传输动力学条件的影响。结果表明,拉瓦尔喷头可以用于石灰石粉喷吹,但是马赫数不宜太大,最佳马赫数为1.8;熔池内传输的动力学条件随喷孔夹角的增大逐渐改善,但喷孔夹角过大会导致穿透比急剧减小和喷溅程度急剧恶化,最佳喷孔夹角为25°;试验喷枪最佳操作参数为,枪位200 mm,供料速度1.8 kg/min,石灰石粉粒度0.164 mm。
In order to explore the feasibility of dephosphorization by the free swing lance injecting limestone powder,a cold model of the free swing lance injecting limestone powder to dephosphorization system was established to investigate the effect of the Mach number of nozzle,the nozzle's angle,the lance height,the feeding speed and the particle size of injection system on the transmission dynamics condition in the melt bath. The water,the polymethylmethacry late particle,the vacuum-pump oil and the compressed air were used to simulate the hot metal,the limestone powder,the slag and the oxygen respectively. The results showed that the Laval nozzle could be used to inject limestone powder,but the Mach number of the nozzle should not be too large. The optimal Mach number was 1.8. The transmission dynamics condition in the melt bath became better with the increasing of the nozzle's angle,but the particle penetration ratio would increase and the splash would decrease sharply if the nozzle's angle was too large. The optimum parameters of the nozzle's angle,the lance height,the feeding speed and the particle size were 25°,200 mm,1.8 kg/min and 0.164 mm respectively.
In order to explore the feasibility of dephosphorization by the free swing lance injecting limestone powder,a cold model of the free swing lance injecting limestone powder to dephosphorization system was established to investigate the effect of the Mach number of nozzle,the nozzle's angle,the lance height,the feeding speed and the particle size of injection system on the transmission dynamics condition in the melt bath. The water,the polymethylmethacry late particle,the vacuum-pump oil and the compressed air were used to simulate the hot metal,the limestone powder,the slag and the oxygen respectively. The results showed that the Laval nozzle could be used to inject limestone powder,but the Mach number of the nozzle should not be too large. The optimal Mach number was 1.8. The transmission dynamics condition in the melt bath became better with the increasing of the nozzle's angle,but the particle penetration ratio would increase and the splash would decrease sharply if the nozzle's angle was too large. The optimum parameters of the nozzle's angle,the lance height,the feeding speed and the particle size were 25°,200 mm,1.8 kg/min and 0.164 mm respectively.
引文
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[14]Shinya Fukagai,Tasuku Hamano,Fumitaka Tsukihashi.Formation reaction of phosphate compound in multi phase flux at 1 573 K[J].ISIJ International,2007,47(1):187.
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[2]叶玉奎,王向红,秦福同,等.复吹转炉双渣脱磷工艺实践[J].中国冶金,2018,28(1):40.(YE Yu-kui,WANG Xiang-hong,QIN Fu-tong,et al.Practice of double-slag dephosphorization technology for combined blown converter[J].China Metallurgy,2018,28(1):40.)
[3]范振林.中国铁矿资源保障程度研究[J].矿业研究与开发,2013,33(6):124.(FAN Zhen-lin.Research on the indemnificatory of iron ore resources in China[J].Mining Research and Development,2013,33(6):124.)
[4]李厚民,王登红,李立兴,等.中国铁矿成矿规律及重点矿集区资源潜力分析[J].中国地质,2012,39(3):559.(LI Houmin,WANG Deng-hong,LI Li-xing,et al.Metallogeny of iron deposits and resource potential of major iron minerogenetic units in China[J].Ceology in China,2012,39(3):559.)
[5]董文亮,罗磊,田志红,等.“全三脱”工艺流程中脱碳渣返回脱磷转炉利用[J].钢铁,2017,52(5):36.(DONG Wen-liang,LUO Lei,TIAN Zhi-hong,et al.Recycle of decarburizationslag in dephosphorization-furnace of duplex process in converter[J].Iron and Steel,2017,52(5):36.
[6]吴伟,戴诗凡.石灰石对转炉冶炼效果的影响[J].中国冶金,2016,26(5):52.(WU Wei,DAI Shi-fan.Influence of limestone on metallurgical effect of converter[J].China Metallurgy,2016,26(5):52.)
[7]韩跃新,孙永升,高鹏,等.高磷鲕状赤铁矿开发利用现状及发展趋势[J].金属矿山,2012,41(3):1.(HAN Yue-xin,SUNYong-sheng,GAO Peng,et al.Exploitation situation and development trend of high phosphorus oolitic hematite[J].Metal Mine,2012,41(3):1.)
[8]杨文远,李林,彭小艳,等.转炉铁水脱磷预处理水模试验[J].钢铁,2015,50(9):34.(YANG Wen-yuan,LI Lin,PENG Xiaoyan,et al.Water model experimental of dephosphorization pretreatment in converter[J].Iron and Steel,2015,50(9):34.)
[9]周进东,毕学工,吴杰,等.高磷铁水预脱磷合理工艺的实验研究[J].过程工程学报,2011,11(1):50.(ZHOU Dong-jin,BIXue-gong,WU Jie,et al.Experimental study on rational technology of dephosphorization pretreatment for high phosphorus content hot iron[J].The Chinese Journal of Process Engineering,2011,11(1):50.)
[10]Miyata M,Tamura T,Higuchi Y.Development of hot metal dephosphorization with limestone powder top blowing:Part 1.low blowing rate[J].ISIJ International,2017,57(10):1751.
[11]唐彪,王晓鸣,邹宗树,等.复吹转炉氧枪喷吹石灰石石颗粒的物理模拟[J].东北大学学报:自然科学版,2014,35(5):695.(TANG Biao,WANG Xiao-ming,ZOU Zong-shu,et al.Physical simulation of BOF limestone particles blowing via top lance[J].Journal of Northeastern University:Natural Science,2014,35(5):695.)
[12]Masakatsu Hasegawa,Masanori Iwase.Thermodynamics of CaO-based slags for hot metal pretreatment[C]//Proceedings of the Second Baosteel Biennial Academic Conference.Shanghai:Metallurgical Industry Press,2006:210.
[13]Tasuku Hamano,Shinya Fukagai,Fumitaka tsukihashi reaction mechanism between solid CaO and FeOx-CaO-SiO2-P2O5slag at1 573 K[J].ISIJ International,2006,46(4):490.
[14]Shinya Fukagai,Tasuku Hamano,Fumitaka Tsukihashi.Formation reaction of phosphate compound in multi phase flux at 1 573 K[J].ISIJ International,2007,47(1):187.
[15]范全荣.动态自由喷枪铁水预处理脱硫[C]//2010年全国炼钢-连铸生产技术会议.北京:中国金属学会,2010:116.(FANQuan-rong.Dynamic free lance for desulphurization of molten iron[C]//National Conference on Steelmaking and Continuous Casting Technology.Beijing:The Chinese Society for Metals,2010:116.)