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以结晶器电磁搅拌器为研究对象,建立了Φ150 mm断面结晶器电磁搅拌过程的电磁场与流场耦合的三维数学模型,并采用有限元软件进行求解。分别模拟不同条件下的结晶器电磁搅拌电流和不同电磁搅拌频率作用下钢液在结晶器内流动状态的规律。研究结果表明:随搅拌电流的增大,钢液的切向流速增加,上部环流区缩短,下部旋转流动区域上移并扩大,搅拌电流和频率对钢液流动的影响相反;在电磁搅拌过程中,电磁搅拌使结晶器内钢液产生旋转流动阻止过热钢液下移,减弱冲击深度,使热区明显的上移。 相似文献
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在铸坯凝固末端安装末端电磁搅拌(F—EMS),通过对末端电磁搅拌器性能参数的检测判定和冶金效果的初步测试并进行生产试验,确定了末端电磁搅拌的电磁工艺参数与搅拌方式。配合结晶器电磁搅拌(M—EMS)进一步优化工艺,改善铸坯内部质量。 相似文献
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连铸结晶器电磁搅拌技术 总被引:1,自引:0,他引:1
闻述了连铸结晶器电磁搅拌的冶金功能、存在问题及相应地改进措施。在此基础上,提出了攀钢新建大方坯连铸机应采用结晶器 凝固末端电磁搅拌(M F—EMS)的复合型搅拌技术、开展结晶器电磁搅拌工艺参数优化研究的建议。 相似文献
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以某钢厂 500mm圆坯连铸结晶器为原型,建立了1∶1的物理模型,通过机械搅拌模拟结晶器电磁搅拌,分析研究了电磁搅拌对结晶器内钢液的流动、夹杂物去除率的影响。试验研究表明:电磁搅拌使结晶器内的钢液有一定的水平切向速度,使搅拌区钢水温度的分布更加均匀,有利于结晶器内保护渣的均匀熔化。电磁搅拌能够把水口冲击的轴向速度变为径向速度,从而大大降低流股的冲击深度,能有效地促进夹杂物的上浮和热区中心的上移。但并不是搅拌强度越大,夹杂物的去除率就越高,试验表明,在相同时间内,当搅拌强度为48r/min左右时,夹杂物的上浮率最高。 相似文献
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电磁搅拌对连铸结晶器内钢液液面波动有重要的影响。以某钢厂直径为250 mm 连铸圆坯结晶器及电磁搅拌器的相关参数为原型,采用湍流模型与多相流模型相结合的方法对电磁搅拌作用下连铸结晶器内钢液液面波动行为进行研究,分析了电磁搅拌作用下钢液液面产生变化的成因。研究结果表明:电磁搅拌作用下钢液液面呈旋转抛物面,与无电磁搅拌作用下的液面截然不同;电磁搅拌作用下钢液液面波动实质上是电磁搅拌电磁力作用的结果。水口附近液面波动会随着电磁搅拌强度的增大而增强,达到一定值时出现卷渣现象。在实际生产过程中,为获得较好的搅拌效果,应考虑结晶器内的液面波动及卷渣行为。 相似文献
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实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。 相似文献
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<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic 相似文献
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正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform. 相似文献
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正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness. 相似文献