稀土萃取搅拌槽不同挡板的三维流场数值模拟

采用计算流体动力学(CFD)的方法,分别对稀土萃取中竖式挡板和三角形挡板的搅拌槽内三维流场进行数值模拟。选用多重参考系法和标准k-epsilon双方程模型进行模拟,对两种挡板的速度分布云图、速度矢量图和湍流动能云图进行对比分析,为搅拌槽的结构设计与优化提供理论依据。     

基于单相LBM模拟大平板反重力充型过程

采用单相格子Boltzmann方法研究大平板的反重力充型过程,该模型不需考虑气相格子的变化,从而提高了计算效率.针对该方法,本文新提出了一种权重系数重新分配的方法来处理格点中的液相排出及分配问题.首先用该模型计算了单浇口条件下的大平板型腔反重力充填过程,以相同参数下的高速相机成像的水力充填实验为参照,数值模拟的流场特征及流体形态与实验结果吻合良好.另外,还采用线速度分布云图,并提出了自由表面的高度差判据来分析充型过程中的流场区域特征和流体平稳程度.在此基础上,继续用该模型研究了双浇口和圆柱扰流条件下的大平板反重力充型过程.双浇口条件下由于浇道间的互相影响,流场中形成的漩涡多于单浇口;圆柱扰流条件下的充填方式会降低流体的晃动程度,提高充型的稳定性.      

三层桨搅拌槽内三维流场的数值模拟

采用计算流体动力学(CFD)的方法,对稀土萃取过程中上两层为平直叶、底层为涡轮桨叶的三层组合桨搅拌槽内三维流场进行了研究。利用标准的k-epsilon双方程模型对无机相(水)和有机相(P507)的混合液在搅拌槽中产生的流场进行数值计算,得到这种搅拌桨以恒定转速300r/min在搅拌槽内转动时产生的速度场和压力场,以及速度分布云图、速度矢量图以及压力云图,为搅拌桨的设计与改进提供理论基础。     

弹性力学问题Marc求解与边界元求解比较

用基于有限元方法的Marc软件和边界元法源程序求解弹性力学问题,推导出弹性力学问题的有限元和边界元公式,并采用二次元编写边界元法源程序。对受内压的中空活塞气缸的变形进行分析,通过比较两种方法分析的结果以及与解析解的相对误差,进而得出一些关于有限元和边界元新的结论。     

基于Simulation的钨砂搅拌罐有限元静力学分析

通过应用Simulation进行有限元静力学分析,对搅拌罐结构进行比较精确的分析和计算。通过设置边界、载荷、约束条件,并且进行网格的划分,研究搅拌罐在受钨砂载荷和自重的作用下模拟出搅拌罐应力、应变、位移和安全系数等效云图,根据云图对应力、应变、位移和安全系数数值进行分析校核,能直观判断是否存在应力集中,同时能根据现有数据寻求改进措施。     

应用格子 Boltzmann方法直接数值模拟研究钢中夹杂物上浮及碰撞行为

采用格子Boltzmann方法对钢液中夹杂物上浮及上浮过程中的碰撞行为进行直接数值模拟研究.结果表明,不同尺寸夹杂物颗粒上浮速度的模拟结果和理论值基本一致,表明本文所采用的数值算法能够精确有效地对钢液中固相夹杂物颗粒运动行为进行研究.当钢液中直径为80μm的夹杂物颗粒位于直径为40μm的下方并一起上浮时,直径为80μm的夹杂物颗粒会逐渐追赶上直径为40μm的夹杂物颗粒并发生碰撞形成大尺寸凝聚体,凝聚体的上浮速度显著大于二者单独上浮时的上浮速度.对于直径为40μm的夹杂物来说,形成凝聚体后的上浮速度比单独上浮时的上浮速度增加300%.实际炼钢过程中,采取必要的措施增加夹杂物颗粒之间上浮过程中的碰撞凝聚,对于提高夹杂物颗粒的上浮速度,尤其是小尺寸夹杂上浮去除速度,提高钢液的洁净度具有重要的意义.      

后混合磨料水射流除鳞喷嘴内部流场数值模拟

基于CFD多相流欧拉模型,针对后混合式磨料水射流除鳞喷嘴中磨料与水混合均匀性差、射流能量利用率低的缺点,应用Fluent软件对磨料侧进式、切进式和平行多射流式3种进料方式的喷嘴进行三维数值模拟,通过喷嘴内部流场速度矢量图分析了3种进料方式下高压水与磨料的作用机理,并通过磨料体积分数云图比较了流场的均匀性.结果表明:与磨料侧进式喷嘴相比,磨料切进式和平行多射流式喷嘴能够改善磨料与水的混合效果,使流场内磨料分布均匀.但切进式喷嘴会增加喷嘴内部的磨损,需要采用更耐磨的材料.与前两种喷嘴相比,平行多射流式喷嘴可得到磨料与水最好的混合均匀性,实际应用中还可以根据需要对水射流的流量及作用方式进行调节.     

泵轮式混合澄清槽混合室单相流的CFD模拟

采用有限元软件Fluent对泵轮式混合澄清槽混合室内的单相流进行数值计算,以雷诺应力模型作为基本方程,模拟混合室内单相流动。通过分析混合室内单相流的速度矢量图、压力云图确定泵轮抽吸高度、泵轮循环流量等参数。结果表明:混合室泵轮区域及附近存在较大的流体循环,混合作用主要发生在泵轮及其下部的一个较小的范围内;泵轮中心区域和吸液管内的压力明显低于周围混合室压力,从而形成泵轮的抽吸作用;泵轮抽吸高度模拟结果略大于试验结果,经过矫正与试验结果吻合很好,证明了模拟结果的可靠性。     

三通阀体零件多向主动加载成形过程数值模拟

利用有限元分析软件Msc.marc模拟三通阀体零件多向主动加载成形过程。通过分析各种多向主动加载的等效应变云图及凸模的受力情况，确定最佳的工艺成形方案，并通过速度矢量图详细论述其金属成形时的流动规律，为此类零件的工艺设计提供依据。     

镁砂煅烧窑烟气脱硝SCR法的应用与流场分析

介绍了菱镁石煅烧窑烟气的特点和危害以及SCR脱硝方法的原理与工艺流程,并且利用Fluent软件,采用标准湍流模型和多孔介质模型对SCR反应器的流场进行了数值模拟,此反应器是以某厂菱镁石高温煅烧窑烟气为对象,通过数值模拟来寻求优化设计.数值模拟结果表明,在SCR反应器内加装整流器对流场略有改善,且整流器格子大小对流场影响不大.模拟结果还得出导流板的最佳结构和位置,可以达到良好的脱硝效果.     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<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     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

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,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

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     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

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     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

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,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

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.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

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.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.