350kA铝电解槽集气烟道改造及运行实践

运用计算流体力学软件Fluent对某电解铝厂350 kA铝电解槽集气烟道内的烟气流动场进行了模拟仿真计算。根据模拟计算结果,评估了集气烟道的集气效果及其对热平衡的影响,并以此为基础指导原设计烟道的结构改造。经三个月的生产运行和跟踪测量,证明烟道改造后的电解槽集气效果和槽膛内散热均匀性有显著改善,电解槽排烟量降低5.3%,槽上散热量减少约20 mV,为电解槽和净化系统实现节能减排创造了条件。     

350kA铝电解槽上部结构节能改造实践

某铝厂350kA电解槽上部结构存在集气效果差和下料点分布不均易引发阳极效应等问题。通过节能改造,将下烟道集气改为上烟道集气结构,烟道集气的压力损失由345Pa降低至201Pa,提升水平烟道内烟气流速至14m/s以上,提高集气的效率和均匀性,有效解决烟道积灰的问题。改造升级打壳下料系统,解决原设计下料点间距分布差距较大和采用传统气控分组下料模式不利于均化氧化铝浓度分布,容易引发阳极局部效应等问题。将大梁结构最大挠度值由26.69mm降为26.65mm,保持改造前后整体结构刚度不变。现场实际表明,本次改造在保证大梁结构可靠的情况下,有效的解决了原设计存在的问题,达到预期效果。     

NEUI 600kA级铝电解槽烟气流场测试与研究

为了提高电解槽的集气效率,减少烟气的无组织排放,对两台NEUI 600 kA电解槽内部的烟气流场进行测量。通过分析测试数据发现,在X方向上,两台电解槽槽罩板内烟气的温度分布均呈中间高、两边低的趋势,最高温度的点位不固定,出铝端烟气的温度高于烟气端;其中一台电解槽槽内的负压整体比较均衡,但个别位置的负压波动比较大,甚至有部分位置处于正压状态;另一台电解槽负压呈中间大、烟道端和出铝端较小的趋势。烟气温度和压力数据表明内部烟气流场与设计基本符合;电解槽出口的烟气量、负压值也与设计值基本吻合。     

基于数值仿真开发的电解槽集气系统

利用FLUENT对电解槽烟气流动场和温度场进行数值模拟,并结合设计经验,成功开发出适用于SY系列电解槽的多段等量吸风集气烟道结构和双烟管技术。多段吸风集气烟道结构采用上烟道集气形式,在强化集气效果、均衡槽膛风压分布的同时,可大幅降低电解槽排烟量,使烟道阻力下降17%~27%。双烟管技术则在挪威海德鲁(HYDRO)和法国索罗斯(SOLIOS)的方案上进行改进,主、副烟管均由净化风机提供负压动力,进行开槽作业时,主副烟管同时集气,烟气量可瞬时增大2~3倍,有效控制电解车间的污染物无组织排放,达到了节能减排的目的。     

仿真模拟在350 kA铝电解槽集气烟道改造中的应用

针对现有电解槽集气烟道系统存在的烟道阻力大、粉尘沉积、集气效率低等问题,本文利用FLUENT软件对其进行模拟仿真计算。根据模拟结果提出铝电解槽集气烟道的优化方案并应用于现有电解槽的改造。改造后,取得了良好的效果。     

重庆旗能新型高位分区集气在铝电解中吸氟效果明显

正重庆旗能电铝有限公司大修槽1053~#通过技改,采用的新型高位分区集气结构,实现了电解铝生产中所产生的氟化氢气体有效收集。与传统的电解槽下部V型烟道集气槽1054~#槽对比,1053~#槽烟气中氟含量为44.51 mg/m~3,而1054~#槽烟气中氟含量为24.79 mg/m~3,烟气中的氟含量通过净化系统再     

240 kA系列化铝电解槽深度节能改造和电流强化实践

本文借助多物理场仿真模拟，对某已停产240 kA系列电解槽的母线、阴极组结构、内衬和上部结构等进行针对性升级设计，显著提升了电解槽磁流体稳定性、热平衡“健康”稳定性和集气效率，大幅降低了阴极压降，为电解槽在低电压、低能耗和更高电流密度下长期稳定运行创造了条件。改造完成并重新投运后，辅以电解槽焙烧启动和生产运行工艺技术条件管控优化，电解槽运行电流强化至260 kA,系列年原铝产能增加近14 000 t,平均铝液直流电耗从改造前的13 343 kW·h/t-Al降至12 463 kW·h/t-Al。     

浅谈电解烟气净化的优化与管控要点

针对目前净化工艺中存在的烟气捕集率低、系统负荷大、净化效率低等诸多缺陷,在400 kA铝电解槽上采用新型两段逆流干法净化工艺。通过改善烟道集气结构、排烟管道和干法净化工艺;调节氧化铝供料及投料方法;改进并提高除尘器性能,取得了良好的烟气净化效果。     

350 kA电解系列端头电解槽磁场分布优化的模拟研究

基于某铝业公司正在运行的350 kA电解系列端头电解槽槽况不稳影响了端头槽正常生产的情况,分析了端头电解槽磁场较普通槽磁场差的原因,提出了优化端头外母线的设计方案,并通过数值模拟计算了优化前后的端头电解槽磁场分布情况。模拟计算结果表明,优化后的端头电解槽磁场分布明显好于优化前的,而且可以满足稳定生产的需求。     

锂电解槽多物理场耦合模拟

基于对30 kA电解槽流场、电磁场、电热场的研究,利用得到的电流强度与结构参数的关系,对40 kA电解槽进行结构参数优化,得到最优40 kA电解槽槽型。经电—热—磁—流场耦合研究,对比30 kA电解槽流场、电磁场、电热场分布。结果表明,优化后的40 kA电解槽电阻电压降低了0.33 V,电解槽中电解液温度分布变化并不明显,磁场强度的增幅均在10%以内,流场分布中涡流范围有所减少。在能量平衡条件下,40 kA电解槽磁流场分布相对30 kA电解槽更加稳定。     

熔炼次数对M17返回料合金成分、组织和性能的影响

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。     

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.