大型高炉转炉铁钢界面铁水温降分析

介绍了鞍钢大型高炉转炉铁钢界面工艺流程,分析了影响铁水温降和铁钢界面系统优化的因素。分析表明,铁水罐运行数量是影响温降的关键因素。通过采取优化鱼雷罐运行的措施,根据炼钢工序的生产节奏综合配备鱼雷罐,并对鱼雷罐的周转节点进行约束,匹配高炉铁水供应节奏,组织铁水调运,使鱼雷罐的平均周转次数提高到3.34次/日,运输过程温降达0.96℃/min。     

鱼雷罐车铁水温降因素分析及控制措施

文章通过实例分析了影响鱼雷罐车中的铁水温降的因素,铁水的装入量、鱼雷罐砖衬厚度、空、重罐运行时间等,研究提出了减少温降的措施,经实践证明,能有效地控制鱼雷罐铁水温度的下降速度。     

绝热保温型铁水罐的应用

为了减少铁水在运输过程中的温降,鞍钢炼铁厂采用了绝热保温型铁水罐。使用结果表明,比普通罐减少铁水温降6～8℃(铁水运输时间90min,每昼夜运行3～4次)。若罐口加保温材料(或加罐盖保温)效果更好,可减少铁水温降30～35℃,节能效果十分显著。     

铁钢工序界面铁水温降预测系统的开发与应用

鱼雷罐作为铁水转运过程中的主要工具,在其运输过程中的铁水温降会直接影响后续工艺的进行。如果能够对鱼雷罐内铁水温度提前预测,则会为铁水物流生产调度的优化等带来十分重要的意义。首先基于某钢厂铁水转运工艺流程,确定铁水温降的各个影响因素,对鱼雷罐铁水温降进行多因素模拟分析,获得铁水温降预测模型;其次基于现场实际生产数据,结合已建立的铁水温降预测模型,依据模块化设计原则开发在线铁水温降预测模型;最后,利用现有铁水智能管理系统对铁水温度变化趋势和特定时刻的铁水温度实现可视化。该系统的现场运行结果表明,模型计算值与实际值吻合较好,系统的在线应用提高了鱼雷罐的在线周转率,降低了铁水温降,提高了钢铁企业的自动化控制水平。     

鱼雷罐铁水温降分析

为了分析铁水在输送过程中的温降，开发了鱼雷罐中铁水温降数学模型。该模型巳在宝钢实际使用，铁水温度的计算值与实测值吻合良好。利用该模型分析了各种因素对铁水温降的影响，讨论了减小铁水温降的措施。     

唐钢铁水“一罐到底”技术设计与应用

介绍了传统的铁水供应方式，对比了混铁炉工艺和鱼雷罐车工艺的优缺点，在此基础上提出了“一罐到底”工艺，并采取了多种措施为其保驾护航，包括保证高炉铁水波动小，硅含量稳定；高炉除铁场下方安装轨道衡，对铁水进行精准称量；铁水包加盖，减少温降；采用铁路运输方式，并保证炼铁-炼钢车间合理的铁水调度。“一罐到底”工艺取消了传统的混铁炉或鱼雷罐车，不经历铁水二次倒罐环节，使得炼铁-炼钢两个工序无缝衔接，在减少铁水温降、节能降耗、减轻环境污染、降低一次投资成本及运行成本方面效果显著。     

加盖鱼雷罐的铁水温降分析

以装载260t铁水的鱼雷罐为研究对象,利用ANSYS有限元软件建立二维传热数学模型,考虑罐体物性参数随温度变化的非线性、辐射的非线性等因素,模拟实际生产状况下鱼雷罐罐体、罐壳及铁水的温度场,分析了加盖对鱼雷罐内衬和外壳温度随时间的变化关系及铁水温降的影响。结果表明:加盖可明显降低罐体内衬及铁水的温降速率,温度下降幅度随时间的延长越来越小;无盖情况下,空罐时间每减少1h,铁水温降会相应平均减少4.2℃,而重罐时间每减少1h,铁水温降会相应平均减少19℃,加盖后空罐时间每减少1h,铁水温降相应平均减少3.1℃,重罐时间每减少1h,铁水温降相应平均减少16.8℃;加盖后每小时的铁水温度会比无盖铁水高1.1～2.2℃,空罐8h重罐5h后加盖铁水温度比无盖铁水高19.4℃。     

鱼雷罐耐材蓄热及散热模型的铁水温降

基于某炼铁厂鱼雷罐热周转过程,建立鱼雷罐热周转耐材蓄热及散热模型,通过数值模拟计算得到鱼雷罐运输铁水的散热量,进一步获得铁水温降.利用该方法对影响铁水温降的主要因素即空罐时间、重罐时间、周转次数、铁水质量和铁水初始温度进行全因子组合试验分析,对试验结果进行多元线性拟合,获得鱼雷罐运输铁水温降的预测模型,并用该模型与现场生产数据进行比较,结果表明该模型的预测误差控制在8.1％以内.     

铁水运输过程热损失模拟计算浅析

为了考察铁水运输过程中的热损失,开发了铁水运输过程温降数学模型。该模型准确性较高,计算结果与现场数据吻合良好。利用该模型对铁钢界面的3种铁水运输工艺进行了能效对比分析,得到了不同运输条件对铁水运输过程能效利用的影响等一系列结果。结果表明,铁水表面加保温剂或加保温盖能够显著减小铁水温降,存在临界运输距离和临界运输时间使得鱼雷罐-兑铁包工艺和一罐到底工艺的铁水温降相等,兑铁包初始温度对临界运输距离和临界运输时间均有影响。     

鱼雷罐内衬材料结构的保温优化设计

为了减少鱼雷罐运输过程中的铁水温降,从耐火材料内衬的保温效果出发,对内衬结构进行了优化,增加保温层,并对优化前和优化后的结构的铁水温降和保温效果进行理论计算,结果表明,重罐8 h的情况下铁水温降可降低38℃,鱼雷罐钢壳温度可下降约52℃。     

China's Major Non-ferrous Metals Imports & Exports

正~~     

Zinc Production by Province in 2014

正~~     

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.