样本自选择回归分析算法在转炉炼钢中的应用

针对转炉炼钢静态控制模型广泛采用的常规回归分析算法采用目标炉次的前几炉次冶炼数据作为样本,模型预测准确度低的问题,提出了一种基于样本自选择的回归分析算法。该算法从实际生产数据中自动选取一定数量的合适样本来构建回归分析预测模型,实现吹氧量、冷却剂加入量、终点温度和终点碳含量的预测。通过某钢厂120t转炉Q235B钢种的实...     

钢铁冶炼新技术讲座之六转炉炼钢新技术(三)

4转炉炼钢自动控制技术转炉吹炼自动控制分为三个阶段:4.1静态控制依据初始条件(铁水重量、成分、温度、废钢重量、分类)。要求的终点目标(终点温度、化学成分)以及参考炉次的参考数据,计算出本炉次的氧耗量,确定各种副原料的加入量和吹炼过程氧枪的高度。静态控制包括三个模型:氧量模型、枪位模型和副原料模型。这样可基本命中终点的含碳量和温度目标。4.2动态控制当转炉供氧量达到氧耗量的85%左右时,降低吹氧流量,副枪开始测温、定碳,并把测得的温度值及碳含量送入过程计算机。过程计算机则计算出达到目标温度和目标碳含量所需补吹的氧量…     

不倒炉转炉炼钢TCO终点控制系统的应用

为了提高终点命中率,引进了不倒炉转炉炼钢TCO终点控制系统,通过制定控制检测方案,实际检测数据表明,钢水温度测准率达到100%,钢水中碳含量测准率达到93.75%,氧含量测准率达到100%。满足不倒炉定碳、测温炼钢的要求。     

超低碳钢的转炉终点控制

 通过对国内某厂300t转炉终点相关数据的理论分析,发现影响转炉终点水平的有：转炉炉龄、转炉终点温度以及吹氧量等。转炉吹炼过程中存在一个临界碳含量。当转炉终点碳含量低于临界碳含量时,脱碳变得困难,钢水过氧化严重。采用规则溶液模型计算转炉渣中FeO的活度,据此计算的临界碳含量（质量分数）为0.02%~0.03%。根据理论分析和实际统计结果,300t转炉理想的终点碳质量分数为0.03%~0.05%。     

基于灰色模型的转炉炼钢终点预报研究

准确预报转炉炼钢的终点钢温度及碳含量,对于提高终点命中率具有重要意义,作者采用灰色系统模型及线性回归补偿模型建立了转炉炼钢终点钢水温度及碳含量预报模型,并对一座１８０ｔ转炉的实测数据进行了仿真,其结果与实际值接近,这表明该方法切实可行并有效的。     

80 t转炉终点预报TSVR模型精度

 转炉炼钢是一个复杂的高温物理化学反应过程。在冶炼过程中不能连续检测钢的成分。所以,准确地预报终点的碳质量分数和温度对于提高终点命中率是非常有意义的。基于广西某钢厂80 t转炉炼钢实际生产数据,建立了终点碳质量分数和终点温度的孪生支持向量回归机(TSVR)预测模型,对100个炉次的实际生产数据进行了模型的训练,另外30个炉次的数据用于验证模型的精度。结果表明,预测误差Δω([C])≤ 0.01%的命中率为93.3%,Δt≤15 ℃的命中率为96.7%,双命中率为90%。与BP神经网络模型相比,TSVR模型的终点碳质量分数和终点温度命中率均比BP神经网络模型高。     

转炉副枪模型取样与倒炉取样碳含量偏差大的原因分析及改进

针对承钢150 t转炉副枪自动炼钢出现的终点TSO取样碳含量与倒炉及吹氩站取样碳含量存在偏差较大的问题展开分析。通过对炉内TSO定氧量,钢水液位,渣厚,底吹效果等数据的收集整理,分析了钢液碳含量偏差较大的原因。采取改变机烧矿加入方式和时机、合理调整底吹流量及稳定兑钢量措施后,结合造渣量的多少、出钢钢流的观察,TSO结晶温度和氧电势的变化范围等操作经验,使TSO取样碳含量更具代表性。杜绝了实际生产中"假拉碳"现象,降低了炉衬腐蚀,为延长炉龄奠定了基础。     

在150 t转炉上用质谱仪进行钢水连续定碳

介绍了本溪板材股份有限公司150t转炉引进的国内第一套转炉炉气分析系统，并对利用质谱仪进行钢水连续定碳进行了研究。结果表明：质谱仪得出的炉气成分中C0、C02和N2在吹炼周期中的变化规律对判断转炉冶炼终点有指导意义；作者开发的碳积分模型和碳指数模型可在转炉冶炼全程控制中配合使用，对终点碳含量低于0．10％的炉次，碳指数模型的命中率较好。     

转炉补吹脱碳升温规律与终点控制研究

对转炉炼钢接近吹炼终点阶段的脱碳升温规律进行了深入研究,并据此建立了转炉补吹模型;采用线性统计回归自适应算法实现转炉补吹模型参数动态修正.结果表明:转炉吹炼后期补吹阶段的总脱碳氧效率与钢水中碳含量呈线性关系,建立的补吹自适应模型在转炉自动化炼钢终点控制中的精度和命中率方面满足了生产需要.     

转炉炼钢静态控制优化模型

对某钢厂氧气顶吹转炉炼钢现场的生产数据进行了统计回归分析,得出了控制终点钢水碳含量与终点钢水温度的氧耗增量与废钢增量的多元回归方程。并对方程进行了优化处理,获 得了转炉炼钢静态控制的优化模型。     

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.