基于AdaBoost.RS算法的LF炉钢水温度预报分析

LF炉钢水温度的精准控制有利于缩短钢的冶炼时间,从而节约其生产成本。而获得准确的LF炉钢水温度预报是钢水温度控制的先决条件。通过分析LF炉冶炼过程对钢水温度的影响因素,提出一种适用于LF炉钢水温度预报同时具有增量学习功能的AdaBoost.RS集成建模算法。该算法引入松弛变量和遗忘因子2个参数,在提高预测精度的同时,可以克服大噪声数据带来的干扰,同时增量学习可以降低早期生产数据对模型的影响。以福建三钢有限责任公司100tLF炉为研究对象,采用5个测试函数验证算法的抗噪性能,分别用静态数据和动态数据对钢水出站的终点温度进行预报。实验结果表明,预测的绝对误差小于10℃的样本数量超过了样本总数的90%,算法精度较高,有利于实际生产应用。     

涟钢LF精炼温度变化研究

采用多元回归分析方法建立了涟钢210转炉厂LF钢包炉精炼终点钢水温度的变化模型,应用该模型对LF精炼终点钢水温度进行预测,对预测结果进行了统计分析,结果表明该模型对LF钢包炉精炼终点温度的预测误差较小,能对现场产生指导意义。     

LF钢包炉精炼终点钢水温度的预报模型

采用多元回归分析方法建立了宝钢一炼钢厂LF钢包炉精炼终点钢水温度的预报模型，应用该模型对LF精炼终点钢水温度进行预测，对预测结果进行了统计分析，结果表示该模型对LF钢包炉精炼终点温度的预测误差在＋10℃时的命中率达到95％。     

基于PCA-BP神经网络的LF精炼终点温度预测

为提高LF精炼钢水终点温度控制水平，提出了基于主成分分析（PCA）和BP神经网络的联合方法预测LF钢包炉精炼钢水终点温度。基于冶金理论和实际生产实践，选取了42CrMo钢生产过程的10个对终点温度有显著影响的因素作为预测模型的指标体系，然后借助主成分分析法对样本数据进行处理，得到了7个主成分变量，累计方差贡献率为87.24%，消除了数据之间的关联性，以此为基础，建立了基于PCA-BP神经网络的LF炉终点温度预测模型，该模型预测误差在±25℃时，模型的命中率为98.71%，模型有较好的识别能力，能够达到LF炉生产过程预测终点温度的目的。     

LF炉精炼温度预报模型的发展应用

全面综述了LF炉精炼温度预报模型在国内外的发展应用状况。国内外所开发的LF炉钢水温度预报模型,主要采用机理模型、“黑箱模型”、“灰箱模型”三种方法。简单讨论了这三种模型的特性,并预测了LF炉精炼温度模型的发展趋势。     

基于改进人工神经网络的LF钢水终点温度预报

采用改进的人工神经网络算法,开发了40t钢包炉精炼时钢水终点温度预报模型。与传统BP网络算法相比较,改进算法可提高预测速度和精度。生产现场实验表明,传统BP神经网络算法,钢水温度预测误差±5℃的炉次仅为77%,用改进的BP神经网络算法,其误差±5℃的炉次为90%。     

LF炉钢水成分预报模型的建立及应用

宣钢LF炉钢水成分预报模型,通过机理模型算法,准确、快速地提供了精炼过程中钢水成分的实时预报,减少了精炼通电时间和测温次数,提高了精炼生产效率;充分发挥了LF炉优质、低耗、低成本的优势,保证了连铸生产的顺行.     

基于GA-PSO-BP神经网络的LF终点温度预测

针对LF冶炼特点和现有钢水温度预报方法存在的不足,提出了一种新的预测LF终点温度的BP神经网络模型。用遗传算法(GA)和粒子群算法(PSO)混合优化BP神经网络的权值和阈值,提高BP神经网络的预测精度。混合模型既克服了传统机理模型难以准确实现的困难,也弥补了传统BP算法的不足,结合了2种算法的优点,改善了预测模型的收敛性能。开发了基于Java语言的现场应用软件。仿真结果表明,该算法可以提高预测精度和速度,预测误差在5℃以内的炉次达到了88%。     

智能LF控制系统的研究

提出一种基于人工神经网络的智能LF控制系统模型,该系统的核心是LF精炼过程钢水温度和成分的实时预测,并确定了一种部分反馈的人工神经网络进行钢水温度和成分的实时预测。     

LF精炼终点钢水温度灰箱预报模型

LF精炼工序在炼钢过程起着调节温度的关键作用,准确预报LF精炼终点钢水温度对实际生产有重要意义.传统的LF精炼预报模型包括机理模型与黑箱模型.机理预报模型能够体现各工艺因素对终点钢水温度的影响,但由于LF精炼传热机理研究尚不完善,依靠机理模型预报终点钢水温度,难以达到预期效果;黑箱预报模型能够准确预报终点钢水温度,但不能反映精炼过程各工艺因素对钢水温度的影响,尤其当生产工艺条件发生改变时,黑箱模型在应用上会受到限制.本文以方大特钢LF精炼炉为研究对象,建立一种机理预报模型与黑箱预报模型(BP神经网络预报模型)相结合的LF精炼终点钢水温度灰箱预报模型.该模型既能反映各工艺因素对终点钢水温度的影响,又能准确预测终点钢水温度,其终点钢水温度预测误差在±5℃以内的命中率可以达到95%以上.      

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.