基于减法聚类的模糊神经网络转炉终点温度预报模型

分析了对转炉终点温度的影响因素,利用减法聚类自动确定模糊规则的数目,建立了模糊神经网络系统预报转炉终点温度.结果表明,该方法建立的模型能够对终点温度进行较好的预报,误差在±4℃以内的命中率可达25.49%;预报误差小于±20℃的炉数可达84.31%.     

VD炉终点钢液温度预报

开发了较完善的 VD炉终点钢液温度在线预报系统 ,应用神经网络方法对 VD炉终点钢液温度进行预报 ,系统在线连续预报了 76炉次 ,预报温度与实际测量温度之差在± 4℃、± 5℃、± 6℃之内的炉次分别占 67.1%、80 .3 %、89.5 %。文章最后分析了误差产生的原因     

基于副枪控制的转炉终点预测模型

利用转炉吹炼末期脱碳指数方程、热平衡和热力学方程分别建立了转炉终点碳、温度、磷和锰的预报模型.终点碳质量分数预报误差为±0.015%的命中率达到87.6%;转炉终点目标w(C)=0.03%时,温度误差范围±10 ℃的比率为85.4%;模型预报钢中w(Mn)误差在±0.02%、w(P) 误差在±0.003%范围的比率分别达到了87.0%和81.2%.建立的预报模型具有较高的精度,实现了转炉终点碳、温度、残锰和磷的同时预报,为提高转炉的终点控制命中率、减少补吹的次数、实现直接出钢打下良好的基础.     

应用改进的神经网络模型预报转炉冶炼终点

准确预报转炉冶炼终点的钢水温度与碳含量对提高转炉终点命中率具有重要意义。针对现有多层前馈网络学习算法的不足,基于BP模型提出一种改进算法,建立了复吹转炉冶炼终点的预报模型,并与BP模型的预测结果进行了统计比较。研究表明,改进后的模型能够对冶炼终点进行良好的预报。采用单节点输出模型对终点钢水碳含量与温度分别进行预报,预测误差w(Δ[C])<±0.03%的命中率达97.22%,Δt<±12℃的命中率为94.44%。还建立了神经网络双节点输出模型对转炉终点钢水碳含量及温度同时进行预报,误差Δt<±15℃、w(Δ[C])<0.03%的双命中率为76.92%。     

重轨万能连续轧制过程温度预报的数学模型

针对万能可逆连轧重轨轧制过程,选取了适用于轨形孔型、万能孔型轧制阶段合理的温度变化数学模型,编制了预报不同时刻重轨轨头、轨腰、轨底半均温度的计算程序.结果表明,轧制过程轨腰温度最高,轨头其次,轨底最低,轨头、轨腰、轨底温度的预报值与实测值的相比,误差分别为≤11.4℃、≤14.5℃和≤9.8 ℃.     

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%。     

转炉吹炼温度预报人工神经网络模型的开发

采用人工神经元网络技术开发了转炉冶炼终点钢水温度预报模型.利用宝钢的实际生产数据对模型进行训练,并编制了相应的应用软件.软件运行结果表明,钢水温度预报模型验证精度误差在±12℃范围内的占60%以上,建立的模型精度可以满足现场工艺要求.     

基于案例推理的钢水温度在线管控模型

钢水温度的精确管控有利于提高铸坯质量和降低生产成本。针对目前炼钢—连铸区段钢水温度在线管控方面存在的不足,在分析钢水温度影响因素的基础上,建立了基于案例推理的炼钢—连铸区段钢水温度在线管控模型。同时通过调整案例推理算法的相似度计算方法、权重计算方法、重用案例个数等参数提高模型的精度。结果表明:转炉出钢温度预定模型平均降低转炉出钢温度6℃,精炼结束温度预定模型提高连铸开浇温度命中率2.33%。精炼开始温度,精炼结束温度和连铸开浇温度预报模型误差小于10℃的命中率分别达到75.33%、98.33%和95.67%,且均高于神经网络模型。     

高温持久试验温度多点测量误差的来源及其改进措施

高温持久试验在整个试验时间内,温度波动根据冶标YB—899—77规定:试验温度≤600℃,允许±3℃; 600～900℃,允许士4℃;900～1200℃,允许±5℃。因此近年来很多人对提高控制温度的精度减少测温误差做了很多的研究和探讨。我们在这方面做了一些工作,今作一简略介绍,以供参考。 一、测温系统的误差机理 在用热电偶作测温敏感元件时,其原理基于下列公式:     

含钒低合金钢高温变形抗力研究及应用

利用MMS-200热力模拟试验机对510 MPa级含钒低合金钢在850～1 100℃温度区间变形抗力进行研究,分析试验中变形温度、变形速率和变形程度对变形抗力的影响规律,并根据试验研究结果优化和完善热连轧变形抗力数学模型,该品种轧制力预报误差由8%～10%降低到5%以下,有效提高了过程控制数学模型的预报精度。     

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.