共查询到19条相似文献,搜索用时 93 毫秒
1.
采用二维简化的炉壁模型,用ANSYS软件进行热传导仿真计算,同时在MATLAB环境中建立BP网络模型,并利用炉壳外部测点的温度值识别炉壁侵蚀线,从而证明了神经网络方法在高炉炉壁侵蚀状态预测中应用的可行性。 相似文献
2.
在复吹转炉所受剪切应力和冲击应力分布的模型实验研究基础上,本文研究了不同炉型的炉衬所受剪切应力分布,为合理选用炉型提供依据,实验结果表明,底吹对延长转炉炉衬寿命有利,转炉下部形状的合理性可以减少流动死区和降低液面波动;还表明在复吹转炉内接近钢液面的炉衬所受侵蚀最为严重。在受损最严重的地方可以采用特殊材质的炉衬或使炉壁向上呈有扩张趋势的梨状炉型,来达到减少炉壁受侵蚀的速度,同时还讨论了转炉大小与底吹 相似文献
3.
阐述了通过一些小的技术改造,在机械设备允许的条件下进行合理扩容,将三支电极向中心倾斜,增加电极到炉壁的距离,降低耐火材料的侵蚀指数。提高炉壁的水冷效果,实施水冷挂渣技术。增加铁水装入量,缩短冶炼周期的方法。在现场实施后,效果良好。 相似文献
4.
5.
对参与介质的非灰行为采用灰气体加权和(WSGG)模型,并把WSGG模型与段法结合分析计算了简单加热炉中炉壁黑度对炉内辐射热交换的影响。计算结果表明,加热物料吸收的净辐射热流随炉壁黑度的增加而减少 相似文献
6.
7.
用段法分析高辐射率涂料强化传热的机理 总被引:1,自引:1,他引:0
用段法计算了灰体和非灰介质加热炉中的热交换,分析了炉壁热阻和炉壁内表面黑度对炉内辐射换热的影响,阐明在不同的介质中,炉壁特性对炉内辐射传热影响的机理是不同的,第一次得出在非灰介质加热炉中,炉壁温度会随炉壁黑度的增大而降低的结论。 相似文献
8.
针对宝钢电炉冶炼过程中,炉衬渣线镁碳砖耐火材料侵蚀严重导致电炉炉龄偏低的问题,通过对镁碳砖耐火材料侵蚀微观结构的观察及钼丝炉内炉渣侵蚀镁碳砖试验,得知FeOx·MnO·MgO相是镁碳砖耐火材料溶解到炉渣后形成的主相,渣中FeO、MnO具备了溶解MgO能力,炉渣中FeOx含量偏高是导致镁碳砖耐火材料侵蚀严重的主要因素;电炉炉渣体系内,炉渣碱度对镁碳砖耐火材料侵蚀影响不明显。钼丝炉内炉渣侵蚀试验表明:温度越高,镁碳砖耐火材料侵蚀越严重;高温段保温时间对侵蚀影响不大;渣线镁碳砖耐火材料进行冷热交替试验后,镁碳砖耐火材料侵蚀相对严重。根据试验结果,采取降低炉渣FeOx含量、缩短冶炼过程炉与炉之间间隔时间等措施,炉壁镁碳砖耐火材料侵蚀得到缓解,电炉中期炉龄稳定提升到450炉以上。 相似文献
9.
10.
11.
12.
13.
按照现代控制理论,利用人工神经网络方法,把高炉视为多输入—单输出系统,结合高炉生产实际建立了石钢高炉铁水含硅量神经网络预报模型。通过引入动态步长和惯性项系数提高了网络收敛速度。采用不断更新学习样本集的方法提高了铁水含硅量预报的命中率。结果表明:在允许误差为0.1%时,命中率达到了86.67%,可以为高炉操作提供指导。 相似文献
14.
应用人工神经网络方法中的误差逆传播模型(BP)建立了高炉炉喉煤气而分布数学模型。该数学模型在攀钢4高炉VAX机上在线运行,能连续推测炉喉煤气流分布,其命中率达到82%,有效地指导了高炉操作。 相似文献
15.
The on-line analysis of operational data and prediction of furnace irregularities, though difficult, are essential for the improvement of the control of blast furnace operation. Three models based on artificial neural networks for the recognition of top gas distribution, distributions of the heat fluxes through the furnace wall, and for the prediction of slips have been designed. The off-line test results showed that a trained perceptron network could recognise various types of top gas profiles. A classifier consisting of a self-organising feature map network and a learning vector quantizer could classify the characteristic patterns of heat flux distribution; and a model based on a back propagation network could properly predict the probability of upcoming slips in advance. The most important operational variables needed for predicting slips have also been extracted. It has been proved that the neural network used has a good capability of predicting furnace irregularities. 相似文献
16.
按照现代控制理论,把高炉视为多输入单输出系统,利用人工神经网络方法,结合高炉生产实际,建立了石钢高炉铁液中硅神经网络模型;通过引入动态步长和“惯性项系数”提高了网络收敛速;并不断更新学习样本集,提高了铁液中硅预报的命中率。结果表明,在允许误差为0.1%时,命中率达到86.67%,可为高炉操作提供指导。 相似文献
17.
Blast furnace scheme design is very important, since it directly affects the performance, cost and configuration of the blast furnace. An evaluation approach to furnace scheme design was brought forward based on artificial neural network. Ten independent parameters which determined a scheme design were proposed. The improved threelayer BP network algorithm was used to build the evaluation model in which the 10 independent parameters were taken as input evaluation indexes and the degree to which the scheme design satisfies the requirements of the blast furnace as output. It was trained by the existing samples of the scheme design and the experts' experience, and then tested by the other samples so as to develop the evaluation model. As an example, it is found that a good scheme design of blast furnace can be chosen by using the evaluation model proposed. 相似文献
18.
在运用模糊神经网络进行预测的基础上,建立了一种应用小波理论对时间信号进行去噪,根据去噪处理对模糊神经网络作相应处理的预测模型,并将所建模型应用于高炉炉温预测。仿真结果证明小波模糊神经网络比模糊神经网络更具优越性,预测准确率明显提高。 相似文献
19.
����������� ����÷ 《钢铁研究学报》2015,27(11):33-37
Aiming at the inherent defects of the traditional blast furnace temperature model, a kind of grey relational analysis based ELM (extreme learning machine) temperature prediction model was put forward. Due to the characteristics of ironmaking process with multivariable nonlinear, strong coupling, the traditional modeling methods were unable to meet the requirements of high precision prediction of blast furnace temperature. Firstly, the correlation of input variables was analyzed with the gray correlation analysis, and then the performance of the model was improved. Secondly, combined with analytical variables, the neural network was trained by ELM learning algorithm. Finally, the field data was used for training and testing of the network, and then compared with the traditional model. The results show that the model can predict the blast furnace temperature quickly and accurately, and also can meet the guide workers to manipulate the needs of blast furnace. 相似文献