宝钢大型高炉的开炉操作

对宝钢大型高炉的开炉操作经验进行了总结。认为大型高炉的开炉投产,是一项复杂、繁琐的系统工程, 根据工程项目建成时间合理有序地安排设备调试、热风炉烘炉、高炉开炉等工作,可以按预定计划完成高炉开炉,并取得最佳的经济效益。     

安钢2000m3级高炉全焦开炉创新实践

从新的角度系统总结了安钢2000m3高炉开炉技术,如带风装料、炉底点火、全焦开炉和铁口安装通风管等,并详细阐述了开炉前期的人员、设备、原燃料准备情况,以及开炉过程控制、设备维护等工作.     

武钢7号高炉开炉达产实践

对武钢7号高炉开炉快速恢复及达产的主要操作经验进行了总结。武钢7号高炉采用了当今世界一系列新技术、新设备,通过开炉前的精心准备,制定合理的开炉方案,选择合适的送风参数,充分利用烧结矿分级入炉新工艺,准确选择各种操作参数等,实现炉况快速恢复,送风第4天达产,第1个月高炉利用系数达到2．443。     

粤钢1号高炉中修开炉快速达产实践

总结了粤钢1号高炉开炉快速达产达效经验,本次开炉采用木柴填焦热风点火开炉,通过开炉前的精心准备,制定合理的开炉方案,准确选择各种操作参数等,实现炉况快速恢复,送风第5天达到3.03t/m3.d的系数,实现快速达产的开炉目标.     

Monitoring the stress state of the blast-furnace housing

A stationary system of monitoring the stress-strain state of the blast-furnace housing by a coercimetric method is described. The benefits of the stationary system over manual monitoring are outlined.     

宝钢3号高炉的生产及炉型设计

对宝钢3号高炉炉体设计的过程以及炉型与操作制度相适应的过程进行了总结分析。认为这个过程可分为三个阶段:炉型演变期、操作炉型稳定期和炉型维护阶段。厚壁高炉投产初期,炉型存在巨大演变,操作制度难于适应;当操作炉型合理化之后,高炉具备了良好的操控性能和薄壁高炉的特征,炉型与操作制度相匹配,获得了良好的操作指标;高炉经历了10年的生产,进入炉型维护阶段,生产采取了有效的维护措施,使3号高炉仍具有良好的活力,保持良好的指标。     

The effect of rapid heat treatment on the high-temperature tensile behavior of superplastic Ti-6Al-4V

The effect of rapid heat treatment on the microstructure and elevated-temperature tensile behavior of a Ti-6Al-4V sheet has been studied. Nonequiaxed secondary α phase, introduced by rapid heat treatment, increased the flow stress and changed the stress-strain behavior. A finer scale of the microstructures produced by rapid heat treatment, however, resulted in a stress-strain behavior that differed from that reported in the microstructures obtained from a slower, furnace heat treatment. These fine structures exhibited higher values of m, greater elongation, and lower flow stresses. The stress-strain behavior was found to be dependent on the prior-β grain size; this effect was not observed when the material was furnace heat treated in the β-phase field. The stress-strain curve gradually changed from exhibiting continuous strain hardening to exhibiting a peak stress followed by strain softening, i.e., the superplastic behavior of the as received material gradually diminished as the prior-heat-treatment temperature increased.     

大型预焙铝电解槽早期破损初探

就大型预焙铝电解槽早期破损这一现象,结合近几年投产的部分铝厂尤其是连城铝业电解新系列启动的经验进行了分析,指出筑炉材料和筑炉质量、焙烧启动制度以及焙烧启动过程的管理是造成早期破损的主要原因,并针对这一现象提出了应对措施。     

浅谈燃气锅炉炉膛灭火保护系统在新65t锅炉系统中的应用

煤气锅炉炉膛灭火保护系统，是燃烧器管理和燃料安全联锁系统，它能在保证锅炉正常工作和启动、停止等运行方式下，连续监视燃烧系统的参数和状态，通过联锁使燃烧设备部件按照既定的程序，完成操作或处理未遂性事故，以保护锅炉炉膛及燃烧系统。     

基于ANSYS有限元法的5500mm四辊轧机牌坊分析

有限元分析是一种基于弹性力学的理论,用数值计算方法,描述实际物体某一方面属性及在一定的条件下它的内部状态的一种分析,在大密度网格划分的情况下其近似物体现实状态或过程的程度很高,有很重要的实践指导意义。针对5500mm轧机的牌坊运用ANSYS软件对它在最大载荷情况下的应力应变状况进行分析,对于合理利用轧机具有重要意义。结果表明,当轧机的轧制力运行在最大的100000kN的情况下,牌坊的强度足够。     

长江钢铁1250m~3高炉开炉及达产实践

针对长江钢铁1 250 m3高炉的开炉准备工作、开炉参数的选择、填充配料等方面的问题,对开炉及达产过程进行了分析总结。通过精细准备,合理控制操作参数以及调整后续过程,使得此次生产实践过程在工艺控制方面基本做到了平稳有序,实现了顺利开炉、快速达产的预定目标。     

中频炉炉胆的改造实践

分析了影响150kg中频炉炉衬使用寿命的主要因素,设计出带浇口的中频炉整体炉胆,并用于熔炼Sn、Cu、Ni、Ag等有色金属及合金.实践表明,带浇口的炉胆能增加中频炉开炉次数,延长炉衬寿命,提高生产效率,降低生产成本.     

大型预焙铝电解槽二次启动方法的实践

本文通过对大型预焙铝电解槽启动过程的介绍,并实践了与之匹配的内空外实装炉、快速降电压、低效应控制、快速形成炉膛的启动后期管理方法,取得了良好的效果。     

安钢3号高炉开炉达产生产实践

对安钢3号高炉开炉达产生产实践进行了总结分析。以快速均匀提高炉缸热量为基础，以安全顺利出好第一次铁水为关键，以合理安排炉料，控制煤气流分布为保证，以精心准备，稳步推进，项目管理为手段，实现了高炉开炉达产。     

Steady state creep behaviour of silicon carbide particulate reinforced aluminium composites

The roles of volume fraction and size of reinfrecement on the steady state creep behaviour of pure aluminium matrix-silicon carbide particulate composites have been studied in the temperature range 623–723 K. The observed apparent stress exponents are higher than 15 and apparent activation energy is 249 kJ mol⁻¹. By considering the existence of a threshold stress, the data for 1.7 μm particulate reinforced composites with different volume fraction can be rationalized according to the substructure invariant model. The effective stress-strain rate behaviour of composites with 10 vol.% of coarser particulates (14.5 and 45.9 μm), however, agree with the stress dependent substructure model. The present analysis is validated by constructing a new type of “dislocation creep mechanism map”. The observed threshold stress varies with the volume fraction of reinforcement and is independent of particulate sizes and test temperatures. It is suggested that a model based on applied stress independent load transfer is required to explain the origin of such a threshold stress.     

Elevated temperature compressive steady state deformation and failure in the oxide dispersion strengthened alloy MA 6000E

A study of the compressive flow strength-strain rate behavior of the oxide dispersion strengthened (ODS) alloy MA 6000E has been conducted between 1144 and 1366 K. Specimens taken in the longitudinal, long transverse, and short transverse bar directions were tested at strain rates ranging from 2.1 × 10⁻⁵ s⁻¹ to 2.1 × 10⁻⁷ s⁻¹. The inherent compressive strength of MA 6000E was essentially independent of orientation. Testing at the higher temperatures and slower strain rates produced large scale cracking. Such cracks formed and propagated in bands in which slip had dissolved and redistributed the γ’ precipitates. Steady state deformation could be described through use of a threshold stress model of creep where threshold stresses were calculated as functions of temperature and orientation from the relatively fast flow stress-strain rate data and the assumption that the effective stress exponent was 3.5.     

京唐2号高炉炉缸侧壁温度异常升高原因分析

炉缸的运行状况对高炉长寿起着决定性作用。首钢京唐2号高炉2017年8月开始炉缸侧壁温度急剧上升,对高炉的正常生产和人员安全提出了严峻考验。炉缸侧壁高温点的位置坐标表明,首钢京唐2号高炉炉缸侧壁温度异常升高的直接原因是炉缸内部铁水环流加剧对炉缸内衬的化学侵蚀和物理冲刷。进一步从铁水成分、炉底温度、铁口深度和铁水流速等因素分析,证实了2号高炉炉缸侧壁温度升高的根源在于炉缸活跃性恶化。此外,较高的硫负荷和焦炭灰分、较低的终渣碱度及水箱漏水等因素也在一定程度上促成了炉缸不活的状态。     

铜转炉吹炼炉口图像智能监测及辅助分析系统

传统转炉炼铜工艺非常依赖个人经验,一般通过人工观察炉口火焰判断炉体内温度、造渣和造铜终点,该过程存在重大的安全与环保隐患,同时粗铜的品位得不到保障且易损坏炉体。随着环保与本质化安全指标要求的提高,各家企业开始转向闭窗吹炼。为应对绿色化与安全性要求,本文基于转炉炉口火焰分析结果并综合吹炼工艺中涉及的多种因素,设计了一种转炉炉口图像智能监测系统,实现了转炉炉口火焰的智能化监测。在此基础上,通过对不同阶段炉口火焰图像的分析,设计了基于自适应曝光阈值的颜色特征计算方法,能够对图像进行预处理并提取到可预测终点时间的关键特征,解决了目前传感器曝光度参数影响图像特征的关键问题。最后设计了基于深度神经网络的终点时间预测模型,实验结果表明造渣一期、造渣二期和造铜期终点的预测误差分别为0.74, 0.83和1.4 min,显示了设计系统的有效性。     

新建高炉开炉操作中值得重视的问题

根据鞍钢新建高炉开炉操作经验,阐述了高炉全焦炭开炉、开炉总焦比、配料的渣碱度、取消空料段、开炉料总渣比等主要参数的确定,探讨了点火操作中第一次出铁时间的掌握、开炉煤气的回收、达产速度等问题。     

武钢1号高炉强化冶炼实践

对武钢1号高炉大修开炉以来的操作经验进行了总结.通过采取精料、优化装料制度、调整风口布局、完善高炉操作及加强管理等措施,高炉实现了强化冶炼,同时取得了较好的技术经济指标.