Hybrid Model of Molten Steel Temperature Prediction Based on Ladle Heat Status and Artificial Neural Network简

Aiming at the characteristics of the practical steelmaking process, a hybrid model based on ladle heat sta- tus and artificial neural network has been proposed to predict molten steel temperature. The hybrid model could over- come the difficulty of accurate prediction using a single mathematical model, and solve the problem of lacking the consideration of the influence of ladle heat status on the steel temperature in an intelligent model. By using the hybrid model method, forward and backward prediction models for molten steel temperature in steelmaking process are es- tablished and are used in a steelmaking plant. The forward model, starting from the end-point of BOF, predicts the temperature in argon-blowing station, starting temperature in LF, end temperature in LF and tundish temperature forwards, with the production process evolving. The backward model, starting from the required tundish tempera- ture, calculates target end temperature in LF, target starting temperature in LF, target temperature in argon-blo- wiag station and target BOF end-point temperature backwards. Actual application results show that the models have better prediction accuracy and are satisfying for the process of practical production.     

降低氧气放散率的研究和实施简

利用系统资源,根据邯钢铁钢生产以及制氧生产的现状,分析研究了降低氧气放散率的手段,解决了氧气放散率高的问题。     

高炉烘炉质量的研究简

 高炉烘炉质量直接影响高炉长寿,通过建立炉缸炉底砖衬传热模型,以1080m3高炉烘炉阶段炉缸炉底温度数据加以验证。分析了烘炉时间、烘炉温度、冷却强度等因素对冷却壁与炭砖间填料温度的影响。结果表明在0. 5m/s冷却水作用下,对于目前普遍采用的最高烘炉温度(600℃),填料最高温度仅为44℃,远低于要求的烘干温度,不能实现较好的烘炉效果。烘炉过程中需要减弱炉缸冷却甚至停水烘炉,适当提高烘炉温度,延长烘炉保温时间;停水烘炉时冷却壁最高温度仅为158℃,远低于铸铁冷却壁的安全工作温度。考虑到烘炉时热风的氧化性气氛,保证陶瓷质耐火材料严密覆盖在炉缸炉底炭砖表面,防止开炉前炭砖氧化烧损。通过插入冷却壁与填料交界面的热电偶温度分析炉缸砖衬的升温及保温,进而判断烘炉效果;并根据高炉固有的砖衬结构及设备参数,制定与高炉相匹配的烘炉制度。     

Mechanical Properties of Steels Treated by Q-P-T Process Incorporating Carbide-free-bainite/martensite Multiphase Microstructure简

Quenching partitioning tempering （QP-T） process were applied to a quenched carbide-free bainite/mar- tensite （CFB/M） multiphase steel 40Mn2Si2Cr and its effect on the mechanical properties was studied. The results showed that the partitioning time of Q P T treatment can he increased greatly to 90 min or even longer. The tensile strength, elongation and product of strength and elongation （PSE） of the experimental steel can achieve 1650 MPa, about 20% and over 33 GPa ·%, respectively. The significant increase of partitioning time and excellent mechanical properties could be related to the CFB microstrueture introduced in the quenching process during the Q-P-T treat- ment.     

市场导向添活力简

2013年12月5日,面向社会竞聘的云铜集团所属昆勘院院长赵志锐履新了。回忆一个月前5位昆勘院院长候选人竞聘面试的情景,员工评委周卫红露出了微笑：“通过竞聘的形式了解候选人对企业是否抱有长远打算,这点对企业对员工都非常重要。”     

Optimization of BF Slag for High Cr2O3 Vanadium-titanium Magnetite简

In order to clarify the slag system of high Cr2O3 vanadium-titanium magnetite smelting in BF （blast furnace）, the melting properties of slag samples prepared by analytically pure reagents were measured. By means of orthogonal test synthetic weighted score method, the optimal slag for high Cr2O3 vanadium-titanium magnetite was obtained, which contained 10% MgO, 8% TiO2 and 15% Al2O3, with the binary basicity being 1.15. In addition, the effects of basicity, MgO, TiO2 and A12 03 on slag melting properties were investigated by single factor test, and the results showed that, with increasing the basicity or TiO2 content, melting temperature （Tin） increased, whereas initial vis- cosity （r/0） and high temperature viscosity （r/h） decreased. With increasing the MgO content, Tm decreased firstly and then increased. With increasing the Al2 O3 content, Tm increased, and η0 and r/h decreased firstly and then increased.     

楚歌掠过电解槽简

亲，您有这种感觉吗？高兴时，年轻人都会聚在一起，喝点小酒，再去K歌，几首跑调的歌吼下来，满头大汗，压力很快得到释放。然而今天，我却想带着大家去听一组悲情的歌。听完之后，身处行业内外的亲们，     

Hot Deformation Behavior of Ni3Al-based Alloy MX246A简

The hot deformation behavior of homogenized Nia Al-based alloy MX246A has been characterized on the basis of its flow stress variation obtained by isothermal constant true strain rate compression testing on the MTS 810 machine in the temperature range of 1 150--1225 ℃ and strain rate range of 0. 001-0.1 s-1. Microstructural obser- vation revealed striped secondary γ＇ phase which was vertical to compression axis, and precipitation of fine ternary γ＂ phase. The amount of striped secondary γ＇ phase reduced and that of fine ternary γ＇ phase increased with increasing temperature and decreasing strain rate. The material exhibited peak stress followed by flow softening, but no obvious steady-state flow behavior. Microstructural investigations have shown no dynamic recrystallization happened. TEM studies indicated that the flow softening was controUed by dynamic recovery mechanism.     

Microstructures and Mechanical Properties of X100 Pipeline Steel Strip简

Dynamic CCT （continuous cooling transformation） curves and effects of microstructures and M/A islands of X100 hot rolled strip on mechanical properties were studied by means of a thermal simulator, a scanning electron mi- croscope （SEM）, a transmission electron microscope （TEM）, a digital micro-hardness tester and Image-Pro Plus analysis software. The results show that high contents of C and Mo can make transformation lines of acicular ferrite and bain- ite shift rightward. High Mo tested strip has higher strength and micro-hardness and lower toughness than the other one because lath bainite appears instead of quasi-polygonal ferrite. Tested strip with granular bainite, lath bainite and M/A islands has better mechanical properties and in the microstructures lath bainite content is around 36.50% and M/A islands are fine and disperse in the matrix.     

收储主导钨市场行情简

回顾2013年,受国家储备局收储钨精矿影响,钨市场波动剧烈。钨矿山和冶炼厂冰火两重天,矿山盈利,而冶炼厂艰难维持,多数企业亏损,被迫停产。展望2014年,预计供应仍将维持稳定,但由于2013年底积攒大量库存,市场很难大幅改善。     

Pulverized Coal Combustion of Nitrogen Free Blast Furnace

 The efficiency of coal combustion is an important factor for the blast furnace process. The influence of low xO/xC on coal combustion performance under nitrogen free blast furnace condition was researched through the self-developed pulverized coal burning device. The results show that the coal combustion rate reduces with xO/xC decreasing, and the combustion rate of bituminous coal is higher than that of anthracite. The coal combustion rate ascends with the rise of volatile matter, but when volatile matter of pulverized coal is more than 18%, the combustion rates will not increase correspondingly. Small amount of CaCO3 and CO2 additions can promote coal combustion, and the effect of CaCO3 is more apparent, which can increase the pulverized coal combustion rate by 15%-18% or so.     

高炉数学模型的进展

高炉是一个复杂的气固向流反应器。为了理解、控制和改进高炉炼铁过程，更多的努力被用于开发数学模型。全高炉动力学模型经历了从一维到多维、稳态到非稳态、简单到复杂的发展过程。多流体高炉模型是全高炉动力学数学模型研究的最新成果之一。该模型基于多流体理论，可对炉内主要现象进行多维数学模拟，并能精确地预测高炉在指定条件下的操作指标。未来的高炉数学模型应朝复杂化和实用化方向发展，并拓展解析范围、提高模拟精度。     

高炉操作参数优化数学模型

采用数学规划论和最优化方法，建立高炉操作参数优化数学模型。通过对某钢厂实际生产数据的统计分析，得到了焦比，焦炭负荷，高炉利用系数等参数的多元线性回归方程，并通过计算标准回归系数确定各因素对目标函数值的影响程度和自变量与因变量的正、负相关性，调整主要参数，使目标函数接近或达到最优值。     

高炉应用数学模型研究

根据高炉冶炼理论，结合具体检测条件，建立高炉无料钟布料和软熔带应用数学模型。在实践中，应用该数学模型寻求高炉生产与布料及软熔带特性等关系，便于分析指导控制生产。     

Improvements on Calculation Model of Theoretical Combustion Temperature in a Blast Furnace

 On the basis of the existing originally modified calculation models of theoretical combustion temperature (TCT), some factors, such as the combustion ratio of pulverized coal injection (PCI), the decomposition heat of PCI and the heat consumption of SiO2 in ash reduced in high temperature environment, were amended and improved to put forward a more comprehensive model for calculating TCT. The influences of each improvement on TCT were studied and the results were analyzed compared with those of traditional model and originally modified model, which showed that the present model could reflect the thermal state of a hearth more effectively.     

高炉炼铁过程数学模拟的研究进展

 高炉是最复杂的冶金反应器之一。为了更好地理解、优化和智能控制高炉炼铁过程,人们开发出大量的高炉数学模型。回顾了全高炉反应动力学数学模型的发展历程,重点介绍了典型研究成果——多流体高炉数学模型的创建实例及其应用;概述了国内外高炉智能专家系统的开发和应用情况;对高炉数学模型的未来发展做出了若干展望,指出CFD-DEM高炉模型、全高炉综合数学模型和专家系统的有机结合是未来高炉过程数字化和控制的发展方向。     

高炉优化配料数学模型的研究

为了研究实用的高炉优化配料数学模型,利用线性规划原理,以高炉炼铁工艺计算为基础,结合各种含铁炉料的软熔性能和含铁炉料之间的高温反应性等专家知识,开发了一套基于专家知识的高炉优化配料数学模型,并应用生产高炉现场数据对模型进行了验证.结果表明该模型是合理可行的,能够计算得出同时兼顾炉料冶金性能和配料成本的高炉炉料结构.     

Mathematical Modeling and Exergy Analysis of Blast Furnace Operation With Natural Gas Injection

Blast furnace operation with natural gas (NG) injection is one of the effective measures to save energy, reduce CO₂ emission, and decrease environmental load for iron and steel industry. Numerical simulations on blast furnace operation with NG injection through tuyeres are performed in this paper by raceway mathematical model, multi‐fluid blast furnace model, and exergy analytical model. With increasing NG injection volume, the simulation results are shown as follows: (1) the theoretical flame temperature and bosh gas volume can be constant by decreasing blast volume and increasing oxygen enrichment. (2) The utilization rate of CO enhances while that of H₂ decreases. The proportion of H₂ in indirect reduction tends to be increased, which accelerates the reduction of burdens. The pressure drop shows that the permeability of blast furnace gets better. The blast furnace productivity is increased from 2.07 to 3.08 t · m^?3 · day^?1. The silicon content in hot metal is decreased from 0.26% to 0.05%. When BF operation with 125.4 kg · tHM^?1 NG injection, coke rate and carbon emission rate are decreased by 27.2% and 32.2%, respectively. (3) The thermodynamic perfection degree is increased from 88.40% to 90.50%, the exergy efficiency is decreased from 51.94% to 49.02% and the chemical exergy of top gas is increased from 4.69 to 6.22 GJ · tHM^?1. It is important to strengthen the recycling of top gas.