连铸坯热装炉改善钢的组织性能

连铸坯热装炉改善钢的组织性能鞠幼华鞍钢钢研所我国连铸工业的发展与国际发达国家有许多不同之处，随着连铸坯短流程直送热装工艺的推广应用与连铸连轧新工艺的开发，将形成连铸坯冷装、温装、热装、在线补热直接轧制和薄板坯连铸连轧等多种工艺。装炉坯温（表面形心温度...     

热送热装工艺中板坯出连铸机温度的分析

用连铸坯凝固过程传热模型模拟了热送热装工艺中不同工况下铸坯凝固壳厚度和铸坏出连铸机的温度变化。模拟结果与实测值吻合很好。影响铸坯出连铸机温度的主要因素是铸坯尺寸、连铸机拉速和冷却制度。     

连铸坯热装加热工艺初步研究

从连铸坯热装和冷装的加热目的、装炉温度及金属学行为差异的角度,提出了制订连铸坯热装加热工艺的基本原则以发挥连铸坯热装潜在的燃耗低、烧损少、产量高的经济效益。     

热送热装工艺中板坯出连铸机温度的分折

用连铸坯凝固过程传热模型模拟了热送热装工艺中不同工况下铸坯凝固壳厚度和铸坯出连铸机的温度变化。模拟结果与实测值吻合很好。影响铸坯出连铸机温度的主要因素是铸坯尺寸、连铸机拉迪和冷却制度。适当提高拉速及改善连铸机二冷区冷却制度有利于高温铸坯的生产。     

超宽板坯热装直送工艺实践研究

中厚板坯热装直送工艺可大幅度降低加热炉能耗，降低钢材生产成本。南钢超宽板坯因宽厚比大，极易产生纵向裂纹，南钢板材铸机表面纵向裂纹发生率高，且超宽板坯因铸坯平整度差去毛刺困难，且在热装直送过程中因两相区温度区间入炉，导致钢板表面产生了热装裂纹，因此宽板坯纵向裂纹、去毛刺和热装裂纹问题成为南钢板材铸机实现流程优化、铸坯热装直送和节能降耗的关键问题。详细描述了南钢超宽板坯铸机热装直送工艺实践过程，优化铸机去毛刺工艺，并对产生的板坯纵向裂纹和钢板表面热装裂纹产生原因进行分析，优化影响板坯表面纵向裂纹连铸生产工艺制度，同时根据钢种成分特点，调整优化不同钢种成分钢种坯料堆冷时间和控制入炉温度，避开热装裂纹敏感温度区，避免了热装裂纹，实现了超宽板坯热装直送工艺，降低了轧钢加热炉生产能耗。     

广西钢铁双流板坯提高铸坯热送率生产实践

<正>随着连铸、铸坯无缺陷技术的突破，以及热连轧工艺装备的发展，通过充分利用连铸坯白身温度，采用“热送热装”轧制技术，已成为钢铁生产节能降耗的发展方向。采用热送直轧工艺能简化生产工艺流程，缩短物流周期，提高加热炉和轧机的生产能力，减少烧损，大幅度节省能耗，提高成材率和生产效率，降低劳动强度。广西钢铁集团双流板坯连铸机于2020年投产，由于投产初期设备精度欠佳、工艺尚不成熟，加之生产组织及管理制度不完善等，导致铸坯热送率较低。集团通过不断提高设备精度、优化生产工艺，保证铸坯质量及优化生产组织，大幅提高了铸坯热送率、降低了加热炉煤气消耗，实现了节约能源低碳生产，取得了显著的经济效益。     

中厚板厂热送热装试验研究

某中厚板厂进行了为期半年的技术改造,改造完毕后具备了实施热送热装生产的基础条件,并进行了热送热装生产试验,取得了良好的节能降耗效果.对本次试验情况进行了介绍,并对中厚板厂后续热送热装工作进行了展望.     

提高铸坯热送热装率的实践

文章介绍实施的优化炼钢、轧钢计划排程,降低各铸坯库库存量并维持动态平衡,铁、钢、材协同检修、生产,柔性轧制攻关,应用倒角结晶器等管理与技术革新措施。结果表明,柳钢铸坯热送热装率从2018年的91.56%、74.92%稳步提高到2021年的94.52%、78.16%。     

利用旋转坐椅施行经皮肺穿术

连铸坯的热送热装是目前国内外正在研究的重要课题之一，减少连铸坯在辊道输送过程中的温降是提高热装温度的重要途径。本文根据板坯在输送过程中的散热二维数学模型，分别研究了辊道上部加保温罩和不加保温罩两种情况下对板坯温降的影响，经现场测试验证，所建模型可用，计算结果可供现场生产参考。     

裂纹敏感钢种热送热装技术综述

简要介绍了热送热装过程中容易发生裂纹的敏感钢种,分析了热送裂纹产生的原因及机理,并探讨了目前在热送裂纹预防方面采取的措施。     

Unerroric of control of mutual compliance of the efficiency of hydrogen engines of unmanned vehicles in the conditions of mass production

The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO₂ and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized.     

Review of theory of distortion and disintegration of liquid streams

Linear and nonlinear analyses of the instabilities and distortion of liquid streams injected into a gaseous media are discussed. The various fundamental mechanisms and the predictive capabilities for the distortions are emphasized. Round jets, planar sheets, annular sheets, and conical sheets are discussed in detail. The balance between capillary and inertial forces is primarily examined. The method for simplifying the analyses in the case of thin liquid sheets is discussed. The capabilities for representing the droplet size distribution that follows the stream disintegration are outlined.     

机车车轮多轴疲劳强度安全评定的研究

使用ANSYS8.0软件对高速列车车轮进行了三维有限元分析,计算出车轮在直线、曲线和道岔条件下牵引、制动共6种工况时孔边薄弱部位的应力,分别通过Mises等效平均应力方法、Sines平均主应力方法和应力分量中考虑平均应力方法计算出应力在极值位置时的等效应力幅、等效平均应力,从而进一步算出车轮的安全系数,对其疲劳强度进行评定,并对3种方法进行了比较研究。     

固体热辐射Yong性能分析

本文对漫灰均温物体在常物性条件下对外辐射传热的Ｙｏｎｇ值计算建立了数学模型。通过与物体内能Ｙｏｎｇ公式的数值计算比较,得出了辐射能量的Ｙｏｎｇ值不大于内能Ｙｏｎｇ值的结论。从初步的热射Ｙｏｎｇ值计算公式发现。Ｙｏｎｇ与物体表面辐射率有关。     

中国煤炭地下气化技术的发展

本文综述了煤炭地下汽化技术的国内外发展现状,对我国“长通道、大断面”煤炭地下气化新工艺给予了技术经济评述,并提出了发展煤炭地下汽化技术的政策建议。     

Measurements of concentration distribution of hydrogen jet using deflection of center of the laser spot

The main purpose of this work is to propose a new method to evaluate the concentration distribution of the hydrogen jet by using a He–Ne laser through the jet. This research attempts to apply the expression of concentration Gaussian distribution, the refraction formula of inhomogeneous refractive index medium, and the concentration inversion function to disclose the displacement of the center of the laser spot at different heights in the gas jet. The spot images of the laser beam passing through the gas jet at three vertical heights z = 10d, 20d, 30d, and different radial positions are obtained. The radial spatial asymmetry of the gas jet is also found in the experiment. Finally, the calculated concentration distribution curve and the fluent simulation curve, it is found that the two results are very similar. Our findings show that the error between the concentration distribution of this method and the simulated concentration distribution reaches 2.43%.     

黄壁庄水库副坝塌陷机理分析

为了调查黄壁庄水库副坝频发塌陷事故的原因,从防渗墙槽壁稳定性角度研究了槽壁稳定性与护壁泥浆重度之间的关系,分析了第六次塌陷前的测试试验结果,并在多种因素共同作用下分析了黄壁庄水库副坝的塌陷机理。结果表明,由于护壁泥浆重度小于设计临界重度,使得槽壁失稳;同时泥浆水渗透到周围非饱和土层,引起土层地下水位上升,尤其是坝基下面的粉土层,在冲击成槽的施工振动、地下水位上升、含水率增加等多种因素的作用下逐渐液化,从而造成承载力降低;另外由于事先未发现基岩中存在溶洞,当成槽钻孔揭穿溶洞时,槽体内的护壁泥浆迅速下沉,槽壁的稳定急剧破坏,致使槽壁完全塌陷。     

汽轮机零件防锈性能的改善

介绍了汽轮机零件的封存特点、防锈要求及防锈油性能对比试验的方法,通过对试验结果的对比分析,客观验证了各种防锈油的性能。试验表明,只有选择了合适的防锈油,才能保证汽轮机零件长期封存的质量。     

湖泊岸边红壤土渗流对杆塔接地电阻的影响

为研究湖泊水分渗透对红壤土区的杆塔接地装置电阻的影响,采用有限元法结合试验研究了红壤土电阻率与饱和度的关系及水分渗透过程,在CDEGS中构建接地装置模型,提出水分影响系数的概念,计算渗透存在对湖泊周边杆塔接地装置接地电阻的影响。结果表明,红壤土电阻率对水分十分敏感,渗透会改变土壤饱和度的分布,引起土壤电阻率降低,使接地电阻下降;离湖泊越远,杆塔接地电阻越大,水分影响系数越大,水分影响系数呈缓慢-迅速-缓慢的上升趋势。     

地震动峰值速度对小湾拱坝动力响应的影响分析

为了探究地震动峰值速度对拱坝的影响,采用大型有限元分析软件ABAQUS建立了小湾特高拱坝三维有限元模型,考虑地基-坝体-库水相互作用,计算正常蓄水位温降工况下坝体各向位移和应力的最大值及其最大增幅.结果 表明,随着峰值速度增幅的增加,坝体最大第一、三主应力的增幅及坝体各向位移均随之增加,坝体最大第三主应力的增幅增加较快...