Explicit Dynamic FEM Analysis of Multipass Vertical-Horizontal Rolling

Three passes of plate rolling during vertical-horizontal rolling process are simulated with explicit dynamic finite element method and updating geometric method. The equivalent strain and stress fields, and shape change at the head and tail of slab during rolling are obtained. The calculated result of the shape at the head and tail of slab is in good agreement with the measured one. The explicit dynamic finite element method and updating geometric method can be used effectively to analyze the multipass vertical-horizontal （V-H） rolling process.     

Optimization of Holding Temperature and Holding Thickness for Controlled Rolling on Plate Mill

Holding temperature and holding thickness are main parameters for two-phase controlled rolling on plate mill. The optimization of holding temperature and holding thickness for pass schedule calculation of two-phase controlled rolling on plate mill was presented and its feature is as follows： （1） Determination of holding thickness can be automatically obtained based on the influence of mill safety limits, tracking zone length and holding time on holding thickness; （2） Determination of holding temperature can be automatically obtained and the holding time can be reduced as much as possible; （3） Algorithm can modify the holding temperature and thickness depending on slab size and product size.     

Heat Saturation Time of Solid Spherical Regenerator of HTAC

In order to control the heat saturation time, the temperature field of the regenerators of high temperature air combustion （HTAC） technology after reheating furnace was studied. A one-dimensional unsteady mathematical model was established and discretized through finite difference method. The relationship between the heat saturation time and some factors was determined through the calculation of a program developed by language C. The heat saturation time decreases with the increase of heat convection coefficient, however, the increase of heat capacity, density and radius of regenerator all increase the heat saturation time approximately linearly.     

潜热型功能热流体的制备及其传热和流动特性研究进展

介绍了我们近年来对潜热型功能热流体制备、流动和强化换热特性的研究.潜热型功能热流体换热能力比普通流体强,其强化换热的物理机制为:相变颗粒为分布内热源或热汇,相变颗粒的存在改变了流体的温度分布;自研潜热型功能热流体可看成牛顿流体,摩擦阻力系数符合64/Re关系,粘度约是水的5.57倍,优于国内外文献中报道的同类材料的粘度.由于存在相变,相同换热量下泵耗比水小,实际应用的经济性和可行性较好.     

The Invalidation Analysis of a Working 5 CrMnMo Forging Die and Ways of Precaution

The paper introduced the 5 CrMnMo steel, including the chemical composition, the heat treatment technology, the forging die working condition, and the invalidation form （such as the cavity arris wear, the cavity subsidence, the cold and the heat fatigue crackle）. Then gave some precautions for prolonging the mould life by improving the heat treatment technology.     

固体热容激光器的设计和功率标定

固体热容激光器（SSHCL）作为下一代最佳候选高功率激光器,引起人们广泛关注。介绍了固体热容激光器工作原理、光抽运期间介质板内荧光分布和温度分布、介质板冷却以及功率标定。详细讨论了激光介质温度对激光输出功率的影响,对有关设计要点也作了相关分析。     

燃气热泵系统在过渡季节制备生活热水的性能研究

研究了燃气热泵(GHP)系统在过渡季节制备生活热水的性能特性,分析了发动机余热回收对GHP系统性能的影响。在不同环境温度(15～24℃)和进水温度(37.7～47.8℃)下,考察回收与不回收发动机余热模式对生活热水制热量■、耗气功率(P_gas)及一次能源利用率(r_PER)的影响规律。结果表明,随着环境温度的升高,P_gas减小,而■和r_{PE R}呈现递增的趋势;随着进水温度的升高,Pgas增大,而■和r_PER呈现递减的趋势。其中环境温度20～24℃与进水温度37.7～47.8℃为Q_h的不敏感区间,在环境温度为24℃和进水温度为37.7℃条件下,r_PER高达2.004。GHP系统的余热回收量分别占总制热量和发动机总余热的25.00%～30.16%和62.17%～71.56%,系统的余热利用率高。     

汽轮机低真空运行循环水供热技术应用

本文介绍了汽轮机低真空运行循环水供热技术在C12-35/10机组上的应用,并结合工程实例,对低真空运行循环水供热的经济性和安全性进行了分析、探讨。     

分离式热管煤气、空气双预热器在上海宝钢4#高炉热风炉上的应用

本文介绍了分离式热管煤气、空气双预热器在上海宝钢4#高炉热风炉上的实际应用情况,通过换热器将煤气和空气预热来提高热风炉风温,从而提高高炉冶炼的经济效益。文章从技术、节能以及经济效益三方面详细分析其优越性。     

循环流化床稀相区对流换热的理论分析和实验研究

对循环流化床上部稀相区气固混合物横掠圆管的对流换热研究,多数是针对鼓泡床的研究,而对循环流化床上部稀相区的对流换热研究目前还很少。本文对稀相含尘气流横向冲刷圆管的对流换热进行了研究,并在理论分析的基础上,在热态循环流化床实验台的上部稀相区进行了实验。采用平均粒径分别为137μm,146μm和326μm的石英砂为床料。实验结果表明,稀相含尘气流与纯空气横掠圆管时的对流换热系数之比hd/hg主要受稀相含尘气流密度和颗粒粒径的影响,通过理论分析和实验数据的拟合,得到稀相含尘气流横掠圆管的准则方程。研究基于热态实验,结果更接近于实际工况,可为循环流化床的设计提供理论依据。