悬臂筛网振动筛在烧结成品整粒系统中的应用

莱钢烧结成品整粒系统的三次筛分和四次筛分，一直用直线振动筛。随着烧结矿产量的增加，原直线振动筛因其处理能力低、筛分效率低、运行成本高等已不能满足生产要求。悬臂筛网振动筛具有动态筛孔，且可使物料充分接触筛面，体积小、耗能低、筛粉效率高，经现场适应性改造代替了原直线振动筛。应用表明，筛分指数由8％降低到了6％，满足了生产工艺要求，年效益为1394万元。     

盘条和钢丝国际标准现状及我国标准与国际标准接轨的思考

综述了ISO TC17 SC17秘书处制定的最新盘条和钢丝国际标准的内容和特点 ,提出我国盘条和钢丝国家标准与国际标准接轨的“双向原则”及具体实施方法。     

唐钢大盘重碳素焊条钢热轧盘条的研制

介绍唐钢大盘重碳素焊条钢热轧盘条的研制及生产情况。针对该钢种化学成分及力学性能进行了统计、回归分析 ,并对化学成分进行优化     

Effect of Rare Earth Element Ce on Microstructure and Properties of Aluminum Rod for Electrical Purpose

The effect of rare earth element Ce on microstructure, electrical conductivity and mechanical properties was studied.Using optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffractometer, the microstructure and phase composition of aluminum rod for electrical purpose were measured and analyzed.The results indicate that rare earth element Ce can considerably refine grain size of aluminum rod for electrical purpose,improve the regular distribution pattern of the impurity, such as silicon and iron which present in the aluminum matrix,form stable metal compound with pernicious impurity.This metal compound precipitates on the crystal boundary.As a result, the solid solubility of impurity in aluminum reduce, and the electrical conductivity of aluminum rod for electrical purpose is improved.It is found that the mechanical properties of aluminum rod for electrical purpose are improved by rare earth element in certain range of RE addition.     

Analysis of NEA C5MOX benchmark with computer code “cohint” based on interface current approach

Interface current approach to solution of neutron transport equation has been earlier used for LWR lattice problems. The analysis of the C5MOX benchmark is a opportunity to test its applicability to heterogeneous reactor problem. Computer code COHINT, which incorporates a routine for solution of neutron transport equation in X-Y geometry by interface current approach was used for this analysis by representing the fuel rod as a square one. Region interface angular fluxes are represented by a four-term expansion. It is found that the average pin power error is about 2.28 % (peak pin error 4.1 %) relative to reference calculations. Further improvement is possible by introduction of the capability to represent circular rods with in a square cell in COHINT.     

发动机连杆裂解加工初始裂纹槽几何参数研究

分析比较了裂纹槽的设计位置、几何形状以及预制方法;对含有预制裂纹槽的C70S6钢连杆的裂解加工过程进行了数值模拟分析和连杆断裂剖分实验,给出裂纹槽几何参数对裂解力水平的影响规律.结果表明,在其他参数不变的条件下,裂纹槽深度对裂解力的影响最为显著,随着槽深增大裂解力锐减;提高锐度及减小张角可降低裂解力,但曲率半径为0.1~0.3 mm或张角>30°时,裂解力增幅较小且趋于稳定.研究结果对合理设计裂纹槽、降低切槽成本、提高连杆裂解质量具有参考价值.     

池式核沸腾中滑移汽泡的薄层蒸发传热模型

通过对池式核沸腾下加热壁面上滑移汽泡引起的薄层蒸发传热的分析,在若干假定基础上,建立了滑移汽泡薄层蒸发传热模型,并在该传热模型的基础上,结合管束沸腾传热机理的实验研究结果,给出了管束沸腾传热的薄层蒸发传热增强贡献的分析表达式,验证结果表明,采用建立模型计算所得单管池沸腾传热系数与实验结果的平均相对误差为±６．１％。     

RH真空室烘烤装置的改进

原 RH真空室烘烤装置升降小车采用齿轮齿条传动方式或链轮链条传动方式 ,都曾多次发生事故 ,改用液压推杆——链条传动方式后使用效果很好。     

安钢高速线材轧机工艺设计特点

介绍了安阳钢铁集团公司高速线材轧机及其工艺特点。     

2×2稠密棒束内超临界水的传热特性试验研究

在压力p=23～28 MPa、质量流速G=350～1 000 kg/(m²•s)、热流密度q=200～1000 kW/m²的试验参数范围内,对2×2棒束内超临界水的传热特性进行了试验研究。试验得到了加热管周向壁温分布规律,并就出现周向温度差异的原因进行了分析。此外,给出了压力、质量流速及热流密度等系统参数对平均传热特性的影响,分析了低质量流速下出现的传热恶化现象。试验结果表明：加热管周向壁温并不均匀,边角子通道壁温最高,中心子通道壁温最低,周向壁温的高低与横截面流通面积的不均匀性紧密相关。随着热流密度的提高或质量流速的降低,超临界水的传热受到抑制,当q/G增大到一定程度时,棒束内发生传热恶化。