“一包到底”大容量铁水车的研制情况

标准轨距大容量铁水车是“一包到底”铁水运输工艺方案必需的运输设备,其运行安全及稳定性是人们普遍担心的问题。本文介绍了大容量铁水车设计的难点和针对首钢搬迁曹妃甸工程项目设计研制大容量铁水车的情况。     

工业CR技术最新动态

概述工业计算机射线照相(CR)技术的最新进展,包括CR成像板荧光体结构的改进,信噪比和分辨率的提高,激光扫描器的多成像板同时输入、扫描和数字图像输出,使得对射线照相质量和灵敏度有较高要求、且对检测速度和周期也要兼顾的承压设备焊缝检测,有了稳定可靠的新基础。EN和ASME有关CR标准的推出,又为焊缝实施CR检测提供了法定技术依据。本文旨在为国内承压设备加速推广应用CR检测起推波助澜作用。     

凝汽器管板和水室的防腐

根据凝汽器水室和管板的腐蚀机理,提出用环氧煤沥青做防腐涂层。本文介绍了环氧煤沥青的主要成分、性能以及凝汽器用环氧煤沥青防腐的施工工艺及涂层质量的检测方法等。     

Corrosion behavior and electrical conductivity of niobium implanted 316L stainless steel used as bipolar plates in polymer electrolyte membrane fuel cells

The corrosion behavior and interfacial contact resistance (ICR) of niobium implanted SS316L used as the bipolar plate in a polymer electrolyte membrane fuel cell (PEMFC) are investigated. The ICR values of the bare and niobium implanted SS316L are measured to evaluate the electrical conductivity. The effects of ion implantation on the corrosion behavior are investigated by potentiodynamic and potentiostatic tests in the simulated PEMFC anode and cathode environments. The solutions after the potentiostatic test are analyzed by inductively-coupled plasma atomic emission spectrometry (ICP-AES). The surface topography of the samples before and after the potentiostatic test is monitored by SEM in order to investigate the mechanism and degree of corrosion. The XPS results indicate that the composition on the surface is altered by ion implantation. The electrochemical results reveal that the passivation current density of the Nb implanted SS316L decreases and has higher chemical stability in the simulated PEMFC environment. However, the ion implantation fluence affects the current density. The ICP results are in agreement with those of the electrochemical test disclosing that the bare SS316L has the highest dissolution rate in both the cathode and anode environments and niobium implantation reduces the dissolution rate significantly. SEM shows that the bare SS316L undergoes serious corrosion whereas after Nb ion implantation, corrosion is greatly retarded. The XPS depth profiles indicate that a passive film with a new composition consisting mainly of niobium oxide is formed after the potentiostatic test. Our results suggest that niobium implantation with proper ion fluences can significantly improve the corrosion resistance and the electric conductivity of SS316L in the simulated PEMFC environments.     

Laboratory development of high performance steel plates with excellent HAZ toughness at large heat inputs

Presented in this study is the result of steel plates developed at laboratory by using the technique of chemistry design based on microstructure evolution.It has been shown that the produced 50mm thickness steel plates with yield and tensile strength being 420 MPa and 530 MPa respectively exhibit excellent large heat input weldability:the Charpy impact tests in the whole range of heat affected zone(HAZ) including the fusion line at the welded joint with large heat input of 100 -300 kJ/cm showed uniform impact toughness of above 140 J at -40℃.Welding simulations were also performed for heat inputs of 200-600 kJ/cm,which showed far better toughness at -20℃.Analysis on the results of the simulations and the practical welding tests were done and the microstructure evolution mechanisms were proposed.Finally suggestions were given to improve the simulation processes as well as chemistry modification.     

矿用梭车电气系统设计

介绍了以1140 V交流电为动力的矿用梭车电气系统的设计.梭车电气系统包括供电系统、整车控制系统、变频调速系统、显示系统.整车采用CAN总线的通讯方式对车辆进行控制,并实时监控车辆的运行状态,显示车辆的各项运行参数.整车具有自动化程度高、性能安全可靠等优点,并且实现了零排放.     

大屯矿区井下辅助运输系统改造设计

为了提高大屯矿区井下辅助运输系统的运输效率,合理解决采区运人问题,结合矿井的实际条件,对采区辅助运输系统提出了"无极绳绞车牵引+卡轨车系统"、"柴油机齿轨车+卡轨车系统"2种改造方案,并进行比较和优选。改造方案对类似矿井辅助运输系统具有一定的指导意义。     

Cr and Zr/Cr nitride CAE-PVD coated aluminum bipolar plates for polymer electrolyte membrane fuel cells

In this work, two nitride coatings deposited on aluminum-based bipolar plates via cathodic arc evaporation physical vapor deposition (CAE-PVD) have been evaluated using two different techniques. The coating materials, a multi-layer chromium-zirconium nitride (ZrN–CrN) and a monolayer chromium nitride (CrN) have been exposed to electrochemical polarization tests for corrosion resistance simulating the typical environment in the anode and cathode sides in polymer electrolyte membrane fuel cells (PEMFC). Besides, two 3-cell PEMFC stacks, one per each coating material, have been formed. The migration of metal cations toward both the gas diffusion layers (GDL) and catalyst layers have been analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), after 100 h of continuous operation of the stacks. Results have shown that the two coatings applied over the Al-plates satisfy the corrosion resistance requirements in the short-term tests performed at the two stacks. Moreover, results obtained from electrochemical polarization tests have revealed that the CrN-coating confers a good corrosion resistance to the Al-based metal plate, achieving values of corrosion potential and corrosion current two orders of magnitude lower than the ones obtained for the Al alloy as-received.     

电动汽车BMS测试系统的数据通信

随着新能源汽车产业的发展,车载动力电池管理系统（BMS）的可靠性是直接影响电动汽车可靠运营的关键因素之一。为此开发一套BMS测试系统,实现对车载主从分布式BMS信息的监控及系统测试功能,为BMS的测试及故障诊断提供便捷的途径。此测试系统是上位机与BMS通过CAN通信进行信息交互,达到测试及监控的目的。本文重点描述BMS测试系统的上位机与BMS控制器CAN数据通信的实现过程及方法。     

基于效率最优的混联式混合动力驱动系统转矩分配研究

针对一款混联式混合动力汽车,以总体效率最高为目标,用等效BSFC的方法,对发动机和电机间的转矩及2个电机间的转矩进行了分配,得到了发动机、ISG电机和TM电机的转矩分配图。在MATLAB/Simulink环境下建立了混合动力系统控制策略,进行了仿真分析,并把控制策略转换成C代码导入控制器,进行实车测试。仿真和测试结果表明,该控制策略能满足驾驶员需求,实现各动力源间转矩的合理分配,达到节省燃油的目的。