炉底修复技术在1650m3高炉上的开发与应用

太钢1650m3高炉大修投产2年零4个月后,炉缸、炉底温度持续升高,采取降低冶炼强度,提高钒钛矿配比、限产、增大冷却水量、降低冷却水水温等措施后,炉缸、炉底温度的上升仍未得到根本控制,遂采取在炉缸、炉底增装冷却装置措施,炉缸、炉底温度才趋于稳定.     

An Alternative Technique for the Extraction of Valuable Elements from Fly Ash: the Carbochlorination Method

Russian Journal of Non-Ferrous Metals - The extraction of valuable elements from high-alumina fly ash was carried out using two methods, the carbochlorination method and the carbothermic method....     

级联H桥光伏逆变器开关管开路故障诊断

多电平逆变器包含大量的半导体开关,以级联H桥光伏逆变器为例,针对开关管开路故障提出一种快速故障诊断和处理方法。在载波的顶端或底端采样每个H桥模块的输出电压,将其作为判断开关管开路故障的判据。诊断完成后,采取相应的措施降低故障程度。该方法可在一个载波周期内完成故障开关管的精确定位。实验结果验证了该方法的有效性。     

掘进机截割头钻速优化分析

文章基于EBZ120型悬臂式掘进机进行截割临界转速分析优化,通过利用微元法和弹性力学建立力学模型,确定临界状态下,截割头转速解析解,然后深入分析影响截割转速的因素,依据影响程序确定影响介个转速的因素次序,为截割临界转速的确定提供实际操作提供依据。     

Influence of silver on electrochemical and corrosion behaviours of Pb–Ca–Sn–Al grid alloys Part II: A.c. impedance and scanning electron microscopy studies

The influence of silver, in the range of 0.02 to 0.07wt%, on the electrochemical and corrosion properties of Pb–Ca–Sn–Al grid alloy in sulphuric acid solutions at room temperature was investigated by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). EIS was used to study the effect of silver on the surface layer(s) of an electrode under different conditions, while the oxide layers produced on the working electrode surface were examined by SEM. The addition of silver in the alloy inhibits the reactions of Pb to PbSO4 and PbSO4 to PbO2 and produces a more dense oxide layer which could enhance the corrosion resistance of the alloy.     

MgO－Al_2O_3－ZrO_2质耐火材料的显微结构分析

在方镁石－尖晶石－ＺｒＯ２－硅酸盐相结构中，发现由于ＺｒＯ２的存在，可提高主晶相方镁石与尖晶石的结构完整性。同时ＺｒＯ２又吸收并富集了大量的ＣａＯ成分，形成ＣａＺｒＯ３布于晶间，阻断硅酸盐相的扩散路径，封闭气孔．并有形成原位生长的含有ＣａＯ·ＺｒＯ２高粘弹基质相的趋势，在遇渣侵蚀时这种现象更为明显。     

Chemical looping glycerol reforming for hydrogen production by Ni@ZrO2 nanocomposite oxygen carriers

The research describes the synthesis of nanocomposite Ni@ZrO₂ oxygen carriers (OCs) and lanthanide doping effect on maintaining the platelet-structure of the nanocomposite OCs. The prepared OCs were tested in chemical looping reforming of glycerol (CLR) process and sorption enhanced chemical looping reforming of glycerol (SE-CLR) process. A series of characterization techniques including N₂ adsorption-desorption, X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), high resolution transmission electron microscopy (HRTEM), H₂ temperature-programmed reduction (H₂-TPR), H₂ pulse chemisorption and O₂ temperature-programmed desorption (O₂-TPD) were used to investigate the physical properties of the fresh and used OCs. The results show that the platelet-stack structure of nanocomposite OCs could significantly improve the metal support interaction (MSI), thus enhancing the sintering resistance. The effect of lanthanide promotion on maintaining this platelet-stack structure increased with the lanthanide radius, namely, La³⁺ > Ce³⁺ > Pr³⁺ > Yb³⁺. Additionally, the oxygen mobility was also enhanced because of the coordination of oxygen transfer channel size by doping small radius lanthanide ions. The CeNi@ZrO₂ showed a moderate ‘dead time’ of 220 s, a high H₂ selectivity of 94% and a nearly complete glycerol conversion throughout a 50-cycle CLR test. In a 50-cycle SE-CLR stability test, the CeNi@ZrO₂CaO showed high H₂ purity of 96.3%, and an average CaCO₃ decomposition percentage of 53% without external heating was achieved.     

透明聚丙烯成核剂的种类及其应用

介绍了无机类透明成核剂、有机类透明成核剂（芳基磷酸盐、山梨醇类、羧酸金属盐、脱氢枞酸及其盐类、支化酰胺类化合物）和聚合物型透明成核剂的主要品种、特点、在聚丙烯中的成核机理及其对聚丙烯性能的影响。     

外燃机热电联产与地下工程能源系统的优化配置

根据在我国地下工程中惟独选用柴油发电机作为备用电源的现状和由此产生的主要问题，指出采用外燃机热电联产技术不仅可以有效地提高现有工程的伪装性能、能源利用效率，而且通过与空调除湿系统的有机结合还可以解决工程对采暖、除湿和制冷的综合需求。最后，对外燃机热电联产技术在地下工程中的应用可行性和系统配置方案进行了探讨。     

悬臂梁基板对压电纤维复合物驱动性能的影响

压电纤维复合物在驱动、传感、结构健康检测等领域具有广泛应用,研究压电纤维复合物的驱动性能对于压电纤维复合物实际应用具有重要意义。通过实验研究不同驱动电压条件(峰值、频率及偏置)对压电纤维复合物悬臂梁结构顶端位移的影响,探讨悬臂梁基板材料与压电纤维复合物驱动性能的关系,基于欧拉-伯努利梁理论利用悬臂梁顶端位移计算压电纤维复合物的驱动力。结果表明:压电纤维复合物的驱动性能具有明显的迟滞性。悬臂梁顶端位移的大小与驱动电压峰的峰值呈线性关系,且其不仅与驱动电压的峰值有关,还与驱动电压的偏置、频率有关。压电纤维复合物的驱动性能随基板不同而不同,其对刚性铝板的驱动力为5.2 m N,对柔性麦拉膜的驱动力为0.2 m N。