提高P7泵柱塞偶件清洁度的工艺措施

通过对P7泵柱塞偶件去毛刺工艺的改进,确保P7泵柱塞偶件清洁度达到规定的要求。     

Hydrogen production for energy: An overview

Power to hydrogen is a promising solution for storing variable Renewable Energy (RE) to achieve a 100% renewable and sustainable hydrogen economy. The hydrogen-based energy system (energy to hydrogen to energy) comprises four main stages; production, storage, safety and utilisation. The hydrogen-based energy system is presented as four corners (stages) of a square shaped integrated whole to demonstrate the interconnection and interdependency of these main stages. The hydrogen production pathway and specific technology selection are dependent on the type of energy and feedstock available as well as the end-use purity required. Hence, purification technologies are included in the production pathways for system integration, energy storage, utilisation or RE export. Hydrogen production pathways and associated technologies are reviewed in this paper for their interconnection and interdependence on the other corners of the hydrogen square.Despite hydrogen being zero-carbon-emission energy at the end-use point, it depends on the cleanness of the production pathway and the energy used to produce it. Thus, the guarantee of hydrogen origin is essential to consider hydrogen as clean energy. An innovative model is introduced as a hydrogen cleanness index coding for further investigation and development.     

带钢表面清洁度的探讨

随着钢材市场竞争的日趋激烈,对于冷轧产品,用户不仅要求钢板的性能、板形,对钢板的表面清洁度也提出了更高的要求。因此表面清洁度成为冷轧产品升级的一个重要制约因素。从轧制油、原料、酸洗质量、乳化液、轧制工艺以及吹扫装置等方面对带钢表面清洁度的影响进行了分析探讨。     

Dynamic interaction of refractory and molten steel: Effect of alumina-magnesia castables on alloy steel cleanness

High quality alloy steel is an important material needed for social and economic development. It is of great significance to major national projects and defence security. Refractories are used in the smelting process of steel; they are some of the main sources of impurities which have an important effect on the quality of steel. As alumina-magnesia refractories are the main lining materials used for steel refining, the influence of these refractories on the cleanliness of molten steel under dynamic smelting conditions has been studied. The size, quantity, composition, and structure evolution of inclusions in steel are analysed. The results show that after smelting, the content of alloy elements in the steel is stable, and that the total oxygen content and inclusions in the steel are increased by the corrosion of the alumina-magnesia castables. However, the maximum average particle size of the inclusions in the steel was limited to 20?µm, which did not cause large inclusions in the steel or seriously affect the quality of steel. During the dynamic melting process, because of the presence of Si and Mn in the alloy steel, the inclusions changed from homogeneous CaS wrapped Al₂O₃-MgO composite sphere to MnS wrapped egg-shaped structure. The alloy elements in steel were found to be beneficial, as they reduced the effect of alumina and magnesia inclusions on the quality of steel. The results indicate that it is feasible to smelt high quality alloy steel using alumina-magnesia carbon-free castable, and that it would be better to limit the refining time to 45?min during smelting.     

镁钙质和镁质中间包涂料对钢液洁净度的影响

通过现场对比实验 ,研究了镁钙质和镁质中间包涂料对钢液洁净度的影响。结果表明 :( 1)两种涂料对钢液均有明显的脱氧作用 ,其脱氧率与钢液的原始全氧含量有关 ,原始氧含量越高 ,脱氧率越大 ;( 2 )对铝镇静钢而言 ,镁钙质涂料有比镁质涂料更好的脱氧效果 ,脱氧率能高出 5 %～ 15 % ;而对硅镇静钢 ,两种涂料对钢液的脱氧效果几乎没有差别 ;( 3)两种涂料对铝镇静钢和硅镇静钢均没有明显的脱硫作用。     

关于过滤器使用的一些技术探讨

对中国计量科学研究院（NIM）某实验基地在洁净室建设和运行过程中过滤器的使用方面进行了一些技术探讨，根据实际经验和看法对过滤器的性能和效率、使用寿命及其评判标准进行了技术总结，并提出选择滤料面积大的过滤器和一次性初效过滤器是性价比较高的技术方案。     

集中空调系统的卫生问题不容忽视

本文从空调环境对人体的健康影响分析空调室内的空气质量,指出集中空调系统的卫生管理是非常重要的。本文对空调系统的污染状况及其产生原因进行了讨论,强调空调通风系统的卫生问题应该引起重视,同时也指出空调设备和管道的清洗对节能也有好处。     

LED-GaP外延晶片洁净优化技术的研究

介绍了绿色,红色发光ＧａＰ外延晶片不同发光强度的无损检测方法。分别用短紫外光和蓝光激发方式,在室温下,有效地观测了ＬＥＤ－ＧａＰ：Ｎ的多峰ＰＬ谱。根据对上述两种发光ＧａＰ外延晶片的相对光强与金属杂质Ｆｅ,Ｃｕ,Ｎｉ和Ｃｒ紫外荧光谱的实测数据的相关性,讨论了ＬＥＤ－ＧａＰ外延晶片的工艺质量优化和洁净度的问题。     

金属热处理工艺中清洗设备的应用

文章对目前市场上的热油炉清洗剂进行了分类,并对导热油焦、清洗前的准备及清洗后的验收进     

从电容器油的分子结构看性能

论述了当电容器油的清洁即净化合格时,油的基本性能是由其分子结构决定的。