从一起氧压机烧缸引发氧气囊燃烧的事故谈铁锈、渣对氧气生产的危害

介绍铁锈，渣对氧气生产的危害，分析一起因铁锈，渣引起的氧压机着火事故，并针对分析的原因提出预防措施。     

氧压机一级进口增设过滤器

<正>我车间有两台2-1.67/150型氧气压缩机,储气罐为水封式,与氧压机进口连接管道相距约50m。由于进气管道内氧化物太多(铁锈渣),气缸和活塞皮碗(后改为聚四氟乙烯活塞环),磨损严重。     

氧压系统燃爆与铁锈的关系

结合实际发生的氧压机燃爆事故,在分析了铁锈在氧压系统中的引爆机理的基础上,提出了相应的防范措施。     

碱-盐复合激发煤气化粗渣的水泥胶砂强度特性

采用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)分析了煤气化粗渣的微观结构、元素分布及物相组成;优选碱-盐复合激发剂,制备了掺煤气化粗渣水泥胶砂试件,分析了碱-盐激发剂对胶砂抗压、抗折强度的影响,并探讨了碱-盐激发下煤气化粗渣水泥胶凝硬化产物的微观结构和物相组成。结果表明:煤气化粗渣以层片状、不规则粒状颗粒居多,富含C、O、Si、Al、Ca、Fe等元素,存在火山灰活性的硅氧、铝氧或铝-硅-氧相;复合激发效果优于各自单掺的激发效果,其中掺硫酸钙与氢氧化钠组合激发效果最佳;激发剂有助于发挥煤气化粗渣的火山灰活性,促进煤气化粗渣水泥胶凝体系中水化产物的生成,提升了胶凝材料的结构强度。     

转炉刮渣器结构优化改造实践

本公司根据氧枪刮渣器现场使用中存在问题,对现有刮渣器结构进行优化改造,减少汽缸及附件烧损,实现柔性抱枪,城少设备损坏。     

狭缝式W火焰锅炉翼墙上部结渣原因分析及消除

为研究600 MW超临界W火焰锅炉翼墙上部结渣原因,进行试验研究。从炉内检查发现的结渣位置和试验测试结果分析炉内的流场情况。结果表明：下炉膛上部翼墙区域温度达到1 300℃以上,高于入炉煤软化温度;氧浓度低,CO浓度在10 000 μL/L以上,呈强还原性气氛,存在明显的结渣倾向;同时分析燃烧器下方与翼墙之间存在侧面向上的涡流,将熔融状态的煤灰颗粒带至翼墙上部墙面,这种特殊的流场是造成翼墙上部结渣的主要原因。结合试验分析结果,有针对性地采取燃烧调整、燃烧器喷口布置优化、防结焦风优化等措施,解决W火焰锅炉下炉膛严重结渣的问题,锅炉运行可靠性得到明显提高。     

深冷文献消息(国内部分)

946101改进操作缩短开工时间提高氖、氦本文对压氧系统中山十铁锈的存江,而引起燃p量与质量烧、爆炸事故的机理进行了较深入的分析,并针对张德明《冶金动力/)1992凡41。1铁锈在压氧系统中充当的是一引爆源这一关键因素首钢氧气厂针对制氧装置中氖氦流程存在的问提出了防范措施。题改进了氖氦分离装置,开工用混合气改为用纯946104采用增压透平膨胀机改适可逆式板氖,装置生产以外的冷循环改为停机保持冷状态,热器流程制氧机的探讨国产钢瓶暂代国外钢瓶充氖然后返装,以及强化氖金大忌《冶金动力》1994凡411~15氦系统操作等。本文探讨采用增压透…     

磷酸锌醇酸涂层下的碳钢锈层

在磷酸锌醇酸涂层下,碳钢黑色锈层对金属基底和涂层都有良好的粘合性能,锈薄且传播速度慢。XPS 分析表明,墨色锈层主成分为 FeO,并含 Fe、Fe~(3+)和少量的 Zn(OH)_2,但不含磷。磷酸锌醇酸涂层对传质阻力的增大,以及涂层下氧浓差电池中缓蚀剂 Zn~(2+)的出现,是影响铁锈生长速度的重要因素。     

环保型铁锈转化剂的制备及其性能

针对钢材表面的除锈问题,以低毒的丙烯酸乳液、单宁酸、异丙醇等为原料,通过正交试验优化配方,制备了一种环保型铁锈转化剂。采用中性盐雾试验(NSS)、开路电路-时间曲线、Tafel曲线、扫描电镜、热重/差热综合分析等方法研究了其性能。结果表明:当m(丙烯酸乳液)=6.5 g,m(单宁酸)=1.5 g,m(异丙醇)=0.5 g时,铁锈转化剂的综合性能最佳,以此配方制备的铁锈转化膜层致密、平整,耐热性好,1 000℃时不分解,其耐中性盐雾腐蚀(NSS)达24 h,在3.5%NaCl溶液中的腐蚀速率为0.037 8 g/(h.m2),对Q235钢有良好的防腐蚀保护作用。     

红泥填充氯化聚乙烯复合材料EI

讨论了石油炼厂废油渣对氯化聚乙烯的增塑软化作用,炼铝工业废渣红泥的填充效果,以及填充复合材料的物性、热氧稳定性及耐臭氧性等。     

Effects of microstructure on oxygen transport in perovskite-type oxides

La_0.1Sr_0.9Co_0.9Fe_0.1O_3-δ (LSCF) particulates with different microstructures were prepared and oxygen sorption kinetics on these particulates was studied by a gravimetric method. The surface reaction on the crystallite surface is the rate-limiting step for oxygen sorption in loosely packed LSCF powders. In this case the sorption kinetics can be described by a linear driving force model with crystalline size independent sorption and desorption surface reaction rate constants. Oxygen sorption and transport rates are affected by the intercrystalline (grain boundary) resistance for LSCF particulates prepared with a press-sintering step, and in these cases both crystalline and particulate sizes determine the oxygen sorption rates. Sorption rate constant increases when increases the oxygen partial pressure of the atmosphere surrounding the LSCF samples.     

空分设备氧气外送流程的改造总结

当后续生产用氧量减少时,空分设备出塔氧气的压力足以满足后续生产用氧压力要求,此时若再用氧压机对出塔氧气进行压缩后供氧,会造成很大的能源浪费。文章对氧气直接外送方案进行了可行性分析,介绍了氧气直接外送的改造方案、经济效益以及改造后的操作变化。     

Effect of chloride ion on corrosion behavior of low carbon steel in 0.1 M NaHCO3 solution with different dissolved oxygen concentrations

The corrosion behavior of low carbon steel in 0.1 M NaHCO_3+ 0.1 M NaCl solution with different dissolved oxygen concentrations was investigated with gravimetric tests and electrochemical measurements.Results show that the corrosion mass loss of steel is remarkably increased with the addition of chloride ion. In the initial stage, the carbon steel tends to active dissolution due to the dissolution effect of chloride ion on the oxide film; as a result, the corrosion potential maintains as low values. With the immersion time going by, the corrosion potential of the steel is promoted as a result of the accumulation of the corrosion products. However, the rust layer is loose and porous due to the deteriorating effect of chloride ion, which decreases the reduction resistance of oxygen. Meanwhile, the porous rust layer could be repaired by the depolarization of oxygen. Under the synergistic effect of chloride ion and oxygen, the corrosion of the steel is accelerated during the repeated process of dissolution and reparation of the oxide film.     

常压粉末绝热贮槽及槽车汽化氧气的回收

介绍了将液氧在生产贮存过程中汽化的氧气 ,以及槽车充液前卸压放空的氧气回收充瓶的流程。该方法投资少 ,收益快 ,实际运行安全、可靠     

平衡管网氧气供求的操作分析

钢铁企业氧气供求不平衡,造成氧气放散率居高不下,能源浪费严重。根据南钢气体公司的实际情况,采取加强生产协调、优化氧气管网供应、应用变负荷技术等措施,既解决了氧气供求矛盾,也实现了降低氧气放散率和节能降耗的目标。分析平衡管网氧气供求关系的优化操作及其效果。     

杭氧高压充瓶压缩机技术的发展

简要介绍杭氧充瓶氧压机更新换代的历史过程和应用技术的发展状况,指出各代充瓶氧压机的优缺点,并介绍杭氧目前已初步形成的充瓶用氧、氮压缩机产品系列化的主要参数,可供用户优化组合选型时参考。     

Perovskite-type BaTiO3 ceramics containing particulate SiC

BaTiO₃-based composites with nanosized SiC particulates were successfully fabricated by a hot-pressing technique in an argon atmosphere. Crystal structure and phase transformation behaviour were investigated by X-ray diffraction analysis, linear thermal expansion analysis and internal friction measurement. It was confirmed that the added SiC particulates were uniformly distributed within the matrix BaTiO₃ grains, with some larger particulates located at the BaTiO₃ grain boundaries. In addition, there were no reaction phases between BaTiO₃ matrix and SiC particulates. The crystal structure gradually changed from tetragonal to cubic phase with respect to the SiC content. The Curie temperature, T _c , was lowered as the SiC content increased. Moreover, the transformations in the low-temperature range almost disappeared above 1 vol% SiC. The diffused phase transformation phenomenon was observed as the SiC content increased up to 3 vol%. The results were associated with the grain-size reduction, the existence of oxygen vacancies and the residual stresses associated with the thermal expansion mismatch between matrix and SiC particulate. The influence on the domain structure development of SiC particulates dispersed within the matrix grains was also discussed.     

完善供氧系统 降低氧气放散率

天铁集团动力厂原供氧方式分散,没有实现联网和协调供应,造成氧气放散率高。为充分利用现有的设备和资源,实现联网和协调供应氧气,增设3#调压站和新/老区联网管道、铺设液体真空管道提取液体产品后,完善了供氧系统,实现了氧气的灵活调配供应,达到了回收富裕氧气、降低氧气放散率的目的。简介降低氧气放散率的通用措施,详细介绍氧气供应和贮存系统的完善方案以及取得的效果。