基于中美欧规范对LNG储罐环向预应力损失值的比较分析

为保证LNG储罐混凝土外罐正常操作时受力合理，需要对外罐施加预应力来抵消内部气压、液压以及穹顶自重的作用。本文结合实际项目分别利用公式以及ANSYS软件提取两种方法，计算了外罐及环梁部位环向所需预应力的大小。结果表明，公式计算后外罐底部及环梁处所需预应力值较大，经调整后，外罐底部及顶部所需预应力有所减小，但环梁处相较于调整前有所提升。从所需预应力结果对比可知，软件提取相较于公式计算更为准确经济。经过初步配筋后采用中国、美国以及欧洲规范分别计算环向预应力损失。预应力总损失由锚具变形损失、摩擦损失、弹性变形损失、钢筋松弛损失以及收缩徐变损失等组成，中国、美国以及欧洲规范计算最终结果基本一致。摩擦损失、钢筋松弛损失、混凝土收缩徐变损失所占的比例较大。     

Dynamic Oxygen Storage Opacity Measurements on Ceria-Based Material

Dynamic oxygen storage and release capability （OSC） measurement apparatus was designed to evaluate the OSC performance of ceria-based oxygen storage material. The optimum measurement condition was at a frequency of 0.1 Hz with the inlet gas-flow sequence CO （5S）→O2（5S）→CO→O2 and a flow rate of 300 ml·min^-1. Under this condition, similar regular square wave in the inlet and outlet of the reactor was obtained to guarantee the reliability of the dynamic OSC results. The dynamic OSC performance of the CeO2 and Ce0.67Zr0.33O2 mixed oxide prepared using the citric sol-gel method was studied at the optimum measurement condition with focus on both quantitative and qualitative analyses, The results reveal distinctly that Ce0.67Zr0.33O2 had better dynamic OSC performance because of its higher oxygen migration rate than CeO2. Under dynamic conditions, two CO2 production peaks occurred corresponding to the CO pulse and the O2 pulse, respectively, during the entire cycle. The intensity and ratio between the two CO2 productions were highly influenced by temperature and frequency indicating complex surface phenomena during the oxygen storage/release process, As a result, this set-up can be applied to the evaluation of ceria-based material on the OSC performance.     

Dynamic Oxygen Storage Capacity Measurements on Ceria-Based Material

The constant increase in the number of environ-mental protection regulations worldwide has broughtabout significant restrictions onthe nature and quantityof exhaust gases originating from mobile sources suchas automobile emissions .These increasingly dema…     

储罐事故泄压及弱顶结构的国内外规范研究

本文比较了GB 50160-2008《石油化工企业设计防火规范》、SH/T 3007-2014《石油化工储运系统罐区设计规范》和API 2000-1998《Venting Atmospheric and Low-Pressure Storage Tanks Non-refrigerated and Refrigerated》中关于储罐正常呼吸以及事故泄压装置的规范要求,比较了API 650-2007《welded Steel Tanks for Oil Storage》和GB 50341-2014《立式圆筒形钢制焊接油罐设计规范》的弱顶结构设计条件。     

LNG接收站大跨距补偿平台的可行性分析

液化天然气在输送过程中会将低温状态传递到管壁上，导致管道冷缩产生位移应力，需要在栈桥上设置补偿平台以解决此类问题。而建设一个补偿平台需要大量资源，投资至少在千万元以上，目前国内暂没有针对补偿平台跨距的系统性分析成果。本文通过理论分析和有限元软件模拟，将栈桥划分为多个大跨距补偿平台的设计方案，比较分析得出补偿平台最大跨距的可行性方案。该研究成果将能一定程度上填补大跨距补偿平台实现领域的空白，为后续液化天然气长栈桥输送设计提供参考。