1 000m3轻烃球罐焊接缺陷成因分析及对策

对两台1 000m3轻烃球罐焊接缺陷产生的原因进行分析,并提出了相应的解决措施。     

SDS表面活性剂在纳米尺度多层石墨烯的吸附自组装分子模拟

采用分子动力学模拟分别研究了纯水和电解质溶液中SDS表面活性剂在纳米尺度石墨烯表面的自组装结构,考察了不同石墨烯层数对自组装吸附形态和SDS/石墨烯复合物悬浮密度的影响。模拟结果揭示了上述两种溶剂介质中,SDS的表面自组装结构形态与石墨烯的结构层数有关,增加石墨烯的层数能够加大吸附表面活性剂向溶液中的伸展程度,使表面活性剂自组装结构膨胀。此外电解质存在能够导致SDS表面活性剂在石墨烯表面吸附形态由多层结构向半圆胶束转化。模拟计算进一步发现SDS/石墨烯超分子复合物的悬浮密度随石墨烯层数的增加呈近似线性增加。     

β-二酮在水/超临界二氧化碳界面的分子动力学模拟

The structural and dynamical properties of hexafluoroacetylacetone (HFA) and acetylacetone (AA) at the water/supercritical CO2 (Sc-CO2) interface at 20 MPa and 318.15 K are investigated by molecular dynamics simulations. The TIP3P potential is used for water and the EPM2 model is for CO2. The water phase and SC-CO2 phase form a distinct immiscible liquid-liquid interface. The two chelating molecules show interfacial preference. Comparatively, the AA molecules show somewhat more preference for interfacial region, whereas the HFA molecules are preferably near the Sc-CO2 phase. The orientational distribution of the β-diketone molecules and the radial distribution functions between β-diketones and solvents are obtained in order to study the microscopic structural properties of the β-diketones at the water-SC-CO2 interface. It is found that the translational diffusion and rotational diffusion of HFA and AA are obviously anisotropic and decrease as the β-diketone molecules approach the interface. The anisotropic dynamic behavior for the solute molecules is related to the corresponding structural properties.     

N610E钢制10万m3原油储罐组焊技术

N610E钢属ReL≥490MPa调质高强钢,可适用于100kJ大线能量焊接,首次应用于10万m3大型原油储罐的建造,钢板经检验和复验各项性能优良。设备的焊接工艺评定按JB4708—2000和GB50128--2005进行,数量较多,程序复杂。现场组焊遵循有关标准规范,尤其是通过调整壁板纵缝坡口型式和间隙控制了气电立焊线能量,结果表明N610E各项性能均满足10万m3大型啄油储罐的建造。