海上气田高压低温压力容器设计及材质选择

针对南海某气田高压低温压力容器低温板材厚度超过许用范围的问题,提出采取减小设计压力、降低筒体直径、合理进行压力与温度的设计工况组合等措施以减小低温压力容器的壁厚,得到适用于高压低温工况下压力容器材质选择的方法,为高压低温大壁厚压力容器的设计提供可借鉴的方法。

Tape casting of borosilicate glass/Al_2O_3 composites for LTCC substrate with various relative molecular masses of PVB

The dispersion, stabilization and rheological properties of the slurry with various relative molecular masses of PVB were studied. The sintering properties, microstructure and dielectric properties of borosilicate glass/Al203 composites were also investigated. The intensities of the typical vibrating bands decrease with the decrease of the relative molecular mass of PVB, which demonstrates that the content of butyral groups in PVB binders decreases correspondingly, leading to a rapid decrease in the viscosity of the mixed slurry. The solid content of samples increases with the decrease of the relative molecular mass of PVB, and this further leads to the increase of tape thickness, bulk density and dried-shrinkage coefficient of tapes. The bulk density, relative density, three-point strength and dielectric constant of sintered samples increase with the increase of the solid content, and the shrinkage and dielectric loss decrease. By contrast, samples for PVB-5s exhibit better properties of a bulk density of 3.10 g/cm3, a relative density of 98.1%, a three-point strength of 208 MPa, aεt value of 8.01, a tanδ value of 7.6× 10^-4 at 10 MHz and a well matching with Ag electrodes.

面向冷能高效利用的管道关键技术与挑战

在“碳达峰、碳中和”战略背景下,冷能作为一种新型绿色能源得到广泛关注和重视。一系列新型冷能利用技术应运而生。然而,目前冷能产业面临利用率低、顶层规划缺乏、关键技术创新不足、规模化应用受限等难题。文章对冷能综合高效利用、低温材料、管道设备等关键技术进行总结与展望。管道系统作为冷能产业的重要基础设施,通过分析其工作状态、潜在风险与失效形式、关键技术等,明确冷能产业管道技术面临的挑战和冷能利用管道技术的发展趋势,提出面向冷能高效利用及其管道发展建议,以期为冷能产业高质量发展、高效稳定运行、安全保障和节能减排提供强力支撑。