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对压力容器中开孔接管靠近筒体与封头连接处的结构模型,采用有限元应力分析法分析筒体与封头连接处边缘应力和接管与筒体相贯区局部高应力叠加影响规律,通过建立不同的模型(开孔率不同,开孔和筒体与封头连接处距离不同)进行对比。结果表明,两种应力会相互影响,且开孔率越大,相互影响越大。当开孔率达到0.52时,接管与筒体相贯区的一次局部薄膜应力受筒体与封头连接处边缘应力的影响会增大10.27%,封头过渡区的一次局部薄膜应力受接管与筒体相贯区高应力的影响会增大18.8%。 相似文献
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高压容器筒体与封头连接区是高压容器的高应力区之一,对其进行了三维有限元分析,获得了连接区的应力分布信息.结果表明:高压容器筒体与封头连接区最大应力强度出现在过渡区与球壳连接处. 相似文献
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本文以平板封头与筒体连接受均匀内压为例,建立不同尺寸过渡圆角的四种有限元模型,分别计算分析,并对结果进行应力分类,得出过渡圆角对有限元计算结果及应力分类影响的相关结论。 相似文献
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利用ANSYS 16.0有限元分析软件,以半球形封头、椭圆形封头和无折边球形封头3种凸形封头为研究对象,通过改变削边长度和削边形式,得到其应力分布规律,并进行优化分析。结果表明:3种封头形式压力容器最大等效应力均集中于筒体和封头过渡区域;在相同尺寸和相同削边形式下,应力集中系数大小顺序为无折边球形封头>椭圆形封头>半球形封头;随着削边长度L的增加,椭圆形封头和无折边球形封头压力容器应力集中系数K均呈增大的趋势,对于半球形封头压力容器,削边长度L出现临界值;半球形封头压力容器优化效果最为明显。 相似文献
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尿素合成塔封头接管区和过渡区三维有限元分析 总被引:4,自引:0,他引:4
以国内大型化肥厂所采用的直径2.8m高36m的尿素合成塔为例,对不同形式的接管结构和筒体与封头之间的过渡区,采用三维有限元法进行了分析计算。 相似文献
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由于高压容器筒体与封头的连接区的不连续,往往导致不连续区局部应力集中,而且结构较为复杂,很难用解析法进行精确求解。采用有限元分析软件ANSYS对高压容器筒体与封头的连接区进行了应力分析,从而为压力容器不连续区应力分析提供了一种合理的方法和依据。 相似文献
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Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn3−x Cox(PO4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ-Zn3 (PO4 )2. Solid solutions of orthophosphates of composition Zn3−x Cux (PO4 )2 exhibited more-complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu3 (PO4 )2, termed here the "ε-phase," predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the "η-phase") adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the "δ-phase"), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the "β-phase") had the structure of β-Zn3 (PO4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the "-phase") exhibited the structure of γ-Zn3 (PO4 )2. Attempts to synthesize Cu+ ZnPO4 and Cu+ Cu2+ Zn3 (PO4 )3 were unsuccessful. 相似文献
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为了提高油田的生产效率,设计最佳的油气集输处理的工艺流程,更好地完成油气水分离处理的任务。对油气集输工艺技术进行优化,发挥高效油气水分离处理设备的优势,提高油气水处理的质量,保证油气集输工艺顺利实施,获得最佳的油田产量外输。 相似文献
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建设创新型国家是我们中华民族的历史责任。“自主创新、重点突破、支撑发展、引领未来”的16字方针应当成为我们未来创新活动的指南。建设创新型国家把自主创新放在首位,并提出了引领未来的高标准要求。钢铁科技创新必须突出重点,抓住创新成果产业化这个关键,支撑起行业和国民经济的发展。 相似文献
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相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。 相似文献
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膜的污染和劣化及其防治对策 总被引:25,自引:0,他引:25
较为系统地介绍了膜污染和劣化的定义和特点,因膜污染和劣化而造成的膜性能变化,以及如何预防、减少或清除膜污染和劣化的一些通用方法。 相似文献
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James L. White David G. Salladay David O. Quisenberry Donald L. MacLean 《应用聚合物科学杂志》1972,16(11):2811-2827
Gel permeation chromatographic (GPC) and thin-layer chromatographic (TLC) studies of polystyrene, polybutadienes (BR), and their copolymers (SBR) have been carried out. GPC primarily separates them on the basis of molecular size, and TLC, on the basis of composition. Methods of obtaining absolute molecular weight distributions for BR and SBR based upon variations of the Strasbourg Universal Calibration procedure are described. In particular, [η]–M relationships in both the GPC solvent (THF) and in a second solvent (toluene) were used; in addition, results of statistical mechanical calculations for \documentclass{article}\pagestyle{empty}\begin{document}$\overline {s^2 }$\end{document} (based on the assumption of negligible steric hindrance and freely rotating bonds) were applied. An experimental comparison of these methods was carried out, and use of the [η]–M relationships for both solvents was found to give satisfactory results. The predictions of the statistical theory were too low. A detailed study of polymer–solvent–gel interaction in the GPC unit was made through investigation of ternary phase equilibrium in the (polystyrene)–THF–(polymer) system. The polymers studied included BR and SBR with varying styrene contents. Experimental techniques for TLC separations of BR, SBR, and polystyrene according to the composition are described. 相似文献