共查询到19条相似文献,搜索用时 171 毫秒
1.
某石化企业新建装置中6台塔设备在投用前进行水压试验时发现下封头与裙座处开裂漏水。经疲劳计算、强度复核及开裂处的材料分析,确定了局部修理方案。通过两年的使用及跟踪分析评估,验证修理方案合理,能够满足该批塔设备现场安全长周期使用的要求。 相似文献
2.
3.
1 尿素合成塔概况1.1 基本结构及材料我公司三胺厂的尿素合成塔主要由筒体、塔口段、下封头、上端盖和高压连接螺栓以及裙座组成,总高度约16m,塔内装有10层塔板。主要安全附件设于进出口配管上。该塔壳体材料为WB36钢板,厚55mm。衬里材料为耐腐蚀不锈钢X2CrNiMo25.22.2,厚5mm,其化学成分和力学性能见表1和表2。表1 X2CrNiMo25.22.2的化学成分%成分CrNiMoCPSMnSiN含量24~2621~23.51.9~2.6≤0.020≤0.020≤0.0151.5~2.0≤0.40.1~0.15表2 X2CrNiMo25.22.2的力学性能项 目σb/MPaσs0.2/MPaδ5/%数 值≥580≥270≥301.2 … 相似文献
4.
前言 裙座与塔器封头连结形式有搭接和对接,搭接仅适用于小塔,多数情况采用对接,从而产生了如何计算裙座顶端与封头切线的距离以及如何确定裙座上排气管等位置尺寸的问题。 JB4710-92 《钢制塔式容器》表E2给出了部分规格的塔器裙座与下封头对接时裙座顶端与封头切线的距离,但仅适用于对接处不存在间隙且裙座和封头等壁厚的情况。对于一般情 相似文献
5.
6.
对高径比H/D15且高度H30 m的塔器,裙座与下封头对接焊缝连接处在横风向共振的作用下,容易产生疲劳破坏。以某精制塔为例,依据NB/T 47041—2014标准及释义,采用理论计算方法对焊缝处的交变应力强度幅进行计算,并建立有限元模型进行分析,应力分析计算结果和理论计算非常吻合,真实准确地对该焊缝的疲劳强度进行安全评定,并对不同焊缝高度的疲劳强度进行校核和对比,为高耸塔的设计提供参考。 相似文献
7.
8.
9.
对乙醇脱氢一步法合成乙酸乙酯新工艺的分离工艺中的关键设备萃取精馏塔和水洗塔的工艺条件进行了研究,实验验证了采用萃取精馏塔和水洗塔的可行性。 相似文献
10.
11.
12.
Various experimental techniques and finite element modelling (FEM) were employed to assess mechanical and chemical properties of vinyl-ester (VE)/poly(acrylonitrile-butadiene-styrene) (ABS) blends with different ABS particle content. The blends were to be used as a toughening agent for interlayer toughened VE/glass composite material. Firstly, the materials' fracture toughness and tensile properties were examined, the results showing excellent toughening potential of the blends as well as a non-linear trend for fracture toughness as a function of ABS weight content. The tensile testing of the blends served to define the yield point of the materials and to obtain their stress-strain curves, which were then used as input into finite element analysis models. The mechanical testing results suggested that a chemical reaction may have occurred between the constituents of the blends. Based on the Raman spectroscopy results and mechanical testing data, 7% of ABS was believed to be the critical ABS content where significant changes in the materials' chemical composition and consequently in mechanical properties occurred. Finally, FEM was undertaken to further verify the existence of this sudden variation in material's properties. 相似文献
13.
奥氏体不锈钢输油管道焊缝的应力腐蚀失效分析 总被引:2,自引:0,他引:2
某渣油管道的材质为奥氏体不锈钢,在设备检修时发现其接头上共有两处产生焊缝开裂失效.利用检测设备对管道焊缝的化学成分及腐蚀物、金相组织、断口、机械性能测试、无损检测分析、焊接问题等项目进行分析,结果表明:应力腐蚀是管道失效的原因,而较差的焊接质量使接头形成了应力源和腐蚀源. 相似文献
14.
15.
16.
以某石化公司焦炭塔为研究对象,首先分析焦炭塔受力情况,进而对比新型板焊结构和整体锻件结构的优劣性,为此后大型焦炭塔裙座连接部位的结构设计提供参考。两种结构的对比主要围绕结构内应力分布的对比。运用有限元分析软件ANSYS建立新型板焊结构以及整体锻件的二维模型,对结构只受重力和内压、升温、降温三种工况分别进行分析,分别得出在三种工况下结构内的机械应力和热应力。根据分析结果,对比两种结构的等效应力强度大小和应力集中点的位置。通过对比,可以得出以下结论:新型板焊结构在三种工况下的最大应力均出现在上部角焊缝上方的塔体上,最大值达到371.5 MPa,是焦炭塔开裂的主要原因;整体锻件的最大应力出现在裙座与塔体连接的圆弧过渡处,最大值为273.3 MPa,应力分布状况要优于新型板焊结构。 相似文献
17.
Engineered cementitious composites (ECC) are ultra-ductile fiber-reinforced cementitious composites. The nanoscale chemical and mechanical properties of three ECC formulae (one standard formula, and two containing nanomaterial additives) were studied using nanoindentation, electron microscopy, and energy dispersive spectroscopy. Nanoindentation results highlight the difference in modulus between bulk matrix (~ 30 GPa) and matrix/fiber interfacial transition zones as well as between matrix and unreacted fly ash (~ 20 GPa). The addition of carbon black or carbon nanotubes produced little variation in moduli when compared to standard M45-ECC. The indents were observed by electron microscopy; no trace of the carbon black particles could be found, but nanotubes, including nanotubes bridging cracks, were easily located in ultrafine cracks near PVA fibers. Elemental analysis failed to show a correlation between modulus and chemical composition, implying that factors such as porosity have more of an effect on mechanical properties than elemental composition. 相似文献
18.
针对甲乙酮反应器进料泵轴断裂情况,通过材质检验,断口宏观特征观察及微观形貌分析,对其失效原因进行了分析。结果表明,泵轴材质化学成分、热处理状态、金相组织和力学性能符合相关标准规定,断裂呈脆性特征,断裂面具有对称性,且断裂面上存在疲劳断裂的3个特征区,其断裂是由双向弯曲应力作用下产生的疲劳断裂。 相似文献