The concentric reducer in transfer oil line and some of the bends in the front of radiation section of cylindrical furnace in furfural equipment in a refinery suffered localized corrosion.
针对某炼油糠醛精制装置的抽出油加热炉出现转油线同心异径管及辐射段前流段的弯头局部腐蚀减薄的情况,从管件材料性能、蚀坑形貌、流体特性等多方面进行原因分析,确认主要是气泡冲蚀腐蚀的结果。
Standard system for reducers commonly used at home and abroad was introduced, thirty(30) safety incident cases caused by reducer failure were analyzed from aspects of fitting, welding, erosion, breakage, stress corrosion etc.
介绍了国内外常用异径管标准体系,从管件、焊接、冲蚀、爆裂、应力腐蚀等方面分析了30起由异径管失效而引起的安全事故案例;从失效分析和理论研究方面综述了国内外异径管的研究概况。
Detailed siress analysis was carried out for a section of the pipeline including an eccentric reducer on which long cracks appeared twice.
进而对曾两次出现长裂纹的偏心异径管管段进行细部应力分析。
The tapered pipe in air-cooling accessory line of a certain ammonia synthetic tower was cracked.
某厂氨合成塔冷气副线异径管发生爆裂事故,进行技术检验后分析了爆裂原因,材质为20钢的异径管内是高压富氢介质,氢分压21 MPa,该冷气副线长期处于关闭状态,由于副线中心管填料密封失效,使异径管长期超温工作,异径管在超温高压富氢介质工况下发生了氢腐蚀低应力脆性断裂。
Based on statistics analysis of an invalid tapered pipe with finite element software Pro/MECHANICA,the stress distribution diagram was obtained and cause of tapered pipe failure was found.
利用有限元软件Pro/MECHANICA对一失效的异径管进行了静力学分析,得到了异径管应力分布图,找到了异径管失效的原因。
Analysis of finite-element strength of reducer tee;
异径三通有限元强度分析
Experimental study on asymmetrical rolling with work roll edge contact;
异径轧制低碳钢的力学性能参数与粗糙度实验研究
The finite difference method and 2 D steady laminar model were applied to the numerical simulation for the fluid flow inside the molten pool during unequal diameter twin roll strip cast rolling.
采用有限差分和二维稳态层流模型，应用边界适体坐标（ＢＦＣ）技术对异径双辊薄带铸轧熔池中钢液的流动进行了数值仿真·分析了铸辊转速、液面宽度、浇注区宽度、浇注位置等操作和设计参数对流场的影响·计算结果表明钢液注入熔池后，在双辊相向转动的作用下，会引起强制对流并产生２个逆时针方向的回流区·通过对不同工况的分析指出浇钢时采取低压头、偏流浇注并维持一定的液面高度等操作有利于铸轧过程的稳定进行
The finite difference method and 2 D transient heat transfer model were applied to the numerical simulation for the development of temperature distribution patterns in the molten pool and in the solidified metal layer formed on the surfaces of two opposite rotating rolls during the early stage of unequal diameter twin roll strip cast rolling process.
采用有限差分和二维非稳态凝固传热模型，应用边界适体坐标（ Ｂ Ｆ Ｃ） 技术对异径双辊薄带铸轧熔池中钢液的初始凝固传热特性进行了数值仿真·分析了铸轧起始阶段熔池内温度场的发展变化及辊面凝固薄壳的生长过程，指出１００ ｓ 为适宜的起始铸轧时间，此时凝固末端距熔池出口约９ ～１０ ｍ ｍ·探讨了钢液过热度、辊壁内表面与冷却水的对流换热系数和辊壁导热热阻等设计及操作工艺参数在起始铸轧阶段对钢液的凝固传热及凝壳形成的影响，结果发现辊壁是制约熔池中凝固传热的重要因素，直接影响着凝壳的快速生长