浮头管束双头拉杆常规设计技术探讨  

Exploration of rule design for double-end pull rod of floating head tube bundle

作　　者：陈孙艺 CHEN Sunyi(The Challenge Petrochemical Machinery Corporation of Maoming,Maoming 525024,China)

机构地区：[1]茂名重力石化装备股份公司,广东茂名525024

出　　处：《压力容器》2024年第8期30-39,共10页Pressure Vessel Technology

基　　金：广东省科技创新战略专项资金项目(2022S002)。

摘　　要：针对双头拉杆浮头管束开发应用中的技术问题,基于现有标准规范并结合工程经验,研发了这一创新结构案例中组合式连接结构设计校核的3种技术方法。提出了应用于胀焊组合管接头拉脱力的当量计算方法及其许用拉脱力的加权等效计算方法。技术应用于强度焊接与管孔内开一条环槽的强度胀接组合管接头结构强度分析,结果表明,将组合管接头的焊接长度转换为胀接长度,其当量拉脱力计算结果保守可靠,为5.7 MPa;将组合管接头的焊缝许用拉脱力与强度胀接许用拉脱力通过加权平均计算,所得的等效许用拉脱力为7.4 MPa,更接近工程实际;但是也需考虑其受力趋势是正向拉脱还是反向拉脱,或者是否位于正向拉脱与反向拉脱的过渡区域,作适当修正。同时,还提出了拉杆与管板之间螺纹加焊接的组合连接结构型式,以及校核其组合强度的分类分步法。计算分析表明,浮头管束的双头拉杆满足结构强度要求,设计是可行的。This paper aims at the technical problems in the development and application of the double-end tie rod floating-head tube bundle,based on the existing standards and engineering experience,three technical methods were developed for the design and verification of combined connection structures in the case,which is an innovative structure.An equivalent calculation method for the pull-out force of expansion welded combination tube joints and a weighted equivalent calculation method for the allowable pull-out force of expansion welded combination tube joints was proposed.The technology was applied to the structure strength analysis of the strength welding and the strength expansion of a ring groove in the tube hole.The results indicate that the calculated equivalent pullout force is conservative and reliable when the welded length is converted to the expansion length,and it is 5.7 MPa.The allowable pull-out force of weld and the allowable pull-out force of strength expansion joint of the composite tube joint are calculated by weighted average,and the equivalent allowable pull-out force obtained is 7.4 MPa,which is closer to the actual engineering situation.However,it is also advisable to consider whether the force trend is positive or negative pull-out,or in the transition zone between positive pull-out and negative pull-out,make appropriate correction.A combination connection structure type of threaded and welded connection between the pull rod and the tubesheet was also proposed,as well as a classification and step-by-step method for verifying their combined strength.The calculation and analysis show that the double-end tie rod of floating-head tube bundle meets the structural strength requirement and the design is feasible.

关 键 词：双头拉杆 拉脱力 管束 换热器 

分 类 号：TH49[机械工程—机械制造及自动化] TQ051.5[化学工程] TQ050.2