Probabilistic estimation of the remaining lifetime of a oil and gas pipeline by the hoop-stress criterion

A forecasting model of the remaining lifetime of a diagnosed oil and gas pipeline is suggested depending on the strength reliability factor: the survival probability when the breaking point, pressure, diameter and wall thickness are regularly distributed, and the remaining lifetime is subject to a Weilbull two-parameter distribution.     

Probabilistic prediction of the residual lifetime of a gas pipeline under pitting corrosion

With the help of a deterministic formula and statistical simulation method, the residual lifetime distribution, numerical performance, and residual factors of gas pipeline reliability are determined for the case when the yield point, pressure, and sizes of pipe walls and defects are distributed according to the Gauss law. The optimal strategy is determined for preventing the failure of the examined gas pipeline, which minimizes emergency failure and increases gas pipeline safety.     

Statistical modeling of the oil and gas pipeline lifetime under bending and compression

The distribution of lifetime and reliability indices of oil and gas pipelines under bending and compression was found by means of a deterministic formula using a statistical modeling method. In this case, the strain-hardening coefficient is governed by the uniform law, while the conventional ultimate strength, shear modulus, working pressure, torque, compression force, diameter, and the wall thickness is subject to the normal one. As a result, the operational safety limits were established for northern oil and gas pipelines.     

输气管道压缩机干气密封故障分析

干气密封在天然气压缩机中应用比较广泛,涩宁兰输气管道涩北首站压缩机采用的是德国曼透平RV040／02压缩机,其密封采用的就是干气密封。结合该站1号压缩机干气密封出现的故障,对干气密封的原理、结构进行介绍,并对现有干气密封系统提出了改进意见。     

离心压缩机喘振分析及实例

论述了离心压缩机工作过程中喘振产生的机理，介绍了喘振的危害及常用判断方法，分析了影响喘振的主要因素，列举了常见的喘振实例。     

Optimal design of impeller for centrifugal compressor under the influence of one-way fluid-structure interaction

In this study, a method for optimal design of impeller for centrifugal compressor under the influence of Fluid-structure interaction (FSI) and Response surface method (RSM) was studied. Numerical simulation was conducted using ANSYS Multi-physics with various configurations of impeller geometry. Each of the design parameters was divided into 3 levels. Total 45 design points were planned by Central composite design (CCD) method, which is one of the Design of experiment (DOE) techniques. Response surfaces generated based on the DOE results were used to find the optimal shape of impeller for high aerodynamic performance. The whole process of optimization was conducted using ANSYS Design xplorer (DX). Through the optimization, structural safety and aerodynamic performance of centrifugal compressor were improved.     

高速大功率往复式天然气压缩机活塞杆有限元分析

随着天然气增压规模的不断扩大,作为天然气集输、采气和注气、气体贮藏、轻烃回收、脱硫增压、气体处理等所需的重大装备之一的往复式天然气压缩机,向着高速、大功率方向发展。以多列大型往复压缩机的重要承载部件活塞杆为研究对象,进行了静力分析、柔性分析及模态有限元分析。在假设条件的基础上,建立了活塞杆的有限元模型,计算分析得出活塞杆的应力分布,刚柔性特征及模态振型,为往复压缩机活塞杆的设计和优化提供了可靠的理论依据。     

离心空压机组故障分析及综合治理

振动是压缩机组的常见故障之一。对H220—9．5／0．95型离心空压机组多次因振动损坏的情况进行了调查研究．对比分析了其故障前后的操作参数及以往多次维修过程的相关维修数据,根据频谱分析的峰值多在叶轮轴工频或者0．4倍工频位置左右,确定了其振动具有轴承油膜涡动和油膜振荡的特征。进一步研究发现叶轮结垢脱落造成的微小转子动不平衡是引发油膜涡动的关键因素,椭圆滑动轴承本身稳定性差是造成油膜涡动的主要原因。提出了将椭圆滑动轴承改造为米歇尔轴承,提高进气过滤器精度,改善操作等措施,对机组进行综合治理。     

大攻角离心压气机优化设计与分析

以Reynold平均可压缩Navier-Stokes方程为主控方程,对原压气机进行三维数值计算,分析其内部流场不合理之处,在此基础上对原压气机进行优化设计.设计了三个进口角分别为56°、49°、43°的压气机,给出它们的特性曲线和速度矢量分布图,与原压气机进行对比.综合考虑三个压气机的压比、效率和工作范围,确定进口角为43°的压气机为优化设计后最终定型的压气机.     

干气密封技术及在离心压缩机中的应用

对120万t/a加氢裂化装置中循环压缩机的应用,阐述了干气密封的工作原理及在装置中的应用情况。     

Thermodynamic and aerodynamic meanline analysis of wet compression in a centrifugal compressor

Wet compression means the injection of water droplets into the compressor of gas turbines. This method decreases the compression work and increases the turbine output by decreasing the compressor exit temperature through the evaporation of water droplets inside the compressor. Researches on wet compression, up to now, have been focused on the thermodynamic analysis of wet compression where the decrease in exit flow temperature and compression work is demonstrated. This paper provides thermodynamic and aerodynamic analysis on wet compression in a centrifugal compressor for a microturbine. The meanline dry compression performance analysis of centrifugal compressor is coupled with the thermodynamic equation of wet compression to get the meanline performance of wet compression. The most influencing parameter in the analysis is the evaporative rate of water droplets. It is found that the impeller exit flow temperature and compression work decreases as the evaporative rate increases. And the exit flow angle decreases as the evaporative rate increases.     

C2回收装置离心压缩机干气密封失效分析及处理

某公司32万吨/年C2回收装置Ⅱ系列半产品压缩机在运行过程中,干气密封突然失效,造成装置停车。对干气密封和压缩机系统进行了分析,得出密封失效的根本原因是:在设计初期对主密封气中介质带液及细小的粉尘处理措施考虑不周,造成第一道干气密封静环卡套与轴套间间隙被粉尘堵塞,动静环表面的螺旋槽磨损及静环随动性差,最终导致干气密封失效。根据原因分析,提出相应的解决方案为重新引入一股新氢作为主密封气。     

天然气压缩机级间管道冰堵及处理

通过对天然气压缩机级间管道冰堵分析，可看出天然气低压脱水、甲醇防冻、管道加热在预防冰堵中的效能。     

浅谈我国主要天然气长输管线压缩机使用情况

介绍了常用压缩机在西气东输和陕京一线上的使用情况,并对不同管线应用的压缩机型号、运行参数、检测标准、压缩机的维护保养以及在线监测系统等方面进行分析。     

氯气离心式压缩机振动信号监测与分析

针对国内氯碱企业关键设备氯气离心式压缩机的运行时振动状况，利用频谱检测装置即时采集振动信号进行监测与分析。     

DHP45型离心压缩机振动原因分析与改进

通过对可能产生离心压缩机振动异常的情况进行的分析,找到了造成DHP45型离心压缩机振动异常的原因.利用更换可倾瓦轴承的办法,解决了离心空气压缩机的振动问题,达到了稳定运行的目的.     

输送天然气用球阀及油品管路用平板闸阀

叙述了输送天然气管路用球阀和输送油品管路用平板闸阀的设计和制造标准、材料及结构特点。     

极大流量工况下离心泵内部流场数值分析

针对离心泵极大流量工况下内部流动特性的问题,应用流体动力学软件Fluent,采用RNGκ-ε湍流模型与SIMPLEC算法,对某一高比转速离心泵内部流场进行了数值模拟,并与实验结果进行了比较。对比分析了4种不同流量工况下离心泵内部流体速度和压力分布以及离心泵的外特性。研究结果表明,在设计流量工况下,离心泵内部压力分布均匀,速度迹线平滑;较大流量工况下,蜗壳压力不断减小,速度分布不均匀;极大流量(1.7Qopt)工况下,蜗壳出口处出现局部负压现象,速度流线产生的漩涡增大,在扩散管局部位置流体受到冲击,容易出现回流现象。针对离心泵在不同工况下以及达到极大流量工况下内部流动随流量变化规律的研究,可为高比转速离心泵多工况优化设计、延长使用寿命提供参考。     

离心压缩机级的数值试验及分析

在自行开发的离心压缩机建模参数化软件平台上，对含分流叶片的离心压缩机级进行了数值试验，给出了级的总性能曲线和叶轮出口流场分布等结果。结果表明：离心叶轮分流叶片的位置、叶片出口的形状、扩压器宽度，以及蜗壳型式等方面的不同选择都会对压缩机的性能造成明显的影响。     

离心式压缩机的喘振分析与控制

利用离心式压缩机性能曲线及管路特性曲线的特点，结合加氢装置解析气压缩机实际情况，对离心式压缩机的喘振现象进行分析，并提出了防喘振措施。