K102ABC新氢压缩机机组进气管线振动分析与整改

随着石化行业装置的大型化,多机组的往复压缩机的气流脉动和管线振动问题成为困扰整机安全生产的关键。本文对多机组大型往复式压缩机气流脉动和管线振动的分析方法、步骤及整改措施进行了阐述。利用DIGMO和CAESAR II分析软件对压缩机管线的振动进行综合分析,在设计阶段对产品质量进行预期计算,并给出整改方案。     

往复式压缩机可靠性参数化设计方法研究

为快速响应市场需求,以大型往复式压缩机关键零部件的设计选型问题为研究对象,基于可靠性理论和计算机三维建模技术,开发设计了往复式压缩机关键部件参数化设计平台,可以快速、准确得出设计所需的各项技术参数和各种分析曲线,快速构造产品模型,实现数字化设计和装配,并以实例研究分析了参数化选型设计对压缩机局部结构优化的作用,验证了优化后结构的合理性。对此类机械产品借助可靠性分析、参数化设计可提高设计质量和效率,从而提高产品的市场竞争力具有现实意义。     

超高压压缩机

发展经过过去十年中,在高压领域内,离心式压缩机已经向往复式压缩机提出挑战。由于对高压压缩机在容量、气量及功率的要求增长,也就是说,要建造更大的肥料(氨)厂,而且要求成本低,设备经济,因而促使离心式压缩机进入了迄今为止被认为是往复式压缩机所独占的领域。但是,还有一个领域仍由往复式占领。这就是很高压力的领域,本文取此压力平均高于1500巴(1巴=1.019公斤力/厘米~2—译注),而目前工业用往复式压缩机的上限,约为4000巴。     

产经要闻

杭氧签单神华集团4套6万空分装置；抚顺石化实现乙烯制冷压缩机的首台套国产化；哈电机研发出国内首台电站水轮机筒阀；中国减速机标准化技术委员会在泰隆筹建；全国大型石化装备国产化工作会议在沈阳召开     

往复式压缩机十字头轴瓦温度无线光纤传感在线监测机理

针对石化行业往复式压缩机十字头轴瓦温度在运动过程中难以监测的技术难题,结合往复式压缩机十字头往复运动的特点,提出了一种往复式压缩机十字头轴瓦温度无线光纤传感在线监测方法,研究了它的无线监测机理、方法及无线信号输出特性,结果显示采用该方法在20%的能量耦合效率时仍可以进行温度监测,表明该监测机理具有可行性。     

大型往复式压缩机组故障分析及预防措施

介绍了冀东油田南堡联合站大型往复式压缩机的常见故障原因及预防措施,并为保障大型往复式压缩机的安全运行提出了建议,为大型往复式压缩机的故障处理和运行管理提供了参考。     

行业动态

“锡压”首台国产化大型迷宫式压缩机将落户齐鲁石化 2003年7月5日,无锡压缩机股份有限公司与天华化工机械及自动化研究设计院共同开发的国家重大技术装备——大型迷宫式压缩机经三年的努力,终于花开蒂落。首台机中标石化     

国产首台大型迷宫压缩机诞生

列入“十五”国家重大技术装备研制项目与国债专项资金的大型迷宫压缩机在江苏省无锡压缩机股份有限公司研制成功。前不久，通过了由中国石化集团公司重大装备国产化办公室组织的产品出厂验收评定。首台国产机正式交付齐鲁石化新上马的72万吨／年乙烯改造工程配套项目使用。该产品填补了国内空白，其价格仅为进口设备的四分之一，从而打破了国外产品高价垄断石化市场的局面。     

往复式压缩机故障诊断方法研究综述

本文叙述了往复式压缩机故障诊断的意义及研究现状,对往复式压缩机常见故障及机理进行了分析,并介绍了国内外一些常见的往复式压缩机状态监测与故障诊断的方法及其原理和特点,最后提出了往复式压缩机的故障诊断方法的难点和发展方向,为从事该方面研究提供借鉴.     

首套国产化150万t/aPTA工艺空气压缩机组的设计开发及现场投运

对石化领域的PTA工艺空气压缩机组技术及现场运行情况进行了描述,通过对工艺流程、机组配置、现场运行的介绍,为大型PTA机组国产化提供了借鉴。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.