核电站用GroE型铅酸蓄电池国产化探讨

本文旨在探讨Gro E型铅酸蓄电池国产化的必要性、可行性及意义。GroE型铅酸蓄电池作为核电站备用电源设备之一,对于核电站的安全运行有着至关重要的作用。鉴于当前的国际形势,设备的国产化尤其是核级设备的国产化已经成为一个重要的话题。本文将分析Gro E型铅酸蓄电池国产化的必要性,从技术、材料、设备、工艺及人员等方面评估其实施的可行性,并探讨其国产化意义所在。     

石化技术发展方向

我国石油化工技术发展方向是,为30万t/a乙烯扩能到60万t/a提供国产化技术,包括大型裂解炉、乙烯分离工艺包和重大设备的开发。开发新一代聚烯烃技术,主要是气相法聚乙烯催化剂冷凝工艺,完成聚丙烯环管法工艺均聚和共聚技术国产化,开发生产不造粒树脂技术、金属茂催化剂技术、双峰分子量分布的聚乙烯树脂合成技术和催化合金技术石化技术发展方向     

大型国产化罩式炉群的管理与实践

介绍了柳钢国产化罩式炉群的基本情况,并从炉区生产组织优化、退火工艺优化、设备管理优化三方面介绍了国产化罩式炉群的生产管理实践和生产指标的优化方法。     

高温高浓度SO_3风机技术关键及国产化分析

分析了双闪炼铜工艺中Outokumpu Technology高浓度二氧化硫转化技术的SO3风机的技术特点、技术关键与存在不足、风机国产化的可行性,为SO3风机国产化提供依据与指导.     

风缸底盖焊缝开裂原因分析及解决措施

介绍了动车用解钩风缸的国产化背景，以及国产化气缸底盖过程中遇到的焊缝开裂问题。并针对气缸底盖焊缝开裂问题进行研究，分析原因，并从焊接材料、焊接结构及焊接工艺等几个方面提出改进措施，最后完成气缸底盖的国产化过程。     

大型进口压缩机活塞杆与十字头法兰拆卸工具及备件国产化改造

阐述了2台进口压缩机的活塞杆及拆卸工具的国产化改造过程中遇到的问题及详细的解决方案,拉伸螺栓采用了特殊的热处理工艺提高材料性能,国产化改造成功,为进口压缩机关键零部件的国产化提供了可靠的技术储备。     

HXN5主辅发电机磁极线圈匝间绝缘漆的国产化工艺研究

HXN5型机车主辅发电机磁极线圈匝间绝缘漆的主要作用,是将磁极导线匝间绝缘与线圈各匝黏结起来,形成一个整体。为实现该种材料的国产化,分析研究了该匝间绝缘漆绝缘性能和相关参数,筛选并确定国产化材料,在此基础上进行工艺研究和验证试验,通过性能测试,结果表明实现了国产化材料替代的目标。     

底漆国产化工艺研究

底漆国产化是一项长远的、对工厂降本增效能够起到一定作用的有意义的工作。本文从工艺的角度说明了底漆国产化工作的可行性，重点对国内的三家油漆厂家的油漆在相互之间的配套，实验结果以及价格方面做了比较，力求这项工作能顺利进行。     

苯乙烯装置SMART反应器制造

对苯乙烯装置SMART反应器国产化制造进行了详细的阐述，重点介绍了304H钢的采购技术指标、材料到货检验及复验、304H焊接工艺试验以及上、下封头制造及机械加工、三圈栅网到货检验、反应器和三圈栅网现场安装及检验。通过采取合理的焊接、热处理、机械加工及安装工艺，成功地完成苯乙烯装置SMART反应器国产化制造，制造质量完全满足国外工艺条件及设计图样要求。     

沈鼓中标世界最大Lummus工艺丙烷脱氢制丙烯项目

正2021年1月,福建美得石化有限公司90万吨/年丙烷脱氢制丙烯(PDH)项目配套的产品气压缩机组、丙烯压缩机组、乙烯压缩机组确定选用沈阳鼓风机集团股份有限公司的产品。该项目采用Lummus工艺,是目前全球应用这一工艺的同类最大装置。该项目的成功中标,实现了沈阳鼓风机集团股份有限公司在该领域Lummus工艺配套压缩机组国产化的重大突破,推动了丙烷脱氢制丙烯(PDH)行业Lummus工艺流程配套压缩机组全部实现国产化的进程,     

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.