生物质热解液化装置中分离器及输送管道的设计

对液化装置中的分离器与输送管道的设计和选型进行了分析,介绍了旋风分离器的工作原理,给出了分离器的主要设计参数,提出了一套理想可行的设计方法和思路,并对设计的旋风分离器和输送管道进行了实验研究,其结果表明分离效果良好,完全符合本中心设计的生物质闪速热解液化装置的工作要求。同时,对输送管道进行了设计说明。     

粘土粉负压吸送常见故障及处理

粘土粉负压吸送装置如图所示。依靠真空泵10在整个输送管道系统中产生的负压真空气体,通过吸笼2使粘土池1中的粘土粉与负压气体充分混合,形成物质流而被输送。混合气流通过一级旋风分离器5、二级旋风分离器7分别进行一、二级分离,从混合气流中分离出来的粘土粉分别经由两级分离器下部的星形卸料器中排出,直接进入粘土仓6中。经过两     

基于CFD技术的旋风分离器减阻性能研究

利用雷诺应力模型对旋风分离器气相流场进行数值模拟研究，在此基础上对安装在旋风分离器排气芯管下口的双进口螺旋减阻装置进行了研究，并通过与直径为205mm的Stairmand旋风分离器和直径为150mm的Bohnet型旋风分离器的试验数据进行比较，结果表明，减阻装置可以使排气管下口切向速度降低，内外漩涡交接面半径明显外移，合理改变旋风分离器内部压力分布，能有效降低旋风分离器的压力损失35％以上。研究结果还表明，旋风分离器数值模拟结果和试验数据吻合较好，应用计算流体动力学（CFD）来研究旋风分离器性能方便且可行。     

切流返转式旋风分离器设计方法的探讨

旋风分离器可以利用气态和固态两相流体之间的高速旋转运动,在离心力的作用下将固体颗粒从气流中分离出来。由于旋风分离器的结构简单、操作方便、价格低廉、设备紧凑、维修方便、无相对整体运动的部件,而且可以用于生态环保等行业里的分离与除尘装置,因此旋风分离器被广泛地应用在能源、化工、矿山、建材、食品、炼油等方面。本文探讨了切流返转式旋风分离器设计方法。     

旋风分离器内速度场的数值模拟研究

为了研究旋风分离器内流场的运动状况,借助Fluent软件,采用大涡模拟,基于曲线坐标系的SIMPLEC算法,对切向入口的Stairmand旋风分离器内速度场进行三维数值模拟研究。通过数值模拟,得到旋风分离器内的切向速度、轴向速度及径向速度的分布规律,为今后充分认识和设计旋风分离器提供一些有意义的参考和理论指导。     

PV-E型旋风分离器性能试验研究

在PV型旋风分离器流场和浓度测定的基础上，分析了影响分离性能的主要因素。通过采用分流型排气管、预排尘结构以及优化高径比等措施，开发出了一种压降更低、效率更高的PV—E型旋风分离器。冷态试验结果表明，与PV型旋风分离器相比，PV—E型旋风分离器的出口浓度和压降分别降低约10％和20％。PV—E型旋风分离器的优良性能也得到了放大试验和实际应用的证实。     

电石渣旋风分离器的设计及仿真

采用旋风分离器分离提纯电石渣中Ca(OH)2,设计了符合电石渣特性的旋风分离器,并使用Fluent软件平台,采用雷诺系数模型(RSM)以及DPM模型,对分离器内部流场进行仿真模拟,分别从速度、压力、湍流强度等方面分析。结果表明:以临界粒径为切入点,设计的旋风分离器,内部具有稳定的流场;在不大于46μm区度范围内,电石渣Ca(OH)2含量较高的颗粒可以得到集中收集,而大于46μm含杂质较多的电石渣颗粒得到集中处理;使用旋风分离器能够提纯出电石渣中的Ca(OH)2,以及达到预期的提纯目的。     

旋风分离器的设计探讨

探讨在设计用于BOPP等生产线的供料系统上使用的旋风分离器时，选取适当的临界粒径，使旋风分离器既能将原料分离下来，又可将细小的尘粒排走，减少原料的含尘量，有利于生产线正常生产。     

炼油装置旋风分离器结构的CFD优化

旋风分离器在炼油装置中的应用极为广泛,对旋风分离器的结构进行优化,使之达到最佳的操作性能是研究人员一直努力实现的目标。采用CFD软件分别从排气管直径、排气管插入深度、筒体圆柱段长度等多个方面来对炼油装置中的某个旋风分离器结构进行优化,以便能够提高旋风分离器的性能。     

Aspen Plus软件在旋风分离器设计中的应用

旋风分离器是工业中应用最广泛的分离设备之一,相关的分离效率和压降的计算模型很多。采用Aspen Plus软件,选择合适的模型,可快速、高效、准确地实现旋风分离器模拟设计。     

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.     

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。     

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....     

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.