直流系统绝缘监测装置的改进研究

直流系统绝缘监测装置对电力系统的安全稳定运行起着十分重要的作用.通过对直流系统绝缘监测原理优缺点的分析,提出了一种平衡电桥与开关电阻相结合的新型直流系统绝缘监测装置设计方案,设计母线电压检测电路和支路漏电流采集模块分别监测母线和支路的绝缘状态.采用STM32系列单片机作为主控MCU和采集MCU,建立了一种分散式模块化的多控制器绝缘监测结构.同时对直流系统绝缘监测装置的软硬件部分进行了详细的设计,并研制成样机,在多种接地状态下验证了装置接地电阻测量、支路定位和故障报警的准确性.     

烟气轮机热态机械运转试验监测系统的建立与应用

中国石油兰州石化公司为满足烟气轮机出厂检验要求,建立了烟气轮机热态机械运转试验状态监测系统。介绍了状态监测系统的总体设计方案,分析了试验台硬件的选型配置和机构运转试验采集点分布设计。状态监测系统建成后,已完成20余种烟气轮机试验,为产品出厂提供了质量保证。     

内燃机车柴油机增压器故障的早期判断

对内燃机车增压器故障的原因进行了分析,论述了增压器故障与其转速的内在联系,阐述了开发增压器状态在线监测装置的可行性、必要性;介绍了增压器状态在线监测装置的基本结构、工作原理、性能等。     

矿用刮板输送机动力系统智能监测及故障报警分析研究

矿用刮板输送设备减速器润滑油温度、冷却水温度、减速器输入输出轴温度、振动等信息关系着设备的使用寿命及井下开采的安全性与开采效率。动力部监测及故障报警分析装置研究迫在眉睫,研发煤矿智能化监测监控装置,对工作面刮板输送设备工况运行参数数据采集,并通过软件算法分析减速器、电机振动数据、振动频谱、不同干扰源下的振动情况,通过监控终端直观的反映各工况信息、设备故障报警信息及时分析处理减速器、电机振动故障,监测系统与无线传感器、综采工作面5G通讯相结合,使得智能开采设备功能更完善。     

架空输电线路过电压在线监测系统

现有的过电压在线监测装置主要是针对变电站内的电气设备进行设计的,然而架空输电线路上的过电压与变电站内的过电压,其波形和幅值差异较大。同时,现有的故障录波器受自身功能的限制,不能对快速变化的过电压进行数据采集。因此提出了一种架空输电线路过电压在线监测系统,并对该在线监测系统进行硬、软件设计,分析了各部分组成结构和工作原理,同时提出了软件设计思想和运行流程图。对该装置进行性能测试,结果表明该在线监测系统在工频和冲击电压下,传感器测量精度高,嵌入式监测装置数据采集和储存可靠,与地面工作站通讯良好。     

贾汪PFBC中试电站烟气旁路减温减压

贾汪PFBC-CC燃煤联合循环发电中试电站的烟气旁路系统是机组启动或烟气轮机甩负荷和发生故障时高温高压烟气的安全通道,旁路中的减温减压装置是其     

TH-DMDS型电力设备局部放电监测诊断系统

介绍了TH-DMDS型电力设备局部放电在线监测与诊断系统。该系统为固定式装置,能够在电磁干扰较强的变电站环境下稳定运行,可全天候连续在线监测电力设备的故障放电信号,为电力现场及时发现设备故障隐患,为电力系统安全运行提供了保障。     

变电站电气设备故障类型分析与监测系统设计

深入分析了变压器、断路器等一次设备的故障类型和原因。从电气设备的故障监测背景出发,重点对变压器、断路器故障监测进行分析研究,并且给出了变压器的故障类型树。通过分析国内外近年来故障监测的发展状况,对变压器和断路器设计了故障监测系统,并分析了如何利用监测收集的数据对电气设备进行故障诊断,从而实现变电站故障的实时监测,防止电气设备故障的进一步扩大。     

风电场集电线路状态监测一体化装置

本文介绍了一种适用于风电场集电线路状态在线监测的一体化装置,论述了线路状态监测的传感器工作原理及行波故障监测原理,该装置采用模块化设计,集线路状态监测、故障测距于一体,各项功能均能相互配合。利用大量现场运行数据证明,该一体化监测装置应用于集电线路状态监测具有良好的适应性及线路状态监测的稳定性。     

JK00430型机车走行部车载监测装置常见故障的原因分析及其处理

简述了JK00430型机车走行部车载监测装置的功能和特点,针对该装置运用中的故障现象进行了分析,并提出处理方案。     

小型锅炉烟尘测试时锅炉出力的计算

锅炉烟尘测试时,必须对锅炉出力进行测试。但监测中,许多小型锅炉往往不具备相关的计量装置和仪表,为解决这一问题,文章提出了用烟气量和空气过剩系数来计算锅炉的出力的公式,在实际使用中,该方法简单易行,其结果和实测值具有很好的一致怀。     

Unerroric of control of mutual compliance of the efficiency of hydrogen engines of unmanned vehicles in the conditions of mass production

The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO₂ and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized.     

中国煤炭地下气化技术的发展

本文综述了煤炭地下汽化技术的国内外发展现状,对我国“长通道、大断面”煤炭地下气化新工艺给予了技术经济评述,并提出了发展煤炭地下汽化技术的政策建议。     

Review of theory of distortion and disintegration of liquid streams

Linear and nonlinear analyses of the instabilities and distortion of liquid streams injected into a gaseous media are discussed. The various fundamental mechanisms and the predictive capabilities for the distortions are emphasized. Round jets, planar sheets, annular sheets, and conical sheets are discussed in detail. The balance between capillary and inertial forces is primarily examined. The method for simplifying the analyses in the case of thin liquid sheets is discussed. The capabilities for representing the droplet size distribution that follows the stream disintegration are outlined.     

机车车轮多轴疲劳强度安全评定的研究

使用ANSYS8.0软件对高速列车车轮进行了三维有限元分析,计算出车轮在直线、曲线和道岔条件下牵引、制动共6种工况时孔边薄弱部位的应力,分别通过Mises等效平均应力方法、Sines平均主应力方法和应力分量中考虑平均应力方法计算出应力在极值位置时的等效应力幅、等效平均应力,从而进一步算出车轮的安全系数,对其疲劳强度进行评定,并对3种方法进行了比较研究。     

Constructal optimization of the geometry of an array of micro-channels

This paper documents the geometric optimization of an array of circular and non-circular ducts. The optimization was carried out numerically using finite volume method. As optimal dimensions were independent of the array configuration, the numerical simulation was performed on a unit cell. Numerical optimization for circular, square and isosceles right triangle cross-sections of channels was performed. Based on the results of this investigation, some correlations were proposed to predict the optimal hydraulic diameter and dimensionless heat transfer per unit volume. In addition to examining the effect of pressure drop on these parameters, it was showed that among the different geometries of this study, square cross-section has the most efficiency for a given volume. The numerical results of the present study were compared with approximate results reported in the literature which a good agreement was observed.     

MgO膨胀剂细度对MgO水化和水泥浆体膨胀的影响

基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁（MgO）,研究了该型MgO膨胀剂（MEA）细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析（TG DSC）分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45 μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。     

固体热辐射Yong性能分析

本文对漫灰均温物体在常物性条件下对外辐射传热的Ｙｏｎｇ值计算建立了数学模型。通过与物体内能Ｙｏｎｇ公式的数值计算比较,得出了辐射能量的Ｙｏｎｇ值不大于内能Ｙｏｎｇ值的结论。从初步的热射Ｙｏｎｇ值计算公式发现。Ｙｏｎｇ与物体表面辐射率有关。     

Measurements of concentration distribution of hydrogen jet using deflection of center of the laser spot

The main purpose of this work is to propose a new method to evaluate the concentration distribution of the hydrogen jet by using a He–Ne laser through the jet. This research attempts to apply the expression of concentration Gaussian distribution, the refraction formula of inhomogeneous refractive index medium, and the concentration inversion function to disclose the displacement of the center of the laser spot at different heights in the gas jet. The spot images of the laser beam passing through the gas jet at three vertical heights z = 10d, 20d, 30d, and different radial positions are obtained. The radial spatial asymmetry of the gas jet is also found in the experiment. Finally, the calculated concentration distribution curve and the fluent simulation curve, it is found that the two results are very similar. Our findings show that the error between the concentration distribution of this method and the simulated concentration distribution reaches 2.43%.     

汽轮机零件防锈性能的改善

介绍了汽轮机零件的封存特点、防锈要求及防锈油性能对比试验的方法,通过对试验结果的对比分析,客观验证了各种防锈油的性能。试验表明,只有选择了合适的防锈油,才能保证汽轮机零件长期封存的质量。