精氩塔余气放空管道堵塞处理

在空分设备停车期间,因精氩冷凝器内存有液氮,造成精氩塔氩侧产生负压,使湿空气通过余气放空管道进入精氩塔,水分在低温处结冰后冻堵余气放空管。介绍处理措施和故障处理时的注意事项,并提出了防范措施。     

精氩冷凝器堵塞原因分析及处理

简介KDONAr-10000/20000/350型空分设备制氩系统流程以及精氩冷凝器堵塞现象,分析认为精氩冷凝器液氮侧压力控制过低,导致液氮节流降压后温度过低,使氩通道侧的氩冻结成固体而堵塞冷凝器。用来自下塔的中压氮气对精氩塔进行加温后,排除了故障,制氩系统投入正常运行。     

精氩塔废气管堵塞故障的处理

文章探讨了精氩塔废气管被堵塞的机理,介绍了故障的处理方法及防范措施,最后提出了精氩塔的操作及工艺改进设想。图1。     

氩过冷器通道堵塞分析及处理

详细介绍了氩过冷器通道堵塞引起精氩塔下部冷凝蒸发器的底部液位持续增高的现象及过程 ,分析了氩过冷器通道堵塞的原因 ,最后 ,介绍了解决故障的方法     

消除氩固化 提高氩产量

通过调整精氩塔的工艺参数 ,彻底解决了精氩塔的氩固化问题 ,稳定了制氩系统的运行工况 ,提高了氩产量     

20000m~3/h空分设备制氩系统故障分析与操作优化

在马钢20000 m~3/h空分设备开车、运行过程中,空分设备制氩系统发生了粗氩塔氮塞、循环粗氩泵自动停机、粗氩产量降低等故障,分析原因并介绍了处理措施和效果,叙述精氩塔投运时存在的问题与优化操作方法。     

一起珠光砂泄漏导致制氩系统工况恶化的故障分析及处理

由于冷箱内分析仪表管断裂导致珠光砂侵入精氩塔,而使循环液氩泵过滤网堵塞,引起制氩系统工况恶化。分析了故障原因,采取了相应措施后制氩系统恢复正常运行。     

工艺氩换热器堵塞原因分析和处理

KDON-10000／20000-Ⅰ型空分设备氩纯化系统自动放空阀V2104开启放空，液氩产量不断减少，影响了整个制氩系统的稳定生产，而空分设备又不能即时停车检修。在线对故障原因进行了分析，停运精氩塔，对堵塞的工艺氩换热器进行加热处理，空分设备恢复正常运行工况。     

工艺氩换热器堵塞原因分析和处理

KDON-10000/20000-Ⅰ型空分设备氩纯化系统自动放空阀V2104开启放空,液氩产量不断减少,影响了整个制氩系统的稳定生产,而空分设备又不能即时停车检修。在线对故障原因进行了分析,停运精氩塔,对堵塞的工艺氩换热器进行加热处理,空分设备恢复正常运行工况。     

通钢20000m~3/h空分设备制氩系统工况调整与优化操作

简介了通钢20000m3/h空分设备制氩系统的流程,就制氩系统投运过程中,氩馏分氩含量的调整、粗氩塔和精氩塔的投运时机及工况调整进行了详细分析,阐述了投运过程中的一些优化措施。     

故障矢量诊断法

本文基于振动故障信息的矢量特征，提出故障矢量诊断法用于诊断转子类故障，并解决信号处理中产生的问题，文中列举了两个诊断实例，诊断结果表明：故障矢量诊断法是转干系统故障的定量、定位诊断的有力工具。     

Investigation of Bearing Fault Diagnosis Based on Explicit Dynamics Analysis in ANSYS/LS-DYNA

In this paper,deep grove ball bearing GB6206 has been chosen as research object,and the explicit dynamics analysis method in ANSYS / LS-DYNA has been used to study features of fault bearing which with a tiny pit in the inner ring raceway. In the process of building this bearing FEM,the following parameters have been well considered,such as boundary conditions,friction,contaction,loads and so on. Through simulation,the corresponding equivalent stress nephograms and acceleration of nodes on the inner ring raceway has been obtained. According to features of acceleration which occurs neighbor to fault pit,bearing' s fault diagnosis has been realized. This paper provides a new way in monitoring bearing status and diagnosing fault of bearing.     

A method for evaluating fault coverage using simulated fault injection for digitalized systems in nuclear power plants

The fault coverage for digital system in nuclear power plants is evaluated using a simulated fault injection method. Digital systems have numerous advantages, such as hardware elements share and hardware replication of the needed number of independent channels. However, the application of digital systems to safety-critical systems in nuclear power plants has been limited due to reliability concerns. In the reliability issues, fault coverage is one of the most important factors. In this study, we propose an evaluation method of the fault coverage for safety-critical digital systems in nuclear power plants. The system under assessment is a local coincidence logic processor for a digital plant protection system at Ulchin nuclear power plant units 5 and 6. The assessed system is simplified and then a simulated fault injection method is applied to evaluate the fault coverage of two fault detection mechanisms. From the simulated fault injection experiment, the fault detection coverage of the watchdog timer is 44.2% and that of the read only memory (ROM) checksum is 50.5%. Our experiments show that the fault coverage of a safety-critical digital system is effectively quantified using the simulated fault injection method.     

制冷系统泄漏的原因分析与处理办法

制冷系统泄漏是空调制冷设备运行中较为常见的故障,一旦发生不仅会影响设备的正常使用,而且还可能造成压缩机的严重故障,从制冷系统的密封方式入手,分析了导致制冷系统密封失效的原因,以及不同工况下制冷系统泄漏的判断方法,在此基础上提出了一种处理制冷系统泄漏故障的作业方法及作业程序。     

基于知识的卫星故障诊断与预测方法

卫星结构的复杂性、运行环境的独特性和诱发故障的多源性，使得卫星故障的诊断与预测较一般设备困难。通常，一种形式的推理只能诊断和预测卫星的一类故障。文章提出了同时应用多种形式推理进行卫星故障诊断和预测的新方法，此方法已成功地应用于基于知识的卫星故障诊断与恢复系统的开发，并取得了显著的效果。     

Simulation of fault rupture process by the stochastic finite element method

It has been shown that the finite element method which utilizes the joint element for representing the fault plane is a promising tool to analyse the fault rupture process and to predict the near field ground motion. In such analyses, however, the spatial distribution of stress and strength along the fault must be known and has been assumed to be deterministic. Then, as a next step of the analysis, the spatial distribution of stress and strength on the fault are considered to be random variables and the effects of spatial variation are discussed by making use of the Monte Carlo simulation and the first-order approximation method.     

An analytic solution for a fault tree with circular logics in which the systems are linearly interrelated

A circular logic or a logical loop is defined as the infinite circulation of supporting relations due to their mutual dependencies among the systems in the fault tree analysis. While many methods to break the circular logic have been developed and used in the fault tree quantification codes, the general solution for a circular logic is not generally known as yet. This paper presents an analytic solution for circular logics in which the systems are linearly interrelated with each other. To formulate the analytic solution, the relations among systems in the fault tree structure are described by the Boolean equations. The solution is, then, obtained from the successive substitutions of the Boolean equations, which is equivalent to the attaching processes of interrelated system's fault tree to a given fault tree. The solution for three interrelated systems and their independent fault tree structures are given as an example.     

Application of the fault tree analysis for assessment of power system reliability

A new method for power system reliability analysis using the fault tree analysis approach is developed. The method is based on fault trees generated for each load point of the power system. The fault trees are related to disruption of energy delivery from generators to the specific load points. Quantitative evaluation of the fault trees, which represents a standpoint for assessment of reliability of power delivery, enables identification of the most important elements in the power system. The algorithm of the computer code, which facilitates the application of the method, has been applied to the IEEE test system. The power system reliability was assessed and the main contributors to power system reliability have been identified, both qualitatively and quantitatively.     

TAE-100M/30型空压机异常卸载研究

TAE-100M/30型空压机采用的QUDA2000 PLC控制系统,多次引发空压机喘振卸载,对空压机的稳定运行造成很大影响,经过分析及试验逐步排除设备故障因素,解决了由于信号干扰引起的控制系统故障,实现空压机稳定运行。     

Research on the Information Fusion Method of Oil Diagnosis and Vibration Diagnosis Based on the Rough Sets Theory

The improved method has been presented for knowledge reduction in rough sets （R-S） theory, when R-S is used to model the information expression of oil and vibration diagnosis. Therefore, the typical fault simulation tests of rolling bearings have been made, and the application method of R-S has been also analysed in this paper. The diagnosis model of holding rack fault in rolling bearing was presented based on the improved reduction method. It is suited to information fusion to combine information when oil analysis and vibration analysis are combined for fault diagnosis.