基于MCGS的生物质锅炉运行远程监控系统设计

针对生物质燃料锅炉系统多输入多输出的复杂动态特性,提出了一种生物质锅炉运行远程监控系统。通过运用MCGS组态技术和DDE技术,进行MCGS与MATLAB的数据通信,实现了锅炉现场的动态数据采集、实时监控以及生物质燃料锅炉控制系统的优化控制研究。系统具有控制精度高、实时监控、良好人机对话、组态图形清晰直观的特点,有效保证了生物质燃料锅炉经济安全稳定运行。     

自动控制技术在宣钢160t/h锅炉中的应用

介绍了宣钢160t/h中温中压燃气式锅炉的工艺和自动控制系统的构成及控制方式,锅炉本体采用了ABB公司的DCS控制系统完成了宣钢160t/h锅炉给水系统、燃烧系统、风烟系统等各子系统的控制功能,并重点阐述了中温中压燃气式锅炉给水自动控制的设计和实现。     

模糊PID控制在锅炉燃烧系统中的应用

针对目前锅炉存在的能耗高、燃烧不完全、污染环境、热效率低的缺点,设计了一种新型锅炉燃烧系统.该系统采用PID串级和Vague集分时控制,有效地提高了锅炉控制质量.     

基于大数据的动态风险监视系统开发与测试

为解决火力发电厂锅炉受热面管状态监测及管控难题,实现锅炉受热面管的精准检修,降本增效,设计了一套锅炉受热面管动态风险评估系统。本文从受热面管的炉外壁温数据分析技术、炉内壁温模拟计算、半定量寿命评估技术、热偏差分析技术以及堵管分析技术等专业方向入手,基于火力发电厂DCS系统和SIS系统的大数据,建立数据库,动态分析各参数发展趋势,实现了锅炉受热面管超温预警和风险寿命动态评估。该技术对于电厂锅炉运行人员具有极大的指导作用,对于电站锅炉风险控制技术研究有极大的借鉴意义。     

DCS在锅炉自动控制系统的应用

DCS系统作为自动化控制系统的重要应用,被广泛应用。在锅炉的自动化控制系统中,DCS的应用越来越多。介绍了DCS锅炉系统控制的硬件配置,功能,阐述了锅炉燃烧控制系统,流量控制系统,以及安全保护等方面的应用。为研究DCS系统在锅炉自动化控制提供一定的借鉴。     

循环流化床锅炉控制系统

循环流化床锅炉是一个分布参数、非线性、时变、大滞后、多变量紧密耦合的被控对象,常规控制方法难以取得理想的控制效果。首先介绍了影响循环流化床锅炉控制的主要因素,分析了被控对象的特点。然后对主汽压力调节系统,一次风量调节系统,二次风量调节系统,引风量调节系统,给水调节系统,主汽温度调节系统这些主要回路的控制进行了讨论。最后介绍了炉膛安全保护系统以及锅炉的顺序控制和保护。     

高压变频器在国电乌斯太热电厂引风机上的应用

本文介绍了风光牌高压变频器在乌斯太热电厂锅炉引风变频系统中的应用情况,阐述了变频调速系统的实现机理、功能及特点,对节能效果进行了分析。从全新的角度,诠释了高压变频调速系统与现场DCS系统的高效对接,增强了锅炉引风系统的自动化性能。     

浅谈企业重视锅炉安全管理的重要性及措施

本文对锅炉的重要性进行了系统的分析,明确锅炉运行、维修、经济节能的重要性,笔者结合自身实际工作和经验,阐述了锅炉的安全运行的管理几点措施。     

变频技术在锅炉机电一体化节能系统中应用

随着社会的快速发展,我国的各个领域都通过与科学技术手段的结合,实现了现代化的改革。与此同时,人们生活水平的不断提高也使其对资源的需求量提出了更高的要求,传统的锅炉不仅已经无法满足当前社会的发展需求,甚至已经无法实现人们日常生活中的实际需要。因此,实现对锅炉的改革和发展,已经成为了锅炉企业在发展过程中的首要任务。其中,锅炉机电一体化节能系统作为当前的新型锅炉系统,在传统锅炉的基础上,通过与机电一体化的有效结合,成为了促进锅炉企业发展的核心模式。     

WSN中基于灰靶理论的锅炉泄露状态评估

针对电厂锅炉泄露状态评估问题,提出一种锅炉状态的在线识别评估方法。该方法将灰色系统中的灰靶理论引入到电厂锅炉泄露状态评估中,首先设计一种基于ZigBee的电厂锅炉在线监测系统;然后将监测到的泄露气体数据进行分析,给出锅炉泄露状态评估的算法步骤;最后根据锅炉状态按泄露程度的不同给出锅炉分级的方法,来预测其锅炉泄露的状态。实验表明,提出的方法能够有效地解决在没有标准故障模型的情况下锅炉状态识别的问题,为锅炉状态评估提供了一种新途径。     

System reliability analysis of an N-version programming application

This paper presents a quantitative reliability analysis of a system designed to tolerate both hardware and software faults. The system achieves integrated fault tolerance by implementing N-version programming (NVP) on redundant hardware. The system analysis considers unrelated software faults, related software faults, transient hardware faults, permanent hardware faults, and imperfect coverage. The overall model is Markov in which the states of the Markov chain represent the long-term evolution of the system-structure. For each operational configuration, a fault-tree model captures the effects of software faults and transient hardware faults on the task computation. The software fault model is parameterized using experimental data associated with a recent implementation of an NVP system using the current design paradigm. The hardware model is parameterized by considering typical failure rates associated with hardware faults and coverage parameters. The authors results show that it is important to consider both hardware and software faults in the reliability analysis of an NVP system, since these estimates vary with time. Moreover, the function for error detection and recovery is extremely important to fault-tolerant software. Several orders of magnitude reduction in system unreliability can be observed if this function is provided promptly     

麦基嘉克令吊电气控制系统常见故障诊断与排除

麦基嘉克令吊电气控制系统相对复杂, 在使用中一旦发生电气故障, 会导致其无法正常工作, 容易耽误船 期。在简要介绍电气控制系统的基础上, 结合在实船工作经历中成功解决电气设备故障的经验, 分析了控 制系统中常见的启动回路故障、电源故障、限位回路故障以及手柄逻辑错误故障等产生原因、诊断思路和 排除方法, 为麦基嘉克令吊电气控制系统常见故障诊断与排除提供一定参考。     

Fault-Tolerant System Using 3-Value Logic Circuits

A ternary decision circuit implemented in CMOS technology is proposed. It can be used in a duplex binary fault-tolerant system to replace both the matcher and the switch circuit. The resultant system is simpler than the conventional one. The reliable design of the ternary decision circuit is discussed in detail. A duplex 2-of-3-value fault-tolerant system can be formed by two 2-of-3-value processors and a TDC. This system is more powerful than a duplex binary system since it can provide automatic error correcting function for certain faults. All single faults can be divided into self-checked faults and secure faults. For any self-checked faults, the TDC is self-testing, strongly fault secure, and totally self-checking. For any secure faults, the TDC is strongly fault secure.     

Design and implementation of a fault-tolerant magnetic bearing system for turbo-molecular vacuum pump

One of the obstacles for a magnetic bearing for use in a wide range of industrial applications is the failure modes associated with magnetic bearings, which are not expected for conventional passive bearings. These failure modes include electric power outage, power amplifier faults, position sensor faults, and the malfunction of controllers. Fault tolerant magnetic bearing systems have been proposed so that the system can operate in spite of some faults in the system. In this paper, we describe the design and implementation of a fault tolerant magnetic bearing system for a turbo-molecular vacuum pump. The system can cope with actuator/amplifier faults, as well as faults in position sensors, which are the two major fault modes in a magnetic bearing system.     

The effect of compensating faults models on NMR system reliability

Realistic estimates of the reliability of systems with N-tuple modular redundancy (NMR), must consider the effect of compensation of logic faults. Earlier analyses that include compensating faults are impractical to use, yield very complex mathematical formulas for reliability indices, and/or concern the simplest triple modular redundancy (TMR) system only. This paper gives a general approach to the problem. Two models of compensating faults are considered. For either model the lower and upper bounds on frequency of compensating faults are found. By applying some results of NMR system evaluation, the new estimates of upper and lower bounds of NMR system reliability with respect to compensating faults are derived. A simple algebraic form of the final results makes them useful     

A Fault Tolerant Memory For Duplex Systems

A fault-tolerant memory design uses modular bit swapping to achieve high system availability with minimum redundancy despite high memory-device failure rates. The design permits automatic repair of multiple faults without loss of error detection, thereby allowing deferral of manual repair. Although the design was directed toward use in a duplex system, the technique potentially applies to simplex systems. Double-bit swapping and 4096-word modules were chosen for this system. With a 64k memory, 18 memory device faults would occur in its 40-year life. The number of instances of manual repair will average 3; the number of faults in the system when manual repair is required will average 6. Similarly, with a 1024k memory, 288 memory faults would occur in its 40-year life. The number of instances of manual repair will average 20 and the number of faults in the system when manual repair is required will average 14.     

Hardware implementation of fault tolerance NoC core mapping

Due to performance and reliability, network on chip (NoC) is considered to be the future generation interconnect technique for multiple cores in a chip. This paper proposes a system level core mapping technique which improves the performance of the whole system, while rectifying the temporary faults and permanent faults in the system using error correcting codes and spare core. This technique mainly focuses on the core mapping and faults on the system. This results in reliable core mapping and improved performance when a fault-related error occurs on an NoC. At last, the proposed core mapping technique is simulated and verified on FPGA board (Kintex-7 FPGA KC705 Evaluation Kit).     

PC机显示器电源典型故障及检修方法

PC机显示器的开关电源最容易出现故障,其故障率约为整机故障的70%左右。文中首先介绍了PC显示器开关电源的基本工作原理及其故障检修的思路,然后详细分析了显示器开关电源的典型故障及其检修方法。     

短信在基站监控的应用

针对通信基站监控系统的长期运行中所存在的问题,结合公司出品的短信监控系统的三年实践,提出基站监控信息自动分配到目标用户的办法,使监控值班中心从信息传递链中撤出,实现通信基站从“无人值守”到“无人值班”的跨越。     

Autonomous Fault-Tolerant Systems onto SRAM-based FPGA Platforms

This paper presents an approach for increasing the lifetime of systems implemented on SRAM-based FPGAs, by introducing fault tolerance properties enabling the system to autonomously manage the occurrence of both transient and permanent faults. On the basis of the foreseen mission time and application environment, the designer is supported in the implementation of a system able to reconfigure itself, either by reloading the correct configuration in case of transient faults, or by relocating part of the functionality in presence of permanent faults. The result is a system implementation offering good performance and correct functionality even when faults occur. The proposed approach is evaluated in a case study to highlight the overall characteristics of the final implementation.