安全仪表系统的维修策略优化及应用

发布时间：2018-06-19 02:13

本文选题：安全仪表系统 + 维修性　；参考：《华北电力大学》2017年硕士论文

【摘要】：随着我国工业的发展与进步,工业设备呈现出大型化与智能化的发展趋势,在大型工业中,以维修性和可靠性为指标的安全仪表系统对大型工业设备正常运行有重要辅助作用。电力工业近些年也呈现出大型化与智能化的特点,高效安全的进行电力生产是安全仪表系统研究人员关注的问题。目前国内电力系统的维修策略大多是以定期维修为主,依据维修人员工程经验选定维修时间,此方法缺乏理论支撑,没有现场数据验证。基于状态的维修策略在军工,航天,石化领域应用比较广泛,但其在电力系统的应用不常见。本文首先对国内外的安全仪表维修策略的现状进行了分析与研究,针对安全仪表系统以及安全标准进行了一定的介绍,对比了三种安全仪表的维修策略,比如定期维修,基于状态维修以及可靠性的维修等,除此之外,选择火电厂主燃料跳闸中全炉膛灭火保护子功能和变电站仪器仪表系统中过电压、过电流跳闸子系统作为研究对象。为对上述系统进行研究,首先根据火电厂日常生产运行数据,利用安全性与可靠性理论,以IEC61508及IEC61511为原则,得出故障树模型并对系统进行安全评估进而得出安全完整性等级;其次,依据变电站仪器仪表系统实际特点,提出变电站定期维修策略,综合考虑可用性、可靠性、维修成本,应用多目标优化策略,使用遗传算法,得出了最优的维修间隔,为变电站检修工作提供参考意见。最后,经过对变电站和火电厂的安全评估以及维修策略研究,得出影响火电厂和变电站安全性的主要因素并指出改进方向。
[Abstract]:With the development and progress of China's industry, industrial equipment presents a trend of large-scale and intelligent development. In large-scale industry, the safety instrument system, which takes maintainability and reliability as the index, plays an important role in the normal operation of large-scale industrial equipment. In recent years, the power industry also presents the characteristics of large-scale and intelligent, efficient and safe power production is a safety instrument system researchers pay attention to. At present, the maintenance strategy of domestic electric power system is mostly based on periodic maintenance, and the maintenance time is selected according to the engineering experience of maintainers. This method lacks theoretical support and field data verification. State based maintenance strategy is widely used in military, aerospace and petrochemical fields, but its application in power system is unusual. Firstly, this paper analyzes and studies the present situation of the maintenance strategy of safety instruments at home and abroad, introduces the safety instrument system and safety standards, and compares the maintenance strategies of three kinds of safety instruments, such as periodic maintenance. Based on the condition maintenance and reliability maintenance, in addition, the whole furnace fire extinguishing protection sub-function in the main fuel tripping of thermal power plant and the over-voltage and over-current tripping subsystem in the instrument and instrument system of the substation are selected as the research objects. In order to study the system mentioned above, firstly, according to the daily operation data of thermal power plant, using the theory of safety and reliability, taking IEC61508 and IEC61511 as the principles, the fault tree model is obtained and the safety evaluation of the system is carried out, and the safety integrity grade is obtained. Secondly, according to the actual characteristics of substation instrumentation system, the paper puts forward the substation regular maintenance strategy, considers availability, reliability, maintenance cost, applies multi-objective optimization strategy, and uses genetic algorithm to obtain the optimal maintenance interval. To provide reference for substation maintenance work. Finally, by studying the safety evaluation and maintenance strategy of substation and thermal power plant, the main factors affecting the safety of thermal power plant and substation are obtained and the direction of improvement is pointed out.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM930.7

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