核电汽轮机组降速过程振动特性测试分析

发布时间：2018-07-15 19:27

【摘要】：发展清洁能源,降低煤炭消耗,是推动生态文明建设,践行可持续发展的必然选择,也是实现美丽中国梦的重要前提。核电作为清洁能源的一种,在能源供应、发电成本、特别是环境保护产生的减排效应方面,蕴含着巨大的发展优势。核电的发展,凝聚着清洁能源的希望,也牵动着人们“恐核”的不安。汽轮机作为核电站最重要的组成部分之一,保障其安全稳定运行意义重大。本文对核电汽轮机组的结构和常用的控制与保护系统进行了简要介绍,并且以一台1430MW的核电半转速汽轮机组为研究对象,详细分析了其时域特征和频域特征。同时,又截取了两段具有代表性的振动信号,一段是机组正常转速下即1500转/分时的短信号；一段是降速过程中转速为1223转/分时的振动信号,此时对应的频率恰好是2号轴承振动出现峰值时的频率。文中对这两段信号的轴心轨迹和频谱进行了分析,说明了降速过程对轴心轨迹和频谱的影响。另外,本文以仿真信号为例,对比了不同时频分析方法的特点和优劣。同时以实际测量的机组降转速运行状态下的振动信号为例,结合时频分析方法对机组相对轴振信号和绝对瓦振信号进行分析,并且从不同的角度进行比较,分析机组的稳定性。
[Abstract]:To develop clean energy and reduce coal consumption is an inevitable choice to promote the construction of ecological civilization and practice sustainable development. It is also an important prerequisite to realize beautiful Chinese Dream. As a kind of clean energy, nuclear power has great advantages in energy supply, power generation cost, especially the emission reduction effect of environmental protection. The development of nuclear power, condensed the hope of clean energy, also affect people's "nuclear fear" uneasiness. As one of the most important components of nuclear power plant, it is of great significance to ensure the safe and stable operation of steam turbine. In this paper, the structure and control and protection system of nuclear turbine unit are briefly introduced, and the time domain and frequency domain characteristics of a 1430MW nuclear semi-rotating turbine unit are analyzed in detail. At the same time, two representative vibration signals are intercepted, one is the short signal of the unit at normal speed, that is, 1500 revolutions per minute, and the other is the vibration signal with the speed of 1223 revolutions / minutes during the deceleration process. The corresponding frequency is exactly the frequency of the peak vibration of bearing No. 2. In this paper, the axis locus and the spectrum of the two signals are analyzed, and the influence of the deceleration process on the axis trajectory and the frequency spectrum is explained. In addition, this paper takes the simulation signal as an example, and compares the characteristics and advantages of different time frequency analysis methods. At the same time, taking the vibration signal of the unit under the condition of decreasing speed operation as an example, the relative shaft vibration signal and the absolute tile vibration signal of the unit are analyzed in combination with the time-frequency analysis method, and the stability of the unit is analyzed by comparing them from different angles.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM623

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