455 / 2018-12-29 11:38:34

垃圾发电汽轮机高速转子稳定性研究

高速转子 可倾瓦轴承 稳定性 临界转速

全体主题 > 涡轮机

摘要：作为公用事业和环保产业的垃圾发电是近年来发展的热点，它是世界上最清洁的垃圾处理方法之一。为提高效率垃圾发电汽轮机轴系在增加通流级数的同时提高了工作转速，引起轴承跨距和转子质量的增加使二阶临界转速靠近工作转速，同时高转速下座缸式轴承座支承刚度显著降低，多种因素耦合作用使高速重载轴承瓦温和轴系的稳定性成为难点，前则可通过全尺寸轴承试验台进行测试，后者建立轴承座-轴承-转子动力学模型并优化轴承动特性获得安全的临界转速避开率是本文研究的重点。以25MW垃圾发电汽轮机为研究对象，汽轮机转子工作转速为5500rpm，对四瓦可倾瓦轴承和五瓦可倾瓦轴承支承的汽轮机转子稳定性进行了研究，研究结果表明四瓦轴承支承的转子水平和垂直方向的稳定性更加均衡，同时油膜的有效阻尼作用更显著使不平衡响应优于五瓦轴承支承的转子。现场实测表明四瓦轴承支承的汽轮机转子运行稳定，各项指标优异，轴系稳定性得到验证。

Abstract：The ultimate pursuit Waste-to-energy generation, Which is a utility and environmental industry, has been a hot spot in recent years and is one of the cleanest waste disposal methods in the world. In order to improve the efficiency of the garbage turbine, the working speed is increased while increasing the number of flow passages, causing the bearing span and the increase of the rotor mass to make the second-order critical speed close to the working speed, and the bearing rigidity of the seat-type bearing seat at high speed Significantly reduced, the coupling of multiple factors makes the high-speed heavy-load bearing pad temperature and the stability of the shafting system difficult. The former can be tested by a full-size bearing test bench, while the later which should establishes the bearing seat-bearing-rotor dynamics model and optimizes the bearing dynamic characteristics to obtain a safe critical speed avoidance rate is the focus of this paper. Taking the 25MW garbage turbine as the research object, the turbine rotor working speed is 5500rpm, and the stability of the turbine rotor supported by the 4-tilting pad bearing and the 5-tilting pad bearing is studied. The research results show that the rotor stability in the vertical and horizontal direction is more balanced with 4-tilting pad bearing, and the effective damping effect of the oil film makes the imbalance response better than the same rotor supported by the 5-tilting pad bearing. Field measurements show that the turbine rotor supported by 4-tilting pad bearing is stable in operation, excellent in various indexes, and the shafting stability is verified.