白山300MW水轮发电机组的推力轴瓦多次烧毁,迫使机组停机,本文根据液压推力轴承的结构特点,及烧瓦部位和深度,分析烧瓦原因认为:轴瓦设计单位压强过高,轴瓦变形大,逆止阀泄压,瓦面油室位置不合理;运行中油含杂质,冷态升负荷速度快,未经盘车刮瓦,修复瓦面时中部凹陷值过大.为此,电站采取相应改造措施,用圆环式支撑代替单支柱式支撑,增加推力瓦切向偏心率,在逆止阀前增加一个逆止阀,改变轴瓦上小油室的位置和深度.改进后的对比试验和运行实践证明,各项技术指标达到设计要求,确保机组安全可靠运行. According to the structural features of the hydraulic thrust bearing and the location and depth of the bush, the reason of the bush is analyzed: the pressure of the bush design unit is too high, the deformation of the bearing bush is large, Check valve pressure relief, tile surface oil chamber position is not reasonable; oil impurities in operation, the speed of cold loading speed, without the car scraping tile, repaired tile surface central depression value is too large .To this end, the power station to take the appropriate transformation Measures to replace the single-column support with a ring-shaped support to increase the tangential eccentricity of the thrust bearing, and to add a check valve in front of the check valve to change the position and depth of the small oil chamber on the bearing bush. Improved comparative test and operation Practice has proved that the technical indicators meet the design requirements to ensure safe and reliable operation of the unit.