东风水电站首台机推力瓦温偏高的原因分析及处理措施

Analysis of Thrust Bearing Shoe Temperature Increase of the First Generating Unit in Dongfeng HydroPOwer Station and Its Treatment

东风水电站首台机组试运行中推力瓦温偏高，空载平均瓦温６９．５℃，带负荷过程曾两次发生瓦温突增２～３℃，由于及时减负荷才避免了烧瓦。经两次瓦温突增瓦面磨损后，只能带９６ＭＷ负荷，平均瓦温７３．２℃。在现场可能的条件下，用提高轴瓦切向偏心率、刮低瓦面热变形高温区和改善油路循环等措施，使机组能带最大负荷１４５ＭＷ，通过７２ｈ试运行，取得较好效果。

During test operation of the first unit in Dongfens Hydropower Station, the temperature of thrust bearing shoe was slightly higher. The average bearing shoe temperature was 69. 3℃ under zero-load. However,the temperature suddenly increased 2-3℃ twice when loading. Owing to reducing the load in time, the bearing shoe damage was avoided, but the work load dropped to 96 MW, and the average bearing shoe temperature rose to 73. 2℃ because of the abrasion caused by the temperature increase. Under the possible insitu conditions, the high temperature zone caused by thermal deformation was reduced by increasing radial eccentricity of the bearing, and by improvement of oil circulation. This enables the unit to produce a maximum load of 145MW. The 72 hours test operation proved that the treatment is successful.