320 MW汽轮机金斯伯利型推力轴承替代米切尔型推力轴承可行性分析

Feasibility Analysis of Replacing Mitchell-type Thrust Bearings with Kingsbury-Type Thrust Bearings in 320 MW Steam Turbines

在汽轮机的运行中推力轴承起到了平衡轴向推力的作用,保证了动静叶栅之间的间隙,防止了动静叶栅发生碰磨.在实际生产过程中,推力轴承温度高、磨损的情况也时有发生.针对某电厂8号机推力轴承瓦块温度高的问题,通过解体分析,判断主要是由于各推力瓦块载荷相差大、推力轴承自我调节能力差引起的瓦块温度高,采取了将米切尔型推力轴承更换为金斯伯利型推力轴承的方案,在更换推力轴承型式后,推力轴承瓦块温度高的问题得到了有效的改善,保证了机组的安全稳定运行.

In the operation of the turbine,the thrust bearing plays the role of balancing the axial thrust,ensuring the clearance between the dynamic and static blade grids,and preventing the dynamic and static from touching and grinding.In the actual production process,high temperature and wear of thrust bearing occur from time to time.In response to the problem of high temperature of the thrust bearing block of No.8 machine of a power plant,through disassembling and analysis,it was judged that it was mainly due to the high temperature of the block caused by the large load difference of each thrust block and the poor self-adjustment ability of the thrust bearing,and it was adopted that the Mitchell-type thrust bearing was replaced by Kingsbury-type thrust bearing,and after the replacement of the thrust bearing,the problem of the high temperature of the thrust bearing block was effectively improved,which ensured the safe and stable operation of the unit.safe and stable operation.