Bucket turbine is the main equipment of the coal conveying system, and the operation status of bucket turbine directly affects the load of the unit.Large slewing bearing is an important part of bucket turbine rotary mechanism. After the slewing bearing is damaged, how to replace it safely and with high quality in a short time is the main purpose of this paper. This paper analyses the cause of damage of large slewing bearing and introduces emphatically the technology of "jacking method" to replace large slewing bearing of bucket turbine. This method is used to replace the big bearing of DQL1200/1600-30 type bucket turbine of shentou NO.2 power plant. The practice proves that this method is successful. The construction period is only 6 days and the cost is 100,000 yuan. More than 1 year of operation after replacement, stable rotation, good meshing of big and small gears, normal operation and rated output.
The reasons for turbine large slewing bearing damage are as follows:
(1) Big bearing has been in service for 12 years, with a long cycle. Defects were exposed as early as 2001 when it was overhauled.
