Research And Treatment Of Turbine Vibration Of Unit 1 In Xinhai Power Plant

At present,there are more than one million units in operation in China.Among them,the market share of Siemens units is high,the unit capacity is large,the efficiency is high,and the economic indicators are good.However,there are some problems,of which bearing vibration is the existence of many power plants common problems,vibration diagnosis is very difficult,and the problem is complex.The most important thing is that once the fault is uncontrolled,it will seriously affect the safe and stable operation of the unit.In this paper,the vibration problem of bearing bush of 1 unit in a power plant is studied,and the main factors causing the vibration of bearing bush are analyzed from the theoretical basis and field practice monitoring.Based on the effect of impact force,friction force and shaft stiffness change,this paper studies the vibration mechanism of dynamic and static rubbing,and analyzes the causes of the dynamic collision,Concluded that dynamic characteristics of activity,and it is concluded that touch the ground vibration signal through practice the main characteristics and Jane break method,based on field measured data and diagnostic equipment many times to data analysis,Combining the vibration characteristics and spectrum characteristics of rubbing,it is one of the important factors that influence the vibration of the bearing.Through data arrangement,this paper summarizes the on-site emergency treatment measures caused by the large vibration caused by the dynamic and static rubbing of the axle bush.In addition,this article also on bearing form,geometric parameters of the bearing position in the journal,and study the effect of oil film instability factors,combined with the instability characteristics and diagnostic methods of bearing,the bearing mechanism of instability of oil film.This paper focuses on the basic characteristics of sliding bearing,including the basic principle,the axial static trajectory,bearing capacity and dynamic characteristics of the sliding bearing.Finally,from the study of the design structure of the bearing and the experience adjusted according to the field practice,obtained the treatment of oil film instability in the bearing.Based on the theoretical research of dynamic and static rubbing and oil film instability,analyzed the two typical cases of high vibration of the shaft of Xinhai Power Plant,summarized the vibration characteristics and vibration causes,and determined the research and resolution of dynamic and static rubbing and oil filminstability,obtained the countermeasures and Suggestions of solving the bearing vibration in operation and maintenance.Finally,put forward the scheme of checking the oil file of the bearing chamber,adjusting the middle and high pressure rotor to the center of the wheel and checking the cylinder center of the high pressure rotor,Solved the problem of dynamic and static rubbing of the unit.Through the inspection of the basic data of the bearing pad and the problems found in the dismantling process,the instability of the oil film is confirmed and the specific solution is provided.,summarized the inspection direction and processing advice for the similar problems of the same type unit.