Retrofit of 600MW ash removing air compressor motor drive installation platform
Deng Haibo Datang Xiangtan Power Generation Co., Ltd. DO1:10.3969/j.issn. The 600MW ash air compressor motor drive installation platform transforms the vibration generated by the motor, which shortens the insulation and bearing life, affects the normal lubrication of the bearing, and the vibration force promotes the insulation gap. The expansion causes external dust and moisture to invade, causing a decrease in insulation resistance and an increase in leakage current, and even an accident such as insulation breakdown. At the same time, the vibration of the motor will cause fatigue of all mechanical parts subjected to vibration, which will loosen or break the base and anchor bolts of the motor, and cause motor damage caused by abnormal wear and quenching of the motor bearings. Therefore, reducing and improving the vibration of the motor is a positive measure to improve the running quality and service life of the motor.
This paper introduces the structure and connection method of L250 screw air compressor produced by Shanghai CompAir in 2005, and briefly describes a large analysis and improvement measures of motor vibration.
The 600MW ash air compressor made by Datang Xiangtan Power Generation Co., Ltd. is the L250 screw air pressure* produced by Shanghai Kangpuai Company in 2005. The air compressor connection form is V-belt automatic tensioning device.
The original design of the machine motor is IP23's 380V low-voltage motor. The design motor weight is 2t, which is a welded rectangular structure. However, due to the company's 1* requirements and the %% limitation, the IP54 6KV rolling motor is used for design and design. It is 2.3t, which exceeds the weight of the original design motor by 0.3t. During the operation, the motor has poor bearing lubrication effect, the temperature of the deer leaks, the outer ring of the shaft is misaligned, and the bearing is broken.
4.V type belt set 5. Main motor 6. Type belt - machine side 7. Pillow block 8. Shockproof seat 9. Threaded rod 10. Screw \11. Narrow ring, 2 tight spring 13. Combination fork cause analysis of motor The reasons for the vibration are as follows: 1. Reasons for the motor: I machine rotor f umbrella scale, stator rotor magnetic center asymmetry, stator rotor air gap unevenness, bearing induced vibration.
2. Mechanical reasons: the coupling is not balanced, and the center is not found. If the motor and the air end are not on the same plane, the motor and the air end will be unbalanced. The belt transmission process will produce strong vibration.
3. Basic reasons: Resonance occurs when the excitation frequency w is equal to the natural frequency w0. If the fundamental natural frequency is the same as the excitation frequency, the motor will resonate. The motor drive mounting platform has poor rigidity and poor anti-interference ability, and it is easy to cause motor vibration.
3.1. After the design changes the weight of the motor, the manufacturer only thickens the motor drive installation platform. In fact, the natural frequency of the support shaft of the drive platform is not increased, but decreased, so the vibration is maximum in the vertical direction. It is one of the main reasons for the vibration of this type of air compressor motor.
At the motor belt side junction box, the 1L250 screw air compressor structure diagram motor junction box is heavier and farther away from the drive mounting platform support shaft, so that the belt end motor center of gravity deviates, the weight imbalance causes the motor belt side vertical direction vibration to increase Once the vibration frequency of the motor is equal to the natural frequency of the drive installation platform, it will generate strong resonance. Once the vibration of the junction box is reduced, the vibration will drop greatly after it deviates from the resonance frequency. The vibration at the junction box is the vibration of the motor of this type. Another important reason.
3.3. Some parts of the whole machine housing are suspended, desoldered or loosely connected. The rigidity of the platform is reduced, the natural frequency is reduced, and the motor is large. The solution is improved. The vibration value of the low loyalty machine is improved. Frequency S is modified for this type of motor drive installation platform. 1 Motor drive unit is welded at the front and rear bases with two 1000*320*25mm reinforcements and two 1400*60*25mm ribs. Thick, the diameter from the original 55mm bold to 70mm, and cause the motor vibration value is too large, such as the frame of the uneven pad gasket leveling, reinforcement of the oil separator base and other measures to reduce the motor vibration value.
The analysis and discussion decided to transform the motor drive installation platform of the 60000W31 ash air compressor of Datang Xiangtan Power Generation Co., Ltd. according to the above scheme.
Comprehensive analysis: After 10 months of tracking and measuring the vibration value of the motor of the ash air compressor of Datang Xiangtan Power Generation Co., Ltd., the data is shown in Table 1. The regulations stipulate that the motor vibration value of 1500 rpm is on the measurement date. Motor front-end drive installation platform front-end motor rear-end drive installation platform rear end through the tracking analysis and judgment of the vibration value of the 31 ash air compressor motor and the drive installation platform, the transformation program can greatly reduce the model and the connection mode air compressor The problem that the motor vibration value is too large.
Due to the better effect of the transformation of the 31 ash air compressor motor and the drive installation platform, Datang Xiangtan Power Generation Co., Ltd. decided to renovate the remaining 6 ash air compressor motor drive installation platforms for 600 MW ash removal. The vibration values ​​of the 7 sets of 600MW ash air compressors and the vibration values ​​of the platen are all within the qualified range. The motor failure rate is significantly reduced, the number of non-stops is greatly reduced, and the maintenance cost is up to 100,000 yuan.
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