Remote predictive maintenance of bistable behavior of air compressor rotor

The MS uses remote predictive maintenance and methods to maintain the bistable behavior of the air compressor rotor. The basic situation of the faulty unit is introduced. For the abnormal situation of the bistable behavior of the unit vibration, effective maintenance suggestions are put forward, and good results have been obtained through production verification.

Predictive maintenance, introduction Air compressor is the key equipment of air separation unit. Once a fault occurs, it will cause significant economic losses to the enterprise. Therefore, the vibration fault diagnosis for air compressor is beneficial to ensure the safe and reliable operation of the unit. In this paper, the bistable behavior of the air compressor vibration of a plant's air separation unit is used. Fault diagnosis Chen Changzheng Guo Jiumei Shenyang University of Technology Bi Delong Zhao Hai Shenyang Blower Group Co., Ltd. provides fault diagnosis for stable and safe production.

1 Predictive Maintenance Brief In China, the use of predictive maintenance system is still a new exploration. It is a kind of creative unit diagnosis and maintenance simulation and diagnostic device to predict the equipment failure status to determine the time and content of mechanical equipment maintenance work. Predictive maintenance is no repair without failure. The advantage is to reduce unplanned downtime; purchase and use only the required spare parts when needed; only repair at the appropriate time.

2 Faulty Unit Introduction 2.1 The unit structure and measuring points are arranged in the remote monitoring center. Remote monitoring and diagnosis of a petrochemical company's air compressor unit is carried out by using a remote monitoring system.

The air compressor is a Sino-foreign cooperative production project, in which the rotor is manufactured by a well-known foreign company. The drive machine is a steam turbine, and its unit structure and measuring point arrangement are 1.

2.2 Unit design parameters The air separation unit air compressor unit was built in 2007. The compressor is horizontally split and the unit design parameters are 1.

Parameter value host working speed rAnin medium air host inlet pressure for host outlet pressure 8 host door overflow, host outlet overflow, especially observe the situation of the four vibration channels of the compressor, it is not difficult to find that the amplitude of the four channel vibrations are presented Periodic fluctuations, the fluctuation period is about 1, 2. It must be pointed out that the amplitude of the vibration of the four channels of the steam turbine is very stable, so the situation of the steam turbine is not considered for the time being. However, in terms of the abnormal condition of the vibration frequency value of the compressor, the compressor rotor system is in an unstable operating state at this time, but the amplitude does not reach the shutdown value 3 phase progress to observe the vibration multiplication of the compressor, it is not difficult to find The amplitude variation of the frequency doubling is very similar to the frequency value. It is important to note that both the phase and the amplitude exhibit periodic periodic fluctuations, and the fluctuation period is about 1. 3. Continue to observe the low amplitude. And the waveform spectrum of the vibration at high amplitude is not abnormal in the time domain, while the energy change in the frequency domain is mainly at the power frequency, 4 and 5.

In fact, if the axis trajectory is a closed curve from the rotor dynamics angle 4, the motion along this curve belongs to self-excited vibration, which is called closed-loop motion. When it is subjected to lateral disturbance and called 0, the rotor works above the critical angular frequency. There is, here, the ruler is the amplitude of the unbalanced response, the working speed is 4988, which is greater than the critical speed.

The rotor system is always in and out, and the cycle of change is around. Therefore the rotor is in a bistable state. The bistable behavior of the rotor belongs to the nonlinear behavior of the rotor support system. It is the sudden jump of the rotor from the state of stable operation to another state, which forms the change of the phase 7 and the initial phase.

207 Low-amplitude axis trajectory After the rotor is replaced, the vibration condition returns to normal. 9. The amplitude and phase of the rotor are relatively stable.

The phase 4 conclusion is due to the bistable state of the rotor system, especially the phase fluctuations, so consider the rotor itself. In order to put into production as soon as possible, after the replacement of the spare parts rotor, the stable production of the rotor provides a practical guarantee. Yes, this example is based on predictive maintenance success stories for remote condition monitoring.

Liu Hequn. Analysis and Treatment of Vibration Test of Type Centrifugal Compressor Yue Fengjie, Pang Wenjie. Oil film stability analysis of rotor bearing systems is used in solving rotary machinery failures. Fan Technology, 20051226.

Chen Changzheng, Hu Lixin, Zhou Bo, et al. Equipment Vibration Analysis and Fault Diagnosis Technology Science Press, 2007910.

Liang Qirong, Li Guogui. The rotor dynamics of a single-shaft isothermal centrifugal compressor 叮 Zhong Wei, He Yanzong, Wang Zheng, et al. Rotor Dynamics 1. Tsinghua University published Qu Liangsheng. The principle of holographic diagnosis of mechanical failure. Science Press,

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