Monitoring method and device for rotating stall of compressor

Abstract

The invention discloses a monitoring method and device for rotating stall of a compressor and relates to the technical field of equipment fault diagnosis. The main purpose is to accurately and effectively monitor the rotating stall of the compressor based on a pressure pulsation signal during the actual operation of the compressor. The method comprises the following steps: collecting pressure pulsation signals of an impeller inlet and outlet of the compressor in real time during the actual operation of the compressor; performing Fourier transform analysis, band-pass filtering and envelope demodulation analysis on the collected pressure pulsation signals, and detecting whether a modulation phenomenon appears on both sides of the leaf band frequency; if yes, extracting a specific characteristic frequency in a low frequency range of the frequency spectrum after envelope demodulation, and comparing the specific characteristic frequency with the rotating speed frequency at which the impeller works in the pressure pulsation signal spectrum; if the magnitude of the specific characteristic frequency is greater than the magnitude of the rotating speed frequency of a predetermined multiple,determining that the rotating stall happens to the compressor. The monitoring method and device for rotating stall of the compressor in the invention are suitable for monitoring the rotating stall ofthe compressor.

Description

technical field [0001] The invention relates to the technical field of equipment fault diagnosis, in particular to a monitoring method and device for compressor rotation stall. Background technique [0002] With the high development of modern industrial production, compressors have been widely used and developed, and occupy a very important position in the national economy, especially in the entire heavy industry system. Sometimes the operating point of the compressor is far away from its design condition, and the airflow compression produces unstable flow, which causes the airflow pressure pulsation in the machine flow channel and pipeline, which leads to strong vibration of the machine and pipeline, and at the same time causes fatigue of machine parts and pipelines Destruction has produced a series of serious consequences. This airflow instability is mainly caused by three reasons, namely rotating stall, unstable inlet vortex and surge, among which the fault caused by rot...

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Problems solved by technology

[0003] Rotating stall is an unstable flow induced by local disturbance. It will not only reduce the flow area of ​​the compressor, limit the stable working range of the machine, affect the reliability of operation, and greatly deteriorate the performance of the compressor. It will cause the compressor blades to vibrate violently so that the blades break and cause huge economic losses

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