Power station boiler pressure pipeline weak leakage signal detecting method

Abstract

The invention discloses a fire power station boiler four-pipe preliminary leakage weak signal online detecting method, and belongs to the field of power station boiler pressure pipeline preliminary leakage weak signal detection. The weak signal detection theory is introduced to furnace pressure pipeline weak leakage signal detection, EMD is combined with a self-correlation differential duffing vibrator method for detection, EMD is carried out on collected signals, a background noise and leakage signal database is built for primary screening, an IMF corresponding to a characteristic frequency band is selected for reconstitution, self-correlation processing is carried out on reconstitution signals, the signals obtained through processing are input into a differential duffing vibrator based an adjustable time domain, differential signals are output for judgment, the detecting signal to noise ratio is low, and the real-time performance is good.

Description

technical field [0001] The present invention relates to the field of initial stage weak signal detection of boiler pressure pipeline leakage in thermal power plant, in particular to a method for detecting weak leak signal in the initial stage of leakage of “four tubes” (water wall, superheater, reheater and economizer) of thermal power plant boiler . technical background [0002] Leakage of boiler pressure pipes in thermal power plants directly affects the safe and economical operation of thermal power plants. If the initial leakage of pressure pipes can be detected in time, it can be reported in time, allowing enough time for power grid regulation, reasonable arrangements for shutdown, and operational accidents can be reduced , and bring a certain degree of economy. [0003] At present, there is no research at home and abroad on the initial weak signal detection method of boiler pressure pipe leakage in thermal power plants. There are two types of detection methods for bo...

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Problems solved by technology

Acoustic signal inspection is limited to the situation that the leakage signal energy is strong enough relative to the background noise (CN101487567B acoustic leakage detection and positioning device); the real-time performance of boiler operating condition detection is poor, and is seriously affected by experience (CN101839795B Leakage diagnosis of boiler pressure tube systems and methods)

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