METHOD FOR DETECTING LEAKAGE OF FULL-CAPACITY LNG STORAGE TANK BY ACOUSTIC EMISSION

METHOD FOR DETECTING LEAKAGE OF FULL-CAPACITY LNG STORAGE TANK BY ACOUSTIC EMISSION

Disclosed is a method for detecting leakage of a full-capacity liquefied natural gas (LNG) storage tank by acoustic emission. The method includes: detecting an amplitude of system noise by an acoustic sensor, and determining a signal acquisition threshold; acquiring an amplitude of ambient noise; ac...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: OUYANG, Yufeng, HU, Bin, ZHANG, Junjiao, SHEN, Yongna, SHEN, Gongtian, LI, Mengjun
Format: Patent
Sprache:eng
Schlagworte:
BLASTING
FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES
FIXED-CAPACITY GAS-HOLDERS
HEATING
LIGHTING
MEASURING
MECHANICAL ENGINEERING
PHYSICS
STORING OF DISTRIBUTING GASES OR LIQUIDS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES
WEAPONS
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Beschreibung
Zusammenfassung:Disclosed is a method for detecting leakage of a full-capacity liquefied natural gas (LNG) storage tank by acoustic emission. The method includes: detecting an amplitude of system noise by an acoustic sensor, and determining a signal acquisition threshold; acquiring an amplitude of ambient noise; acquiring an amplitude of the acoustic signal excited by the analog sound source at the distance of 0.1 m from the acoustic sensor and an amplitude of the acoustic signal excited by the analog sound source at the distance of x m from the acoustic sensor, and calculating, an attenuation coefficient of an acoustic signal passing through the outer wall of the storage tank; determining a maximum detection range of the acoustic sensor; and continuously moving the acoustic sensor on the outer wall of the storage tank in a step smaller than the maximum detection range, to perform an LNG leakage detection.