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Sensors 2016, 16(11), 1951; doi:10.3390/s16111951

Localization of CO2 Leakage from a Circular Hole on a Flat-Surface Structure Using a Circular Acoustic Emission Sensor Array

1
School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, China
2
School of Engineering and Digital Arts, University of Kent, Canterbury, Kent CT2 7NT, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 17 September 2016 / Revised: 13 November 2016 / Accepted: 15 November 2016 / Published: 19 November 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3457 KB, uploaded 19 November 2016]   |  

Abstract

Leak localization is essential for the safety and maintenance of storage vessels. This study proposes a novel circular acoustic emission sensor array to realize the continuous CO2 leak localization from a circular hole on the surface of a large storage vessel in a carbon capture and storage system. Advantages of the proposed array are analyzed and compared with the common sparse arrays. Experiments were carried out on a laboratory-scale stainless steel plate and leak signals were obtained from a circular hole in the center of this flat-surface structure. In order to reduce the influence of the ambient noise and dispersion of the acoustic wave on the localization accuracy, ensemble empirical mode decomposition is deployed to extract the useful leak signal. The time differences between the signals from the adjacent sensors in the array are calculated through correlation signal processing before estimating the corresponding distance differences between the sensors. A hyperbolic positioning algorithm is used to identify the location of the circular leak hole. Results show that the circular sensor array has very good directivity toward the circular leak hole. Furthermore, an optimized method is proposed by changing the position of the circular sensor array on the flat-surface structure or adding another circular sensor array to identify the direction of the circular leak hole. Experiential results obtained on a 100 cm × 100 cm stainless steel plate demonstrate that the full-scale error in the leak localization is within 0.6%. View Full-Text
Keywords: CO2 leakage; leak localization; acoustic emission; circular sensor array CO2 leakage; leak localization; acoustic emission; circular sensor array
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Cui, X.; Yan, Y.; Guo, M.; Han, X.; Hu, Y. Localization of CO2 Leakage from a Circular Hole on a Flat-Surface Structure Using a Circular Acoustic Emission Sensor Array. Sensors 2016, 16, 1951.

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