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%.
Highlights
Storage vessels and containers are widely used in a range of industries
The current research of CO2 leak detection in the transportation process has mainly focused on pipelines [4,5]
This paper proposes a novel circular acoustic emission (AE)
Summary
In the carbon capture and storage (CCS) process, storage vessels are used to store and transport the captured CO2 [1]. Accidental leaks from CO2 storage vessels may compromise the stability and safety of the CCS system and cause serious environmental pollution and financial damage [2]. The current research of CO2 leak detection in the transportation process has mainly focused on pipelines [4,5]. There has been very little reported research on the leak detection for CO2 storage vessels. 0.6% support on a 100 100 cm plate. The authors to acknowledge the Chinese of and Education for providing financial the principal investigator of thewish research and offered suggestions in Ministry the analysis presentation of the results; support for this research part of the Projects (B13009) North China Electric
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