Carburization Analysis of Ethylene Pyrolysis Furnace Tubes after Service

Lian, Xiaoming; Chen, X.D.; Chen, T.; Ye, Jiamin; Sun, Jia

doi:10.1016/j.proeng.2015.12.298

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…Operating at high temperatures (e.g., 1100 °C) for extended periods, the furnace tube endures complex stresses, including internal pressure, self-weight, fatigue, and thermal shock resulting from start-up and shutdown processes. Consequently, occasional failures occur in cracking furnace tubes, where the medium reacts 1 , 2 . These failures occur for multiple reasons 3 – 5 associated with various factors.…”

Section: Introductionmentioning

confidence: 99%

Combining ultrasonic guided wave and low-frequency electromagnetic technology for defect detection in high-temperature Cr–Ni alloy furnace tubes

Du,

Li,

Liu

et al. 2023

Sci Rep

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Cracking furnaces, operating under high temperatures and in a hydrocarbon medium, subject their tubes to complex stresses such as internal pressure, self-weight, fatigue, and thermal shock during start-up and shutdown. As a result, these furnace tubes frequently experience failures characterized by cracks and corrosion perforation. The high-temperature environment, constantly evolving structure of the tubes, and the close arrangement of the cracks within the tube box hinder detecting the cracks using conventional single-detection methods is challenging. This paper breaks through the limitations of the traditional single detection method and studies the effectiveness of the combination of ultrasonic-guided wave and low-frequency electromagnetic detection methods. The experiment was carried out by deliberately making cracks and thinning defects caused by corrosion on the cracking furnace tube of Cr35Ni45Nb after two years of service. The experimental results show that the ultrasonic guided wave detection technology can quickly detect the defects running through the whole furnace tube and effectively identify the manufacturing defects. On the other hand, low-frequency electromagnetic detection makes it possible to scan suspicious local defects and make qualitative and quantitative analyses of defect signals. The combination of ultrasonic guided wave and low-frequency electromagnetic detection can realize the rapid location and comprehensive qualitative and quantitative analysis of furnace tube defects, thus making up for the defects missed detection caused by the lack of effectiveness of single detection and the resulting safety problems. The research results have great popularization value in practical engineering applications.

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Section: Introductionmentioning

confidence: 99%

Combining ultrasonic guided wave and low-frequency electromagnetic technology for defect detection in high-temperature Cr–Ni alloy furnace tubes

Du,

Li,

Liu

et al. 2023

Sci Rep

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show abstract

“…During the operation of the furnace tube, the outer wall of the tube in service is radiated by high temperature flame and its ambient temperature can reach 1100℃. The raw material inside the tube is a mixture of high carbon potential hydrocarbon gas and water vapor, therefore its inner wall is in the environment of circulating oxidation and carburizing, and its outer wall is in the environment of high-temperature oxidation and decarburization; besides, the ethylene cracking furnace tube is subject to additional stresses caused by internal pressure in the tube, body weight of the tube, temperature difference between the inner and outer walls and on/off process; working in such environment, carburizing, thermal fatigue, creep and other damages are quite easy to occur in the cracking furnace tube and its actual service life is often far lower than the design life [1][2][3][4][5][6][7][8]. Carburizing is the main damage form of ethylene cracking furnace tubes.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Element Redistribution in Carburizing Process of Ethylene Cracking Furnace Tube

Zhang

Ding

et al. 2022

Advances in Transdisciplinary Engineering

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Carburizing is the main damage form of ethylene cracking furnace tubes. In this process, the microstructure of the furnace tube would change and the element diffuses and redistributes. After serving for about 41000h, the radiation section of a plum blossom tube of SC-1 tubular cracking furnace from a petrochemical company was tested and analyzed in this article. Results show that the higher the service temperature, the more serious the carburizing of the furnace tube. In the inner-wall carburized zone of the middle temperature section of the furnace tube with an initial C content of 0.1wt%, the maximum C content reaches 1.83wt% and the number of carbides increases obviously as well as its organizational morphology changes from fine granular to coarse block or chain like and its organizational type changes from single M23C6 to the coexistence of M23C6, M7C3 and MC type carbides. The Cr and C elements in the carburized zone are mainly concentrated in the grain boundary area in the form of carbides. At the same time, the diffusion of alloy elements causes Cr deficiency in the matrix, and the carbide deficiency zone appears in the subsurface of the inner wall.

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Method to Determine the Thickness of the Carburized Layer of Pyrolysis Furnace Tubes Using Ultrasound Technique

et al. 2019

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Carburization Analysis of Ethylene Pyrolysis Furnace Tubes after Service

Cited by 9 publications

References 7 publications

Combining ultrasonic guided wave and low-frequency electromagnetic technology for defect detection in high-temperature Cr–Ni alloy furnace tubes

Combining ultrasonic guided wave and low-frequency electromagnetic technology for defect detection in high-temperature Cr–Ni alloy furnace tubes

Microstructure Evolution and Element Redistribution in Carburizing Process of Ethylene Cracking Furnace Tube

Method to Determine the Thickness of the Carburized Layer of Pyrolysis Furnace Tubes Using Ultrasound Technique

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