Research on high-frequency vibration of large pipeline of a propane dehydrogenation unit

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (4) : 144-150.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Research on high-frequency vibration of large pipeline of a propane dehydrogenation unit

HE Jia*1,2,LIANG Haohua1,2,ZHANG Guohua3,YANG Yuqiang3,HU Meifei1,2,CHEN Zhengqing1,2

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Abstract

During dehydrogenation operations, large-scale petrochemical pipelines are prone to high-frequency severe vibrations and significant noise pollution due to complex working environments, affecting structural integrity and posing safety hazards. Therefore, it is essential to study the vibration phenomena and mechanisms. This paper focuses on a large pipeline of a propane dehydrogenation unit, analyzes the vibration characteristics based on field measurement data, and uses the transfer matrix method to obtain the natural frequencies of the gas column under different working conditions. Findings indicate that the pipeline has high vibration acceleration but low displacement, with a high frequency and a clear multiple relationship between the dominant frequencies, such as 26Hz and 52Hz. The natural frequency of the gas column is close to that of the pipeline, and the excitation frequency from the compressor leads to resonance. The methods used in this study are simple and efficient, suitable for analyzing the vibration characteristics and causes of large-scale propane dehydrogenation pipelines in practical engineering, and provide a reference for the performance evaluation and vibration reduction design of similar pipelines.

Key words

pipeline vibration / frequency multiples phenomena / natural frequencies of internal gas column / transfer matrix method

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HE Jia1, 2, LIANG Haohua1, 2, ZHANG Guohua3, YANG Yuqiang3, HU Meifei1, 2, CHEN Zhengqing1, 2. Research on high-frequency vibration of large pipeline of a propane dehydrogenation unit[J]. Journal of Vibration and Shock, 2025, 44(4): 144-150

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