Abstract
In order to study the flow-induced vibration characteristics of the natural gas vent pipeline under the internal flow field, taking the gas transmission station pipeline as an example, the ANSYS Workbench software was used to establish models under two working conditions, uncoupling and fluid-solid coupling, for modal analysis, and analyze and compare the calculation results and propose a structural improvement plan. The results show that the maximum amplitude of the first three modes under the two working conditions is concentrated on the riser mouth, and the amplitude under the fluid-solid coupling condition is slightly larger than that of no coupling; the inner diameter of the pipe elbow is large and the pressure is small, and the outside diameter is small and the pressure is small. Large, this instability will increase the air pulsation of the flow field. In the improved scheme, adding a restriction on the top to increase the rigidity of the pipeline can significantly reduce the maximum amplitude of the gas pipeline; adding an orifice to eliminate air flow pulsation has a certain effect on reducing the maximum amplitude and natural frequency, and the combination of the two can make the pipeline more stable. The research results of this paper can provide improved ideas for vibration reduction at the natural gas venting operation site.
Highlights
The venting system is an important facility for long-distance gas pipelines, which plays an important role in ensuring the safety of pipeline maintenance and emergency repairs and reducing the hazards of pipeline accidents [1]
The maximum amplitude of natural gas pipeline under fluid-solid coupling and uncoupling conditions is mainly concentrated at the nozzle in the low-order mode, and the maximum amplitude of the former is slightly higher than that of the latter
Through the transient analysis of the pipeline, it is found that the inner diameter flow rate is large and the pressure is small at the pipe bends, and the outer diameter flow rate is small and the pressure is high; the pulsation force will be generated at the cross section change, which is the exciting force that causes the pipeline to vibrate
Summary
The venting system is an important facility for long-distance gas pipelines, which plays an important role in ensuring the safety of pipeline maintenance and emergency repairs and reducing the hazards of pipeline accidents [1]. Zhang Ke [4] used critical flow numerical calculation and transient simulation calculation of TGNET Pipeline Studio software to study the venting operation process control and venting time measurement method, and compared with the actual venting operation process, it was concluded that the construction pipeline venting operation It is related to the inherent physical parameters such as pipe length, diameter and pressure. VIBRATION CHARACTERISTICS ANALYSIS AND STRUCTURAL IMPROVEMENT OF NATURAL GAS VENTING IGNITION PIPELINE. Zhang Yong [6] and others analyzed the China-Myanmar natural gas pipeline to determine the initial pressure of its venting, select a feasible venting method, calculate the venting time, and evaluate its impact on the environment. This paper uses finite element software to establish a pipe model, analyzes the vibration characteristics of the model under fluid-solid coupling conditions, and conducts the structure Structural improvements
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