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Resistance Vibration Analysis of Supercritical Power Unit Water Service Pipe

Author: PengJie
Tutor: HuangShuHong
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Water supply pipeline Finite Element Vibration mode Dynamic Response Three-dimensional analysis
CLC: TM621
Type: Master's thesis
Year: 2007
Downloads: 122
Quote: 2
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Abstract

With the rapid development of China's power industry, large-capacity high-temperature and high-pressure unit has become the main unit of the power plant in China. Due to the improvement of the parameters, the transmission of mechanical vibration of the main and auxiliary equipment, major pipeline operating conditions of the working fluid is a significant change and the change of the arrangement, so that part of the pipeline more serious vibration phenomenon directly affect the normal start and stop of the unit and run . The thermal power plant high-pressure water supply pipeline undertaking the task of providing water supply to the boiler, pipe vibration to the pump start and stop, and changes in plant conditions, pipelines and their link equipment safety will have hazards. In order to ensure the safe operation of the unit. Eliminate the risks, there is a need to conduct in-depth research and analysis of the formation mechanism of the pipe vibration. Information access and synthesis of a large number of domestic and international pipeline vibration, the the pipe vibration causes harm and damping measures. Starting from the finite element and vibration theory, finite element analysis software for three-dimensional modeling of the power plant water supply pipeline, of pipeline natural frequency, mode shapes, as well as steady-state and transient impact dynamic response analysis. Water supply pipeline in the operation of the dangerous condition of the CFD calculations, as a the pipes three-dimensional finite element model of the the nonlinear pressure boundary conditions, detailed dynamic response analysis of the pipeline, to provide a basis for optimization of pipeline design and layout, as well as to optimize the operation mode . Modal comparative analysis of the finite element model using the three different cell types of beams, shells, three-dimensional solid pipeline, and analysis of the inherent characteristics of the different unit pipeline for pipeline modeling to provide a more rational basis for, and the actual power plant water supply pipeline modal analysis to calculate the first ten natural frequency and its analysis of the top 5 order modes, as the basis for the design of power plant water supply pipeline. Three-dimensional modeling of the power plant water supply pipeline and the pipeline dynamic response analysis of simulated operating conditions, including uniform changes in the condition of the fluid pressure in the pipeline, rated steady state conditions, the pressure transient caused by quick closing of the valve impact conditions. Detailed calculation of these conditions the displacement of the piping system response and wall stress distribution, combined with the stress of Security Checking and comprehensive analysis of the impact of the pipeline system vibration reasons, comparison. The calculations show that the flow-induced pipe vibration of the main reasons not because of the pressure in the pipeline purely elevated, but the distribution of fluid pressure within the pipeline uneven fluid disturbance caused by the pipeline's impact. Pipe stress strength checking shows that even in the tube transient impact pressure suddenly increased significantly over the rated pressure of the fluid inside the pipe stress remains from the current thickness pipeline relatively large gap between the allowable stress calculations show the cause of pipeline accidents in general not due to the problems of the wall thickness. This also provides the basis for the design, the wall thickness to reduce unnecessary saving material.

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