Analysis Of Noise Elimination And Vibration Damping In High Temperature And Pressure Pilot Superheat Steam Traps

This thesis is supported by the Ministry of Science and Technology Project per-sonnel service Corporate Actions (NO: 2009GJG10005). Steam traps are a self-control valves to protect the steam system(steam heating pipe network)work, condensing water recycling, energy conservation. As energy issues and the expansion of industrial scale, industrial production showed a large capacity, high efficiency and low energy con-sumption trends. Steam traps have been applied to supercritical , ultra supercritical nuclear power plants, the main role in high temperature and high pressure is exclusion of superheat or saturated steam that fail requirements. The fluid of superheated steam traps is a typical high-speed turbulent flow, fluid induced vibration and produced strong noise, leading to wear of valve components. In response to this situation, su-perheat steam traps of Gansu Hongfeng Machinery Co,.Ltd have been conducted the following series of studies, which provide the reliable basis for the noise elimination vibration damping and capability choiceness.According to the feature of the geometry and character of the fluid field, 2D meshing model was established in FLUENT software of CFD. In order to find the reason of vibration and noise, the turbulent flow field problem was solved by using the numerical calculation with two methods of Time-Average flow analysis and Large Eddy Simulation(LES), analysis of pressure distribution, velocity distribution , vortex distribution and characteristics in turbulent flow field, it was found the main factors of vibration and noise in steam traps.In the flow field through FLUENT aero-acoustics based on FW-H approach carry out its sound field spectrum analysis, the turbulent flow graph of pressure fluctuation and the noise spectrum were gained.Based on flow field analysis of the steam traps, the frequency of the noise signal mechanism of the high acoustic level and principle of throttle step-down, throttle in-jection muffler of low vibration and noise steam traps were designed. In this paper, the structure optimization design method was taken to select the appropriate structure and worked out reasonable size, make it not only meets the requirement of reducing noise, but also saves the material and reduces the volume. The spectrum analysis was carried for the throttle injection muffler, contrast to noise spectrum analysis chart of the su-perheated steam traps, the results of numerical analysis match with the theoretical analysis. Through software ANSYS of the finite element method, structural shell 93 ele-ment type and the smart grid model were used for the throttle injection muffler. The former N step inherent frequency and model vibrating shape were calculated, and the muffler was judged to meet the requirements.