Cause Analysis And Countermeasures Of Vibration Of Gas Pipeline After Blast Valve Group Of Blast Furnace

Pipeline transporting medium is an important part of industrial production,generally having a high-pressure conveying,flammable,explosive,toxic media.In the pressure pipeline system,the pipeline vibration is a more common phenomenon,vibration will cause damage to the pipeline or ancillary facilities fatigue.In the event of damage,will result in huge property damage and a serious threat to the safety of the staff.Therefore,the analysis of pipeline vibration damage has a very high theoretical and practical significance.In this paper,a steel enterprises on the 1st blast furnace valve group after the gas pipeline vibration damage problem,According to the operating conditions of the site pipeline and equipment,8 points were selected as the vibration detection part of the pipeline system,and the vibration spectrum of each point under different working conditions was tested.The finite element software is used to model and analyze the bellows compensator and pipeline system,and the natural frequency of the first 40 steps of the corrugated compensator and the pipe system are obtained,and the first 8 order modes of the pipeline system are obtained.According to the actual vibration data of the pipeline system,the vibration analysis of the body of the valve body,the force and finite element analysis of the bellows compensator,and the finite element analysis of the pipeline system,It is found that the gas flow is a complex turbulent flow during the large-scale switching of the blast furnace,and the airflow excitation exacerbates the vibration of the piping system.According to the calculation and analysis of the vibration of the pipeline system,the scheme of the vibration reduction of the faulty pipeline is put forward,and the vibration of the pipeline before and after the transformation is tested and verified,and the operation effect of the pipeline after the vibration reduction is verified.Finally,the method of random vibration analysis is used to calculate the response displacement,velocity and acceleration power spectral density of the pipeline after the action of the impact load.The results show that the calculated value of the response displacement,velocity and acceleration power spectrum is small under the action of the gas impact load,which may be different from the actual situation because the power spectral density formula does not consider the size effect.