高炉减压阀组后煤气管道振动原因分析及对策

发布时间：2018-02-08 12:05

本文关键词： 管道波纹管随机振动功率谱密度 ANSYS　出处：《内蒙古科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：管道是工业生产中的介质输送的重要组成部分,一般输送具有有高压、易燃、易爆、有毒的的介质。在压力管道系统中,管道振动是一种较常见的现象,振动会造成管道或附属设施的疲劳损坏。一旦发生破坏,将造成巨大的财产损失,并严重威胁工作人员的生命安全。因此,对管道振动破坏分析有极高的理论和实际生产意义。本文针对某钢铁企业1号高炉减压阀组后煤气管道振动破坏的问题,根据现场管道及设备的运行工况,选取8个点作为管系振动检测部位,测试管系各点在不同工况下的振动频谱图。利用有限元软件对波纹管补偿器及管道系统进行建模和动力学分析,获得波纹补偿器及管系的前40阶固有频率,以及管系的前8阶振型图。依据实际检测管道系统的振动数据,减压阀组本体振动分析,波纹管补偿器的受力和有限元分析,以及管道系统的有限元分析,发现减压阀组调节高炉顶压大幅开关过程中,输送的煤气流动是复杂的湍流流动,气流激励加剧了管道系统的振动。根据计算分析管系振动原因,提出故障管道减振改造方案,并对改造前后的管道振动情况进行测试对比,验证了减振改造后管道的运行效果。最后,尝试采用随机振动分析的方法,计算管道在冲击荷载的作用下,减压阀组后管道的响应位移、速度、加速度功率谱密度。结果表明,该管道在气体冲击荷载的作用下,计算得到的响应位移、速度、加速度功率谱数值很小,可能因功率谱密度计算公式并未考虑尺寸效应致使结果与实际情况不同。
[Abstract]:Pipeline is an important part of medium transportation in industrial production. It has high pressure, flammable, explosive and toxic medium. In pressure pipeline system, pipeline vibration is a common phenomenon. Vibration can cause fatigue damage to pipelines or ancillary facilities. Once damaged, it will cause huge property losses and seriously threaten the safety of staff members. It is of great theoretical and practical significance to analyze the vibration failure of pipeline. Aiming at the problem of vibration failure of gas pipeline after the pressure reducing valve of No. 1 blast furnace in a certain iron and steel enterprise, according to the operation condition of pipeline and equipment on the spot, In this paper, 8 points are selected as the position of vibration detection of pipe system, and the vibration spectrum of each point of pipe system under different working conditions is tested. The corrugated tube compensator and pipeline system are modeled and analyzed by finite element software. The first 40 natural frequencies of corrugated compensator and pipe system and the first 8 order vibration pattern of pipe system are obtained. According to the vibration data of the actual inspection pipeline system, the vibration analysis of the pressure relief valve group, the force acting on the bellows compensator and the finite element analysis of the corrugated tube compensator are obtained. The finite element analysis of the pipeline system shows that the gas flow is a complicated turbulent flow in the process of adjusting the blast furnace top pressure large switch by the pressure reducing valve group, and the gas flow excitation intensifies the vibration of the pipeline system. According to the calculation, the causes of the pipe system vibration are analyzed. This paper puts forward the retrofitting scheme of the faulty pipeline vibration, and tests and compares the vibration of the pipeline before and after the retrofit, which verifies the operation effect of the pipeline after the vibration reduction and transformation. Finally, the method of random vibration analysis is tried. The response displacement, velocity and acceleration power spectrum density of the pipeline after the pressure relief valve group are calculated under the impact load. The results show that the response displacement and velocity of the pipeline are calculated under the action of the gas shock load. The value of acceleration power spectrum is very small, which may be different from the actual situation because the size effect is not taken into account in the formula of power spectrum density.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TF57

【参考文献】