Vibration Diagnosis and Vibration Damping Optimization of Large-Caliber Wedge Gate Valve

doi:10.12141/j.issn.1000-565X.240044

Abstract

Abstract:

Large diameter wedge gate valves are commonly used in petroleum and chemical pipeline systems, where they endure a coupled load of dynamic pressure from the medium and thermal loads. This coupled load not only exacerbates the structural deformation of the valve but also increases the friction wear between the valve stem and the valve cover. Additionally, it may affect the fluid flow pattern, and, in severe cases, may induce flow-induced vibration, leading to valve stem fracture issues. Aiming at the problem of valve stem fracture in the practical engineering application of DN1 200 mm large-caliber gate valve, this paper uses the process discrete analysis method to divide the position of multi-valve plate, adopts ANSYS numerical simulation technology to visualize the flow characteristics of flow field in the gate valve, and employs Fourier signal analysis method to reveal the pressure pulsation response in fluid domain. Then, the modal analysis and harmonic response analysis of the valve pipeline flow system are carried out, and the resonance characteristics of valve stem and gate plate with multi-physical field coupling under specific stroke are studied. The results show that, when the gate valve opens/closes and the stroke is small, the large Karman vortex street and backflow phenomenon are generated due to the disturbance of the gate plate after the valve, the fluid pressure pulsation increases and the flow condition is disordered, which induces the valve pipeline flow system to produce a large common amplitude value, resulting in the fracture of the valve stem. Therefore, this paper proposes and verifies that the addition of expansion pipe can alleviate the vortex and backflow behind the valve, reduce the pressure pulsation and avoid the flow-induced resonance. Qualitative and quantitative analyses are finally performed to determine the expansion pipe size to weaken the fluid pressure pulsation and the common amplitude value. The comparative study shows that the vibration reduction effect is the best when the diameter of the expansion pipe is 1.3 times that of the pipe (1 560 mm) and when the length of the expansion pipe equals the diameter of the pipe (1 200 mm). The obtained results have certain guiding significance for the vibration reduction optimization research of large-caliber gate valves.

Key words: large-caliber gate valve, time-frequency domain analysis, multiple-physical field coupling, pressure pulsation, flow-induced resonance, vibration diagnosis

CLC Number:

TH134

ZHANG Weizheng, HUANG Wenbin, ZHANG Juntao, LIU Jingwei, LIN Hua, HAN Dongmin. Vibration Diagnosis and Vibration Damping Optimization of Large-Caliber Wedge Gate Valve[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(12): 127-138.

Figures/Tables 24

Fig.1

Table 1

Setting of simulation calculation conditions"

条件设置	项目	名称	数值或类型
边界条件	入口边界	压力入口/MPa	3.0
	出口边界	压力出口/MPa	2.7
	壁面边界	标准壁面函数	无滑移
求解设置	求解方法	SIMPLEC	—
求解设置	离散格式	二阶迎风	—
计算方法	数值模型	湍流模型	标准 $k - ε$

Table 1

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Table 2

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Table 3

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Table 4

Table 5

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零部件名称	弹性模量/GPa	泊松比	屈服强度/MPa	许用应力/MPa	热膨胀系数/10^-6K^-1	热导率/（W·m^-1·K^-1）
阀杆（A182F6a）	183	0.27	317	158	12.00	29.2
阀盖与阀体（A216WCB）	190	0.23	187	110	13.56	43.0
闸板（A216WCB）	190	0.23	187	110	13.56	43.0

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