A combined numerical-experiment investigation on the failure of a pressure relief valve in coal liquefaction

Zheng, Zhijian; Ou, Guofu; Yi, Yuwei; Shu, Geping; Jin, Haozhe; Wang, Chao; Ye, Haojie

doi:10.1016/j.engfailanal.2015.11.055

Cited by 23 publications

(12 citation statements)

References 22 publications

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“…With this adverse pressure gradient, backflow zones can be found around the top of the head of the valve spool as a result of fluid viscosity. As affected by the high-speed backflow, the area of the upper bubbles is larger than that on the lower side (Zheng, Ou, Yi, et al, 2016).…”

Section: Cavitation Development Process In Radial Directionmentioning

confidence: 96%

“…The commercial software Ansys Fluent 15.0 is employed for numerical calculation of the cavitation flow in the regulating valve. The fluid inside the regulating valve is a complex multiphase flow Zheng, Ou, Yi, et al, 2016), and a transformation from liquid to vapor exists when bubbles occur. Based on the Navier-Stokes equation, the gas-liquid phase is considered continuous, and the mixture model is often selected to describe multiphase flow (Qiu et al, 2018b;Yin, Yu, Jia, & Yu, 2016).…”

Section: Numerical Simulationmentioning

confidence: 99%

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Influence of inlet pressure on cavitation characteristics in regulating valve

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The cavitation development process in regulating valve under different inlet pressures is investigated experimentally and numerically in our paper. The influence of inlet pressure P in on cavitation location, shape, area and intensity is studied in axial and radial directions, and the axial and radial pressure distributions are also analyzed. The cavitation is generally annular in shape radially and irregular polygon in shape axially. Cavitation bubbles occur at the throat entrance when the inlet pressure increases. The bubbles then accumulate, and a bubble ring is formed. The cavitation development process under different inlet pressures is separated into three stages, no-cavitation, initial cavitation and steady-cavitation stages. During the no-cavitation stage, no bubbles exist. During the initial cavitation stage, bubbles occur and the area and intensity of cavitation increase in the radial and axial directions with increasing inlet pressure. During the steady-cavitation stage, the calculation area and intensity of bubble rings reach their maximum values and then remain stable. The cavitation bubbles extend downstream, and the area of cavitation ring and cavitation intensity increase with increasing inlet pressure. A slit exists between the upper and lower parts of bubbles in the cavitation process, both parts touch each other forming a whole.

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Section: Cavitation Development Process In Radial Directionmentioning

confidence: 96%

Section: Numerical Simulationmentioning

confidence: 99%

Influence of inlet pressure on cavitation characteristics in regulating valve

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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“…19,21 The structure is also basically the same as that of the throttling section of the black water angle valve and liquid level control valve in our previous investigation, and the size is slightly different. [22][23][24] Although previous studies have systematically simulated the depressurized flow characteristics and cavitation erosion failure of the pressure-reducing valve, there is still a lack of specific experimental verification. In this paper, the visualized cavitation experimental equipment is designed and constructed to observe the cavitation evolution process photographed by the high-speed camera.…”

Section: Introductionmentioning

confidence: 99%

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Duan

Wang

et al. 2022

Energy Science & Engineering

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For the phenomenon of widespread and serious cavitation damage in the throttling section of pressure reducing valve under high temperature and high pressure in the chemical technology process of petroleum and coal, according to actual coordination structure widely applied between the valve core and valve seat, the cavitation throttling section with symmetrical contraction and expansion was made, and the visualized cavitation water tunnel experimental apparatus was designed and constructed. The cavitation evolution process with time under different cavitation numbers σ was recorded by the highspeed photography, the variation law of cavitation damage length and area with time was investigated by using aluminum film as cavitation damage carrier. Based on the experimental cavitation characteristic length L*, the evaporation coefficient F v , and condensation coefficient F c in the Zwart-Gerber-Belamri cavitation numerical model were modified, and the cavitation damage region was predicted by the gas phase condensation rate of numerical simulation. The results show that with the decrease of cavitation number, the characteristic length of cavitation strip increases; the cavitation characteristic length fluctuates greatly at σ = 1.22, and there are cavitation cloud periodic formation, shedding, collapse, and disappearance at the tail of the cavitation strip on the upper valve seat; the cavitation damage length of the upper and lower valve seat remains unchanged with time, and the cavitation damage area increases approximately linearly with time; the initial position and length of cavitation damage predicted by the gas phase condensation rate are basically consistent with the experimental results, which verifies the accuracy of the modified numerical simulation.

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“…It is of great significance for clean and efficient utilization of coal resources (Li et al 2019). The high-pressure black water and grey water treatment systems in coal gasification plant contain high concentration of pulverized coal particles, and the content of particles in some media is even as high as 12% ~ 15% (Zheng et al 2016). In the process of pipeline transportation containing solid particles, the failure of valves and pipelines caused by impact accounts for more than 40% of all failure forms, which seriously affects the stability of transportation process and the safe operation of equipment (Chen et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Experiment on Erosion Wear Characteristic of NiWC35 Coating and Sintered WC under High-Speed Impacting of Solid Particle

2021

JAFM

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Erosion wear caused by solid particles is a big challenge in the oil and gas industry, which seriously threatens the long-term safe operation of the equipment. A novel experimental apparatus was set up to meet the requirements for accelerating erosion wear research process for abrasion resistant materials, with a capability of producing high speed particles to impact target specimen. The erosion wear experiments of NiWC35 coating and sintered WC were conducted under different amounts of abrasive, temperatures, and impact angles respectively. Their macroscopic and microscopic erosion damage morphology and mechanism were discussed and analyzed. The results show that the amount of abrasive, temperature and impact angle have a more significant effect on the erosion wear of NiWC35 coating than sintered WC. The erosion rate of NiWC35 coating increases approximately linearly with the increase of the amount of abrasive; the impact angle of the NiWC35 coating is smaller, the range of erosion pit is wider; while the erosion wear morphology and erosion rate of sintered WC basically unchanged under different variables, countless fine irregular particles in the microscopic surface is the key to excellent abrasion resistance of sintered WC.

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A combined numerical-experiment investigation on the failure of a pressure relief valve in coal liquefaction

Cited by 23 publications

References 22 publications

Influence of inlet pressure on cavitation characteristics in regulating valve

Influence of inlet pressure on cavitation characteristics in regulating valve

Experiment and numerical simulation investigation on cavitation evolution and damage in the throttling section of pressure reducing valve

Experiment on Erosion Wear Characteristic of NiWC35 Coating and Sintered WC under High-Speed Impacting of Solid Particle

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