Local Stress-Strain Behavior of a High-Temperature Steam Valve Under Transient Mechanical and Thermal Loading

Marek, A.; Okrajni, J.

doi:10.1007/s11665-013-0744-3

Cited by 20 publications

(13 citation statements)

References 4 publications

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“…In the present study, the thermal exchange effect was considered for the steam and the walls and also for the walls and the ambient air by setting the heat transfer coefficient as W/(m 2 K). The relatively small coefficient 4 W/(m 2 K) was used for simulating thermal exchange effect between the thermally insulated pipes and the air for comparative studies [23,24].…”

Section: Mesh and Boundary Conditionmentioning

confidence: 99%

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Kan

Chen

2020

J Braz. Soc. Mech. Sci. Eng.

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The link rod butterfly valve, which uses a four-bar linkage mechanism to drive the valve plate, is a promising candidate for treating high-temperature steam and industrial exhaust because of its reliable sealing property. In this paper, the 3D flow field in the link rod butterfly valve for high-temperature steam was simulated using computational fluid dynamics. The flow coefficient of the valve, the velocity field, the temperature distribution and the enthalpy change in the steam under different valve openings were studied. The results showed that the flow coefficient of the link rod butterfly valve increased with an accelerated slope as the rotation angle of the valve stem was enlarged over 60°. The velocity and the vorticity of the steam were dramatically increased near the valve. The steam branches were accelerated up to 15 times the inlet flow velocity when they passed through the gaps between the valve plate and the valve body, and the vorticity was as large as 76/s. The temperature of the steam passing through the valve was decreased by 50-108 K for different openings. The temperature difference in the steam on the valve plate was as high as 400 K, which makes a challenge for the material of the valve plate. Larger enthalpy drop of the steam was resulted in when the valve was working at the throttling state than fully opened. Local peaks for the enthalpy drop were observed as the valve stem was rotated by 30° and 60°, and the local valley was at about 50°. The present study may serve as a useful reference for the design of link rod butterfly valves.

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Section: Mesh and Boundary Conditionmentioning

confidence: 99%

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Kan

Chen

2020

J Braz. Soc. Mech. Sci. Eng.

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“…Samad [8] analyzed the vibration characteristics of control valves of various shapes under the action of fluid exciting force to find that the vibration amplitude of a circular valve is lower than that of a flat or steep valve. Anelina [9] examined the stress and strain characteristics of a steam valve to find that changes in the time variable and non-uniform temperature field alter the local stress leading to metal fatigue.…”

Section: Introductionmentioning

confidence: 99%

Structure optimization design of high-temperature, high-pressure nuclear power valve

Wei

Chang

et al. 2020

DYNA

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The nuclear power valve is an important piece of equipment in any nuclear power system. The finite element method was used in this study to analyze the strength and rigidity of the high-temperature and high-pressure nuclear gate valve. The structural characteristics were optimized as per the parameters that affect the strength of the valve body. Fluid-solid coupling technology was utilized to investigate the temperature, deformation, and stress distributions in the structure. A high stress concentration was observed in the initial design; the maximum equivalent stress exceeded the allowable range. Three optimization methods were deployed in efforts to improve the stress distribution. The stress distribution was found to be more uniform post-optimization and the gate valve structure of all three schemes tested met the relevant stress requirements. The optimal scheme was then determined by further comparison. The results presented here may provide a theoretical reference for the optimization of nuclear power valve designs.

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“…After analysing the load status of individual devices of the cycle, it should be noted that particularly vulnerable to variable parameters of steam are boilers [4][5][6][7][8][9], then valves [10] and finally the first stages of the turbine [11][12][13][14][15]. To face these threats, it is necessary to increase the safety of operation of energy cycles including steam turbine type 18K370 [1][2][3].…”

Section: Introductionsmentioning

confidence: 99%

Issues to improve the safety of 18K370 steam turbine operation

Bzymek¹,

Badur

Ziółkowski

2017

E3S Web Conf.

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Abstract. The paper presents the process of improving the safety and reliability of operation the 18K370 steam turbines Opole Power Plant since the first failure in 2010 [1], up to install the on-line monitoring system [2]. It shows how the units work and how to analyse the contol stage as a critical node in designing the turbine. Selected results of the analysis of the strength of CSD (Computational Solid Dynamic) and the nature of the flow in different operating regimes -thanks to CFD (Computational Fluid Dynamic) analysis have been included. We have also briefly discussed the way of lifecycle management of individual elements [2,3]. The presented actions could be considered satisfactory, and improve the safety of operating steam turbines of type 18K370.

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Local Stress-Strain Behavior of a High-Temperature Steam Valve Under Transient Mechanical and Thermal Loading

Cited by 20 publications

References 4 publications

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Structure optimization design of high-temperature, high-pressure nuclear power valve

Issues to improve the safety of 18K370 steam turbine operation

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