Design of Laminated Seal in Cryogenic Triple-Offset Butterfly Valve Used in LNG Marine Engine

Kwak, Hyo Seo; Seong, Hansaem; Kim, Chul

doi:10.1007/s12541-019-00056-6

Cited by 17 publications

(12 citation statements)

References 11 publications

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“…The maximum contact stresses in case of the slope angle of 66.1° were reduced by 65.5%, 42.6%~15.8%, and 18.3%~7.3%, and those in case of the slope angle of 86.1° were reduced by 66.5%, 48.8%~29.9%, and 35.8%~12.7%, respectively, which means that the shape design of the laminated seal allows to mitigate the excessive contact stress. On the basis of the previous study in relation with the cryogenic triple-offset butterfly valve with the laminated seal, which is installed in liquefied natural gas (LNG) marine engine, to control the flow of liquid nitrogen (−196 °C) to liquefy natural gas [25], the contact stress behaviors under the three different temperatures (−196 °C, 25 °C, and 350 °C) were analyzed to discover the graphite effect Analyses results of the new laminated seal at 350 • C were compared to those at the 1-layer, 3-layer, and 5-layer models in Table 7. The maximum contact stresses in case of the slope angle of 66.1 • were reduced by 65.5%, 42.6%~15.8%, and 18.3%~7.3%, and those in case of the slope angle of 86.1 • were reduced by 66.5%, 48.8%~29.9%, and 35.8%~12.7%, respectively, which means that the shape design of the laminated seal allows to mitigate the excessive contact stress.…”

Section: Results Of the Thermal-structural Analysismentioning

confidence: 99%

“…The maximum contact stresses in case of the slope angle of 66.1 • were reduced by 65.5%, 42.6%~15.8%, and 18.3%~7.3%, and those in case of the slope angle of 86.1 • were reduced by 66.5%, 48.8%~29.9%, and 35.8%~12.7%, respectively, which means that the shape design of the laminated seal allows to mitigate the excessive contact stress. On the basis of the previous study in relation with the cryogenic triple-offset butterfly valve with the laminated seal, which is installed in liquefied natural gas (LNG) marine engine, to control the flow of liquid nitrogen (−196 • C) to liquefy natural gas [25], the contact stress behaviors under the three different temperatures (−196 • C, 25 • C, and 350 • C) were analyzed to discover the graphite effect at each temperature. In the stainless steel layer, the contact stress was increased at 350 • C as a result of undergoing thermal expansion, while in the graphite layer, the larger contact stresses were observed at 350 • C and −196 • C rather than 25 • C, which indicates that the graphite is a favorable for sealing property at severe temperature.…”

Section: Results Of the Thermal-structural Analysismentioning

confidence: 99%

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Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

et al. 2019

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In combined cycle power plants (CCPPs), the bypass butterfly valve is a key component to facilitate regulation of exhaust gas energy available at the turbine and to not produce too much boost pressure. The conventional damper valve causes leakage, back flow into the turbine, and damage of the blade, and the existing dual-layered seal with polytetrafluoroethylene (PTFE) and metal should be frequently replaced owing to its low durability and deterioration of mechanical properties under a high temperature. This study devised a triple offset butterfly valve with a new type of seal by alternatively laminating stainless steel and graphite to improve valve performance at the high temperature (350 °C). The slope angles of the seal contact surface to prevent friction were calculated using the mathematical models of the triple offset. Thermal-structure coupled analyses by varying the number of graphite and thickness were conducted, and the seven-layer model with the graphite thickness of 0.8 mm, which shows airtightness and smooth operation, was chosen. The contact stresses behaviors of the graphite at 350 °C and at −196 °C were investigated, and it was found that the graphite is in charge of improving driving performance of the disc at the high temperature and sealing performance at the cryogenic temperature. The performance tests and the field tests of the suggested model verified its performance at the working temperature.

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Section: Results Of the Thermal-structural Analysismentioning

confidence: 99%

Section: Results Of the Thermal-structural Analysismentioning

confidence: 99%

Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

et al. 2019

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“…[26] There have been studies conducted in the past on the design of essential valves for cryogenic use in general and for liqui ed natural gas (LNG) in particular, but none of them have addressed valves for liquid hydrogen. [27,28,29,30,31] The rst study referred to, examines the thermal conductivity of a smallsized globe valve operating in LNG at a temperature of -169°C. [27] Globe valves are widely used in ow regulation in the oil and gas industry.…”

Section: Introductionmentioning

confidence: 99%

“…[29] In contrast to the previous reviews that analyzed only the metallic parts of cryogenic valves, the third study proposes a laminated seal for triple offset butter y valves in LNG plants. [30] The primary research question involves the design and validation of a seal for triple offset butter y valves in an LNG marine plant operating at a temperature of -196°C. [30] The key idea of this paper is to design and validate an optimized seal by considering the effects of design parameters such as pressure and temperature in order to improve sealing performance.…”

Section: Introductionmentioning

confidence: 99%

Valve design considerations in liquid hydrogen systems to prevent failure

Sotoodeh

Gudmestad

2022

Int J Interact Des Manuf

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Hydrogen has potential as an alternative source of energy (energy carrier) because it can be converted, stored, and used e ciently, with a wide range of applications. It can be created from renewable energy sources and can thus serve as storage of renewable energy like wind-and sun-power. It has been several decades since liquid hydrogen has been used as a fuel in space technology, however, the Space Shuttle Challenger disaster in 1986, was caused by seals leaking due to low outside temperature; the night of January 28 th 1986 was freezing cold. This underlines the importance of cautious use of hydrogen.It shall be noted that Hydrogen lique es at -252.9°C (-423°F), so cryogenic systems and sophisticated insulation techniques are necessary. Furthermore, steel is susceptible to hydrogen induced cracking.Control of the ow has always been carried out by valve assemblies in processing plants. The proper design of industrial valves in every industry, including hydrogen systems, can signi cantly improve the safety and reliability of the valves speci cally, as well as the plant as a whole. An overview of various previous studies is presented in this paper, discussing important design concepts for cryogenic valves. The main research question is to determine what are the main design considerations for valves used in liquid hydrogen, so as to minimize the risk of leakage from the valves to ensure required safety. In this study, different aspects of valve design for liquid hydrogen are examined, such as selection of steel materials, steel wall thickness calculations, stem design, sealing material selection, re-safe design, cavity over-pressure protection, and body and bonnet extension. The effects of the outside temperature will also be discussed.

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“…Butterfly valves are widely applied in many fields, such as steam power generation, nuclear power plant, petrochemical industry and oil tankers since they are light in weight, low-cost and convenient to operate [1][2][3]. They save space for operation compared with sluice valves and save manufacturing costs compared with ball valves.…”

Section: Introductionmentioning

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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Design of Laminated Seal in Cryogenic Triple-Offset Butterfly Valve Used in LNG Marine Engine

Cited by 17 publications

References 11 publications

Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

Design of Laminated Seal for Triple Offset Butterfly Valve (350 °C) Used in Combined Cycle Power Plants

Valve design considerations in liquid hydrogen systems to prevent failure

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

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