Finite Element Study of Factor Effects on Residual Stresses and Thermal Deformation of Brazed Plate-Fin Structure

Chen, Hu; Gong, Jianming; Tu, S.T.; Geng, Lu Yang

doi:10.4028/www.scientific.net/kem.353-358.473

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…However, these works are mainly focused on the residual stress of PFS [6][7][8]. For example, in Chen's study [9], a two-dimensional model is established to analyze the residual stress of PFS in the brazing process. It is obtained that the residual stress have obviously influence for structural failure of PFS.…”

Section: Introductionmentioning

confidence: 99%

The relationship between stress of plate-fin structures and emergency stop operation process in LNG heat exchanger

Wang

Xie

et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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For insuring the safe operation of LNG heat exchanger in the Emergency Stop Operation Process (ESOP), a numerical method is proposed to investigate the stress of Plate-Fin Structures (PFS) in that. The relationship between stress of PFS and ESOP is analyzed in LNG heat exchanger. The results will be obtained that the maximum equivalent stress of PFS is greater at the initial stage of ESOP than that at the last stage when the HMR pressure is more than 5 MPa. The maximum equivalent stress increases with the equilibrium temperature when is greater than 180 K and reaches peak value at the last stage of ESOP. The maximum equivalent stress is larger at the last stage of ESOP than the other stage and increases with the equilibrium pressure. When the temperature difference is more than 5 K in the ESOP, the influence of that is obvious for the stress of PFS. In the ESOP, the equilibrium temperature and temperature difference should be controlled within 240 K and 5 K, respectively.

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Section: Introductionmentioning

confidence: 99%

The relationship between stress of plate-fin structures and emergency stop operation process in LNG heat exchanger

Wang

Xie

et al. 2021

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

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“…Before the introduction of Finite Element Method (FEM), analytical methods were used to solve these types of problem. Now with the advancement in FEM, a numerical method is one of the best solution to these types of problem [12]. In past studies, serrated fins were analyzed using a computational fluid dynamics (CFD) model and it was concluded that main cause of failure in fins were the fin brazed joints and keen edge geometries during the flow of fluid/gases.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Structural Reliability of LNG Processing Plate-Fin Heat Exchanger for Energy Conservation

et al. 2020

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Liquefied natural gas (LNG) is one of the hydrocarbon fuels with the least carbon footprint having a rapidly rising global share in the prime energy market. LNG processing for transportation at longer distances works under cryogenic conditions, especially when used for liquefaction and gasification applications. The supply chain of the eco-environmental friendly hydrocarbon is heavily dependent on the processing plant used for liquefaction and subsequent re-gasification of the natural gas. Plate-fin heat exchangers are extensively used in the LNG industry for both re-gasification as well as liquefaction processes. The exchange of heat during the process of natural gas phase change involves plate-fin heat exchangers working under cryogenic low-temperature conditions. The heat exchangers are designed to have brazed joints that are most vulnerable to failure under these temperature conditions. One failure of such a joint can not only hinder the supply chain but also may result in fire and life hazards. In almost all earlier studies, analytical and numerical methods were used to analyze these braze joints using finite element method methods and examining the stresses while keeping them at or near to ambient conditions. In this research, the plate-fin heat exchanger is investigated for its structural stability of brazed fins for three different fin configurations: plain, wavy and compound having different joint geometries. In addition, the analyses are carried out using experimentally measured brazed joint strength which is measured to be on average 22% lower than the base material strength owing to brazing process and resultant heat-affected zone (HAZ). Therefore, the reliability is assessed for these joints in terms of factor of safety (FOS) while keeping in view the actual yield criteria. It was found that the structural stability of compound fins configuration is weakest amongst all considered fin configurations. The failure of the compound fin brazed joint is expected to be along the horizontal path of the joint due to yielding. The study also predicts the life of the fin brazed joints in different joining directions with different topologies of fins commonly recommended in the literature. It is observed that the commonly recommended safe fin geometries are predicted to be susceptible to failure if a reduction in the brazed joint is considered. The analysis and recommendation in this paper shall provide a reliable and safe design approach for plate-fin exchangers for different operating conditions especially in low to cryogenic temperature applications.

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Finite Element Study of Factor Effects on Residual Stresses and Thermal Deformation of Brazed Plate-Fin Structure

Cited by 2 publications

References 6 publications

The relationship between stress of plate-fin structures and emergency stop operation process in LNG heat exchanger

The relationship between stress of plate-fin structures and emergency stop operation process in LNG heat exchanger

Predicting the Structural Reliability of LNG Processing Plate-Fin Heat Exchanger for Energy Conservation

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