Numerical analysis of the passive heat removal system for molten salt reactor at steady state

Wu, Xiangcheng; Yan, Changqi; Meng, Zhaoming; Chen, Kailun; Song, Shaochuang; Yang, Zonghao; Yu, Jie

doi:10.1016/j.applthermaleng.2016.03.176

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…To the best of our knowledge, the main numerical works on this topic were concentrated on either condensation or pool boiling individually, even the phase change was neglected. Furthermore, in all the previous studies, only the horizontal or nearly horizontal direction of the tubes was considered for condensation [1,19,30,35]. Previous studies [9,10,36,37], of the authors showed the potential improvement capacity of the condensation heat transfer coefficient when an inclination angle was imposed on the tube orientation In this paper, conjugate heat transfer, pool boiling outside and condensation inside a smooth tube were investigated numerically.…”

Section: Introductionmentioning

confidence: 99%

“…Besides the studies on condensation and pool boiling, some researchers have worked on the performance of passive heat removal systems numerically [18][19][20] and experimentally [21,22], in which both phenomena take place simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…The study also showed that 2% of nominal reactor power could be removed by the proposed design. Wu et al [19] proposed a numerical model to investigate the use of the passive system and investigate the interaction between the boiling loop and the condensing loop at steady-state conditions. The results showed that the mass flow rate in Literature reviews show that no numerical study has been conducted on conjugate pool boiling and condensation in passive heat removal systems.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Abadi

Meyer

2018

International Journal of Heat and Mass Transfer

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In this study, the effect of the tube inclination angle on simultaneous condensation inside and pool boiling outside a smooth tube is investigated numerically. Such conjugate phase-change phenomena happen in many heat exchangers, particularly in passive heat removal systems. The simulated domain is a pool filled with water liquid at atmospheric pressure, with a submerged tube with inner and outer diameters of 19 mm and 25 mm respectively. The fluid inside the tube is considered to be the steam at the saturation temperature of 250 °C, which is a very common operating condition in many heat removal systems. The flow field is considered to be turbulent, unsteady and three dimensional. The effect of conduction through the tube thickness is also taken into account. The Eulerian-Eulerian multiphase flow approach is utilized to express the governing equation of the problem. ANSYS FLUENT 17.1 is also used to solve the governing equations. The effects of various parameters, such as tube orientation, steam mass flux and inlet steam quality on the condensation and pool boiling heat transfer coefficients, are investigated. The results show good agreement with the available experimental data. The condensation heat transfer coefficient is found to increase with an increase in the inlet steam quality and steam mass flow rate. The results of the effect of inclination on the heat transfer coefficient are also compatible with the previous experimental works. Moreover, the results show that there is a partial maximum point for the total heat transfer coefficient at an inclination angle between θ = -60° and θ = -30°.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Abadi

Meyer

2018

International Journal of Heat and Mass Transfer

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“…Sun Lu et al conducted research on the conceptual design of a PRHRS for a 10 MW MSRE. Then based on this conceptual design, a series of experimental and numerical studies have been carried out . Wang et at proposed a new conceptual design of PRHRS by using heat pipes and conducted some analysis on the heat pipes performance in the system.…”

Section: Introductionmentioning

confidence: 99%

“…Then based on this conceptual design, a series of experimental and numerical studies have been carried out. [14][15][16] Wang et at 17 proposed a new conceptual design of PRHRS by using heat pipes and conducted some analysis on the heat pipes performance in the system. However, these PRHRS designs proposed for the MSR of Generation IV are all in the stage of theoretical design.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the heat transfer characteristics of fluoride salt in the new conceptual passive heat removal system of molten salt reactor

et al. 2018

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Summary A new conceptual design of a passive residual heat removal system (PRHRS) has been proposed for molten salt reactor. High‐temperature heat pipes are used in this new design to improve the system inherent safety and make the PRHRS more compact. An experimental system using fluoride salt FLiNaK has been constructed to validate and support the future design of PRHRS of molten salt reactors. In this research, tests on the natural convection heat transfer of FLiNaK in the drain tank with an inclined heat pipe inserted at different heights were performed. The temperature distribution of fluoride salt in the tank was analyzed. The height of heat pipe and the bulk temperature of FLiNaK have little influence on the normalized salt temperature distribution. However, with the height of heat pipe increasing, the temperature difference of molten salt decreases and heat transfer coefficient of natural convection increases. In addition, the empirical correlations of natural convection heat transfer between liquid FLiNaK and inclined heat pipe are obtained within the range of Rayleigh numbers from 3.97 × 106 to 1.16 × 107. The comparisons show that a good agreement with less than 5% deviation is obtained between the proposed correlations and the test data.

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Transient thermal‐hydraulic analysis of heat pipe cooled passive residual heat removal system of molten salt reactor

et al. 2020

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Summary As one of the representatives of fourth generation nuclear reactors, molten salt reactor technology has become the research focus worldwide. Higher passive safety requirements have been put forward for the nuclear reactor systems. In this paper, a conceptual design of a passive residual heat removal system for the molten salt reactor is presented and the mathematical and physical models are established. Based on FORTRAN programming language, the passive residual heat removal system analysis code is developed and validated. The code is used to analyze the safety of molten salt reactor under accident conditions, including unprotected reactivity introduction accident, unprotected overcooling, unprotected loss of flow, opening failure of the frozen valve and the startup accident of partial heat pipes. The results show that the passive residual heat removal system of molten salt reactor can discharge fuel salt decay heat effectively within 200 hours and ensure that the molten salt reactor to operate safely under all accident conditions. Above all, the system has good passive safety performance. The proposed passive residual heat removal system can satisfy the safety requirement of molten salt reactor. The feasibility of the conceptual design of the heat pipe cooled passive residual heat removal system is theoretically verified.

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Numerical analysis of the passive heat removal system for molten salt reactor at steady state

Cited by 12 publications

References 20 publications

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Experimental study on the heat transfer characteristics of fluoride salt in the new conceptual passive heat removal system of molten salt reactor

Transient thermal‐hydraulic analysis of heat pipe cooled passive residual heat removal system of molten salt reactor

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