Optimization of an intermediate heat exchanger for a natural circulation molten salt pebble-bed reactor

XUE Chunhui; DONG Yujie

doi:10.16511/j.cnki.qhdxxb.2018.22.021

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (5) : 445-449. DOI: 10.16511/j.cnki.qhdxxb.2018.22.021

NUCLEAR AND NEW ENERGY TECHNOLOGY

Optimization of an intermediate heat exchanger for a natural circulation molten salt pebble-bed reactor

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Abstract

The nuclear hot spring design concept for molten salt pebble-bed reactors features full power natural circulation with the intermediate heat exchanger (IHX) providing most of the pressure drop in the primary loop outside the core. The IHX flow resistance efficiency is improved here using numerical simulations of the flow and heat transfer characteristics in the flow channel of the IHX. Response surfaces are given for the influences of the structural parameters on the flow resistance coefficient, the Colburn factor and the comprehensive evaluation factor. Optimal fin dimensions are given for small pressure drops but high heat transfer efficiencies based on a multi-objective genetic optimization scheme. An IHX is then designed using the optimized fin parameters through the Aspen software with a 30% decrease of the overall volume of the IHX.

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intermediate heat exchanger / molten salt pebble-bed reactor / multi-objective optimization / computational fluid dynamics (CFD)

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XUE Chunhui, DONG Yujie. Optimization of an intermediate heat exchanger for a natural circulation molten salt pebble-bed reactor[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(5): 445-449 https://doi.org/10.16511/j.cnki.qhdxxb.2018.22.021

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