核热泉堆是一种熔盐球床概念设计堆，具有满功率自然循环特性，中间换热器一次侧是一回路中除堆芯外主要的阻力来源。为降低中间换热器的阻力，提高换热效率，采用计算流体力学方法（CFD）对中间换热器单元流道的流动及其传热特性进行数值模拟，并构建换热器翅片阻力因子、Colburn因子和综合评价因子的响应面，利用多目标遗传算法对翅片的尺寸进行优化设计，并根据优化后的翅片尺寸基于Aspen软件进行换热器优化设计。优化后的换热器体积减小了30%。
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.
关键词
中间换热器 /
熔盐球床堆 /
多目标优化设计 /
计算流体力学方法(CFD)
Key words
intermediate heat exchanger /
molten salt pebble-bed reactor /
multi-objective optimization /
computational fluid dynamics (CFD)
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