流化床反应器内热动力特性的数值模拟

Simulation of thermodynamics in a fluidized bed reactor

摘要:

为了深入研究流化床反应器内温度分布特性,基于分群扩散理论方法,应用中子输运模型、耦合气固传热模型以及气固双流体模型,数值模拟流化床核反应器内气固流动和热动力特性,研究流化床核反应器内入口氦气流量和燃料堆积床高对反应器内温度分布的影响．研究结果表明,流化床核反应器内气相温度分布比较均匀；随着入口氦气流量的增加,反应器内环形区域和中心区域内气相温度脉动增强；反应器内气相温度随着燃料堆积床高的增加而升高．数值模拟得到核反应器内气相瞬时温度分布的结果与Pain等人数值计算结果相吻合．

Abstract:

Thermodynamic properties in a fluidized bed nuclear reactor were simulated by means of two-fluid model coupled heat conduction model. Neutron transport equation was used based on group diffusion method. The effect of velocity of inlet coolant and different packing height on the temperature distribution was studied. Results showed that the gas temperature was uniform in a fluidized bed nuclear reactor. The temperature fluctuation strengthened with the velocity of inlet coolant in the annular and center zones, and the gas temperature was raised with the increase of packing height. The simulation result of instantaneous gas temperature was in an agreement with the calculation results of Pain et al.