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用HTGR未辐照ThO_2-UO_2球形元件进行了单球燃烧实验和日处理100球全尺寸移动床燃烧实验。单球燃烧过程为反应动力学和传质过程联合控制,完成一定转化率所需的无因次时间可分解为表征反应阻力和传质阻力的无因次项之和。线性回归得出化学反应速率常数表观值。移动床全尺寸连续燃烧实验表明,这种操作方式的优点为床内装量小,热功率释放平稳,易于控制。移动床燃烧可用拟均相一维模型描述。估算了稳态轴向温度分布,床壁给热系数估值与De Wasch-Froment关联式计算值接近。
The HTGR non-irradiated ThO_2-UO_2 spherical element was used to conduct the single-ball combustion experiment and the daily treatment of 100-ball full-scale moving bed combustion experiment. The single-ball combustion process is a combined control of reaction kinetics and mass transfer processes. The dimensionless time required to achieve a certain conversion rate can be decomposed into dimensionless terms that characterize reaction resistance and mass transfer resistance. Linear regression gives the apparent value of the chemical reaction rate constant. Full-size moving bed combustion test showed that the advantages of this mode of operation for a small amount of the bed, the thermal power released steady, easy to control. Moving bed combustion can be described by quasi-homogeneous one-dimensional model. The steady-state axial temperature distribution was estimated, and the estimation of bed heat supply coefficient was close to the De Wasch-Froment correlation calculation.