On Burning Rate of Sodium Pool Fires

液体钠被用作快速增殖反应堆的冷却剂。在工作温度下，泄漏到大气中可能会导致火灾。这项研究的目的是获得钠燃烧的实验数据，为反应堆设施的设计和安全提供必要的数据。在本实验中，钠池在燃烧室中燃烧。通过氧耗测量和反应产物的化学分析，研究了氧氮浓度对着火温度和燃速的影响。并将测量的燃速与分析结果进行了比较。利用可视化技术对钠池燃烧的特性进行了研究。钠的火焰比油的火焰小得多，且仅限于液面附近。燃烧面积随熔池温度的升高而增大。2.氧浓度低于5摩尔%时不发生点火。3.点火温度随氧气浓度的增加而升高。4.氧气浓度越高，一氧化二钠的产率越低。5.在较低的氧气浓度下(10mol%)，燃烧速率的实验结果高于蒸汽层模型的计算结果。但在较高的氧浓度(21mol%)下，测定值低于计算值。6.随着熔池温度的升高，熔池表面形成的氧化钠残留量减少。

Liquid sodium is used as the coolant of fast breeder reactors. Spillage into atmosphere may lead to fires under the operation temperature. The purpose of this study is to obtain the experimental data of sodium burning which are necessary for the design and security of reactor facilities. In the present experiments sodium pool was burned in the chamber. The effect of oxygan concentration on ignition temperature and burning rate were investigated by the measurements of oxygen consumption and the chemical analysis of reaction products. The measured burning rate was compared with the analytical results. Characteristic behaviors of sodium pool burning were also investigated by visual technigues.1. The flame of sodium was much smaller than that of oil and was limited near the liquid surface. Burning area increased with increasing pool temperature. 2. No ignition occurred in the oxygen concentration less than 5 mol%. 3. Ignition temperature increased with increasing oxygen concentration. 4. The production rate of sodium monoxide was slightly lower with higher oxygen concentration. 5. In lower oxygen concentration (10 mol%) the experimental results of burning rate were higher than calculation by a vapor layer model. In higher oxygen concentration (21 mol%), however, the measured values were lower than the calulation. 6. The residue of sodium oxide which was formed on the pool surface decreased with increasing pool temperature.