高压条件下含有非凝结性气体的水蒸气凝结传热模型研究

Research on Steam Condensation Heat Transfer Model in Presence of Non-condensable Gas at High Pressure

研究高压条件下含有非凝结性气体的水蒸气凝结传热过程对于小型堆的安全非常重要。当前对这一物理过程的研究集中于压力较低的工况,高压条件下的研究尚不成熟。本文建立了一种适用于高压条件下含有非凝结性气体的水蒸气自然对流凝结传热理论模型,使用真实气体状态方程求解扩散方程中摩尔浓度梯度和分压梯度之间的关系,取代了前人方法中的理想气体假设。计算结果与已有的实验数据吻合较好,证明本方法可用于小型堆紧凑型安全壳和汽-气稳压器等安全级设备的热工分析。

The research on the steam condensation heat transfer in presence of non- condensable gas at high pressure is vital in the safety of small reactors. Now the research of this physical problem mostly focuses on the low pressure condition, and the research on the high pressure condition is quite immature. The steam condensation heat transfer model in presence of non-condensable gas at high pressure was established in this paper. Instead of the ideal gas assumption, the real gas state equation was adopted to determine the relationship between the concentration gradient and partial pressure gradient in the diffusion equation. The model results coincide well with the existing experiment data, and it is indicated that this approach can be used for the thermohydraulic analysis in the gas-steam pressurizer, compact containment and other nuclear sa{ety related equipments.