均匀碎片床与分层碎片床干涸现象及热流密度实验研究

邹文斌; 佟立丽; 曹学武

doi:10.13832/j.jnpe.2024.01.0060

均匀碎片床与分层碎片床干涸现象及热流密度实验研究

doi: 10.13832/j.jnpe.2024.01.0060

上海交通大学机械与动力工程学院，上海，200240

基金项目: 国家自然科学基金（U1967202）

详细信息

作者简介:
邹文斌（1998—），男，博士研究生，现从事反应堆严重事故研究，Email：zouwenbin@sjtu.edu.cn

通讯作者:
佟立丽，E-mail: lltong@sjtu.edu.cn

中图分类号: TL364
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- 被引次数: 0
出版历程
- 收稿日期: 2023-03-29
- 修回日期: 2023-04-13
- 刊出日期: 2024-02-15

Experimental Study on Dryout Heat Flux of Homogeneous Debris Bed and Stratified Debris Bed

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

摘要

摘要: 碎片床的可冷却性是反应堆严重事故缓解策略关注的问题，碎片床结构对其可冷却性有重要影响。本文搭建了体积加热碎片床可冷却性实验装置，开展了均匀碎片床、轴向分层碎片床、径向分层碎片床的可冷却性实验，揭示了不同类型碎片床的干涸特性，获得了干涸热流密度（DHF）。研究结果表明：均匀碎片床条件下，小颗粒较大的气液流动阻力使得渗透率下降，导致小颗粒均匀碎片床DHF较小；轴向分层碎片床条件下，由于分层界面孔隙率降低引起的较大阻力，导致轴向分层碎片床DHF远小于顶部小颗粒组成的均匀碎片床DHF；径向分层碎片床条件下，由于小颗粒层较大的气液流动阻力会引起蒸汽向大颗粒层迁移和聚集，导致DHF低于大颗粒组成均匀床的DHF。
- 严重事故 /
- 分层碎片床 /
- 可冷却性 /
- 干涸热流密度（DHF）
Abstract: The coolability of debris bed is a concern for reactor severe accident mitigation strategies, and the structure of debris bed has a significant impact on its coolability. In this paper, an experimental facility for the coolability of volumetrically heated debris bed was established, and the experimental study on the coolability of homogeneous, axial stratified, and radial stratified debris beds was carried out to compare and analyze the dryout phenomenon and heat flow flux for different debris bed types. The results show that under the condition of homogeneous debris bed, the larger gas-liquid flow resistance of small particles makes the permeability decrease, which leads to the smaller DHF of small particle homogeneous debris bed; under the condition of axial stratified debris bed, the DHF of axial stratified debris bed is much smaller than that of homogeneous debris bed composed of small particles at the top due to the large resistance caused by the decrease of porosity at the stratified interface; under the condition of radial stratified debris bed, due to the large gas-liquid flow resistance of small particle layer, steam will migrate and accumulate to large particle layer, resulting in DHF lower than that of the homogeneous bed composed of large particles.
- Severe accident /
- Stratified debris beds /
- Coolability /
- Dryout heat flux (DHF)

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图 1 实验装置示意图　mm

Figure 1. Diagram of the Experimental Facility

下载: 全尺寸图片幻灯片

图 2 床-1的温度响应

采用温度飞升表示干涸，其余测点温度均集中于饱和温度附近，表明其余位置未发生干涸

Figure 2. Temperature in Homogeneous Bed-1

下载: 全尺寸图片幻灯片

图 3 轴向分层碎片床的温度响应

采用温度飞升表示干涸，其余测点温度均集中于饱和温度附近，表明其余位置未发生干涸

Figure 3. Temperature in Axial Stratified Beds

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图 4 径向分层床干涸位置局部图

Figure 4. Partial Diagram of Dryout Location of Radial Stratified Beds

下载: 全尺寸图片幻灯片

图 5 径向分层碎片床的温度响应

采用温度飞升表示干涸，其余测点温度均集中于饱和温度附近，表明其余位置未发生干涸

Figure 5. Temperature in Radial Stratified Beds

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图 6 大颗粒层顶部蒸汽聚集

Figure 6. Vapor Accumulation at the Top of Large Particle Layer　　　　　　

下载: 全尺寸图片幻灯片

图 7 不同碎片床DHF的对比

Figure 7. Comparison of Dryout Heat Flux of Different Debris Beds　　　　　　

下载: 全尺寸图片幻灯片

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