Experimental research on influencing factors of temperature stratification in suppression pool
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摘要: 对于小型模块式反应堆，可采用安全壳抑压装置限制失水事故引起的安全壳快速升温升压。然而随着排放质量流率及水池水温的变化，水池中可能出现温度分层现象，进而降低传热传质效果。建立了抑压排放水池温度分层实验装置，开展了蒸汽质量流率、鼓泡器淹没深度及气水容积比对水池温度分层特性影响的实验研究。结果表明：在较宽的蒸汽质量流率范围内，水池内均发生了温度分层现象，随着质量流率增大，对分层的影响程度减弱，冷热交界面下移，带动更多水体参与热量交换；鼓泡器淹没深度增加导致热交界面位置下移，水体搅动作用增强，从而提高水体冷却利用率；气水容积比增大，冷热交界面下移，受扰动区域增大。Abstract: For small modular reactors, containment suppression devices can be used to limit the rapid increasement of temperature and pressure in the containment caused by loss of coolant accidents (LOCAs). However, temperature stratification may occur in the suppression pool with the change of the mass flow flux and water temperature during the process of discharge, which reduces the heat and mass transfer. In this paper, an experimental facility for temperature stratification of suppression pool is established. The effects of steam mass flow flux, submerged depth of sparger and gas-water volume ratio on the temperature stratification characteristics in the pool are studied. Results show that there is temperature stratification in the pool at a wide range of steam mass flow flux. With the increase of mass flow flux, the influence on stratification is weakened, and the thermal interface moves down, leading to more water participating in heat exchange. With the increase of the submerged depth of sparger, the position of thermal interface moves down and the stirring effect of water is enhanced. As the gas-water volume ratio increases, the thermal interface moves down and the disturbed area enlarges.
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Key words:
- suppression pool /
- mass flow flux /
- thermal interface /
- temperature stratification
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图 2 不同蒸汽质量流率下水池温度瞬态图
Figure 2. Temperature transient diagram of pool at different steam mass flux
图 3 冷热交界面机理形成示意图
Figure 3. Schematic diagram of formation mechanism of thermal interface
图 4 淹没深度2.2 m时水池温度瞬态图
Figure 4. Temperature transient diagram of pool at submerged depth of 2.2 m
图 5 不同淹没深度下水池高度方向温度分布
Figure 5. Temperature distribution in pool height direction at different submerged depths
图 6 气水容积比0.56时水池温度瞬态图
Figure 6. Temperature transient diagram of pool while gas-water volume ratio equals 0.56
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