【摘要】 针对严重事故下氢气容易在连通性较差的卸压箱隔间内聚集的问题，采用数值模拟的方法，构建了组分通量冷凝模型和多组分气体输运模型，开展了不同隔间开孔方案下安全壳内氢气输运特性的研究。结果表明，换热器表面的冷凝会引起周围氢气的聚集，而安全壳隔间的连通模式也会改变氢气的输运行为。当采用稳压器隔间顶部开孔的偏心布置时，尽管改变了氢气的循环模式，并且防止了稳压器隔间连通口进入燃爆风险区，但并不能有效地稀释上部空间的高浓度氢气；当采用稳压器隔间与环廊连通处开孔的侧面布置时，能促进氢气在下部区域的搅混，削弱氢气在穹顶区域的聚集，使高浓度氢气在安全壳内的空间占比从21%降低至4.3%，同时也使稳压器隔间连通口位于燃爆风险区的时间从中心布置下的90 s降低至6 s。更多还原

【Abstract】 In order to solve the problem that hydrogen is easy to accumulate in the compartments of pressure relief tanks with poor connectivity under severe accidents, numerical simulation methods are adopted to construct a component flux condensation model and a multi-component gas transport model, and the hydrogen transport characteristics in the containment with different compartment opening schemes are studied. The results show that the condensation on the surface of the heat exchanger will cause the accumulation of hydrogen around it, and the communication mode of the containment compartment will also change the hydrogen transport. When the eccentric layout of the top of the pressurizer compartment is adopted, although the hydrogen circulation mode is changed and the connecting port of the pressurizer compartment is prevented from entering the explosion risk area, the high concentration of hydrogen in the upper space can not be diluted effectively. When the side layout is adopted, it can promote the mixing of hydrogen in the lower zone and weaken the accumulation of hydrogen in the dome zone. As a result, the proportion of high-concentration hydrogen is reduced from 21% to 4.3%, and the time for the pressure regulator compartment connection ports to be located in the risk zone of explosion and combustion is shortened from 90 seconds in the central layout to 6 seconds.更多还原