红沿河核电站取水口海冰堆积特性的离散元分析

在寒冷地区,海冰在核电站取水结构物前的堆积会对取水口造成阻塞和损坏,进而影响核电设备的正常运作。以红沿河核电站的取水设施为例,综合考虑该工程海域冰区特点及风和流的作用等因素。建立了海冰的离散元模型,用于模拟海冰在结构物前的堆积和破坏过程。该离散元模型由规则排列的球体颗粒构成,颗粒间采用平行黏结模型进行黏结。考虑了海冰的平均尺寸、密集度及流速三个因素对海冰堆积过程的影响,对海冰堆积高度进行预判。其中,堆积高度随海冰的密集度和流速的增大而增大,而海冰的平均尺寸对堆积高度没有明显影响。分析结果表明,离散元数值模拟可用于评估和预测取水工程中海冰堆积造成堵塞的风险。

Analysis of sea ice pile up features in water intakes of nuclear power station by discrete element method

In cold regions, the pile up of ice before the water intake structure of the nuclear power plant jams the water intake, and affects the normal operation of nuclear power equipment. This paper takes the water intake facilities of nuclear power plants as an example, and takes into account the characteristics of the ice area of the project and the role of wind, flow and other factors. The discrete element method (DEM) of sea ice is established to simulate the pile-up and failure process of sea ice before the structures. The discrete element model consists of regularly arranged spherical particles with parallel bonding models. The influences of the ice average size, ice concentration and the velocity of flow on the process of sea ice pile-up are considered to prejudge the height of sea ice pile-up. The pile up height increases with the increasing concentration of sea ice and velocity of flow. The average size of sea ice has no significant effect on the pile-up height. Therefore, the numerical simulations by DEM can be adopted to assess and predict the risk of jamming caused by the pile-up of sea ice in the water intakes.