二维、三维低放废水数值模拟计算及污染分析

发布时间：2018-03-20 19:30

本文选题：低放废水　切入点：数值模拟　出处：《大连海事大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着我国经济的快速发展,对电力能源的需要越来越强烈,电力能源已经成人们社会生活必不可少的能源基础。核能发电作为一种非常具有潜力的发电方式,它具有资源无限、清洁、环保、高效等特点。然而核能发电的同时,低放废水的排放一直也是国内外关注的问题。传统的二维低放废水数值模拟,其计算方法忽略了放射性核素在垂向方向的迁移分布情况,不能真实地模拟放射性核素的浓度场分布情况,具有一定的局限性。相比于二维数值模拟,三维数值模拟计算,在处理复杂的地形、边界等问题上更加精确,计算考虑了低放废水在水平和垂向的运动,更加符合实际排放条件,使放射性核素的浓度分布情况更加真实地表达出来。本文针对上述问题,以某滨海核电设施为例,选取南海中尺度海域为二维计算海域,北部湾顶部海域为三维计算海域。首先分析总结了研究海域的地形、岸线、海洋水文特征以及周围环境敏感目标;阐述了低放废水对海洋环境和人类健康的影响,以及针对低放废水的排放,国家制定的相关标准和规范。其次采用了数值模拟方法,利用MIKE21/3,建立了二维、三维水动力数学模型,模型验证良好,并对研究海域的潮流场进行了分析;以放射性核素-氚为低放废水研究对象,分别对放射性核素-氚进行了二维、三维数值模拟计算;对比分析二维、三维低放废水浓度场分布,三维数学模型能更真实地模拟低放废水的排放;并假定排放源,分析了本次二维、三维计算结果对环境敏感目标无影响。最后通过本文研究,对核电设施排放口的选址和排放方案提供了一定的理论依据,对核电设施正常运行后,低放废水排放的管理和检测亦一定的指导作用。
[Abstract]:With the rapid development of our country's economy, the demand for electric energy is becoming more and more intense. The electric energy has become the essential energy base of people's social life. Nuclear power generation, as a very potential power generation method, has unlimited resources. Cleaning, environmental protection, high efficiency and so on. However, while nuclear power generation, the discharge of low-emission wastewater has always been a concern at home and abroad. Traditional two-dimensional low-emission wastewater numerical simulation, The calculation method ignores the vertical migration distribution of radionuclides, and can not simulate the distribution of radionuclides concentration field. It has some limitations. Compared with the two-dimensional numerical simulation, the three-dimensional numerical simulation can not simulate the distribution of radionuclide concentration field. It is more accurate in dealing with complex terrain and boundary problems. The calculation takes into account the horizontal and vertical movement of low level waste water, which is more in line with the actual discharge conditions. So that the concentration distribution of radionuclides can be expressed more truthfully. In this paper, taking a coastal nuclear power facility as an example, the mesoscale sea area of the South China Sea is selected as the two-dimensional calculated sea area. The top sea area of Beibu Gulf is a three-dimensional computational sea area. Firstly, the topography, shoreline, hydrological characteristics and sensitive target of surrounding environment of the study area are analyzed and summarized, and the influence of low level waste water on marine environment and human health is expounded. And the relevant national standards and norms for the discharge of low-emission wastewater. Secondly, the numerical simulation method is adopted, and the two-dimensional and three-dimensional hydrodynamic mathematical models are established by using MIKE 21 / 3. The model is well verified. The tidal current field of the studied sea area is analyzed, the radionuclide-tritium is taken as the research object of low-emission wastewater, the two-dimensional and three-dimensional numerical simulation of radionuclide-tritium is carried out, Three dimensional low level wastewater concentration field distribution, three dimensional mathematical model can simulate the discharge of low radioactive wastewater more truthfully, and assuming the discharge source, the two-dimensional and three-dimensional calculation results have no effect on the environmental sensitive target. It provides a certain theoretical basis for the site selection and discharge scheme of the discharge port of nuclear power facilities, and also has a certain guiding role in the management and detection of the discharge of low-emission wastewater after the normal operation of the nuclear power plant.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X771

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