内陆核电液态流出物排放口型式优化研究

Study on optimization of inland NPP liquid effluent outfall type

液态流出物排放方式优化是内陆核电重点关注的问题之一,本文针对国内某内陆核电厂址液态流出物排放口型式进行优化研究,以提高初始稀释度,降低液态流出物排放对环境水体的影响。选取CORMIX软件作为优化工具,采用河道实体模型试验近区稀释度测量结果对CORMIX断面概化合理性进行了验证分析,在此基础上对单喷口和多喷口排放的出流水平方位角、垂向仰角、出流流速,多喷口间距等参数进行了优化,提出了各参数适宜的取值范围。研究表明,本厂址水深有限,采用水平深层排放加强垂向掺混能获得更好稀释效果,同等环境流速、水深,采用相同的排放仰角、排放流速和排放位置等设计参数,多喷口排放型式稀释效果优于单喷口。本文结果可供工程设计和相关研究参考。

Optimization of liquid effluent discharging approach is an important problem for inland NPP. Inthis paper,the discharging outfall type of a planned Chinese inland NPP site is optimized to raise the ini-tial mixing rate and decrease the impact of effluent on the marine environment. CORMIX is used as the op-timization software in this study. The measured mixing data of a scaled field model is used to verify thefeasibility of schematization of the water body＇s geometry parameter in CORMIX. Then the parameters suchas horizontal angle,vertical angle,discharge velocity,and port spacing are optimized for single port dis-charge type and multiport diffuser discharge type. Optimal value range for these discharge parameters is giv-en. Since the environmental water depth is shallow in the studied NPP site, the nearly flat and deeplyplaced outfall type is more efficient in mixing. Different type comparison shows the mixing rate of the diffus-er discharge type is better than the single port discharge type with same discharge vertical angle and initialvelocity in the same environmental water velocity and water depth condition. The result provides useful refer-ence for the project design and similar other studies.