某滨海核电厂排水虹吸井淹没系数值域的选取及分析

Selection and analysis of the submerged coefficient of drainage siphon well in a coastal nuclear power plant

根据目前滨海厂址的共有特征,以某滨海厂址的工程数据为例,根据不同厂平标高的土石方量、机组不同布置方式及堰顶标高下循环水泵扬程的变化,总结出循环水系统运行最理想的淹没状态及其相应的淹没系数值域区间。根据不同设计潮位对淹没系数的要求,建议采用淹没泄流方式,设计低潮位下淹没系数取0.90作为上限,则其他设计潮位时的淹没系数均小于此值,在减少土石方工程量的同时实现循环水泵扬程最小。

Based on the common features of current coastal sites,a case study was made on a costal nuclear power plant.According to the change of circulating pump head with the amount of earthwork in different flat elevations,different arrangement modes of unit and different weir crest elevations,this paper summarized the most ideal submerged state and the corresponding range of value for submerged coefficient.According to the requirements on submerge coefficients with different designed tide levels,it was recommended that submerge discharging method should be taken and the top limitation for submerge coefficient at designed minimum tide levels should be 0.90.In this way,the submerge coefficient at other tide level would be less than 0.90;as a result,the earth work would be reduced and the minimum pump head would also be achieved.