施工期悬沙扩散对电厂取水影响的数值模拟研究

Numerical simulation study on impacts of suspended sediment diffusion on water intaking during construction period for power plant project

以某电厂工程为背景,采用二维潮流、泥沙数学模型的研究手段,对施工期间由于围堤建设、基建挖泥等引起的悬浮泥沙扩散对高温堆取水的影响进行了模拟研究,计算了高温堆运行阶段取水口处的最大含沙量,预测了取水口附近的泥沙淤积厚度。研究结果表明:(1)施工期高温堆运行阶段,涨潮对取水口的影响要大于落潮;(2)高温堆取水口处悬沙含量最大在0.135 kg/m3,满足施工期间高温堆取水口处悬沙含量不大于0.2 kg/m3的要求,同时高温堆所在的北侧取水明渠内,泥沙每天淤积在0.2 mm至0.5 mm范围,这种量级的淤积对高温堆的取水以及整个北侧明渠的泥沙淤积影响是很小的,短期施工不会产生强淤影响高温堆取水安全。

Taking a power plant project as background, a was used to evaluate the influence on water intaking caused by 2-D numerical model for tidal current and sediment sediment diffusion during the period of construction, and it was also used to calculate the maximum sediment concentration at water inlet and to predict the siltation near the water inlet. Research results show that： （1） during the phase of high temperature reactor operation, the influence on water intaking in flood period is greater than in ebb period; （2） the maximum sediment concentration at water in- let is 0.135 kg/m3, and it satisfies the requirement of less than 0.2 kg/m3when the high temperature reactor is operat- ing. In addition, sediment deposition in the north water intaking channel is only 0.2-0.5 mm/d, this kind of deposi- tion only gives little influence to the high temperature reactor for water intaking and to the whole deposition of north water intaking channel. Therefore, short-term construction will not produce great deposition to affect the safety of in- take water during the high temperature reactor operation.