电厂温排水淹没式排放的数值模拟研究

Study on Submerged Type of Thermal Discharge in Power Plant by Using Numerical Similation

电厂温排水长期排入周围水域,会对周围生态环境产生不利影响。在全球生态环境问题日益严重的情况下,对温排水的扩散特性进行研究具有重要的现实意义。利用FLUENT软件对电厂温排水淹没式排放方式进行了数值模拟,模拟结果与已有文献中水槽试验的结果基本一致,进而再利用该模型及方法对其它工况进行了数值模拟。结果表明,高温升区域主要集中在近区,随着远区的增加温升逐渐减小,温升2～1℃时扩散面积增加最明显;数值模拟相云图分析方法可用来获得最佳的温排水方案;在环境水流流速一定的情况下,温水向上扩散的面积与喷口流速成正比。其结论和方法对实际工程具有一定的参考价值。

The thermal discharge from power plants adversely affects its surrounding ecological environment if it is discarded for a long time,so it is of practical significance to study the diffusion characteristics of the thermal discharge as the global ecological environment problem becomes more and more serious. The submerged type of thermal discharge from power plants was simulated by using the FLUENT software. The simulation results for one case were compared with the experimental ones,which are basically consistent. And then,another three cases were also simulated. The results show that the temperature rise areas are mainly in the near area. Temperature rise becomes smaller gradually as the increase of distance. When the temperature rise is about 2 ~ 1 ℃,diffusion area will expand most significantly.The imagery analysis methods of numerical simulation are available to get the best thermal discharge plan. As ambient flow velocity is constant,the diffusion velocity is proportional to the area of the discharge port. Its conclusion and method have certain reference value to the actual project.