越南某电厂温排水数值模拟

Numerical simulation study on the thermal water discharge of one power plant in Vietnam

为了解越南某电厂新建一期三期工程对已投入运行的二期工程取水口温升的影响,采用MIKE21中的潮流和温度输运模块进行了潮流和温度场的数值模拟。选取冬季和夏季两种气象背景,模拟了典型大潮、小潮情况下一、二、三期工程同时运行时的温度场扩散过程,得出不同工况下的温升包络图。模拟结果表明:一期和三期工程投入运营后,二期工程取水口温升不超过1℃,符合使用条件。针对工程中的透水防波堤,文章提出了杜比公式与MIKE模型相结合的模拟方法,并根据计算结果分析了防波堤的透水性对温度场扩散的影响。结果表明,防波堤透水性对温度场扩散影响显著。

In order to understand the effect of the newly-built Phase I and III project on the Phase II project of one power plant of Vietnam,a hydrodynamic and transport model of MIKE 21 were adopted to simulate tidal flow field and water temperature field. The thermal water diffusion process in the synchronizing operating case of Phase I,II and III,for both the case of spring tide and neap tide,summer and winter,were simulated. The simulation results show that the rise of water temperature around the water intakes in Phase II project does not exceed 1℃ after the Phase I and II projects putting into operation,which meets the requirements of operation. A combination method of Dupuit formula and MIKE 21 model was proposed to simulate the permeable breakwater,based on which,the effect of the permeability of the rubble mound breakwater on thermal water diffusion was evaluated. The results show that the permeability of breakwater has a great effect on thermal water diffusion.