淡水下泄对电站海水脱硫系统的影响分析

为了了解淡水下泄对电站海水脱硫系统的影响，本文采用Mike 21 Transport模块对越南某电厂工程附近开通运河后HCO₃-离子进行了潮流和离子对流扩散数值模拟分析。研究选取2015—2016年上游径流流量实测资料，模拟了电厂典型大潮、小潮情况下HCO₃-离子的扩散过程，得出12个月份电厂取水口处HCO₃-离子浓度。计算结果表明:7—9月径流流量突增引起淡水下泄影响较大，取水口HCO₃-平均浓度小于90 mg/L，最小平均浓度为78.32 mg/L，其余月份均在95 mg/L左右。根据不同月份的海水HCO₃-浓度，通过改变电厂脱硫泵数量、选用不同含硫煤等措施，既能保证电场海水脱硫效率又能控制工程造价得以实现。

Analysis on the influence of freshwater discharge on seawater desulphurization system of power plant

In order to understand the effect of the freshwater letdown on the seawater desulfurization of the power plant, a hydrodynamic and transport model of Mike 21 were adopted to simulate tidal flow field and convection diffusion filed.The convection diffusion of HCO₃- of spring tide and neap tide was simulated for 12 months, according to the upstream runoff rate measured data.The simulation results show that, the effect of freshwater letdown is bigger during July to September, the concentration of HCO₃- is less than 90 mg/L, and the minimum value is 78.32 mg/L.In the other months, the concentration is about 95 mg/L.According to the results above, it could ensure the desulfurization efficiency of electric field seawater and control the construction cost, by changing the number of desulfurization pumps and selecting different sulfur-containing coals.