深度过滤-烟道蒸发处理脱硫废水的数值模拟

脱硫废水烟道蒸发处理工艺所用喷嘴易被脱硫废水中悬浮颗粒物堵塞，为此提出与之配套的深度过滤脱硫废水预处理工艺，将脱硫废水在雾化蒸发前进行固液深度分离预处理。深度过滤处理后，脱硫废水中悬浮物质量浓度可以降低到40 mg/L，水中99%以上的固体颗粒粒径小于1 μm。通过建模理论计算和Fluent软件模拟，对脱硫废水深度过滤-烟道蒸发工艺进行研究，结果表明，烟气温度越高，雾化液滴粒径越小，越有利于雾化废水的蒸发。综合考虑蒸发效果和能耗成本，建议实际工程应用中可将雾化液滴直径控制在60 μm。所得研究结果可供雾化喷射装置设计、烟道蒸发系统运行优化参考。

Numerical Simulation of Desulfurization Wastewater Treatment with in-Depth Filtration-Flue Evaporation Process

The atomizing nozzle of the desulfurization wastewater treatment system tends to be blocked by the suspended solids in the water. Therefore, the correlative filtration process is proposed as a pretreatment process, in which the water is thoroughly separated before evaporation. After the filtration, the mass concentration of the suspended solids in the wastewater can be decreased to 40 mg/L with over 99% of the remaining particles smaller than 1 μm. Moreover, the theoretical calculation as well as digital simulation using the Fluent software package is conducted to study the evaporation process. The results show that higher flue gas temperature and smaller liquid drop diameter yield shorter evaporation time. By taking in account of the liquid drop evaporation effects and the energy consumption, it is recommended to make the diameter of the liquid drops under 60 μm in engineering applications. The study results can provide some guidance for the atomizing nozzle system design, as well as the optimization of the treatment process.