某660 MW机组脱硫废水烟道蒸发系统设计及运行效果分析

脱硫废水因含盐量高且成分复杂，成为燃煤电厂废水“零排放”的难题，采用烟道蒸发方式予以处理是解决途径之一。在数学建模和Fluent模拟分析的基础上，对雾化粒径为50 μm和60 μm时脱硫废水的蒸发情况进行研究，结果为130 ℃烟气温度下这2种粒径的脱硫废水蒸发时间分别为0.78 s和0.85 s，所消耗的压缩空气量（标准状态）分别为60 m³/min和26 m³/min。以某660 MW燃煤机组为研究对象，根据烟道内流场特点对该机组脱硫废水烟道雾化蒸发系统的设计进行优化。脱硫废水雾化蒸发系统安装运行后，对系统运行数据进行了研究分析。实践结果表明，脱硫废水烟道雾化蒸发系统的运行对脱硫系统、除尘器系统的正常运行没有明显影响，粉煤灰品质的少许变化不影响粉煤灰的品质和资源化利用。

System Design and Operation Analysis of the Desulfurization Wastewater Treatment with Flue Evaporation Process for a 660 MW Unit

Due to the high salinity and complex components, the treatment of the flue gas desulfurization wastewater is always a challenge to meet the "zero discharge" standard. Based on the mathematical model and Fluent simulation, the evaporation process of the flue gas desulfurization wastewater with droplet diameters at 50 μm and 60 μm are studied. The two sizes of wastewater droplets are vaporized in 0.78 s and 0.85 s at 130℃, and the compressed air consumptions are 60 m³/min and 26 m³/min, respectively. Moreover, the characteristics of the flue flow field in a 660 MW unit are also considered in the optimization of the wastewater evaporation system design. The operation data of the wastewater evaporation system are collected and analyzed for the further system optimization. Experimental results show that the evaporation of the desulfurization wastewater in the flue does not affect the flue gas desulfurization system and the electrostatic precipitator, and the variation of the fly ash is still within the resource utilization limit.