对广东某600 MW燃煤电厂脱硫废水干燥塔进行了数值建模，利用离散相模型（DPM）计算气液两相的传热传质，得到流场分布和液滴蒸发情况，并研究了盐质量分数、废水体积流量、进口烟温和液滴初始粒径对液滴蒸发的影响。研究发现：设计工况下塔内轴心处速度较高，形成回流区，液滴在塔内上方完全蒸发；随着进口烟温提高，蒸发时间逐渐减小，有利于液滴蒸发；增大废水体积流量后，液滴蒸发速率减慢，该干燥塔处理的废水体积流量可达6 m3/h；较大的液滴初始粒径不利于液滴蒸发，且易使其粘在内壁引起腐蚀，建议初始粒径不超过90 μm；脱硫废水含盐质量分数越高，蒸发速率越慢，蒸发时间越长。

A numerical model of desulfurization wastewater drying tower in a 600 MW coalfired power plant in Guang dong was established. The heat and mass transfer of gasliquid twophase was calculated by using the DPM model. The flow field distribution and droplet evaporation were obtained. The effects of salt mass fraction, wastewater volume flow, inlet smoke temperature and initial droplet size on droplet evaporation were studied. The study shows that under the design conditions, the speed in the center of the tower is high, forming a reflux zone, and the droplets are completely evaporated above the tower; with the increase of the inlet flue gas temperature, the evaporation time gradually decreases, which is conducive to droplet evaporation; increasing the wastewater volume flow, the droplet evaporation rate slows down, and the volume flow of wastewater treated by this drying tower can reach 6 m3/h; the droplets with larger initial particle sizes are not conducive to evaporation, and easy to stick to the inner wall to cause corrosion, so the initial particle size not exceeding 90 μm is suggested; the higher the salt mass fraction of desulfurization wastewater is, the slower the evaporation rate and the longer the evaporation time will be.

TK16

高耗水企业废水资源化及零排放关键技术研究与集成应用（GDKJXM20183546）