Numerical simulation study on spray evaporation of desulfurization wastewater in flue duct
ZHENG Hao, ZHENG Cheng-hang, YANG Zheng-da, LI Xiang, WENG Wei-guo, ZHOU Can, GAO Xiang
State Key Laboratory of Clean Energy Utilization, National Environmental Protection Coal-fired Air Pollution Control Engineering Technology Center, Zhejiang University, Hangzhou 310027, China
In this paper, the effect of flue gas properties and operating parameters on the evaporation process of wastewater was studied by using Computational Fluid Dynamics (CFD). The results showed that with the increase of the temperature of the flue gas, the evaporation time of the droplets gradually decreased, and the complete evaporation distance decreased.When the flow rate of flue gas increased, the evaporation time gradually decreased, but the total evaporation distance decreased first and then increased. At the flow rate of 5m/s, wastewater droplets got to the shortest evaporation distance. With the increase of the droplet size, the complete evaporation time of the droplet became significantly longer, and the range of the relatively low temperature region within the flow field was enlarged; When the evaporation time increased from about 0.21s to 0.16s when the injection speed increased from 20m/s to 60m/s, but with the increase of flow rate, the effect of reducing evaporation time was weakened;. The simulation results can provide optimized design solutions and operational guidance for the related engineering applications of spray evaporation of desulfurization wastewater in flue duct.
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