Abstract
ABSTRACTWet flue gas desulfurization (WFGD) wastewater treatments used by most coal-fired power plants have difficulty in realizing completely zero emission. An atomizing and crystallization treatment of desulfurization wastewater using high-temperature gas from SCR (selective catalytic reduction) denitrification reactors was proposed. Using ANSYS software, 3D modeling of a crystallization tower and a numerical simulation of evaporation were conducted, and the crystallization process of wastewater droplets was studied. Based on the results of the simulation, effects of four main factors on evaporation efficiency were analyzed. The results indicate that droplet group with the same initial diameter of 10 μm can evaporate entirely within a time of 0.6 s and a height of 2.4 m when the mass flow rate of 620 K flue gas increases to 2.1 kg/s. In a practical process, fluctuations in the temperature and humidity should be avoided to guarantee complete evaporation. The results provide data support for technology design of crystallization towers applied in power plants.
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