Abstract
Most power plants equipped with limestone-gypsum wet flue gas desulphurization (FGD) system treat FGD wastewater by chemical precipitation which is not able to remove chloride ion completely. The wastewater treatment of concentrating and crystallizing piecewise by flue gas can solve this issue. Pretreating wastewater by undersaturated fuel gas and then concentrating by high temperature fuel gas is not only utilizing waste heat but also realizing “zero discharge”. By 3D-modeling of concentration tower and numerical simulation of evaporation, the evaporation process of wastewater droplet in concentration tower has been studied. Through simulation, the impact of four main factors (gas mass flow, initial droplet diameter, gas temperature and droplet temperature) to evaporation efficiency (EE) has been analyzed. Result indicates that the decrease of initial droplet diameter has greatest impact on improvement of evaporation. Furthermore, raise gas mass flow, gas temperature and droplet temperature in reasonable range can improve EE effectively. The conclusion provides reliable theoretical basis for technological design of concentration tower in power plants.
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