Authors: Xiandong Liu a, Man Zhang a, Runxia Cai a, Xuan Yao a, Junfu Lyu a and Hairui Yang a
a Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Source: This paper was published in the 13th International Conference on Fluidized Bed Technology in 2021.
Abstract: The limestone/gypsum flue gas desulfurization (FGD) as a high SO2 removing efficiency desulfurization technology attracts much interests, while the wastewater produced in desulfurization process is a severe problem to solve. Traditional method using chemical precipitation, ion exchange, activated carbon adsorption cannot fulfill the zero-emission regulation on wastewater in China. Bypass evaporation tower zero-liquid discharge (ZLD) technology has been developing rapidly because of its simple pretreatment, high reliability and low operation and equipment cost. In this paper, a novel desulfurization wastewater dryer using Wurster fluidized bed was put forward. Numerical simulation based on Computational Particle Fluid Dynamics (CPFD) was applied to verify its flow state and wastewater evaporation efficiency. The results indicates that Wurster fluidized bed flow state can be approached through reasonable structure with cone section in the bottom and appropriate aeration strategy. Meanwhile, compared with the amount of wastewater vapor, the mass of droplet leakage is little, which indicates great evaporation efficiency. With simulation results, a design for industrial desulfurization wastewater dryer was put forward.