College of Resource and Environment Engineering, Liaoning Technical University, Fuxin 123000, China; 2.College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China
The chemical reaction in the process of fluoride removal with limestonegypsum from flue gas was described. Based on the twofilm theory, the kinetic model of CaCO3HF reaction was established and analyzed. The effects of reaction temperature, reaction time, HF vaporphase pressure and ratio of Ca/F molar ratio on the fluoride removal reaction were explored. The results show that the conversion of a CaCO3 particle and the fluoride removal efficiency increase as the reaction temperature, the reaction time and HF vaporphase pressure are raised. The molar ratio of Ca/F molar ratio significantly affects the fluoride removal efficiency. It is suggested that twofilm theory model can be used to describe the dynamical behavior of fluoride removal reaction with wet limestone/gypsum. The investigation results are of important significance for studying the mechanisms of gaseous fluoride removal by the typical wet FGD techniques and developing the uniform control technology of coalfired pollutants.