Macrokinetics Of Simultaneous Desulfurization And Denitrification Based On Magnesium Desulfurization

The combustion of coal released a large amount of pollutants such as sulfur dioxide（SO₂）and nitrogen oxides（NO_x）.It is the main cause of atmospheric environmental problems such as photochemical pollution,acid rain,ozone,and regional haze in winter.In recent years,the SO₂ and NO_x emissions from coal-fired power plants,the main sources of pollution,have been effectively controlled.Thus the worsening situation of atmospheric pollution has been effectively alleviated,but the current status of pollution remains severe.Mainly because other sources of pollution,especially the pollution from the small and medium-sized industrial boilers,which are considered as the second largest source of pollution in China,have not been effectively controlled.For this reason,in the previous research,the research group used NaClO₂ as an additive which is used in the simultaneous desulfurization and desulfurization of flue gas technology based on Mg O method.This way can provide a new and effective method for the simultaneous desulfurization and denitrification of small and medium industrial boilers.This paper is based on the study of the characteristics how the simultaneous desulfurization and denitrification of Mg O/NaClO₂ act.The macro-reaction kinetics research was carried out mainly through a double-stirred reactor.Mg O/NaClO₂ system,NaClO₂ system and Mg O/NaClO₂ classification system were studied.The effects of factors such as initial concentration of reactants,p H value of absorbent and reaction temperature on the reaction rate of desulfurization and denitrification were investigated.The reaction rate equation,the order of reaction,and the activation energy of the reaction were obtained through experiments.The dual-membrane theory was used to analyze the gas-liquid mass transfer mechanism and the reaction process.The results show that:in the mixed Mg O/NaClO₂ system,the reactions of NO,SO₂ and NaClO₂ are all pseudo-first-order reactions,the activation energy of the reactions are 43.515 k J/mol,13.326 k J/mol,12.826 k J/mol.In the sodium chlorite system,the reaction of NO and SO₂ is a pseudo-first-order one,the reaction order of NaClO₂ is 0.2659,and the corresponding activation energy is 10.803k J/mol,17.473 k J/mol,3.862 k J/mol;The system can improve economic efficiency;meanwhile,the desulfurization and denitration reactions are mainly controlled by the gas film.