The Reaction Characteristics And Mechanisms Of Simultaneous Removal Of SO₂and NOx By MgO/Additives Solution

The new air pollutant emission standard of thermal power plant has been im-plemented. It has put forward more strict requirements on the controlling of the ther-malpower plants’ SO2and NOx emission.In order to satisfy these requirements, moreeffective desulfurization denitration technologies should be developed and po-pularized.The desulfurization technology pecially wet desulphurization has been extensivelyapplied in thermal power plant, and developing simultaneous desulfuri-zation denitrationtechnology under this basis can not only meet the emission limit but also save cost aswell as the cover area.Magnesium desulfurization technology has a lot of characteristic s, for exam-ple,desulphurization agent accessible, efficiency stability, small square, simple process, noteasy to scale, low cost of investment and operation. But as a result of about90%NOx isNO which is difficult soluble in water, make it difficult to simul-taneous desulfurizationdenitration. In this research, we mainly use bubble reactor to complete MgO/additivereaction of simultaneous desulfurization and denitration, and filtered out additives withthe features of low cost of preparation, operational safety, economy and high efficiency.Based on the reaction of MgO, we have carried out an experiment to find out the factorsthat can influence the MgO/additive reaction of simultaneous desulfurization anddenitrification. After experimenting on variables of the initial concentration ofNaClO2,reaction temperature, absorption solution pH, concentration of O2,concentrationof CO2,the initial concentration of NO and SO2separately, finally we got the influencesand regular patterns of these factors and the best reaction condition for reaction. Based onthe experimental results and product analysis,We also analyzed the reaction mechanismof this technology, and derived the general equation of chemical reaction. With the use ofchemical thermodynamic principle, we calculated and analyzed the standard Gibbs function, standard equili-brium constant and the gas pressure of the above reactions, andassessed the direction, feasibility and limits of the reaction. The results showed that thereaction was thermo dynamically feasible and the extent was very deep. Beyond that, thisstudy also used TQ Analyst and Omnic software established quantitative model for theexperiment system, Implementation on line Monitoring of the SO2,NO and NO2useFourier Transform Infrared.In conclusion, this research laid a solid theoretical foundationfor new coal-fired flue gas desulfurization denitration technology development andindustrial application.