Study On Absorption Of No And So₂ In Iron(Ⅱ)Solutions

With the elevation of national criteria on pollutant discharge, the technique of combined removal on pollutant has ranked as concentration of current research. It is of great value and importance to researching on the combined wet method because this approach of desulfurization is mature and widely adopted. This article illustrates a combined means on both catalytic oxidizing sulfur dioxide with Fe^â…¡solvent and nitric oxide complex absorption. Due to the comparative maturity of wet desulfurization and masses of work done by former researchers on sulfur dioxide catalytic oxidation, this article mainly focuses on the complex absorption of nitric oxide through Fe^â…¡solutions under the basis of wet desulfurization. This writing looks into the kinetic parameters in the complex absorption reaction, thus provides theoretical evidence for the feasibility of this technique; researching on the effect of relevant operational parameters on nitric oxide complex absorption in the falling-film absorption tower will direct the industrious implementation technically.First, the double stirred reaction system with gas-liquid interface are constructed in order to research into the kinetic of complex absorption. The results show that FeSO₄ solution is not rather effective in this complex absorption, which is not feasible as solvent in large-scale industrious implementation; Fe^â…¡EDTA solution is comparatively competent as solvent in wet gas denitrification; Fe^â…¡EDTA solutions has the optimized complex absorption efficiency under the pH value of 7 and temperature of 50℃respectively; the increase of inlet oxygen content will result in that part of Fe^â…¡be oxidized into Fe^â…¡I, which is not capable of complex absorption and leads to drawback on absorption rate; sulfur dioxide takes a competitive relationship with nitric oxide in reacting with Fe^â…¡EDTA solution initially, and with the increase of sulfur dioxide afterward, the nitric oxide reacts with Fe^â…¡(SO₃)EDTA to promote the absorption of nitric oxide.In order to detect the operational features of novel wet absorption apparatus with parallel flow falling film, optimizing the system and its operational conditions, this writing takes experimental researches on the effects of various operational parameters inside the tower on the denitrification process under the simulation of actual operating condition. Experimental results of liquid phase operational parameters'effects demonstrate that the system's optimal liquid-gas ratio under the experimental condition is 8L/m³; the reasonable pH value of FeIIEDTA solution is around 7. Experimental results of gaseous phase operational parameters'effects demonstrate that the increase in flow velocity may enhance mass transformation and it is possible to achieve high flow velocity inside the tower under experimental conditions; the absorption rate of nitric oxide will not be affected drastically when its gaseous phase concentration fluctuates between 200⁶00ppm; the absorbing rate of nitric oxide drops gradually with the increase of inlet oxygen content; in case that there is sulfur dioxide existing from inlet, the absorbing rate of nitric oxide will endure a decrease in the first hand and then increase steadily with the elevated sulfur dioxide concentration.