Abstract
In this study, NaClO2 was used as an oxidant and mixed with NaOH to prepare a sodium-based composite absorbent. Simultaneous desulfurization and denitrification experiments were conducted in an ultrasonic atomization reactor and the effects of experimental parameters including pH value, NaClO2 concentration, initial concentration of NO, reaction temperature, the addition of SO2 and the utilization of ultrasonic atomization on desulfurization and denitrification efficiencies were investigated. Under the circumstance of the pH of 10, oxygen content of 8%, reaction temperature of 55oC, and NO concentration of 500 mg/m3, SO2 concentration of 1400 mg/m3, 69.38% of NO and 99.95% of SO2 can be removed using the composite absorbent composed of 0.02 mol/L NaClO2 and 0.1mmol/L NaOH. Ultrasonic atomization increased the denitrification rate by 10.6%.
Highlights
The main atmospheric pollutants produced by coal combustion are SO2 and NO2, which are responsible for acid rain and haze formation
NO is difficult to be removed; it can only be removed with an alkaline absorbent in the NO2 form
The NaClO2 oxidant was used in the alkaline desulfurization and denitrification system
Summary
The main atmospheric pollutants produced by coal combustion are SO2 and NO2, which are responsible for acid rain and haze formation. To achieve simultaneous wet flue gas desulfurization and denitrification, a new absorber that can oxidize and absorb NO at low temperatures is needed. Sodium chlorite solution has been widely studied as an absorbent for flue gas desulfurization and denitrification. It has the advantages of high removal efficiency, simultaneous oxidation and absorption, no scaling, and low investment cost in the simultaneous desulfurization and denitrification of the liquid phase. NaClO2/NaOH composite absorbent was adopted to conduct simultaneous desulfurization and denitrification experiments in an ultrasonic atomization reactor. The main parameters of the experiment including initial pH, NaClO2 and NO2 concentrations, reaction temperature, and the effect of SO2 on denitrification efficiency were investigated. The equations for calculating the removal rate of SO2 and NOx are as follows: ηη
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