Removal of nitric oxide in rotating packed bed by ferrous chelate solution

As a major pollutant flue gas, nitric oxide (NO) emission has received great attention of the world. Various technologies have been developed to reduce NO emission. Among them, wet scrubbing approach seems to be promising concept. Ferrous chelate solution has been demonstrated as a suitable and efficient option in flue gas denitrification process due to its high reaction rate with NO and good regeneration ability. However, NO absorption rate is strongly affected by mass transfer limitation of NO and FeII(EDTA) solution in traditional reactors. In this study, RPB is firstly introduced as a gas–liquid reactor to enhance the NO removal efficiency by FeII(EDTA) solution. Preliminary experimental results are presented on the absorption of NO by investigating the effects of operating parameters on NO removal efficiency in RPB. The removal efficiency peaks when the pH value of the absorbent reaches 7. The optimum temperature for this gas–liquid absorption system is in the range of 293–303 K. When the gravity level of the RPB is higher than 150 g, the removal efficiency could reach 87%. In addition, the NO removal efficiency decreases with the increase of the gas–liquid ratio. The simultaneous increase of the gas and the liquid flow rates has no obvious effect on the removal efficiency. The obtained results imply a great potential of RPB in the removal of NO from flue gases.

► RPB reactor was firstly introduced to enhance the NO removal by ferrous solution.
► The NO removal efficiency was obviously enhanced under high-gravity environment.
► Optimizations of the operating conditions were provided in this study.
► The obtained results showed a great potential of RPB for NO removal.