Reactive absorption of NO and SO2 into aqueous NaClO in a counter-current spray column

Abstract

The experiments were performed in a spray column to study the simultaneous absorption of NO and SO2 using NaClO solution from simulated gas stream under various experimental conditions. The effects of various influencing parameters, such as absorbent concentration, reaction temperature, initial SO2 and NO concentration, and initial pH of NaClO solution on simultaneous removal of SO2 and NO, were emphatically investigated in regard to coal-fired thermal power plant stack gas emission control. The maximum removal efficiencies of SO2 and NO were found as 97% and 87.8%, respectively, at 313 K, initial NaClO solution pH 5.4 and 0.024 M NaClO concentration. The addition of CO2 in simulated gas stream was also carried out to see its influence on removal efficiency of SO2 and NO. The results using a spray column showed that NaClO can be used effectively for simultaneous removal of NO and SO2from coal-fired thermal power plant simulated gas stream. © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.