Simultaneous desulfurization and denitrification with hypochlorite oxidant
Comparative experiments on the simultaneous removal of NO and SO2 from simulated smelting flue gas were carried out using two hypochlorite salts of NaClO and Ca(ClO)2,respectively,in a tandem bubbling reactor.The effects of operation parameters such as the oxidizing agent concentration,the number of reactors,the reaction temperature,and the pH of the solution on the removal efficiency were investigated.The results showed that,when the hypochlorite oxidant was used,the removal of SO2 was always good and the removal efficiency of NO increased with the increase of the oxidant concentration and reactor number.With the increase of reaction temperature and solution pH,the removal of NO by hypochlorite oxidant gradually weakened.Comparison results showed that Ca(ClO)2 has better desulfurization and denitrification efficiency than NaClO.Under the optimal reaction conditions,the best simultaneous desulfurization and denitrification efficiencies of 95.4%and 88%,respectively,were obtained with a Ca(ClO)2 concentration of 25mmol/L,three reactors in series,reaction temperature of 25℃,and pH=6.In addition,the reaction mechanism of simultaneous desulfurization and denitrification by hypochlorite absorber was also proposed,in which NO was converted into NO2-and NO3-by contact reaction with hypochlorite oxidizer,and SO2 was oxidized into SO42-,and CaSO4 precipitation would be generated in the case of Ca(ClO)2,so that NO and SO2 could be removed in the process.
sodium hypochloritecalcium hypochloritedesulfurization and denitrificationsmelting flue gasbubble column reactor
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