Comparison of control techniques for reduction of acid gases and NO_x - (ppt)

摘要

Conclusions NO_x scrubber technology · Both ozone and chlorine dioxide are selective and efficient oxidants · O_3 technology better for power plants due to the lack of a CIO_2 at site · CIO_2 better for pulp mills - available on site; used in bleaching · O_3 and CIO_2 technology is the only efficient NO_x control for RB and Lime kilns · When using one of these oxidants, the reaction of NO to NO_2/N_2O_5 in milliseconds · Oxidized NO_2/N_2O_5 will easily dissolve in scrubber liquor · Scrubber liquor will be neutralized with NaOH · Easy start-up of CIO_2 or O_3 based NO_x scrubber. Reliable technology. · The first CIO_2 based NO_x scrubber in the world in recovery boiler operation start-up in 2017. Two more scrubbers started up in 2018 and 2019. All in China. · Five more scrubbers under construction in China. One with O_3 oxidizer, four with CIO_2.