Simultaneous removal of SO2 and NO using M/NaClO2 complex absorbent☆

Integrative process of preoxidation and absorption for simultaneous removal of SO2, NO and Hg0

“…Also, the obtained results were similar to those of previous studies, e.g. Zhao et al [15] who found that a pH of 5.5 was suitable for NaClO/NaClO 2 oxidizing NO in a bubble reactor. Wei et al [28] revealed that when the initial pH value of the NaClO 2 /CO(NH 2 ) 2 solution changed from 7.05 to 10.51, NO removal efficiency remained approximately 97.3% in a wet scrubber.…”

“…Therefore, the methods for simultaneous removal of SO 2 , NO and Hg 0 have been extensively researched in recent years. Many reagents such as Fe(II)-EDTA [10], Co(NH 3 ) 6 3+ [11], KMnO 4 [12], CO(NH 2 ) 2 [13], K 2 FeO 4 [14], NaClO 2 [15] and H 2 O 2 [16,17] etc., have been used to simultaneously remove SO 2 , NO and Hg 0 . Nevertheless, most of these cannot be developed for industrial use due to the technical and economic problems.…”

Simultaneous removal of SO2, NO and Hg0 by wet scrubbing using urea + KMnO4 solution

“…For mercury control, activated carbon injection upstream of the ESP or FF is considered as the most promised as a mercury control technology [8,9], whereas, the rather high cost of the sorbent, activated carbon's poor utilization/selectivity for mercury have made this technology less attractive for industrial use in China [10,11]. Since the single-pollutant control technologies result in expensive investment and operating cost, researchers focused on developing new technology for simultaneous removal of NO, SO 2 and mercury from flue gas, including ozone injection [5], pulsed corona discharge, [6] absorption process [12][13][14] etc. Now, multi-pollutant gas cleaning systems are considered a valuable option in terms of efficiency and low investment, and the wet flue gas desulfurization (WFGD) units are considered an optimized method for the co-capture of pollutants [15].…”

“…So, most of the researchers have focused on the oxidation technology, and wish to efficiently remove Hg 0 , SO 2 and NO simultaneously in the WFGD. The most commonly used oxidants include K 2 S 2 O 8 [17], KMnO 4 [18,19], Fenton's reagent [20,21], NaClO 2 [12,22], O 3 [5], H 2 O 2 [23,24], ClO 2 [25] and so on.…”

Emission characteristics of Cl2 and ClO2 during simultaneous removal of SO2 and NO using NaClO2 solution

“…For example, Huson et al [12] carried out an experiment of simultaneous removal of SO 2 , NOx and Hg from coal flue gas by using a NaClO 2 -enhanced wet scrubbing method, from which, a NaClO 2 began to be used as an additive of simultaneous removal of multi-pollutant of fuel gas was proposed. In the research of Zhao et al [13] , NaClO+NaClO 2 oxidant was used to investigated simultaneous removal of SO 2 and NO from fuel gas, under the optimal conditions, the removal efficiency of SO 2 and NO reached 100% and 85% respectively. In NaClO 2 [14] .…”