Simultaneous wet desulfurization and denitration by an oxidant absorbent of NaClO 2 /CaO 2

• Published in: Environmental science and pollution research international Vol. 26; no. 28; p. 29032
• Main Authors: Wang, Zhiping, Lun, Liyong, Tan, Zhongchao, Zhang, Yanguo, Li, Qinghai
• Format: Journal Article
• Language: English
• Published: Germany 01-10-2019
• Subjects: Denitrification; Models, Chemical; Oxidants; Sulfur Dioxide - chemistry; Temperature; X-Ray Diffraction; Calcium peroxide (CaO2); Reaction mechanism; Sulfur oxide (SO2); Nitric oxide (NO); Sodium chlorite (NaClO2)
• ISSN: 1614-7499

The simultaneous wet removal performance of NO and SO
was studied using the oxidant absorbent NaClO
/CaO
. The factors were studied including NaClO
and CaO
concentrations, reaction temperature, and gaseous components, such as SO
, NO, O
, and CO
. The products in liquid and solid phases were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and ion chromatography to determine the mechanism of simultaneous desulfurization and denitration by NaClO
/CaO
. The results indicated that the removal efficiency of SO
was in the range of 98-99.9%, and the removal efficiencies of NO and NO
were 99.4% and 95.0%, respectively. The removal efficiencies of NO and NO
increased with the increase of NaClO
and CaO
concentration and reaction temperature. The gaseous components had a stronger effect on NO
removal efficiency, followed by NO removal efficiency, and SO
removal efficiency. As SO
concentration increased, the generation of sulfite species promoted the removal of NO and NO
. Competition for NO
and SO
absorption by absorbent inhibited the removal efficiencies of SO
and NO
. The presence of O
was beneficial for removing SO
, NO, and NO
, while the presence of CO
was not. The main products in the liquid and solid phases were NO
, NO
, SO
, and CaSO
. The reaction mechanism for simultaneous wet removal of SO
and NO by NaClO
/CaO
is proposed and discussed.