A novel method for removing NOx from simulated marine exhaust gas in wet absorption system using Na2SO3/THS composite solution. Issue 2 (19th September 2022)

• Record Type: Journal Article
• Authors: Liu, Gang; Han, Zhitao; Li, Jiawei; Wang, Zhen; Cheng, Shaosi; Liu, Yubin; Yu, Jing; Pan, Xinxiang
• Is Part Of: Environmental progress & sustainable energy. Volume 42:Issue 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-19
• Subjects: marine exhaust gas -- Na2SO3 -- nitrate -- NOx absorption -- THS; Environmental engineering -- Periodicals; Sustainable engineering -- Periodicals; Environmental chemistry -- Periodicals; 333.7
• DOI: 10.1002/ep.13998
• Languages: English
• ISSNs: 1944-7442

Abstract

Abstract: Since it is difficult to deal with high‐concentration nitrates in scrubbed wastewater onboard vessels, the application of traditional wet denitration technology is limited to some extent. Here a novel method for removing pre‐oxidized NO x by using Na2 SO3 /THS composite solution is proposed with the aim to obtain high NO x absorption efficiency and low nitrate concentration in scrubbed wastewater simultaneously. The effects of Na2 SO3 concentration, THS concentration, NO x oxidation degree, coexistence of SO2 and O2 in flue gas, initial pH value and temperature of absorption solution on denitration performance were discussed in detail. The results showed Na2 SO3 could reduce NO x to nitrate, nitrite, and N2 . The addition of THS could promote NO x absorption greatly by forming complexes with SO3 2− . When initial NO x concentration was 1000 ppm with a NO x oxidation degree of 50%, O2 concentration was 8%, Na2 SO3 and THS concentrations were 25 and 20 mmol/L, a NO x absorption efficiency of 87% could be achieved, while nitrate and nitrite concentrations were 32.97 and 14.19 mg/L, respectively.