文献类型：期刊文献

英文题名：Exploring the synergistic effect of NaOH/NaClO absorbent in a novel wet FGD scrubber to control SOx/NOx emissions

作者：Rizwan, Muhammad[1];Ali, Muhammad Faryad[1];Nawaz, Muhammad Asif[2];He, Mu[1];Song, Yueqin[1];Jiang, Peng[1];Ullah, Saif[1];Hassan, Malik M. Abdullah[1];Zhou, Xiaolong[1]

机构：[1]East China Univ Sci & Technol, Int Joint Res Ctr Green Energy & Chem Ind, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Seville, Inst Seville, Dept Inorgan Chem & Mat Sci, CSIC, Seville 41092, Spain

年份：2025

卷号：197

期号：2

外文期刊名：ENVIRONMENTAL MONITORING AND ASSESSMENT

收录：;EI(收录号：20250717882396);WOS:【SCI-EXPANDED(收录号:WOS:001397893000002)】；

语种：英文

外文关键词：Air pollution control; Industrial flue gas treatment; GHG emissions; SOx/NOx emissions control; Wet FGD scrubber; Chemical absorption; Emissions removal characteristics; Alkaline scrubbing solution

摘要：Escalating SOx and NOx emissions from industrial plants necessitates customized scrubbing solutions to improve removal efficiency and tackle cost limitations in existing wet FGD units. This work investigates the real-time intensified removal pathways via an innovative two-stage countercurrent spray tower configuration strategically integrating NaOH (Ma) and NaOH/NaClO (Ma/Mb) to remove SOx and NOx emissions simultaneously from the industrial stack through a comprehensive parametric study of absorbents concentration, reaction temperature, gas flow rate, liquid to gas ratio (FL/FG), and absorbent showering head. Flue gas stream comprising SO2 bearing 4500 ppm, SO3 bearing 300 ppm, 70 ppm NO, and 50 ppm NO2 brought into contact with two scrubbing solutions as Ma, and a complex absorbent of Ma/Mb at varying respective ratios. Ninety-two percent SOx emissions were removed using 5% NaOH with double-stage scrubbing, while NOx removal was observed below 50%. Adding NaClO facilitates additional "free radical (ClO-)" chemical pathways for gases to react and decompose into ionic forms for easier solubilization so as to significantly enhance the removal capacities for both SOx and NOx compounds. NaClO oxidizer, along with NaOH, boosted the respective removal efficiencies of SOx to 99.6% and 92% NOx, proving complementary media integration advantages arising from staged exposure and bubbly interphase mass transfer phenomena. The customized synergistic effect of Ma and Mb promoted the development of an additional free radical oxidation route while sustaining the solubilization of SOx/NOx in caustic, driving toward fractional detoxification. A dimensionless emission performance model was developed along with mechanism validation through DFT in context to the successful formation of residual salts by applying the DMol3 tool in Materials Studio by exploring the convergence analysis, geometry optimization, and COSMO sigma profile.