Simultaneous oxidation removal of NO and SO2 in simulated flue gas stream via a UV-light/composite oxidant system

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-03-04 DOI:10.1016/j.psep.2025.106971

Yan Wang , Zihan Xiao , Xinyu Gao , Yangxian Liu

{"title":"Simultaneous oxidation removal of NO and SO2 in simulated flue gas stream via a UV-light/composite oxidant system","authors":"Yan Wang , Zihan Xiao , Xinyu Gao , Yangxian Liu","doi":"10.1016/j.psep.2025.106971","DOIUrl":null,"url":null,"abstract":"<div><div>In this work, an ultraviolet light (UV-light)/composite oxidant oxidation system based on an impinging stream absorber has been constructed, and then used for synchronously removing NO and SO2 in simulated flue gas. The influences of process variables on NO/SO2 oxidation processes, removal mechanisms, enhancement mechanisms, and macro-kinetics were studied. This system constructed can realize superior simultaneous desulfurization and denitrification efficiency owing to the synergistic effects of composite oxidant under far lower reagent and smaller energy consumption. The simultaneous removal efficiency of 98.9 % for NO and 100 % for SO2 was achieved in the UV-light/composite oxidant oxidation system, far exceeding the systems induced via a single oxidant. The concentrations of H2O2 and S2O82-, operation temperature, and solution pH value have a dual influence on the NO removal efficiency, and the optimized values are 0.1 mol/L, 0.1 mol/L, 60℃ and 2.48, respectively. The utilization rate of free radicals in liquid phase is greatly improved owing to the interaction between the two oxidants, which is attributed to the crucial role of H2O2 as a free radical capture intermediate in this system. For the NO removal, oxidation via hydroxyl radical played the most key role and oxidation via sulfate free radical played a second key role. Oxidation by peroxides played a significant role in SO2 removal. The NO absorption process in the UV-light/composite oxidant oxidation system was determined to be a pseudo-first-order rapid reaction kinetic characteristic.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"197 ","pages":"Article 106971"},"PeriodicalIF":6.9000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Process Safety and Environmental Protection","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0957582025002381","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

In this work, an ultraviolet light (UV-light)/composite oxidant oxidation system based on an impinging stream absorber has been constructed, and then used for synchronously removing NO and SO₂ in simulated flue gas. The influences of process variables on NO/SO₂ oxidation processes, removal mechanisms, enhancement mechanisms, and macro-kinetics were studied. This system constructed can realize superior simultaneous desulfurization and denitrification efficiency owing to the synergistic effects of composite oxidant under far lower reagent and smaller energy consumption. The simultaneous removal efficiency of 98.9 % for NO and 100 % for SO₂ was achieved in the UV-light/composite oxidant oxidation system, far exceeding the systems induced via a single oxidant. The concentrations of H₂O₂ and S₂O₈^2-, operation temperature, and solution pH value have a dual influence on the NO removal efficiency, and the optimized values are 0.1 mol/L, 0.1 mol/L, 60℃ and 2.48, respectively. The utilization rate of free radicals in liquid phase is greatly improved owing to the interaction between the two oxidants, which is attributed to the crucial role of H₂O₂ as a free radical capture intermediate in this system. For the NO removal, oxidation via hydroxyl radical played the most key role and oxidation via sulfate free radical played a second key role. Oxidation by peroxides played a significant role in SO₂ removal. The NO absorption process in the UV-light/composite oxidant oxidation system was determined to be a pseudo-first-order rapid reaction kinetic characteristic.

查看原文本刊更多论文

本研究构建了一个基于撞击流吸收器的紫外光（UV-light）/复合氧化剂氧化系统，并将其用于同步去除模拟烟气中的 NO 和 SO2。研究了工艺变量对 NO/SO2 氧化过程、去除机制、增强机制和宏观动力学的影响。由于复合氧化剂的协同作用，所构建的系统能在更低的试剂和更小的能耗下实现更高的同步脱硫和脱硝效率。紫外光/复合氧化剂氧化系统对 NO 和 SO2 的同时去除率分别达到 98.9% 和 100%，远远超过了通过单一氧化剂诱导的系统。H2O2 和 S2O82- 的浓度、操作温度和溶液 pH 值对 NO 的去除率有双重影响，优化值分别为 0.1 mol/L、0.1 mol/L、60℃ 和 2.48。由于两种氧化剂之间的相互作用，液相中自由基的利用率大大提高，这归因于 H2O2 在该体系中作为自由基捕获中间体的关键作用。在去除 NO 的过程中，羟基自由基的氧化作用最为关键，硫酸自由基的氧化作用次之。过氧化物的氧化作用对二氧化硫的去除起着重要作用。紫外光/复合氧化剂氧化系统中的 NO 吸收过程被确定为假一阶快速反应动力学特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.