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首页> 外文期刊>Fuel >Simultaneous removal of SO_2 and NOx from flue gas using (NH_4)_2S_2O_3/steel slag slurry combined with ozone oxidation
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Simultaneous removal of SO_2 and NOx from flue gas using (NH_4)_2S_2O_3/steel slag slurry combined with ozone oxidation

机译：（NH_4）_2S_2O_3 /钢渣浆与臭氧氧化同时去除烟道气中的SO_2和NOx

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摘要

The use of thiosulfate salt (S2O32-), a low-cost reductant, as an absorbent for NO2 removal has been rarely reported. In this study, we propose a method that combines ozone oxidation and (NH4)(2)S2O3/steel slag slurry spraying to simultaneously remove sulfur dioxide (SO2) and nitrogen oxides (NOx) from flue gas. We investigated the effects of operation conditions on the simultaneous removal efficiencies of SO2 and NOx. Results showed that SO2 removal efficiency was affected by pH, whereas NOx removal efficiency was mostly influenced by (NH4)(2)S2O3 concentration, reaction temperature, and pH level. Under optimal operation conditions, removal efficiencies of almost 100% for SO2 and above 78.0% for NOx were achieved. NH4+ in the steel slag slurry could tolerate high NO2- concentrations (up to 3.00 mol/L), and the co-existence of NH4+ and S2O32- had a significant synergistic effect on NOx removal. Together with S2O32-, Mg2+ that leached from the steel slag also had a synergistic effect on NO2 removal. We established the reaction mechanisms for NOx removal using (NH4)(2)S2O3/steel slag slurry. In this process, S2O32- acted as a reducing agent and an oxidation inhibitor of SO32-, thereby enhancing NO2 removal. Moreover, NH4+ inhibited the denitration product (NO2-) from decomposing into NO and NO2, thereby accelerating NOx removal.
机译：几乎没有报道使用低成本的还原剂硫代硫酸盐（S2O32-）作为吸收NO2的吸收剂。在这项研究中，我们提出了一种结合臭氧氧化和（NH4）（2）S2O3 /钢渣泥浆喷雾的方法，同时从烟道气中去除二氧化硫（SO2）和氮氧化物（NOx）。我们研究了操作条件对同时去除SO2和NOx效率的影响。结果表明，SO2去除效率受pH值的影响，而NOx去除效率主要受（NH4）（2）S2O3浓度，反应温度和pH值的影响。在最佳操作条件下，SO2的去除效率达到近100％，NOx的去除效率达到78.0％以上。钢渣浆中的NH4 +可以耐受较高的NO2-浓度（最高3.00 mol / L），并且NH4 +和S2O32-的共存对NOx的去除具有显着的协同作用。与从钢渣中浸出的S2O32-，Mg2 +一起也对NO2的去除具有协同作用。我们建立了使用（NH4）（2）S2O3 /钢渣浆去除NOx的反应机理。在此过程中，S2O32-充当SO32-的还原剂和氧化抑制剂，从而提高了NO2的去除率。此外，NH4 +抑制了脱硝产物（NO2-）分解为NO和NO2，从而加速了NOx的去除。

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  • 来源
    《Fuel》 |2019年第1期|115760.1-115760.8|共8页
  • 作者

    Meng Ziheng; Wang Chenye; Wang Xingrui; Chen Yan; Wu Wenfen; Li Huiquan;

  • 作者单位

    Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Simultaneous removal; SO2; NOx; (NH4)(2)S2O3; Steel slag; Reaction mechanism;

    机译：同时去除;SO2;NOx;（NH4）（2）S2O3;钢渣;反应机制;

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