【摘要】 HCl是烟气中均相氧化Hg⁰的主要成分,但其氧化作用受到炉内其他气化产物的影响,其中以SO₂、NO和CO这3种气体的影响效果较为显著。通过固定床实验系统研究了SO₂、NO和CO对炉内HCl均相氧化Hg⁰的影响。由结果可知:SO₂和NO均促进了HCl对Hg⁰的氧化,CO则抑制了HCl对Hg⁰的氧化。基于实验结果,使用热力学软件Factsage 5.2确定了Hg⁰+HCl、Hg⁰+HCl+SO₂、Hg⁰+HCl+NO和Hg⁰+HCl+CO这4种系统中总计123个基元反应。Hg⁰+HCl+NO和Hg⁰+HCl+CO系统中Hg⁰向HgCl₂氧化的3条路径总结如下:（Ⅰ）Hg⁰被直接氧化成HgCl₂;（Ⅱ）Hg⁰被氧化成HgCl, HgCl被氧化成HgCl₂;（Ⅲ）Hg⁰被氧化成HgO,HgO转化成HgCl₂。除（Ⅰ—Ⅲ）外,Hg⁰+HCl+SO₂系统中增加了路径（Ⅳ）,Hg⁰先反应生成HgS,HgS转化成HgCl₂。SO₂促进作用归因于路径（Ⅰ）,NO促进作用归因于路径（Ⅰ）和（Ⅱ）,CO抑制作用归因于路径（Ⅲ）。更多还原

【Abstract】 HCl is the main component for the homogeneous oxidation of Hg⁰ in flue gas, but its oxidation is affected by other gasification products in the furnace, among which the effect of SO₂, NO and CO is more significant. The effect of SO₂, NO and CO on the homogeneous oxidation of Hg⁰ by HCl in furnace was studied by a fixed-bed experimental system. The experimental results show that both SO₂ and NO promote the homogeneous oxidation of Hg⁰ by HCl, while CO inhibites the homogeneous oxidation of Hg⁰ by HCl. Based on the experimental results, the thermodynamic software Factsage 5.2 was used to confirm a total of 123 elemental reactions in the four systems of Hg⁰+HCl, Hg⁰+HCl+SO₂, Hg⁰+HCl+NO and Hg⁰+HCl+CO. Three pathways for the oxidation of Hg⁰ to HgCl₂ in Hg⁰+HCl+NO and Hg⁰+HCl+CO systems were summarized as below:（Ⅰ）Hg⁰ was directly oxidized to HgCl₂;（Ⅱ） Hg⁰ was oxidized to HgCl, then HgCl was further oxidized to HgCl₂;（Ⅲ）Hg⁰ was oxidized to HgO, then HgO was converted to HgCl₂. Besides（Ⅰ-Ⅲ）, the pathway of（Ⅳ） was added in Hg⁰+HCl+SO₂ system, Hg⁰ was converted to HgS, then HgS was converted to HgCl₂. The promotion of SO₂ is attributed to pathway of（Ⅰ）, the contribution of NO is resulted from pathway of（Ⅰ） and（Ⅱ）, and the inhibition of CO is ascribed to pathway of（Ⅲ）.更多还原