【摘要】 在100℃的无水蒸气条件下研究以Ca（OH）₂为吸收剂同时脱硫脱硝过程中SO₂的固定和氧化过程,以及O₂和NO₂的作用。分别用原位漫反射傅里叶红外光谱和固定床反应器,研究过程中Ca（OH）₂表面和气相的成分变化。结果表明:SO₂吸附在Ca（OH）₂表面形成的CaSO₃不易被O₂氧化,但可以被NO₂氧化。同时脱除过程中,NO₂对CaSO₃的氧化具有选择性:930～936 cm^-1位置的红外吸收峰在反应过程中先升高后降低,980～995 cm^-1位置的红外吸收峰只升高不降低。无O₂条件下,参与反应的NO₂以接近1∶1的比例转化为NO,而有O₂条件下Ca（OH）₂同时脱除NO₂和SO₂时,Ca（NO₃）₂的含量明显增加,且反应前期CaSO₄的生成速率加快。更多还原

【Abstract】 In order to analyze the fixation and oxidation reaction of SO₂ in simultaneous removal of SO₂ and NO_xby Ca（OH）₂,and the influence of O₂and NO₂on this progress,DRIFTS（diffuse reflectance infrared Fourier transform spectrometry） and fixed bed reactor were used respectively for composition changes of solid and gas phase at 100℃and 0%RH.The results showed that firstly SO₂ was rapidly adsorbed on Ca（OH）₂ to form CaSO₃,which could hardly be oxidized by O₂,but could be oxidized to CaSO₄by NO₂.CaSO₃ showed selectivity during simultaneous removal process,of which the infrared absorption peak at the position of 930～936 cm^-1first increased and then decreased,while the peak at 980～995 cm^-1monotonically increased.When SO₂ and O₂ coexisted in the gas,it could react with Ca （OH）₂to form CaSO₄.When NO₂and SO₂ were simultaneously removed by Ca（OH）₂ in the absence of O₂,the ratio of produced NO/consumed NO₂ was around 1∶1,but in the presence of O₂,the content of Ca（NO₃）₂ increased significantly,and the formation rate of CaSO₄ was accelarated in the early stage of reation.更多还原