氧化吸收工艺尾气焚烧炉中SO_(3)生成动力学北大核心CSCD

目的研究采用氧化吸收工艺的硫磺回收装置尾气焚烧炉操作参数和气体条件变化对SO_(3)生成的影响,以减少尾气焚烧炉中SO_(3)的生成。方法在实验室中利用管式炉模拟尾气焚烧炉研究SO_(3)的生成,采用控制冷凝法测定反应管出口气体中SO_(3)含量。仅在气相条件下研究不同工况和气质条件对SO_(3)生成的影响。结果SO_(2)和O_(2)体积分数增加会增加SO_(3)体积分数,SO_(3)体积分数与反应气体停留时间呈线性关系,在反应体系中引入CS2也能明显提高SO_(3)体积分数,但对SO_(3)生成率无明显影响;反应体系中引入少量CH4也会明显提高体系中SO_(3)体积分数,并提高SO_(3)生成率。结论明确了SO_(3)生成情况与尾气焚烧炉操作参数和气质条件的关系。SO_(3)生成对反应物SO_(2)和O_(2)的反应级数分别为0.87和0.45,SO_(2)氧化过程的表观活化能为69.04 kJ/mol。

Kinetics of SO3 formation in the tail gas incinerator of oxidized absorption technology

ObjectiveThe aim is to reduce the formation of SO₃ in the tail gas incinerator by analyzing the effects of operating parameters and gas conditions on the formation of sulfur trioxide(SO₃) in the tail gas incinerator of sulfur recovery unit using oxidation absorption process. Methods In the laboratory, the formation of SO₃ was studied by using tube furnace to simulate tail gas incinerator, and the content of SO₃ in the outlet gas of reaction tube was determined by controlled condensation method. The effects of different working conditions and gas conditions on SO₃ formation were studied only under gas phase conditions. ResultsThe increase of SO₂ and O₂ volume fraction would increase the SO₃ volume fraction, and the SO₃ volume fraction had a linear relationship with the residence time of the reaction gas. The introduction of CS₂ in the reaction system could also significantly increase the SO₃ volume fraction, but had no significant effect on the SO₃ formation rate. A tiny proportion of CH₄ in the gas had significant effect on the SO₃ volume fraction in the system and increase the SO₃ formation rate. ConclusionsIt is clarified the relationship between SO₃ formation and operating parameters and gas quality conditions of tail gas incinerator. The reaction orders of SO₃ formation to SO₂ and O₂ were 0.87 and 0.45, respectively. The apparent activation energy of SO₂ oxidation process was 69.04 kJ/mol.