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添加剂CH₃COONH₄对介质阻挡-电晕放电耦合法脱除NO、SO₂的影响

Effect of additive CH₃COONH₄ on removal of NO and SO₂ by dielectric barrier-corona discharge coupling method

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【Author】 KAN Qing;YANG Lan;LIU Lu;MA Xiaoxun;School of Chemical Engineering, Northwest University, International Scientific and Technological Cooperation Base for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advance Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi;

【通讯作者】马晓迅;

【机构】西北大学化工学院国家碳氢资源清洁利用国际科技合作基地陕北能源先进化工利用技术教育部工程研究中心陕西省洁净煤转化工程技术研究中心陕北能源化工产业发展协同创新中心；

【摘要】采用自行研究设计的介质阻挡-电晕放电等离子体反应装置在模拟烟气中进行NO、SO₂的脱除研究。考察了O₂、CO₂、水蒸气等气体组分对脱除NO、SO₂的影响,并进一步探讨了添加剂CH3COONH4对脱除NO、SO₂的影响及作用机理。实验结果表明:O2、CO₂和水蒸气浓度的增加对NO脱除有抑制作用,而引入CH3COONH4后,这些抑制作用会被减弱,使NO的脱除率得到大幅度提升,但这些抑制作用不会完全消除。在引入CH₃COONH₄后,气体组分和输入电流的变化对脱除SO₂的影响不明显,SO₂脱除率可达到94%左右。在N2/O2/CO2/H2O/NO/SO₂体系中加入0.27%的CH₃COONH₄后,NO初始浓度不变的条件下,SO₂含量较少时,对NO的脱除影响不明显,随着SO₂浓度的增加,NO的脱除率不断下降,增加CH₃COONH₄的添加量可消除SO₂的影响;另一方面,在SO₂初始浓度恒定的条件下,随着NO含量的增加,SO₂的脱除率保持在94%左右。在N2/O2/CO2/H2O/NO/SO₂体系中加入0.51%的CH3COONH4后,输入电流2.5A时,NO的脱除率达到72%。更多还原

【Abstract】 The removal of NO and SO₂ in simulated flue gas was studied by self-designed dielectric barrier-corona discharge plasma reactor. The effects of gas composition such as O2 concentration,CO₂ concentration and water vapor on the removal of NO and SO₂ were investigated. The effect of additive CH₃ COONH₄ on NO and SO₂ removal and its mechanism of action were also discussed. Experimental results showed that the increase of O₂ concentration, CO₂ concentration and H₂ O vapor concentration would inhibit the removal of NO. After the introduction of CH₃ COONH₄, these inhibitory effects would be weakened and the removal rate of NO would be greatly increased, but its inhibitory effects would not be completely eliminated. After the introduction of CH3 COONH4 into N2/O2/SO₂ system, the influence of gas composition and input current on SO₂ removal was not obvious, and the removal rate of SO₂ could reach about 94%. When 0.27%CH3 COONH4 was added into N2/O2/CO2/H2 O/NO/SO₂ system, under the initial concentration of NO was constant, When the content of SO₂ was low, the effect on NO removal was not obvious, the removal rate of NO decreased with the increase of SO₂ concentration, the effect of SO₂ could be eliminated by increasing the addition of CH3 COONH4. On the other hand, under the condition of constant initial concentration of SO₂, with the increase of NO content, the removal rate of SO₂ remained around 94%. When 0.51%CH₃ COONH₄ was added into N₂/O₂/CO₂/H₂ O/NO/SO₂ system, the removal rate of NO reached 72% when the input current was 2.5 A.更多还原