低温等离子体强化燃煤烟气Hg~0氧化的气氛影响及特性分析

发布时间：2018-11-20 07:38

【摘要】：为了研究燃煤烟气成分对低温等离子体氧化元素汞的影响,以石英玻璃管为阻挡介质,内插不锈钢棒为高压放电极,利用交流高压放电产生低温等离子体强化模拟烟气中Hg~0氧化.研究输入能量和烟气成分对模拟烟气中Hg~0形态转化与协同脱硫脱硝的影响规律.结果表明,初始时Hg~0氧化率随输入能量增大而提高,原因是模拟烟气中O_2分解产生的O自由基数目增多,但输入能量过大会促使模拟烟气中N_2分解,生成NO并消耗O自由基,导致Hg~0氧化率下降.烟气中O_2和CO_2含量增大,分解产生的自由基O数量增多,有利于Hg~0氧化反应.低温等离子可将NO和SO_2分解成N2和S,同时产生能够促进Hg~0氧化的O自由基,因此低温等离子促进NO和SO_2氧化Hg~0的同时可实现脱硫脱硝的目的.
[Abstract]:In order to study the effect of coal smoke composition on elemental mercury oxide in low temperature plasma, quartz glass tube was used as barrier medium and stainless steel rod was inserted as high pressure discharge pole. Hg~0 oxidation in simulated flue gas was enhanced by low temperature plasma generated by AC high voltage discharge. The effects of input energy and flue gas composition on Hg~0 morphological transformation and synergistic desulphurization and denitrification in simulated flue gas were studied. The results show that the oxidation rate of Hg~0 increases with the increase of input energy at the beginning, because the number of O free radicals produced by the decomposition of O _ 2 in simulated flue gas increases, but the excessive input energy promotes the decomposition of N _ 2 in simulated flue gas. NO was formed and O free radical was consumed, which resulted in the decrease of Hg~0 oxidation rate. The content of O _ 2 and CO_2 in flue gas increased, and the amount of free radical O _ 2 increased, which was beneficial to the oxidation of Hg~0. Low temperature plasma can decompose NO and SO_2 into N2 and Sand produce O free radical which can promote Hg~0 oxidation. So low temperature plasma can promote NO and SO_2 oxidation of Hg~0 and realize the purpose of desulfurization and denitrification at the same time.
【作者单位】：东南大学能源热转换及其过程测控教育部重点实验室;
【基金】：国家自然科学基金资助项目(51076030,51376046) 中央高校基本科研业务费专项资金资助项目江苏省研究生科研创新计划资助项目(KYLX_0184,CXZZ13_0093,KYLX_0115)
【分类号】：X701

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