【作者】 张曼娜；

【导师】 邱建荣；

【作者基本信息】 华中科技大学 ， 热能工程， 2009， 硕士

【摘要】 活性炭纤维（ACF）干法吸附技术是一种较有前途的联合脱除多种燃煤电厂污染物的综合治理方式。本文采用先硫酸后氨水的方法对ACF进行改性,分析了改性对ACF脱除VOC（甲苯作为VOCs的代表物）的影响,同时考察了不同浓度氧气、反应温度、烟气湿度等对改性ACF脱除甲苯的影响,并对ACF同时脱除多种烟气组分（SO₂、NO和VOC）的协同作用及相互影响进行了研究。试验表明,改性后ACF平均孔径和比表面积相比未改性的无明显变化,但含氧官能团的羰基增多,这在一定程度上造成改性ACF对甲苯的脱除效率比未改性的高。氧浓度与甲苯脱除效率正相关,当氧气浓度超过5%时,进一步提高氧浓度几乎不能提高甲苯的脱除效率。改性ACF低温脱除甲苯的最佳温度为40℃,水蒸气的存在抑制了ACF对甲苯的脱除。NO和SO₂的存在对VOC的脱除均有抑制作用,而且随着NO或者SO₂的浓度的升高,VOC的脱除效率呈降低趋势,同样浓度的NO相比SO₂的影响更大。当烟气中存在O2,对于VOC的脱除效率,不同气氛组合的脱除效率比较如下:NO+SO₂+VOC< NO+VOC<SO₂+VOC<VOC。有水蒸气时,对于VOC的脱除效率,不同气氛组合的脱除效率比较则为:NO+VOC< NO+SO₂+VOC < SO₂+VOC<VOC。VOC对NO和SO₂的脱除有抑制作用,并可以把已经在ACF上物理吸附的NO或SO₂解吸出来。NO、VOC、SO₂同时存在时,NO对SO₂的促进作用不明显。水蒸气的存在对甲苯和NO的脱除都会产生不利影响,但当VOC和NO同时存在时,水蒸气对VOC更为不利。水蒸气对ACF单独脱除SO₂有利,对VOC脱除不利,当ACF联合脱除VOC和SO₂时,水蒸气对SO₂仍有利。更多还原

【Abstract】 The coal power plants releases SO₂, NOX, Hg, VOCs to the atmosphere, and without control the released pollutants will contaminate the environment and harm health of human. The activated carbon can dissolve this well. However, activated carbon fiber （ACF） is more effective than activated carbon. ACF were immersed into diluted sulfuric acid and then ammonia, which increase the oxygen function groups and nitrogen functional groups. But the distributing of pore distribution changes little.And we found that modified ACF has higher efficiency on the removal of volatile organic compounds （VOCs）.Toluene were used as representatives of VOCs. The results showed that the ability of ACF removing VOCs increases little with the concentration of the O2. And the efficiency seldomly increase when the oxygen concentration exceeds 5%. However, catalytic oxidation is not the most important. The suitable temperature for toluene removal is 40℃. Vapor is against adsorption of VOCs.The SO₂ and NO both against the removal of VOCs. And the VOC removal effect is decrease with the SO₂ or NO, no matter if the vapor is exist. If the O2 exist, the effect of the removal of VOCs when the NO, SO₂ and VOCs all exist< the effect when NO and VOCs exist< the effect when both NO and VOCs exist < when only VOCs exist. If the O2 and vapor both exist, the effect of the removal of VOCs when the NO, and VOCs all exist< the effect when NO, SO₂ and VOCs exist< the effect when both NO and VOCs exist < when only VOCs exist.No matter if vapor exist, the VOCs against the removal of the NO and SO₂. It can desorb the NO and SO₂. Although NO can enhance the removal of SO₂ by ACF, when VOCs exist, the enhancement is unconspicuous. Vapor is harm to both VOCs and NO, but when VOCs and NO both exist, vapor does more harm to the removal of VOC. When both VOCs and SO₂ exist, vapor still enhance the removal of SO₂. But when VOCs, NO, SO₂ all exist, low concentration of vapor （0.2%） affect little to the removal of SO₂. Keyword: Activated carbon fiber; modification; VOCs; simultaneously remove更多还原