【摘要】 为提高复合钙基吸附剂对Hg和SO₂的脱除效率,提出通过低温等离子技术改性复合钙基吸附剂,借助N2吸附和傅里叶红外光谱技术对吸附剂进行表征,分析低温等离子改性对复合钙基吸附剂表面理化特性的影响。在固定床吸附实验台上进行脱汞脱硫实验,探究了AC与Ca O质量比、水合条件对汞吸附效果的影响;在优化的实验条件下,探究了低温等离子改性时间和改性功率对复合钙基吸附剂脱汞脱硫的影响规律。实验结果表明:最佳实验条件下制备的复合钙基吸附剂具有良好的比表面积和孔隙结构,可以有效脱除烟气中的Hg和SO₂;低温等离子改性能够增加复合钙基吸附剂表面含氧官能团的数量,对吸附剂脱汞脱硫性能具有重要的影响,低温等离子改性复合钙基吸附剂可以明显提高吸附剂脱汞脱硫的效率;经40W低温等离子改性10 min后的单位质量复合钙基吸附剂对Hg和SO₂的吸附量相对于未改性的分别提高了33.10%和34.71%,低温等离子改性具有明显的优势,是一种具有较大发展潜力的污染物脱除方法。更多还原

【Abstract】 To improve Hg and SO₂ removal efficiency of calcium-based composite sorbent, the simple and efficient non-chemical treatment method was proposed. Calcium-based composite sorbent was treated by non-thermal plasma in air environment and characterized with Fourier transform infrared spectroscopy（FT-IR） and Brunauer-Emmett-Teller（BET） surface area to study the influence of non-thermal plasma modification on the surface physical and chemical properties. Demercuration and desulfurization experiments were carried out in a fixed bed adsorption experimental stage. The mass ratio of AC/Ca O and hydration conditions on mercury adsorption effect were explored, and the desulfurization performance of the adsorbent was also considered. Under the optimized conditions, the effects of non-thermal plasma modification time and power on removal of Hg and SO₂ were investigated. The results showed that the compound calcium-based sorbents prepared under optimum conditions with good surface area and pore structure, can effectively remove Hg and SO₂ in flue gas. Compound calcium-based sorbents treated with non-thermal plasma had higher mercury and SO₂ removal efficiency. The main reason was that non-thermal plasma treatment increased functional groups, which played an important role in Hg and SO₂ absorption. Compared with the unmodified calcium-based sorbent, mercury and SO₂ removal efficiency of sorbent treated by non-thermal plasma with 40 W and 10 min was increased 33.10% and 34.71% respectively. Non-thermal plasmamodification has obvious advantages, which is a potential technology for the removal of pollutants.更多还原