【作者】 杨斌武；

【导师】 蒋文举；

【作者基本信息】 四川大学 ， 环境工程， 2003， 硕士

【摘要】 本文对活性炭在微波场中的升温行为、活性炭的微波改性及其脱硫以及载硫活性炭的微波解吸进行了比较系统的研究。 试验结果显示，活性炭在微波场中的升温速率很快，在试验条件下，180秒后基本达到温度最大值。活性炭在微波场中的升温过程可分为三个阶段：线性升温期、对数升温期和稳定期。影响活性炭升温过程各因素的重要性依次是：微波功率＞＞加热时间＞载气量＞＞活性炭质量。活性炭的升温速率和温度最大值随微波输入功率增大而增大；随载气量的增大而减小；受活性炭质量的影响极小。 微波改性活性炭的脱硫性能远好于原炭，试验中改性活性炭相对于原炭的吸附容量增加率高达144.3％～288.0％。改性后活性炭表面的孔隙结构没有发生明显的变化；而表面碱性基团数量和N元素含量明显增加。微波改性后活性炭脱硫能力提高的主要原因是炭表面碱性基团数量和N元素含量的增加。 微波解吸过程中SO₂的脱附速率和回收速率都很快，试验中反应570秒就基本解吸完全。微波解吸出口SO₂的体积浓度和质量回收率都很高，试验中最高分别达到25％和99.7％。增加微波功率既有利于获取高浓度的SO₂气体，又有利于提高SO₂的回收率；减小载气量有利于获取高浓度SO₂气体，但不利于SO₂的回收；活性炭质量对SO₂体积浓度和回收率的影响很小。各因素对SO₂回收率的影响程度依次是：解吸时间＞载气量＞微波功率＞活性炭质量。载硫活性炭的微波解吸反应遵从一级动力学模式，脱附速率常数k随微波功率增加呈对数增加，随载气量增加呈指数增加。更多还原

【Abstract】 The behavior of activated carbon’s temperature increasing in the field of microwave, the modification of activated carbon(AC) by microwave heating and its adsorption capability of SO2, the desorption of SO2 from AC by microwave are investigated in a bench scale.Experimental results show that AC can strongly absorb and fully use microwave energy and its temperature will increase rapidly and reach the maximum after 180 seconds. The temperature rising process of the AC in microwave’s field can be divided into three steps: linearity rise step, logarithm rise step and stability step. The order of degree that the investigated factors affects the AC’s temperature changing is: input power of microwave>>heating time>carrier gas volume flux>>activated carbon weight. Moreover, the higher the microwave power is, the quicker the AC’s temperature increase and the higher the temperature’s maximum is. On the other hand, smaller N2 volume flux is benefit to AC’s temperature-rising. Comparatively, activated carbon weight is not so much important as far as AC’s temperature changing process is concerned.The desulfurization capability of modified activated carbon by microwave is higher than that of original one ranging from 144.3% to 288.0%. The change of porous texture of Modified AC by microwave is not so much obvious compared with original one, while the quantity of surface basic functional groups and Nitrogen elements of modified AC is much more than original one.The process of desorption and reclamation of SO2 from activated carbon is so rapid that the AC’ regeneration could be nearly completed within 570 seconds. The maximal volume content of SO2 in carrier gas (N2) and the maximal mass reclamation ratio of sulfur dioxide is about 25% and 99.7% respectively. Increasing input microwave power benefits obtaining higher volume content of SO2 and more mass ratio of reclaimed SO2, and decreasing N2 volume flux benefits attaining higher volume content of SO2 but is not good as to the reclamation of SO2 Comparatively, the influence of AC’s weight on the desorption and reclamation of SO2 is very little. The order of degree that those factors affects the reclamation ratio of SO2 is: reaction time > carrier gas volume flux > power of microwave >activated carbon weight.The desorption process of sulfur dioxide from activated carbon by microwave promotion accords with the first order kinetics model, and the rate constant raises logarithmically with the increase of microwave power and exponentially with the carrier gas volume.更多还原