活性炭流化床对VOCs的吸附条件及吸附边界曲线的研究

Study on adsorption conditions and adsorption boundary condition curve of activated carbon fluidized bed to VOCs

对球形活性炭流化床在VOCs吸附过程中吸附条件的选择进行了分析研究,分别探究了进气浓度、气体流速、床层高度、床层数对流化床吸附性能的影响。并且进一步比较了流化床和固定床对丙酮、乙酸乙酯、对二甲苯的吸附,得到不同的固定床-流化床吸附条件边界曲线,该边界曲线将吸附条件坐标系划分为2个区域,固定床和流化床分别在对应的区域内达到更好的吸附性能,并通过实验验证了该理论的正确性。边界曲线与VOCs的性质有关,极性越大流化床的操作范围越小。

The selection of adsorption conditions for the adsorption process of VOCs by a spherical activated carbon fluidized bed are analyzed and studied.The effects of the concentration of inlet gas,the flow rate of VOCs,the height of bed and the number of bed layer on the adsorption performance of the fluidized bed are investigated.The fluidized bed is compared with the fixed bed in the adsorption of acetone,ethyl acetate and para-xylene,from which different fixed bedfluidized bed adsorption boundary condition curves. This boundary condition curve divides the adsorption condition coordinate system into 2 regions and the fixed bed and the fluidized bed can separately achieve better adsorption performance in their corresponding regions. The correctness of the theory is verified by experiments. The boundary condition curve has relationship with characteristics of VOC. The higher polarity of VOC means less operation scope for fluidized bed.