活性炭吸附回收油气的研究

A STUDY OF RECOVERING GASOLINE VAPOR ON ACTIVATED CARBON

以活性炭为吸附剂吸附分离油气与氮气的混合气,采用氮吸附法表征活性炭的孔结构,分析活性炭孔隙结构、油气的进口浓度和吸附床层尺寸对吸附性能的影响,探讨真空度和脱附时间对脱附性能的影响。结果表明,活性炭对油气的吸附能力取决于其孔径为1～2 nm孔的发达程度;虽然增大进口油气浓度可提高穿透吸附量,但是要以缩短穿透时间和较高的床层温升为代价;较大的床层尺寸可在提高穿透吸附量的同时保证较长的穿透时间和较低的床层温升;降低真空度、延长脱附时间有利于油气的脱附,但是在满足较高脱附率的同时要兼顾到操作费用的降低。

Using activated carbon（AC）to recover gasoline vapor from the mixture of oil and nitrogen characterized was studied. Three AC adsorbents were involved and their pore structures by nitrogen adsorption measurement. The effect of AC pore structure, the vapor were inlet concentration of oil vapor and the size of the fixed bed on the adsorption capacity,as well as the vacuum degree and desorbing time on the desorption capacity were investigated. Results showed that the adsorption capacity of oil vapor on AC was depended on the volume of pores having diameter in the range of 1-2 nm. The adsorption capacity of oil vapor could be increased with the increase of inlet oil concentration, yet the breakthrough time was shortened and the temperature rise of the adsorption bed could be extremely high. Large bed size was helpful for the increase of adsorption capacity as well as the extension of breakthrough time and keeping a moderate temperature rise of the bed. Gasoline vapor could be fully desorbed under a lower vacuum degree and a longer time while considering the operation cost simultaneously.