摘要
利用3种活性炭吸附分离汽油蒸汽和空气的混合气，研究了其吸附回收油气的动力学、热力学性能。活性炭AC1、AC3在20℃时的吸附容量分别为0．295g／g、0．189g／g，30℃时为0．284g／g、0．165g／g。活性炭吸附高含量油气时，吸附热高，如吸附油气摩尔分数为0．3mol／mol时，吸附床温升达50～60℃。活性炭导热系数为0．15～0．20W／m·℃，吸附过程可视为绝热吸附。建立了活性炭吸附油气热效应估算式，可用来评价活性炭吸附容量、进料油气摩尔分数、油气回收率与活性炭温升的关系。活性炭解吸宜先采取真空解吸，在解吸后期适当加入微量微热空气吹扫而深度脱附。解吸操作压力应低于1kPa，解吸时间可控制在60min内，热空气温度宜控制在50℃以下。油气吸附分离方法将主要用作其他分离方法的深度处理，以确保油气回收设备尾气达标排放。
Activated carbon （AC） adsorption was applied to separate and recover the high concentration petroleum vapor from the great deal of vapor-air mixtures emitted from the tank or tanker in the process of light petroleum products loading, storage, transportation, or distribution. The dynamics properties and thermodynamics effects of 3 activated carbons were investigated in adsorbing and separating gasoline vapor from the mixtures. Different activated carbons behave distinct adsorption capacities, such as 0. 295 g/g and 0. 189 g/g for AC1 and AC3 at 20 ℃ , and 0. 284 g/g and 0. 165 g/g for them at 30 ℃ respectively. Adsorption heat of activated carbon to the high concentration vapor is obviously high, such as the temperature rise of adsorption bed up to 50 - 60 ℃ for the vapor mole fraction of 0.3 mol/mol. The adsorption should be as adiabatic for low heat transfer coefficient of activated carbons of 0.15 -0.20 W/m ·℃. An evaluation formula for the heat effect of the adiabatic adsorption was deduced to evaluate the temperature rise of adsorption bed with the activated carbon adsorption capacity and the inlet vapor mole fraction and the vapor recovery efficiency. The rich-carbon should be desorbed by vacuum system, and then by heat air of right flow and temperature induced to the rich-carbon bed for further resorption. The desorption pressure and time were recommended to lower than 1 kPa and 60 min respectively, and the temperature of the heat air to lower than 50 ℃. In order to make hydrocarbon concentration in the outlet mixtures from vapor recovery system reach the allowably value, gasoline vapor adsorption recovery unit was recommended to take action with other recovery unit and play later-stage further recovery role.
出处
《环境工程学报》
CAS
CSCD
北大核心
2007年第2期73-77,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(20406007)
江苏省"六大人才高峰"资助项目(06-A-042)
关键词
汽油
油气回收
活性炭
吸附
解吸
热效应
gasoline
gasoline vapor recovery
activated carbon
adsorption
desorption
heat effect
