Experimental Study On The Continuous Separation Of CO₂/N₂ With Absorption-adsorption Method

In recent years,as the demand for fossil energy increases,a large amount of flue gas is exhausted into the atmosphere.The increase of CO₂ emissions causes global warming and the greenhouse effect.In this thesis,the absorption-adsorption method was adopted for separation of flue gas CO₂/N₂ using ZIF-8/glycol-water slurry.Firstly,a set of CO₂absorption-adsorption experimental apparatus was set up to conduct continuous separation experiment.Then the effects of different operating conditions on the CO₂ separation were investigated in detail.Meanwhile,the regeneration performance of ZIF-8 slurries used in this work was evaluated.The main contents of this research are as follows:（1）A set of absorption-adsorption continuous separation CO₂ apparatus was set up,which is mainly composed of an absorption tower and a desorption tower.（2）The regeneration performances of ZIF-8/glycol and ZIF-8/glycol-water slurry were investigated.The experimental results show that the ZIF-8/glycol slurry can be regenerated,while the sorption performance of ZIF-8/glycol-water slurry decreased after the first regeneration cycle.After that the regeneration performance remained unchanged with some CO₂ sorption capacity.（3）Continuous separation experiments were conducted to investigate the effects of different experimental factors on the separation of CO₂/N₂ using absorption-adsorption method.The experimental results show that the separation effect using sintered plate gas distributor is much better than that using other orifice distributors.Low temperature,low gas velocity,and high liquid velocity are beneficial to the capturing of CO₂ using the slurry,but which will lead to a small amount of gas sorption capacity and a large load of desorption tower.Higher desorption temperature is contribute to the regengration of the slurry and a variety of desorption methods can be combined in the actual production process.