Research Of Absorption And Regeneration Characteristics Of Organic Amines In The CO₂ Capture Process From The Flue Gas

By using the organic amine to absorb CO₂ and improving the process,it is significant to the global warming and the capture of CO₂ from the flue gas.In this paper,it studied the absorption and regeneration characteristics of 10%MEA/H₂O solution,10%MEA/Methanol solution,10%DEA/H₂O solution and 10%TEA/H₂O solution in the small experiment,the concentration of CO₂ is 15%in the flue gas.The results showed that the CO₂ absorption rate was 8.1×10-5 mol/s in 10%MEA/Methanol,it was 21.1%and 90.5%higher than that of 10%MEA/H₂O and 10%DEA/H₂O,respectively.The absorption tower were filled with Pall ring 16 x 16,structured corrugate packing 500Y and structured mesh packing BX500,and 30%MEA/Methanol was used to absorb CO₂.The results showed that the CO₂ removal efficiency was low when the tower height was lower than 1.5 m.But the CO₂ removal efficiency can reach 98.0%when the tower height was 2.5 m in three different fillers.Concluded,the superior order of three kinds of fillers was,structured mesh packing BX500>structured corrugate packing 500Y>Pall ring 16 x 16.The energy consumption of 10%MEA/H₂O and 10%DEA/H₂O were consists of the evaporation of steam,the sensible heat and the release heat of CO₂.The results showed that the evaporation heat in 10%MEA/H₂O was 57.4%higher,the sensible heat was 0.6%higher and the release heat was 12.2%higher than that of 10%DEA/H₂O,respectively.But the CO₂ removal efficiency was 47.1%higher than that of 10%DEA/H₂O.It was reasonable to select MEA to absorb CO₂.In the absorption tower,in the regeneration of 30%MEA/Methanol solvent,when the solvent flow rate was 30.0 L/h,the temperature of solvent were 40 ?,50 ? and 60 ?,the evaporation heat of the solvent was between 1.2-1.3 MJ/KgCO₂,and the release heat of CO₂ was between 0.8-1.0 MJ/KgCO₂.When the solvent temperature was increased from 40 ? to 60 ?,the sensible heat decreased by 54.1%,So the regeneration energy of 30%MEA/Methanol was mainly reflected in the sensible heat of the solvent.