Research Of Technology On Absorbing CO₂ And H₂S In Associated Gas By Anolamine Using Aspen Plus Simulation Combined With Chemistry Analysis

The world's energy structure changes greatly since 1970s.The 1st and2nd energy crisis makes all over the world realize that relying on traditional fossil energy controlled by OPEC would impede global economic and development of industry.Ever since then,many countries pay increasing attention to the development of Petrochemical energy Technology.To relieve energy crisis,China imported associated gas Processing device,and mastered exploitation and process technology independently in 2000.However,during the exploration of associated gas,sour gases would appear in associated gas,such as CO₂,H₂S,etc.,inevitably,and they will corrode pipeline and equipment and affect calorific value of exported natural gas.Therefore a research on absorbing sour gases in associated gas by a mixture of anolamine is of great significance.The main research contents and results of this paper are as follows:1.Putting forward an analysis method on absorbing process with high-risk component such as CO₂,H₂S,etc.,which uses iodometry determine H₂S content and barium hydroxide determine CO₂ content.It is suitable for analysis on associated gas of field acquisition under non-laboratory conditions.2.Build a process of absorbing sour gases in associated gas using Aspen Plus software.Simulate absorbing sour gas reactions using different proportion of MDEA/MEA solution and compare the results with those of chemistry analysis experiment to prove its reliability,the accuracy of H₂S ranges from 63%to 100%;the accuracy of CO₂ ranges from 89.69%to98.48%.3.Study the relationship among the absorption of H₂S and CO₂,changes of temperature and proportion of MDEA/MEA solution,then guide the project of absorbing sour gases under different conditions in fields using concluded laws.4.When associated gases with different content in Liaohe,Tazhong,Yulin are absorbed,with increasing amount of MEA,more CO₂ absorbed;with increasing amount of MDEA,more H₂S absorbed;nevertheless,when12%MDEA solution absorb associated gases in yulin,less H₂S absorbed.5.To associated gases in liaohe,the closer MEA amount approach 3%,the wider range of temperature CO₂ could get when reaching desired goal,the further MEA amount approach 3%,the narrower range of temperature CO₂could get when reaching desired goal;the more amount MDEA exist,the wider range of temperature H₂S could get when reaching desired goal;to associated gases in tazhong,the more amount MEA exist,the wider range of temperature CO₂ could get when reaching desired goal;the more amount MDEA exist,the wider range of temperature H₂S could get when reaching desired goal;to associated gases in tazhong,the more amount MEA exist,the wider range of temperature CO₂ could get when reaching desired goal,nevertheless when MEA is less than 2%,the temperature scope increases for CO₂ when reaching desired goal,ranges from those in 5%MEA to 7%MEA;the more amount MDEA exist,the wider range of temperature H₂S could get when reaching desired goal,nevertheless when MDEA is more than 12%,the temperature scope decreases for H₂S when reaching desired goal,ranges from those in 7%MDEA to 9%MDEA.