Study On Absorption Characteristics Of CO₂ Capture By Organic Amine/Ethylene Glycol Ethers Solvent Liquid-solid Phase-chasing System

The main reason for the global greenhouse effect is that the massive emission of carbon dioxide（CO₂）in the flue gas of coal-fired power plants.The CO₂ concentration in the atmosphere can be effectively reduced through CO₂ capture and storage technology.However,the problem of traditional CO₂ absorption process for water-based organic amine solution is high regeneration energy consumption,and its industrial application is limited.Therefore,the development of efficient and energy-saving CO₂ absorbent has become the core issue and key technology of industrial application of carbon capture.After absorbing CO₂,liquid-solid phase change absorbent will form two phases of rich and poor with significant difference in CO₂content.It only needs to heat and desorption the rich phase for regeneration,which provides a new idea to reduce the energy consumption of absorbent regeneration.In this thesis,new liquid-solid phase change absorbents were proposed by blending 3-Methylaminopropylamine（MAPA）/Diethylenetriamine（DETA）with Ethylene glycol ethers（EGEs）.In order to evaluate the application potential of EGEs solvent as cosolvent,a gas-liquid equilibrium experimental platform was designed and built in this paper,The viscosity,vapor pressure and CO₂ solubility of Diethylene glycol monomethyl ether（DEGMME）,Diethylene glycol dimethyl ether（DEGDME）and Triethylene glycol dimethyl ether（TEGDME）were measured at different temperatures,the Henry coefficient of CO₂ in EGEs solvent was calculated,the effects of physical properties,temperature and molecular structure on the solubility of CO₂ were clarified.To investigate the carbon capture performance of organic amine glycol ether liquid-solid phase change system,an absorption desorption experimental platform was designed and built.The saturated absorption amount,absorption load and apparent absorption rate of CO₂ in MAPA/DETA-DEGMME liquid-solid phase change system at different mass fractions and temperatures were measured,and the influence laws of amine concentration and temperature on absorption properties were analyzed.In CO₂desorption experiment,the desorption amount,desorption efficiency and apparent desorption rate of different mass fraction MAPA/DETA-DEGMME nonaqueous phase change system and corresponding lean water system were measured,the effects of amine concentration and water content on desorption performance were clarified.Based on the way of electric energy consumption,the energy consumption estimation method was established to determine the regeneration energy consumption in the process of anhydrous absorption and lean water absorption.MAPA/DETA-DEGMME system has the advantages of large absorption capacity and high apparent absorption rate.Water poor solvent has better absorption capacity than 30wt%ethanolamine（MEA）aqueous solution in promoting desorption and regeneration,The research results can provide data support for the development of efficient and low-cost CO₂ capture technology,and have important application value.