Simulation of CO2 Capture Process in Flue Gas from Oxy-Fuel Combustion Plant and Effects of Properties of Absorbent

Oxy-fuel combustion technology is an effective way to reduce CO2 emissions. An ionic liquid [emim][Tf2N] was used to capture the CO2 in flue gas from oxy-fuel combustion plant. The process of the CO2 capture was simulated using Aspen Plus. The results show that when the liquid-gas ratio is 1.55, the volume fraction of CO2 in the exhaust gas is controlled to about 2%. When the desorption pressure is 0.01 MPa, desorption efficiency is 98.2%. Additionally, based on the designability of ionic liquids, a hypothesis on the physical properties of ionic liquids is proposed to evaluate their influence on the absorption process and heat exchanger design. The process evaluation results show that an ionic liquid having a large density, a large thermal conductivity, and a high heat capacity at constant pressure is advantageous. This paper shows that from capture energy consumption and lean circulation, oxy-fuel combustion is a more economical method. Furthermore, it provides a feasible path for the treatment of CO2 in the waste gas of oxy-fuel combustion. Meanwhile, Aspen simulation helps speed up the application of ionic liquids and oxy-fuel combustion. Process evaluation helps in equipment design and selection.

Automated summary

Oxy-fuel combustion technology is effective in reducing CO2 emissions. The use of an ionic liquid for CO2 capture in flue gas was simulated and evaluated using Aspen Plus. The study found that a liquid-gas ratio of 1.55 and a desorption pressure of 0.01 MPa resulted in high efficiency. Furthermore, the research suggests that ionic liquids with certain physical properties are advantageous in the absorption process and heat exchanger design. The paper highlights the economic benefits of oxy-fuel combustion and provides a feasible approach for treating CO2 in waste gas. Aspen simulation and process evaluation contribute to equipment design and selection.