Simulation and optimization of low energy consumption and high efficiency capture process for low concentration CO2in flue gas
The capture of CO2 from flue gas is commonly achieved using chemical absorption processes.The process requires optimization to enhance CO2 removal efficiency while minimizing energy consumption.This paper used Aspen Plus simulation to model both the typical amine-based CO2 capture process and an optimized low-energy,high-efficiency CO2 capture process.The effects of MEA+H2O and MEA+MDEA+H2O absorbent circulation and absorption temperature on CO2 removal rate and energy consumption of lean solution regeneration were investigated.The results revealed that both the typical amine-based process and the low-energy,high-efficiency process met the design requirements of capturing CO2 with a purity of ≥90％and a removal efficiency of＞90％,while keeping energy consumption below 3.0GJ/tCO2.The optimal solvent circulation rates were 60m3/h for MEA+H2O and 65m3/h for MEA+MDEA+H2O.The absorption temperature range was 40-45℃.Under the same absorption agent and circulation rate,both processes achieved similar CO2 removal rates and recovery efficiencies.The low-energy,high-efficiency CO2 capture process reduced the energy consumption for lean liquid regeneration by 0.13GJ/tCO2.After the optimization of CO2 capture process,equipment investment and utility consumption costs could be significantly reduced.
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