Numerical Simulation Of Absorption Of Carbon Dioxide And Statistic Analysis Of Influence Factors

The carbon dioxide emissions catch people’s wide attention with the intensification of the greenhouse effect. Capturing CO₂ from flue gas directly is the most popular and effective method. However, the cost of carbon dioxide capture technology is extremely expensive. Computer numerical simulation contributes to analysis of data under complex reaction and guidance of the real process. In this paper, the carbon dioxide capture process with the absorbent of ethanol amine is simulated at the scale of strctured packing unit and the whole process. The simulation results are analysed in statistic.The mathematical model of CO₂ reactive absorption is summarized. The simulation of CO₂ reactive absorption is described by the equations of mass conservation, momentum conservation and energy conservation as well as chemical reaction kinetics.Fluent is applied to the simulation of CO₂ absorption in structured paking unit. On basis of CFD equations, the reactive asorption process with mass transfer and chemical reaction is modeld by combining species transport model, the general finite-rate model, chemical reaction kinetics with permeation model. The reaction kinetic parameters are calculated in the method of regression aanlysis. The influences of different simulation conditions are analyzed to find the interaction mechenism and significance. It’s found that the concentration of ethanol amine takes the most significant impact on the absorption.Aspen Plus is adopted to simulate the whole process containing asoption and stipper of CO₂ based on non-equilibrium stage model, ENRTL model and RK state equation. Different conditions such as stage, CO₂ concentration, MEA concentration and gas-liquid flow rate ratio are controled to dig the influence information for CO₂ absorption. The resulsts keep consistent with unit results. At the end of the paper, the merit and demerit of unit simulation and process simulation for CO₂ asobsorption is summarized.