چكيده به لاتين
In this study, the rate of absorption of carbon dioxide in solution PZ, MEA, MDEA is studied.for modeling the reactive absorption process, using film theory and simultaneously solve all equations in the absorption, mass balance equations and Equilibrium equations , concentration of all components and mass transfer flux in film was calculated.The values obtained were calculated by considering the movement of the film. To evaluate the result of model, experimental data for absorption of CO2 in consider solution isused. The effect of dimensionless parameters such film parameter, loading, the ratio of partial pressureof acid gas to the total pressure and the ratio of film thickness on mass flux is studied.
For thermodynamic modeling ternary system Amen, water and carbon dioxide and acid gases solubility of the amine solution φ-γ method is used. Virial equation of state is used to model the vapor phase and according to the liquid phase is a electrolyte solution that the developed UNIQUAC-Pitzer electrolyte model is used.
The deviation of the experimental data for mass flux by calculating the average relative error, is about 5.302 percent for PZ solution and equal to 8.24% and 6.56%, respectively for MEA solution MDEA.Taking into account the movement of the film, the mass transfer flux was affected and the error rate was reduced. 0.1 percent for PZ solution, 0.6 and 1.1 for MEA and MDEA solutions respectively.
According to the results obtained in this study, respectively, the effects of the reaction, penetration, speed film and addy influence on mass transfer flux more. Reaction and penetration Influence on the mass transfer flux averages more than 35% compared to the speed and eddy penetration and the contribution rate of mass transfer flux, depends on the speed of film, laboratory conditions and the type of amin, from very low values for laminar flow and during the current 30 percent to nearly turbulent flow is different. at low speeds, influence of eddy in mass flux is low. Change in speed of film in absorption by PZ is low impact in mass flux, because the rate of reaction in PZ sulotion is more than MEA and MDEA. In MDEA sulotion Due to the low reactio rate, more time needs for reaction and chang hin speed of film more influence in mass flux. So consider moving film is more effective in absorbing reactive with slow rate of reaction.
Keywords: Reactive absorption of CO2, Mass transfer flux, Eddy diffusion, Film model, Film convection
