A Simple Mathematical Model and Computer Simulation of Non-isothermal Gas Absorption in Packed Tower

Oxygen-enriched combustion technology can effectively achieve residual capture, but the existence of acid gases such as NO_x and SO_x is not conducive to the transportation and storage of CO₂. The compression of CO₂ discharged from the packed tower is a necessary process before transportation. Therefore, the study of combined desulfurization and denitrification of flue gas under high pressure is of great significance to the application of carbon capture and storage technology. Based on the mass transfer coefficients obtained from experiments, a coupled model of mass transfer and kinetics of the bubbling reactor is established for the combination of reaction mechanism and kinetics of non-isothermal gases, and this unsteady state problem is solved by the Runge-Kutta mathematical method. The simulation study of the product changes in the process of NO and SO₂ absorption alone and combined absorption under different pressures. The results show that: the interaction of NOx and SOx in the liquid phase promotes the absorption of SO₂, NO₂ and the mass production of ${\text{SO}}_{\text{4}}^{\text{2-}}$ and ${\text{HSO}}_{\text{4}}^{-}$ in the liquid phase, and it is also generates a large amount of greenhouse gas N₂O; the increase in pressure is beneficial to ${\text{SO}}_{\text{4}}^{\text{2-}}$, ${\text{SO}}_{\text{4}}^{\text{2-}}$, The production of HADS and HAMS also led to an increase in the production of N₂O.