Numerical Study of the Nitrogen Oxides Adsorption and Storage

Adsorption of nitrogen oxides in the micropores of solid sorbent becomes an alternative to storage of compressed gas for the next decades. Thus, the effectiveness of the method of nitrogen oxides concentration in the zeolite micropores is experimentally investigated. The model of mass transfer in the adsorber is presented as non-equilibrium. The formulated mathematical problem is a system of three equations: the kinetic equation, the equilibrium equation and the continuity equation. Solution of the mathematical model was achieved using the finite difference method. Comparison and agreement of the numerical results of the developed model with experimental data was performed, the agreement is within 10-12%. When modeling numerical calculations, the complex of temperatures of 298-318 K and pressure of 0.15-3.5 MPa in the adsorber was covered. Based on the obtained data it was concluded that storage of nitrogen oxides in the adsorber, filled with zeolite is an efficient method of concentrating nitrogen oxides (twice more efficiently compared with the conventional gas compression). Mathematical model adequately describes the concentration process, it is amenable to direct solution and can be used in practice to optimize the operation of adsorber and forecast its basic performance features. This technology also allows to reduce the operating pressure that is a very important economic and technological factor in implementing the process at the industrial level