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smaller number of equations due to the minor number of variables, leading to the reduction of the time needed for the simulation to be completed. For each layer, the axial dispersion coefficient is assumed to depend on the fluid properties in the same way. 4.1.2 Multilayer model The multilayer model allows the exchange of information between the adsorption bed model and the isotherm model, as can be seen in Figure 4.2. Also, the multilayer model lets the user choose the isotherm model intended to be used for the simulation. Although there are different isotherm models present in the gPROMS® library, only one isotherm can be applied for each simulation. It is not possible yet to employ different isotherms according to the adsorbent, for example. Figure 4.2 – Connections between isotherm model, adsorption bed model and multilayer model Different sections compose the multilayer model. A first section, where the connection with the variables provided by the adsorption bed is formulated, is followed by a section for each existing isotherm model. In the section corresponding to each isotherm model the connection between the variables used in both models takes place. The different isotherms models existing in gPROMS® libraries are defined by different equations and, each of it with different parameters. For this reason, each isotherm corresponds to a different model and all these isotherm models are connected to the multilayer model. Pressure Swing Adsorption for Hydrogen Purification Modelling and Simulation 19PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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