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Table 3.1 – Coefficients for the different types of mass transfer Pressure Swing Adsorption for Hydrogen Purification Mass transfer type Constant Bulk Knudsen Custom 3.2.6 Fluid properties nT nP 0 0 1.81 -1 0.5 0 - - The physical properties of the fluid are calculated through relations for density, thermal conductivity, viscosity, enthalpy and pure component molar enthalpy. In the template “fluid properties” calls to a Physical Properties package implemented as gPROMS Foreign Object are made. This model can be customized by the user implementing custom correlations for physical properties or modify the names of the Foreign Object physical properties calls to conform to other types of physical property packages. gPROMS® contains a physical properties package named Multiflash that supports all commonly-used thermodynamic and transport properties, including a wide range of equation and state activity coefficient thermodynamic models. Multiflash is specifically designed for equation-orientated modelling, providing tight convergence of internal iterations and analytical partial derivatives with respect to temperature, pressure and composition. 3.2.7 Dispersion model The dispersion model is used to calculate the axial dispersion coefficient from the component diffusivities and the fluid condition at each point in the bed. However, this model can be customised by the user and the correlation used can be also modified. gPROMS® also provides the option of using a constant axial dispersion coefficient. When this option is considered, the user introduces the desired value for this coefficient in the dialog box concerning the mass transfer and then, this value is constant through the entire adsorption column. 3.2.8 Isotherms The isotherms are used by the model to predict the amount of material that is adsorbed for each component when the gas phase and the surface are in equilibrium. In gML library there are four options available to specify the adsorption for a multicomponent mixture: Modelling Tool and Mathematical Model 15PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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