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𝜀𝑏𝑒𝑑𝐷𝑎𝑥 = 20 + 0.5𝑆𝑐𝑅𝑒 𝐷𝑚 (4.1) Pressure Swing Adsorption for Hydrogen Purification Figure 4.1 – Adsorption bed layout on the left and dialog box on the right 4.1.1 Axial dispersion model As it was mentioned in the previous chapter, the axial dispersion coefficient could be either calculated through a correlation already included in gPROMS® or it could be calculated through any other correlation preferred by the user through the custom dispersion model. The original dispersion model calculates the axial dispersion coefficient for each component by means of the correlation suggested by Edwards and Richardson. Nevertheless, a correlation involving a fewer number of equations was suggested in the literature presented in the chapter 2 of this work. The correlation proposed by Wakao and Funazkri (1978), characterized by equation (4.1) was then incorporated in gPROMS® libraries replacing the original dispersion correlation. As the original dispersion model, the one employing the Wakao and Funazkri correlation allows to calculate the axial dispersion coefficients for every component of the feed mixture, being the diffusivities the only parameter required. The other variables are calculated through variables from the adsorption bed. The Wakao and Funazkri correlation requires a Modelling and Simulation 18PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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