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When considering a process with a multilayer adsorption bed, the number of parameters being considered for the isotherm changes. While in a column filled with one layer of adsorbent the parameters of the isotherm are the same throughout the entire column, in a multilayer adsorption bed these parameters have different values for each different layer present. Also, the heat of adsorption undergoes a different distribution domain. In a one layer column the heat of adsorption for each component is constant for the whole process. In a multilayer process this variable varies according to the layer of adsorbent and, for this reason, the distribution of this variable as an array of components needs to be altered to a variable with a distribution in the components and the number of layers. A relation between the variables being exchanged between models is needed so that the values of those are correctly used for the respective models. When a column is composed for a single layer of adsorbent equality between the variables in the dimension z is sufficient for the correct linkage of these values. However, this relation is no longer valid when the column in the process is composed by layers of different adsorbents. Table 4.1 - Connection between equal variables present in the multilayer and isotherm models Connection between bed and multilayer models for one layer column For a multilayer process these variables are calculated separately for each layer preventing the use of the relation above. A relation between these variables and the layers of the column is then of extreme importance to assure that the exchange between models is correctly done and, also that the variables are being calculated for the right layer of the column. Therefore, a variable that relates the length of the column with the layers needs to be introduced in order to ease the implementation and calculation of the variables being sent to bed in the different layers of adsorbent. This variable corresponds to an array of the number of layers + 1. This variable provides the correct use of the parameters for the calculation of the variables in the isotherm model in each layer, despite the number of layers that compose the adsorbing bed. With the introduction of this new variable a connection between the first point of the column is calculated in a FOR DO cycle and in a second FOR DO cycle the remaining calculations are Modelling and Simulation 20 Pressure Swing Adsorption for Hydrogen Purification Forz=0 to1 qeq = isotherm. qeq heat od adsorption = isotherm. heat of adsorptionPDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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