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heavy reflux stream. The feed concentration is 15% CO2 whereas the concentration in the heavy reflux stream is in the range 75 - 85% CO2. The progression of the concentration front can be tracked by observing the temperature rise peak in the temperature profile of all the thermocouple. It can be seen that the second peak only reaches until thermocouple T-4 which is 47.26% in the bed that means the front location is between 47.26% and 58.78% of the bed. However, the feed wave front reached until T-7 and a very small amount of CO2 broke through during this experiment. Using the equilibrium isotherms of individual component determined using micromeritics ASAP 2010 and mass transfer coefficients determined from the single gas cyclic experiment in RPSA setup, the model was able to predict accurately the temperature profiles and position of the higher concentration front during the heavy reflux step for the entire PSA cycle for E-1. The comparison of the experiment with simulation prediction of CO2 purity and CO2 recovery in the heavy product for all five runs are shown in Table 4.3. The results show a close agreement between experiments and model. The energy consumed for each run was calculated using equation (12) and summarized in Table 4.4. The effect on the energy consumed by the PSA process for change in the reflux ratio, CnD pressure and bed temperature were studied. Figure 4.7 shows the energy consumed (kJ/mol of CO2 removed) by the PSA unit cumulatively during the CnD step and the LR step for changing the light reflux ratio (γ). For each case the energy consumption was calculated for the compressor efficiency 80%. Figure 4.7 shows that the energy consumption increases by increasing γ. Operating at higher γ means more gas exit the LR step, which recycled back completely to the HR step. 32PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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