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It should also be noted that the simulations performed were not optimized for the maximum removal of CO2. In the simulations only one bed with two heaters was examined, however to increase the amount of CO2 removed from the feed stream Mulloth et al.5 show that a minimum of two TSA beds in series would be needed. In our simulations, the CO2 desorbed was swept out of the bed within the first minute of the adsorption half-cycle. However, with a second bed the mass of CO2 would ideally be captured and pressurized in the second TSA bed, thereby minimizing the amount of CO2 that reenters the feed stream. 3.4 Conclusions Mathematical models were formulated using material and energy balances pre- viously developed by Sward et al.7 and Walton and LeVan10 and solved numerically in order to examine the influence that temperature gradients within the bed have on TSA compression efficiency. The models were solved for both a desorption and adsorption-half cycle of CO2 on 5A zeolite. Several cases were examined in which the allocation of the energy supplied to the adsorbent bed was varied between two heaters ranging from an essentially uniform heating case to only one heater supplying the energy. Alternating adsorption and desorption half-cycles were simulated until a periodic state was reached at which point a comparison of the regeneration efficiencies was made for all of the simulations. We determined that for the scale of the system and the materials considered, the value of the effective thermal conductivity of the bed has a significant impact on performance. By altering the geometry of the adsorbent bed, the effective thermal conductivity was doubled and the regeneration efficiency was increased by nearly 55%. Also, the case in which both of the heaters supply equal amounts of energy to the adsorbent bed has the highest regeneration efficiency, as would be expected. With imbalanced heating loads, as would occur with a system malfunction, 44PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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