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velocities. The revised product purities and recoveries are competitive with the relevant studies in the literature, although the gas recovery from the desorption sink is not considered. The CO2-specific energy requirement for the present concept is found to be better than that of the bed-based TSA processes as shown in Figure 3.11(c). For better economic viability, the lower right corner of Figure 3.11(c) is desired, which indicates higher gas removal capacities with low energy requirements. The baseline case with 100 kPa is expected to yield higher process capacity, but at the expense of higher energy penalty. However, the performance predicted for the low pressure drop cases (25 kPa and 10 kPa) is in a competitive operating cost region. Thus, the reduction in pressure drop across the microchannel significantly increases the energy effectiveness of the present concept. The energy requirement for the present concept is not only lower than that of bed-based TSA systems, but also smaller than commonly used MEA absorption systems. At reduced pressure drop values, the process performance is better than that of the TSA process reported by Pahinkar et al. (2016). The present concept yields a better performance when compared with the bed- based PSA process studied by Krishnamurthy et al. (2014) for which the energy requirement is marginally lower; however, the process capacity is smaller by at least an order of magnitude than that estimated for the present concept. The present concept yields at least an order of magnitude greater CO2 removal capacity than bed-based PSA and TSA processes at similar or competitive operating costs. 91PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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