The feasibility of employing a moving-bed
adsorption (MBA) process as a postcombustion carbon capture process
was investigated using zeolite 13X as the adsorbent. The MBA process
consists of an adsorption bed and two desorption beds, which are operated
under different temperatures and pressures. Adsorbent particles circulate
around the beds in a countercurrent direction to the gas flow in each
bed. A high-efficiency heat integration scheme that recovers the heat
of adsorption and reuses this energy as the heat of desorption was
designed and implemented to minimize the energy requirements. A fixed-bed
dehydration unit using MIL-101 (Cr) as the adsorbent was also designed
for pretreatment of the flue gas and was incorporated as an integral
part of the process. Models were established for predicting the operating
energy for constituent process units from the dehydration to liquefaction
stages, and the minimum energy requirement was calculated. The results
indicated that the total energy demand per unit amount of CO2 removal in terms of the equivalent work was intermediate to those
of the optimized piperazine- and monoethanolamine-based absorption
processes. The regeneration energy, which accounts for only the capture
process, except for the dehydration and liquefaction processes, was
estimated to be less than half of those of the absorption processes.
The sensitivity of the process performance to the CO2 selectivity
and sorption capacity was also analyzed to investigate the potential
improvement in the performance of the MBA process when using more
efficient adsorbents.
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