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A thermodynamic design and comprehensive assessment of absorber intercooled and recycled solvent strategies to improve process yield of MEA-based CO2 capture
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OA
AI
王
张
S
J
B
DOI：10.3389/fenrg.2026.1828509.png)
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Abstract
En 中文
Chemical absorption using aqueous monoethanolamine (MEA) remains one of the most practical approaches for post-combustion CO2 capture (PCC); although its deployment is still limited by the high energy demand of solvent regeneration. In this study; absorber-side process-intensification strategies were assessed using a validated rate-based Aspen Plus model in order to improve solvent utilization and reduce plant-wide energy penalty. Three configurations were evaluated within the same modeling framework: absorber intercooling (AI); rich liquid absorbent recycle (RLAR); and the combined AI + RLAR configuration. Unlike previous studies that usually examine these modifications separately or emphasize stripper-side changes; the present work provides a comparative absorber-focused assessment and translates the parametric results into practical design guidelines for intercooling location; intercooling temperature; and recycle split ratio. The base model agreed well with published experimental data; with an RMSD of 0.63 K for the absorber liquid-temperature profile. Sensitivity analysis showed that AI + RLAR lowered the absorber liquid peak temperature from 324.31 K to 319.65 K and increased capture efficiency from 99.3% to 99.6%. Increasing the lean-solvent MEA mole fraction reduced equivalent work (Weq); with AI; RLAR; and AI + RLAR achieving reductions of 5.92%; 8.88%; and 10.86%; respectively; while the combined configuration also reduced reboiler duty (Qreb) by up to about 3%. The results further indicate that intercooling is most effective when applied at lower absorber stages and lower temperatures; whereas a moderate recycle split ratio provides the best trade-off between energy savings and the increase in internal solvent circulation.
Keywords:
CCUS
process optimization
equivalent work
intercooling
reboiler duty
rich split
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