Process Simulations of CO2 Desorption in the Interaction between the Novel Direct Steam Stripping Process and Solvents
2017
Wang, Tao | He, Hui | Yu, Wei | Sharif, Zohaib | Fang, Mengxiang
Intensive energy consumption is one of the major challenges for large-scale implementation of amine-based CO₂ chemical absorption processes. The study of diverse typical solvents in a novel process can effectively exploit the potential of energy saving to the utmost. This work focuses on the optimization of a novel direct steam stripping process using three typical solvents, monoethanolamine (MEA), 2-amino-2-methyl-1-propanol (AMP), and piperazine (PZ). A rate-based model was established to investigate the regeneration process. The direct steam stripping process exhibits 20–30% reduction in energy penalty for different solvents. Detailed information on the concentration and pressure profiles along the stripping column was presented in the direct steam stripping process. There is a strong flash process at the top of the column, which results in an enormous reduction of the latent heat. Therefore, using MEA as the absorbent shows the best performance on reducing energy penalty as a result of its best property of vapor–liquid equilibrium at high CO₂ loading. Capacity and size variations of absorber and heat exchangers were also analyzed to evaluate the influence on primary devices in the new process. The relatively lower CO₂ loading of the lean solvents can result in a significant decrease of the packing height of the absorber, which would achieve a 31% reduction in the packing height for AMP solvent, hence alleviating the high initial investment of the whole process.
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