Abstract
This paper presented a comparative study of monoethanolamine (MEA) and diethanolamine (DEA) for post-combustion CO2 capture (PCC) process with different process configurations to study the interaction effect between solvent and process. The steady state process model of the conventional MEA-based PCC process was developed in Pro/II® and was validated with the experimental data. Then ten different process configurations were simulated for both MEA and DEA. Their performances in energy consumption were compared in terms of reboiler duty and total equivalent work. The results show that DEA generally has better thermal performances than MEA for all these ten process configurations. Seven process configurations provide 0.38%–4.61% total energy saving compared with the conventional PCC process for MEA, and other two configurations are not favourable. For DEA, except one configuration, other process configurations have 0.27%–4.50% total energy saving. This work also analyzed the sensitivities of three key parameters (amine concentration, stripper pressure and lean solvent loading) in conventional process and five process modifications to show optimization strategy.
Highlights
Carbon capture and storage (CCS) technology is considered to be the most effective technology to reduce greenhouse gas emissions in the future
This paper presented a comparative study of monoethanolamine (MEA) and diethanolamine (DEA) for postcombustion CO2 capture (PCC) process with different process configurations to study the interaction effect between solvent and process
Compared with Lean vapour compression (LVC) is more favourable to MEA, it can be concluded that Rich solvent split (RSS) or the variant of RSS are more efficient to DEA, because CO2 is easier released from DEA solution in thermodynamics
Summary
Carbon capture and storage (CCS) technology is considered to be the most effective technology to reduce greenhouse gas emissions in the future. The application of CCS technology is limited by high energy consumption and high cost of capture process. High energy requirement for stripping still exists due to the high heat of reaction with CO2 using MEA (around 85 kJ/mol CO2). Like DEA, are much less reactive to sulphur components and their reaction products are not corrosive. Most studies only evaluate process configurations for MEA solvent and the interaction between solvent and process is ignored (Le Moullec et al 2014). It is worth investigating the energy consumption of different amine solvents in different process. For the further study and discussion, a detailed analysis is presented to study the effect of some significant parameters in capture process and the total energy consumptions of each condition are evaluated and compared
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