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As a result, this work proposes a comparative study on CO 2 capture process configurations between MEA and DEA, which is aiming to compare the thermal performances between MEA and DEA, as well as investigating the energy saving by different process configurations using MEA and DEA. Therefore, it is worth investigating the energy consumption of different amine solvents in different process. However, most studies only evaluate process configurations for MEA solvent and the interaction between solvent and process is ignored (Le Moullec et al. However, A disadvantage of DEA is that it exhibits slow kinetics (Kohl and Nielsen 1997 Carson et al. These all make DEA to be an attractive option for CO 2 capture. Secondary amines, like DEA, are much less reactive to sulphur components and their reaction products are not particularly corrosive. Consequently, DEA could be taken into account for low pressure operations and it has a lower heat of reaction with CO 2 (around 70 kJ/mol CO 2). Nevertheless, high energy requirement for stripping still exists due to the high heat of reaction with CO 2 using MEA (around 85 kJ/mol CO 2). At present, MEA is still considered to be the main solvent in aqueous alkanolamine based capture processes because of its high absorption rate and low solvent cost as well as low regeneration heat requirement (Aaron and Tsouris 2005). 2013), piperazine (heterocyclic amine, PZ) (Li et al. 2013), methyldiethanoamine (tertiary amine, MDEA) (Zhang and Chen 2010) and aminomethylpropanol (sterically hindered primary amine, AMP) (Li et al. Many kinds of amine have been studied in CO 2 capture process, such as monoethanolamine (primary amine, MEA), diethanoamine (secondary amine, DEA) (Diab et al. Many studies are found in the literature that discuss the two main paths to reduce energy consumption in CO 2 capture process, developing new solvents and optimization of the process configurations (Oyenekan and Rochelle 2007 Aroonwilas and Veawab 2007 Le Moullec and Kanniche 2011a Cousins et al. Post-combustion CO 2 capture (PCC) technology is widely studied now because it can be applied to most fossil fuel power plants, and among all kinds of PCC technology, chemical absorption with amine solutions is the most reliable and efficient method of CO 2 capture. Obviously, the application of CCS technology is limited by high energy consumption and high cost of capture process.
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The cost of CCS technology applied in fossil fuel power plant is about 40 to 60 $/t CO 2 (Barry 2001), and the electricity price will increase by 45% when coupled with CCS (Le Moullec and Kanniche 2011b). 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.Ĭarbon capture and storage (CCS) technology is considered to be the most effective technology to reduce greenhouse gas emissions in the future.
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For DEA, except one configuration, other process configurations have 0.27%–4.50% total energy saving. 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. The results show that DEA generally has better thermal performances than MEA for all these ten process configurations. Their performances in energy consumption were compared in terms of reboiler duty and total equivalent work. Then ten different process configurations were simulated for both MEA and DEA.
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The steady state process model of the conventional MEA-based PCC process was developed in Pro/II ® and was validated with the experimental data. This paper presented a comparative study of monoethanolamine (MEA) and diethanolamine (DEA) for post-combustion CO 2 capture (PCC) process with different process configurations to study the interaction effect between solvent and process.