Abstract
There are growing concerns that carbon dioxide (CO2) emissions are contributing to global climate change. CO2 capture and sequestration system is an effective way to alleviate this phenomenon. Chemical absorption of CO2 is a mature and efficient way to capture CO2 from industrial flue gas. Amines are the most commonly discussed solvent, such as NH3 as inorganic solvent and monoethanolamine (MEA) as the typical alkanolamine. MEA aqueous solutions have been widely analyzed and achieved good performance. However, the energy cost for the amine regeneration remains great which barricades its widely industrial application. Several energy efficient absorbents are currently discussed from the perspective of the reaction kinetics, desorption efficiency and sensible heat consumption. These discussions show that the absorbents with higher reaction rate and mass transfer coefficient and advanced process can reduce the sensible heat (less consumption of absorbent) and reaction heat, which thus make them as the energy efficient absorbents.
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Abbreviations
- C :
-
Concentration of the amine, kmol/m3
- D, D m :
-
Diffusion coefficient, m2/s
- G :
-
Inert gas flow rate, kmol/m2/s
- H :
-
Henry’s constant, MPa m3/kmol
- H S :
-
Henry’s constant of the solvent, MPa m3/kmol
- h :
-
Van Krevelen coefficient, m3/kmol
- I :
-
Ionic strength of the solution, kmol/m3
- k :
-
Reaction rate constant, m3/kmol/s
- k m :
-
Reaction kinetics, dimensionless
- K G a V :
-
Overall mass transfer coefficient, kmol/m2/s/MPa
- MSN :
-
Molecular synergy number, dimensionless
- P :
-
Operating pressure, MPa
- Re :
-
Reynolds number, dimensionless
- R:
-
Gas constant, 8.314 J/mol/K
- T :
-
Temperature, K
- t :
-
Time, s
- yA,G :
-
Gas phase concentration, mol/mol
- YA,G :
-
Mole ratio value
- Z:
-
Column height, m
- \(\upalpha\) :
-
Conversion rate, dimensionless
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Acknowledgments
Financial support of National Natural Science Foundation of China (no. 51276141) is gratefully acknowledged. This work is also supported by the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2015JQ5192) and “Fundamental Research Funds for the Central Universities”.
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Yu, Y.S., Zhang, T.T., Zhang, Z.X. (2017). Energy Efficient Absorbents for Industry Promising Carbon Dioxide Capture. In: Budzianowski, W. (eds) Energy Efficient Solvents for CO2 Capture by Gas-Liquid Absorption. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-47262-1_10
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DOI: https://doi.org/10.1007/978-3-319-47262-1_10
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