Chunfei Wu

Chunfei Wu

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CO2 absorption - solvent - Amine-based - Mechanisms and properties, energy performance, and solvent stability - Energy performance

Influence of liquid gas ratio on regeneration heat

https://doi.org/10.3390/en12132504

“The liquid:gas ratio is an important parameter for the absorption effect of the absorption process and the energy consumption required for the desorption process. It is generally believed that the absorption effect is better when the liquid:gas ratio is larger, but at the same time, the energy consumption of the solution regeneration process will increase. It is extremely important to select a reasonable liquid:gas ratio for the carbon capture process. Figure 6 and Figure 7 show the effect of L/G for the thermodynamic cycle and equilibrium model. L/G varies from 2.2 to 3, and both thermodynamic cycle and equilibrium model show a similar trend. Qsens and Qvap increase lightly and Qabs decreases, then the best L/G is in the actual carbon capture process. The value ranges from 2.84 to 2.82 GJ/t, and then it stars to increase up to 2.88 GJ/t when L/G varies from 2.2 to 3. The difference is greater in the equilibrium model, which ranges from 4.15 to 3.99 GJ/t, and then to 4.22 GJ/t.

Energies 12 02504 g006 550
Figure 6. The regeneration heat changes with L/G value variation.
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Figure 7. The energy efficiency performance with L/G value variation.
The effect to Wmin, COPCO2, and η2nd is acting on the change of the capture ratio. With the increase of L/G, the capture ratio should be higher, then causes the Wmin to increase, which increases from 150.0 to 172.2 kJ/kg. The COPCO2, however, representing the energy conversion efficiency, decreases from 2.54 to 2.40 and means it is harder for work or heat transformation to the chemical energy of CO2 with the CO2 removal ratio increasing. In another point, η2nd rises from 23.4% to 26.4% with Wmin increasing, which means the room for improvement of the energy performance of the cycle becomes less. There is another factor that should be taken into account, which is that the L/G increase will bring extra pump work and needs an increase in some degree in the actual situation, which is also bad for a hole capture system.”

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