Abstract
Ultrasound and vacuum were respectively employed to enhance CO2 desorption in a water scrubbing biogas upgrading system. Results showed that incomplete CO2 desorption could cause a high CO2 content in the water and seriously affect the purity of the product gas. Vacuum had a strong enhancement effect on CO2 desorption. When a vacuum of 0.04 MPa was used to enhance CO2 desorption, the amount of the stripping air could be reduced to 1/16-th of that without enhancement, indicating that vacuum could greatly enhance CO2 desorption and significantly decrease the amount of the stripping air, which was expected to reduce a large amount of energy consumption. In contrast, the enhancement effect of ultrasound was not so obvious for CO2 desorption in the desorption column with air stripping, since the solution could be well desorbed by gas stripping, though ultrasound could strongly affect the static CO2 desorption.
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Abbreviations
- Cfeed :
-
CO2 concentration of the feed water [mg/kg]
- Cout :
-
CO2 concentration of the out water [mg/kg]
- Cout-eq :
-
equilibrium CO2 concentration of the out water [mg/kg]
- H:
-
Henry’s constant [kPa]
- pHfeed :
-
pH value of the feed water
- pHout :
-
pH value of the out water
- pHsol :
-
pH value of the aqueous solution
- Pabs :
-
operating pressure of the absorption column [kPa]
- PCO2 :
-
actual partial pressure of CO2 [kPa]
- PCO2-eq :
-
equilibrium partial pressure of CO2 [kPa]
- Rair :
-
air stripping rate [mL/min]
- Rdes :
-
desorption rate of CO2 [mL/g/min]
- Vdes :
-
desorption amount of CO2 [mL/g]
- Yprod :
-
CO2 concentration in the gas product [vol%]
- Yprod-eq :
-
equilibrium CO2 concentration in the gas product [vol%]
- Yprod-min :
-
limit minimum CO2 concentration in the gas product [vol%]
- Xfeed :
-
mole fraction of CO2 in the feed water [mol%]
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Acknowledgements
This study was funded by National Key Research and Development Program of China (2018YFE0106400), Youth Science and Technology Innovation Team of Shandong Colleges and Universities (2019KJD002), Jinan Science and Technology Plan (201913013) and major program of Shandong Innovation Center of Bioengineering Technology (2019JSWGCCXZX002).
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Jin, F., Xu, H., Hua, D. et al. Enhancement of CO2 desorption using ultrasound and vacuum in water scrubbing biogas upgrading system. Korean J. Chem. Eng. 38, 129–134 (2021). https://doi.org/10.1007/s11814-020-0686-z
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DOI: https://doi.org/10.1007/s11814-020-0686-z