Coupling gas-assisted stripping and waste heat recovery for energy-efficient carbon capture processOA
A novel CO₂regeneration process was designed by coupling gas-assisted stripping to waste heat recovery(WHR)from the stripped gas,and this process was successfully implemented on a CO₂regeneration test rig.N₂was used as a model stripping gas to enhance CO₂ regeneration and introduced through one of two modes:into the bottom of the CO₂ stripper(the N₂-bubbling mode)or at the side of the stripper(the N₂-sweeping mode).Waste heat from the stripped gas,which was a mixture of H₂O(g)and noncondensable gas,was also recovered and re-introduced into the stripper using the cold CO₂-rich solvent bypassed from the main rich solvent stream.The experimental results verified that N₂-assisted stripping could reduce the reboiler duty by enhancing the driving force for CO₂ regeneration.Compared to the traditional thermal regeneration process,the reboiler duty could be reduced by 7.9% in the N₂-assisted stripping regeneration process.Furthermore,when waste heat of the stripped gas was recovered using a transport membrane condenser in the N₂-bubbling regeneration mode,the maximum reboiler duty saving could reach 26.8%.Such gas-assisted stripping is applicable in the WHR system to reduce energy consumption through dual pathways,namely upgraded driving force for CO₂ regeneration and improved WHR.In future work,a more suitable stripping gas should be developed to facilitate CO₂ separation from the stripped gas.
Te Tu;Tiezhou Wu;Xi Zhang;Feihong Liang;Long Ji;Shuiping Yan
Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan 430068,China College of Engineering,Huazhong Agricultural University,No.1,Shizishan Street,Hongshan District,Wuhan 430070,China Technology&Equipment Center for Carbon Neutrality in Agriculture,Huazhong Agricultural University,Wuhan 430070,ChinaHubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan 430068,ChinaPritzker School of Molecular Engineering,The University of Chicago,5640 S.Ellis Ave,Chicago,IL 60637,USACollege of Engineering,Huazhong Agricultural University,No.1,Shizishan Street,Hongshan District,Wuhan 430070,China Technology&Equipment Center for Carbon Neutrality in Agriculture,Huazhong Agricultural University,Wuhan 430070,ChinaCollege of Engineering,Huazhong Agricultural University,No.1,Shizishan Street,Hongshan District,Wuhan 430070,China Technology&Equipment Center for Carbon Neutrality in Agriculture,Huazhong Agricultural University,Wuhan 430070,ChinaCollege of Engineering,Huazhong Agricultural University,No.1,Shizishan Street,Hongshan District,Wuhan 430070,China Technology&Equipment Center for Carbon Neutrality in Agriculture,Huazhong Agricultural University,Wuhan 430070,China
资源环境
Chemical absorptionCO₂regenerationEnergy savingGas-assisted strippingTransport membrane condenser
《Green Carbon》 2026 (1)
P.3-11,9
financial support from the National Natural Science Foundation of China(Grant Nos.52376190 and 51676080)Natural Science Foundation of Hubei Province(Grant No.2025AFB088).
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