摘要
The usage of capillary tubes for CO_(2) absorption suffers from small re sidence time,which leads to reduced performance for large throughput.This work presents a method of connecting expansion units to capillary tubes to serve as a residence time delayer.The effect of the expansion unit on gas-liquid hydrodynamics,pressure drop and mass transfer coefficient(k_(L)a) are investigated under various operating pressures up to 4.0 MPa,for both physical and chemical absorption.A novel periodic jetting flow is found in the expansion unit,which can intensify the CO_(2) absorption.Experimental results show that the strategy can significantly decrease the pressure drop while maintaining the absorption performance to a large extent.The overall k_(L)a for physical and chemical absorption are correlated to pressure drop,respectively.Besides,CO_(2) loading in rich absorbents increases dramatically compared to literature studies with only micromixers or capillary tubes,which is bene ficial to regenerate solvent.The study verifies the concept that pre-treatment with water can largely reduce the usage of amine s,and can also provide a guide for process design in natural gas purification such as biogas recovery.
基金
financial supports for this project from National Natural Science Foundation of China (No.21676263, U1608221)
the CAS supports of the Youth Innovation Promotion Association CAS (No. 2017229)
DICP (DICP I201925)。
