A study of nano-micro-bubble process for CO2 absorption in water for biogas upgrading application
Year: 2024
Type: article
Abstract: The work proposed a novel micro-bubble system using swirling jet flow method for improving the physical absorption of CO 2 in water. The effects of operating conditions; e.g. gas flow rate (from 500 to 2000 mL/min), inlet pressure (2 and 3.5 bar) and inlet CO 2 concentration (from 5 to 60 % v/v in CO 2 /N 2 gas mixture) on the physical absorption of CO 2 were studied. It was found that the CO 2 absorption system reached to steady state after 30 min with the outlet CO 2 concentrations of 2.9 % and 8.8 % at 40 % and 60 % of inlet CO 2 concentrations, respectively. These outlet CO 2 concentrations demonstrated the standard of bio-methane for replacing natural gas in vehicle use, from which <10 % CO 2 is required. Moreover, the increase of gas flow rate resulted in increase of outlet CO 2 concentration. The rising of inlet pressure from 2 to 3.5 bars let to reduction of the outlet CO 2 concentration together with enhancing the dissolved CO 2 concentration in water from 49.1 to 51.7 mg/L at gas flow rate of 2000 mL/min and 60 % of inlet CO 2 concentration. The highest efficiency of CO 2 removal was 98.41 % under gas flow rate at 500 mL/min with 60 % of inlet CO 2 concentration. Under the optimized conditions, this system was tested with real biogas as raw material containing mainly 57.7 % of CH 4 and 40.3 % of CO 2 which achieved to remove the 95.1 % of CO 2 removal and no significant loss of CH 4 . This highlight demonstrated the potential application of this technology for biogas upgrading or purification further.
Source: Results in Engineering
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,490
OpenAlex ID: W4404062096