Application of microbubble technique for CO2 and CH4 entrapment in biogas

Songphon Suekkhachat; Somchai Saeung; Chayut Nuntadusit

Authors

Songphon Suekkhachat Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla 90110, Thailand
Somchai Saeung Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla 90110, Thailand
Chayut Nuntadusit Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hatyai, Songkhla 90110, Thailand

Keywords:

biogas, CH4, CO2, microbubble, microbubble generator, microbubble technique, water scrubber

Abstract

Biogas has been found as the alternative renewable resource to replace fossil fuels, which contains 53-70% of CH₄, 30-50% of CO₂ and other gases. Water scrubber is the most popular technique for biogas cleaning due to economic and also high purification output. This research aimed to investigate biogas upgrading by using microbubble that generated from a developed swirl nozzle. The water flow rates were controlled of 10, 15, 20, 25, 30 and 35 litre/min. The bubble varied in the range of 50.44-116.04 µm for entire experiment. CO₂ removal from pilot scale by entrapping CO₂ reached 83.06%, and CH₄was recovered to 96.26% at conditions of 35 litre/min of water, 0.1 litre/min of constant gas flow rate. Finally, flow characteristics form simulation result inside reactor including with nozzle part were discussed to understand flow phenomena.

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