Simultaneous removal of carbon dioxide and hydrogen sulfide in a single packed column system

Name: Viset Lailuck

Organization : National Metal and Materials Technology Center

Name: Somsak Supasitmongkol

Organization : National Metal and Materials Technology Center

Email : somsaks@mtec.or.th

LCSH: Carbon dioxide mitigation

LCSH: Hydrogen sulfide

LCSH: Biogas

Abstract: Biogas derived from anaerobic digestion of biological wastes has been extensively used for heating purposes and/or electricity generation. Presence of carbon dioxide (CO2) and hydrogen sulfide (H2S) in biogas affects engine performance adversely. It is necessary for removal of acid gases in practical application before utilizing biogas. In this work, acid gases absorbed by water in a packed column was experimentally investigated to determine technical feasibility of a water scrubbing system designed for CO2 and H2S removal from a simulated gas stream (40 vol.% CO2, 0.25 vol.% H2S balanced in N2). Many factors affecting the behavior of gas absorption such as gas vane inlet, liquid-to-gas flow rate (L/G) ratios, packing height and absorbent solutions (e.g., water and aqueous sodium hydroxide (NaOH) solution) were considered. The behavior of flowing gas through the column was also undertaken using a computational fluid dynamic (CFD) analysis. The CFD simulations showed that the entrance direction of the gas in vane affects superficial velocity and pressure loss of the flowing gas momentum inside column. At the same superficial gas velocity, pressure loss was significantly less for the tangential gas inlet when compared with the perpendicular gas inlet. The tangential gas inlet showed a better H2S removal efficiency than the perpendicular inlet due to uniform gas flow distribution. The higher gas in-flow rate had negative impact to contacting efficiency and mass transfer of liquid and gas phase. The absorption column using water absorbent was found to get the highest H2S removal efficiency up to 80%. The aqueous NaOH solution used was observed to simultaneously remove high proportion of CO2 and H2S (over 98% removal efficiency). The breakthrough time increases significantly with increasing concentration of a NaOH solution.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2016

Modified: 2019-10-25

Issued: 2019-10-25

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BibliograpyCitation : In Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn and Chulalongkorn University Faculty of science. Pure and Applied Chemistry International Conference (PACCON 2016) (pp.294-298). Bangkok : Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn

eng

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