Elimination Of Siloxanes By Adsorption Process
As A Way Of Upgrading Biogas
Author(s)
D. Ricaurte Ortega & A. Subrenat
Abstract
Biogas is increasingly being investigated as a source of renewable energy,
however its utilisation requires an improvement of its quality. Certain biogases
contain compounds called siloxanes; these compounds are the origin of some
problems when using biogas. At high temperatures siloxanes are transformed to
silicate oxides which can damage equipment (i.e. engines corrosion, the clogging
of fuel cell membranes.). This paper provides details of the research done in the
treatment of siloxane by adsorption process of adsorption. Different porous
materials were studied in order to evaluate adsorption capacities. Influences of
humidity and temperature on the mass transfer were evaluated. Moreover,
reactors were filled with a mixture of methane and carbon dioxide (principal
compounds on the biogas) in order to evaluate the impact of the gas composition
in the adsorption capacities. Finally the capacity of adsorption is also evaluated
in the presence of an organic volatile compound (VOC). Activated carbon cloth
was chosen to continue with the experiences realised for the adsorption –
desorption process. This porous material has shown good adsorption capacities.
Furthermore, desorption process can be performed in situ and their
implementation in industrial process is more easy. Adsorption-desorption cycles
were performed and the possibilities of the material regeneration evaluated. Joule
effect was employed in the desorption process in order to reduce the duration of
regeneration. First cycles have been accomplished. Results are promising, even if
the operational conditions of the process must be optimised.
Keywords: siloxanes, biogas, adsorption, desorption, activated carbon cloth,
zeolite, Joule effect.
Keywords
siloxanes, biogas, adsorption, desorption, activated carbon cloth,
zeolite, Joule effect
Related Book
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