Techno-economic and environmental survey of an industrial gasification and methanation plant for the production of synthetic methane from tyre crumb
Résumé
A new potential industrial pathway to valorise rubber from worn tyres into synthetic
methane is assessed via a techno-economic and environmental analysis. In this process, tyre crumb
is firstly gasified in an Entrained Flow Reactor (EFR), which produces syngas that is further
adjusted to a H$_2$/CO ratio of 3, cleaned and finally reacted in a methanation reactor to produce
synthetic methane. An industrial-scale gasifier (2.5 t/h) was modelled and all other elementary steps
of the plant scaled accordingly. Two different pathways were considered: the first one, whereby
the syngas adjustment is conducted by a Water Gas Shift (WGS) reactor, and a second one in which
H$_2$ produced by an electrolyser is added to the gas stream. Both pathways were shown to have a
similar global energy yield, whilst the electrified process demonstrated a significant improvement
of carbon use (89 % vs. 35 %). The specific CO$_2$ content of the synthetic methane reached 400
kg/MWh$_{LHV}$ and 227 kg/MWh$_{LHV}$ for the pathway with WGS and the electrolyser, respectively.
Finally the Levelised Cost Of methane (LCO$_{CH4}$) was estimated to be equal to 105 €/MWh synthetic fuel, waste valorisation, electrolysis, carbon assessment for the pathway with WGS and 18€/MWh$_{HHV}$ for the pathway with the electrolyser.
Domaines
Génie des procédésOrigine | Fichiers produits par l'(les) auteur(s) |
---|