2 research outputs found
Start-up Time and Load Range for the Methanation of Carbon Dioxide in a Fixed-Bed Recycle Reactor
Fluctuating wind and solar energy
can be used to produce hydrogen
by water electrolysis and subsequently for the synthetic natural gas
production via methanation in the power-to-gas process. This paper
investigates the unsteady-state operation of the methanation in an
adiabatic and cooled fixed-bed reactor, respectively, with product
recirculation by simulation of a one-dimensional fixed-bed reactor
model. The results show that adiabatic fixed-bed reactors with product
recirculation can operate in a wide range of partial and excess load.
The recirculation of product gas cools the adiabatic fixed-bed reactor
effectively and an optimal recycle ratio for the highest methane productivity
exists. Cooled reactors are very sensitive to load changes of the
volumetric flow rate and thus less flexible. However, the recycle
of product gas allows reducing the sensitivity for a more stable operation
under fluctuating feed conditions. The start-up time of cooled fixed-bed
reactors is considerably lower. In summary, the flexibility of the
dynamic methanation is enhanced in a loop-reactor arrangement