Significance of methanation reactor dynamics on the annual efficiency of power-to-gas -system
Inkeri, Eero; Tynjälä, Tero; Karjunen, Hannu (2020-09-10)
Post-print / Final draft
School of Energy Systems
The downstream processes of PtG should be capable to follow the dynamics and utilize the produced hydrogen, avoiding curtailment. This could be done with a very dynamic reactor system, or with aid of buffer storages for feed gases.
This paper studies the effect of dynamic properties of methanation reactor, hydrogen buffer storage and electrolyser full load hours on PtG system efficiency. The operation of electrolyser is following intermittent renewable electricity production and electricity markets, leading to varying full load hours (FLH) with different characteristics.
Enhancement of single parameters related to thermal dynamics of the reactor could improve the system efficiency more than parameters related to the loading of the reactor. Coupled threshold were found for FLH and H2 storage size, after which average efficiencies became nearly similar as in steady-state operation.
Inkeri, E., Tynjälä, T., Karjunen, H. (2021). Significance of methanation reactor dynamics on the annual efficiency of power-to-gas -system. Renewable Energy, vol. 163. pp. 1113-1126. DOI: 10.1016/j.renene.2020.09.029
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