Steady and Dynamic State Simulation-based Study of the Coupling of Electrolysis and Methanation Processes within Power to Methane (PtM) Context

Abstract

Through electrolysis and methanation coupling, Power to Methane systems have raised as an attractive alternative for power generation while harnessing renewable sources’ potential and reducing carbon dioxide (CO2) emissions. However, there is a research scarcity in their coupling within a Power to Methane context. This study simulates and analyzes an alkaline electrolysis cell coupled to a methanation process in a Power to Methane context to produce electricity by an open Brayton cycle in both steady and dynamic state. Simulation software is used to analyze the operating conditions and specifications’ effects, the effect of the electrolysis power input in a steady-state simulation, and the behavior of a dynamic-simulation with fluctuating renewable energy input for the electrolysis process in two different plant arrangements. Results provide a preliminary glance at the Power to Methane system's behavior finding its contribution to the continuity issues that renewable energy sources have. However, the importance of continuing the research is highlighted to deeply understand the coupling of these processes in order to improve the profitability and performance of a PtM system. © 2021 Elsevier B.V.