SNG production from gasified biomass, electrolytic H2 and captured CO2

The concept for a flexible gasification methanation plant is described in this work. A fixed bed reactor is combined with an electrolysis and a CO₂ storage. In the electrolysis, hydrogen is produced from renewable electricity. Depending on electricity prices, different modes of operation are possible to create synthetic natural gas. For a catalytic methanation reactor, a CFD model is developed including the choice of a suiting kinetic model and a realistic description of the porous catalyst. Validation experiments are carried out at a test rig for different feed gas compositions. The results of the simulations for the methane content are within the error bars for the experimental results.The derived CFD model is valid for a flexible methanation reactor for CO and CO₂ methanation.