Methanation process and reactor for reacting hydrogen with at least one carbon-based compound and producing methane and water

A methanation method for reacting dihydrogen with at least one of carbon monoxide and carbon dioxide in a gaseous form and producing a methane, comprising the steps of:

• providing inside a hollow body of methanation reactor a fluidized bed of catalytic particles;
• injecting a liquid-phase cooling water into a first location of said fluidized bed for mixing the liquid-phase cooling water with the catalytic particles such that the liquid-phase cooling water vaporizes on contact with the fluidized bed in said first location, absorbing thereby phase-change latent heat;
• inputting said at least one of carbon monoxide and carbon dioxide and dihydrogen into a second location inside said fluidized bed, said second location having said vaporized cooling water allowing thereby methanation reaction between said at least one of carbon monoxide and carbon dioxide and hydrogen;
• and
• outputting the methane and water produced from the methanation reaction;
• wherein said second location is distanced from said first location such that temperature of said at least one of carbon monoxide and carbon dioxide in said second location is configured to minimize coke deposit formation and while cooling the methanation reaction.