Device and method for producing substitute natural gas and network comprising same

Integrated device for producing a substitute natural gas, comprising:

• a gasifier configured to produce a gaseous compound from a biomass, comprising:
• an inlet for the biomass;
• an inlet for an oxidizing agent;
• and
• an outlet for the gaseous compound comprising carbon monoxide;
• a carbon monoxide methanation unit to methanate the carbon monoxide to produce substitute natural gas from the gaseous compound output from the gasifier, the first methanation unit comprises at least one inlet for water and an inlet for the gaseous compound coming from the gasifier;
• a carbon dioxide methanation unit to produce substitute natural gas comprising at least one inlet for the water and an inlet for the carbon dioxide coming from the carbon monoxide methanation unit;
• an electrolysis unit to produce from the water and an electric current, comprising:
• an electrical power supply;
• an inlet for the water;
• and
• an outlet for dihydrogen supplying the carbon dioxide methanation unit.

A network comprising at least one integrated device for producing substitute natural gas, said at least one integrated device comprising:

• a gasifier configured to produce a gaseous compound from a biomass, comprising:
• an inlet for biomass;
• an inlet for an oxidizing agent;
• and
• an outlet for the gaseous compound comprising carbon monoxide;
• a carbon monoxide methanation unit to methanate the carbon monoxide to produce substitute natural gas from the gaseous compound output from the gasifier, the carbon monoxide methanation unit comprises at least one inlet for water and an inlet for the gaseous compound coming from the gasifier;
• a carbon dioxide methanation unit to produce substitute natural gas comprising at least one inlet for water and an inlet for the carbon dioxide coming from the carbon monoxide methanation unit;
• an electrolysis unit to produce from water and electric current, comprising:
• an electrical power supply;
• an inlet for water;
• and
• an outlet for dihydrogen supplying the carbon dioxide methanation unit.

Method for producing a substitute natural gas, comprising:

• producing a gaseous compound from a biomass, comprising the steps of:
• inputting the biomass;
• inputting an oxidizing agent;
• and
• outputting the gaseous compound comprising carbon monoxide from a gasifier;
• methanating the carbon monoxide to produce the substitute natural gas from the gaseous compound and comprising at least one step of inputting water and the step of inputting the gaseous compound from the gasifier;
• methanating the carbon dioxide to produce the substitute natural gas comprising at least one step for inputting the water and the step of inputting the carbon dioxide from the carbon monoxide methanation step;
• producing dihydrogen from the water and an electric current, comprising the steps of:
• supplying an electrical power;
• inputting the water;
• and
• outputting dihydrogen used during the carbon dioxide methanation step.