System and process for producing synthetic fuels without emitting carbon dioxide

A plant (10) for the production of synthetic fuels, in particular jet turbine fuel (kerosene), crude petrol and/or diesel, comprising:

• a) a synthesis gas production unit (12) for the production of a raw synthesis gas comprising carbon monoxide, hydrogen and carbon dioxide from methane, water and carbon dioxide, the synthesis gas production unit (12) having at least one reaction section in which methane, water and carbon dioxide react to form the raw synthesis gas, and at least one heat generation section in which the heat required for the reaction of methane and carbon dioxide to form the raw synthesis gas is generated by burning fuel to form flue gas, the reaction section having a feed line (14) for methane, a feed line (16) for water, at least one feed line (18) for carbon dioxide and a discharge line (20) for raw synthesis gas and the heat generation section having a feed line (22) for fuel, a feed line for oxygen-containing gas (24) and a discharge line (26) for flue gas,
• b) a separation unit (28) for separating carbon dioxide from the raw synthesis gas produced in the synthesis gas production unit (12), with a discharge line (30) for carbon dioxide and a discharge line (32) for synthesis gas,
• c) a Fischer-Tropsch unit (34) for the production of hydrocarbons by a Fischer-Tropsch process from the synthesis gas from which carbon dioxide has been separated in the separation unit (28), and
• d) a refining unit (36) for refining the hydrocarbons produced in the Fischer-Tropsch unit (34) into synthetic fuels,
• the plant (10) further comprising:
• e 1) a separation unit (38) for separating carbon dioxide from the flue gas discharged via the discharge line (26) for flue gas from the heat generation section of the synthesis gas production unit (12), the separation unit (28) having a discharge line (40) for carbon dioxide, the discharge line (40) for carbon dioxide of the separation unit (38) and the discharge line (30) for carbon dioxide of the separation unit (28) being either connected directly to one of the at least one feed lines (18) for carbon dioxide of the synthesis gas production unit (12) or the discharge line (40) for carbon dioxide of the separation unit (38) and the discharge line (30) for carbon dioxide of the separation unit (28) being connected to a carbon dioxide compression unit (42) which has a discharge line connected to one of the at least one feed lines (18) for carbon dioxide of the synthesis gas production unit (12),
• and/or
• e 2) a flue gas return line connected to the flue gas discharge line (26) of the synthesis gas production unit (12), the flue gas return line and the carbon dioxide discharge line (30) of the separation unit (28) being connected either directly to one of the at least one carbon dioxide feed lines (18) of the synthesis gas production unit (12) or the flue gas return line and the discharge line (30) for carbon dioxide of the separation unit (28) being connected to a carbon dioxide compression unit (42), which has a discharge line that is connected to one of the at least one feed line (18) for carbon dioxide of the synthesis gas production unit (12), and
• wherein the plant (10) further comprises an electrolysis unit (56) for separating water into hydrogen and oxygen, wherein the electrolysis unit (56) has a water feed line (58), an oxygen discharge line (60) and a hydrogen discharge line (62), and, wherein a line (68) leads from the oxygen discharge line (60) into the feed line for oxygen-containing gas (24) to the synthesis gas production unit (12).