Method and device for producing syngas

A method for producing a synthesis gas product having a desired, adjustable molar CO/H2 ratio denoted by V from a hydrocarbon-containing starting material selected from the group consisting of pyrolysis gas, pyrolysis oil, flare gas, biogas and natural gas, the method comprising steps of:

• performing a first sub-process T1 by which a first synthesis gas A is generated from a first sub-stream of the hydrocarbon-containing starting material by feeding the first sub-stream of the hydrocarbon-containing starting material directly into a first plasma reactor , the first synthesis gas A having a molar ratio of CO to H2 which is denoted by V1, the first sub-stream of the hydrocarbon-containing starting material and the hydrocarbon-containing starting material having the same composition;
• performing at least one additional sub-process selected from the group consisting of a second sub-process T2 and a third sub-process T3,
• wherein the second sub-process T2 comprises generating a second synthesis gas B from a second sub-stream of the hydrocarbon-containing starting material by feeding the second sub-stream of the hydrocarbon-containing starting material directly into a second plasma reactor, the second synthesis gas B having a molar ratio of CO to H2 denoted by V2, wherein V1 ≠V2, the first and second sub-streams of the hydrocarbon-containing starting material having the same composition, and
• wherein the third sub-process T3 comprises breaking down hydrocarbon(s) of a third sub-stream of the hydrocarbon-containing starting material into solid carbon and hydrogen by feeding the third sub-stream of the hydrocarbon-containing starting material directly into a third plasma reactor, the first and third sub-streams of the hydrocarbon-containing starting material having the same composition;
• and
• combining the first synthesis gas A generated in the first sub-process T1 with at least one of the second synthesis gas B generated in the second sub-process T2 and the hydrogen produced in the third sub-process T3 to obtain the synthesis gas product having the desired molar CO/H2 ratio V by adjusting a mixing ratio of the combined gases.