Method for producing hydrogen and power from a synthesis gas

A process for generation of hydrogen and energy from synthesis gas which contains at least CO, H2 and H2S, with the following procedure being performed:

• the synthesis gas stream is split up into two part streams;
• steam is added first to one of the synthesis gas part streams and the part stream then undergoes a CO conversion at a temperature ranging from 220° C. to 500° C.;
• a pressure swing adsorption unit (PSA) is subsequently used to produce high-purity hydrogen from the converted synthesis gas, a PSA residual gas being obtained, too;
• from the other synthesis gas part stream, H2S and further sulphurous components are separated in one or several separation devices, and
• the so desulphurized stream is fed to a gas turbine for being burned and for generating energy, with the desulphurization arranged at any point of the process, but in any case upstream of the gas turbine inlet;
• characterized in that
• the PSA residual gas is mixed with nitrogen to form a gas mixture;
• the gas mixture obtained is subsequently compressed;
• the compressed gas mixture is added to the synthesis gas part stream upstream of the gas turbine to the synthesis gas part stream branched off before and then fed to the gas turbine;
• and wherein
• the gas mixture of nitrogen and the PSA residual gas to the gas turbine has a flow rate which is controlled by a mixer such that in a given load range, the gas turbine is operated in a working range favorable to ensure minimum NOx formation.