The invention relates to a method for providing a
hydrogen stream (7) in a facility (2) for providing the
hydrogen stream (7), wherein a carbon-containing
energy carrier stream (3) is fed to a
syngas reactor
assembly (4) in order to obtain a
syngas stream (5) comprising
hydrogen and carbon oxides, the
syngas reactor
assembly (4) obtains the syngas stream (5) from the
energy carrier stream (3) by means of an autothermal reforming process, the syngas stream (5) is fed to a shifting apparatus (15a-c), a water-gas shift reaction taking place in the shifting apparatus (15a-c) in order to react at least part of the
carbon monoxide of the syngas stream (5) with steam from the syngas stream (5) in order to form
carbon dioxide and hydrogen, the syngas stream (5) is fed, downstream of the shifting apparatus (15a-c), to a
carbon dioxide scrubber (30) in order to scrub at least part of the
carbon dioxide from the syngas stream (5), a
flash gas stream is released from a regeneration stage of the
carbon dioxide scrubber (30), said
flash gas stream being fed to a heating device of the facility (2) for an underfiring process, and the syngas stream (5) is at least partly fed, downstream of the
carbon dioxide scrubber (30), to a separating
assembly (6) in order to separate the syngas stream (5) at least into a hydrogen stream (7) comprising hydrogen and a
carbon oxide-containing
exhaust gas stream (8). The method is characterized in that, prior to being fed to the syngas reactor assembly (4), the
energy carrier stream (3) is fed to a saturation stage (11), in which preheated condensate (12) accumulated in the facility (2) is fed to the energy carrier stream (3), and in that during the process of feeding the syngas stream to the shifting apparatus (15a-c), at least 80% of the steam fraction of the syngas stream (5) is already present as the syngas stream (5) exits the syngas reactor assembly (4). The invention likewise relates to a corresponding facility (2) for providing a hydrogen stream (7).