The concept of cogeneration of power and hydrogen plants is introduced with speci/c regard to the fossil fuels. Fossil fuels require steam to be converted to hydrogen, while powerplants usually discharge heat by condensing steam. Moreover, hydrogen can be burned with oxygen to produce steam and to generate power in high-temperature steam cycles. These considerations suggest that an integration of the processes could result in a very high e6ciency of conversion . It could allow to start immediately to convert e6ciently fossil fuels to power and clean hydrogen. Some theoretical evaluations are carried out which show that an improvement of e6ciency could be reached with respect to separate plants. However, it is necessary to investigate each speci/c case in order to evaluate the real advantage obtained.
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