Beschreibung:
Hydrogen as a future energy carrier can be used for grid power peak shaving and valley filling and has thus attracted widespread attention. However, how to provide high-temperature heat for water electrolysis is an urgent challenge that needs to be overcome. This paper adopts two gas-solid reactions to replace the direct combustion process of fuel and air. As a result, the gas turbine works at the external combustion mode, and its thermodynamic parameters would not be affected in hydrogen production. Meanwhile, cascade utilization of methane realizes the improvement of low-grade heat. Furthermore, the energy conversion is studied based on a cogeneration system, and the results show that the energy level of solar heat of 650˚C and latent heat of 100˚C can be enhanced from 0.68 to 0.76, and 0.20 to 0.83, respectively. The power-/heat-to-hydrogen efficiency can reach about 0.95. In addition, when the hydrogen is produced, the input work of the compressor and the output work of the turbine are maintained at 245.4kW and 448.0kW, respectively. Besides, the relative fluctuations of cooling and heating outputs and component efficiency are controlled within 0.1 and 0.007, respectively. Finally, the results could be extended to efficiently store intermittent renewable electricity in the future