(93d) Efficient Hydrogen Production from Solar Thermal Energy Via High Temperature Water Electrolysis
- Conference: AIChE Annual Meeting
- Year: 2018
- Proceeding: 2018 AIChE Annual Meeting
- Group: Topical Conference: Innovations of Green Process Engineering for Sustainable Energy and Environment
Monday, October 29, 2018 - 9:15am-9:40am
Here we introduce a process design strategy for the production of hydrogen by high temperature water electrolysis using concentrated solar thermal energy. High temperature water electrolysis is realized by using solid oxide electrolysis cell (SOEC). SOEC requires both electricity and heat input to enable the energy balance of the water splitting process. We utilize solar thermal power production cycle to supply the electricity the SOEC requires. Meanwhile, water is heated by concentrated solar energy to reach the SOEC operation temperature before electrolysis. The power generating and hydrogen production processes are integrated, allowing electricity flow and heat transfer between the two cycles. Process simulations for the proposed integration are performed in an integrated Matlab and Aspen Plus platform.
Considering the electricity and power input as well as the overpotential of the SOEC, different operation modes of SOEC, including thermoneutral, endothermic and exothermic operations, could largely affect the efficiency of hydrogen production. Therefore, different operation modes of SOEC are investigated and various process designs are examined accordingly to figure out the most efficient process under various circumstances. In this way the most promising solar thermal hydrogen production process could be designed and flexibility of operation conditions could also be identified.