Arkansas Tech University,
Keywords: hydrogen, gas turbine, flameless combustion, solid oxide steam electrolyzer
Summary:In this paper, performance of a gas turbine (GT) system coupled with a flameless boiler for steam generation for hydrogen production in a solid oxide steam electrolyzer (SOSE) is evaluated. In this design, the GT exhaust gases are conducted to the flameless boiler in which diluted and preheated exhaust gases are applied as an oxidizer in this process. By using a small amount of fuel in the flameless boiler, the hybrid system is enabled to produce required steam for SOSE process and the whole generated electrical power by GT is employed in SOSE as well to produce hydrogen. The effects of fuel flow rate, turbine inlet temperature (TIT), steam temperature and the electrode characteristics on the performance of the hybrid system are assessed. The results indicate that in GT system, the TIT should be set at the temperatures higher than 1300K to prepare a desirable circumstance for the operation of flameless mode in the boiler. At the constant electrical power, when steam temperature increases, the overall SOSE potential decreases and consequently the current of the SOSE enhances which result in the enhancement of the overall hydrogen production in high steam temperatures. The presented analysis in this paper can be employed to perform more analyses to achieve insightful understanding of the green hydrogen production using hybrid systems.