Abstract
In this study, an optimal design was proposed for the pressure drop of a high-temperature steam generator to enhance hydrogen production in a solid oxide electrolyzer cell (SOEC). The high-temperature steam generator (HTSG) was analyzed under experimental conditions of a steam temperature of 773 K, steam inlet pressure of 300–600 kPa, and steam flow rate of 10–35 kg/h. The pressure drop characteristics of the HTSG were analyzed under various variable conditions via a computational fluid dynamics simulation. The pressure drop according to the variable change was ranged from a minimum of 54 kPa (inlet nozzle angle: 25°) to a maximum of 309 kPa (body ratio: 0.63), and the valid range was 28,700 < Re < 306,600 . The hydrogen production capacity that can be produced utilizing the optimally designed HTSG was predicted to be up to 35.7 tons annually. In addition, CO2 emissions during hydrogen production under optimal conditions are 9.92 ton-CO2/ton-hydrogen, which can be reduced by up to 86.8% compared to the conventional high-temperature and high-pressure (HTHP) steam, thereby enhancing hydrogen production and energy harvesting.
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