Abstract In this paper, design and performance analysis of a biogas (60%CH4 + 40%CO2) fueled gas turbine (GT) power generation system integrated with a flameless boiler for steam generation for hydrogen production in a solid oxide steam electrolyzer (SOSE) is reported. In this design, the exhaust gases from GT is conducted to a flameless boiler where diluted and preheated exhaust gases are employed as an oxidizer in this process. Using a small amount of biogas in the flameless boiler enables the hybrid system 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 biogas blends and flowrate, turbine inlet temperature (TIT), steam temperature and the electrode characteristics on the performance of the hybrid system are evaluated. The results indicate that by purification of biogas and increasing CH4 concentration up to 80%, the generated electrical power and produced hydrogen of the hybrid system augment 24% and 20% respectively. In GT system, the TIT should be set at the temperatures higher than 1300 K 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. To increase the steam temperature from 850 K to 1450 K, the rate of overall biogas consumption of the system increases 1% while the amount of overall hydrogen production from SOSE system augments from 0.01 to 0.052 mol/s. 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.

中文翻译：

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集成燃气轮机系统和固体氧化物蒸汽电解槽的沼气可再生制氢设计与分析

摘要 在本文中，沼气 (60%CH4 + 40%CO2) 燃料燃气轮机 (GT) 发电系统的设计和性能分析与无焰锅炉集成，用于在固体氧化物蒸汽电解槽 (SOSE) 中产生蒸汽以制氢被报道。在此设计中，来自 GT 的废气被引导至无焰锅炉，在该锅炉中，稀释和预热的废气用作此过程中的氧化剂。在无焰锅炉中使用少量沼气使混合系统能够产生 SOSE 过程所需的蒸汽，并且 GT 产生的全部电能也用于 SOSE 生产氢气。评估了沼气混合物和流速、涡轮入口温度 (TIT)、蒸汽温度和电极特性对混合系统性能的影响。结果表明，通过净化沼气和将 CH4 浓度提高到 80%，混合系统的发电量和氢气分别增加了 24% 和 20%。在 GT 系统中，TIT 应设置在高于 1300 K 的温度，以便为锅炉无焰模式运行准备一个理想的环境。在恒定的电功率下，当蒸汽温度升高时，整体 SOSE 电位降低，因此 SOSE 电流增加，这导致在高蒸汽温度下整体氢气产量的提高。为了将蒸汽温度从 850 K 提高到 1450 K，系统的总沼气消耗率增加 1%，而 SOSE 系统的总产氢量从 0.01 增加到 0.052 mol/s。