固体氧化物电解水制氢系统效率

Efficiency of solid oxide water electrolysis system for hydrogen production

电解水与高效清洁一次能源耦合制氢,是理想的大规模制氢技术。该文建立了电解水制氢系统效率评估模型,并通过该模型对碱性、固体聚合物电解池(SPE)及固体氧化物电解池(SOEC)制氢系统总制氢效率进行了计算与分析。碱性制氢系统电解效率与总制氢效率均较低,分别为56%和25%;SPE制氢系统电解效率虽有提高约76%,但其总制氢效率仍较低约35%;而SOEC制氢系统电解效率可达90%以上,总制氢效率高达55%,分别是SPE与碱性制氢系统的1.5和2倍。高温气冷堆耦合的SOEC电解制氢系统是目前已知总制氢效率最高的大规模制氢系统。

Water electrolysis coupled with an efficient and clean primary energy source is an ideal large-scale hydrogen production technology. A model was developed to predict the efficiency of a water electrolysis system for hydrogen production based on the overall efficiency of an alkaline electrolysis system, a solid polymer electrolyte （SPE） system, and a solid oxide electrolysis cell （SOEC） system. The results show that both the electrolysis efficiency, 56%, and the overall efficiency, 25%, are very low. The electrolysis efficiency, 76%, of the SPE system is improved, the overall efficiency, 35%, is still low. However, the electrolysis efficiency of the SOEC is more than 90% and the overall efficiency is over 55%, both are much higher than the other systems. The overall efficiency of a high-temperature gas-cooled reactor coupled with an SOEC system is the highest among all existing water electrolysis systems.