This study developed a thermodynamic model of a set of sulfuric acid decomposers for thermochemical hydrogen production. It was integrated with a 1 MW tubular-type solid oxide fuel cell (SOFC) stack. With the model, we evaluated the feasibility of the combined production of electric power, heat, and sulfur dioxide for thermochemical H₂ production. The integrated reactor model consists of three parts: i) SOFC submodel, ii) sulfuric acid decomposition (SAD) submodel, and iii) sulfur trioxide decomposition (STD) submodel with the catalysts Pt/γAl₂O₃ and WX-1. The efficiency of the integrated system was evaluated at a low-pressure range by polarization and efficiency curves for the SOFC, as well as pinch analysis for the SAD. The highest SOFC efficiency and SO₂ production were achieved at 1.25 bar, whereas the lowest fuel consumption and heat demand for SO₂ production were achieved at 3.0 bar. Furthermore, WX-1 performed better in the high-temperature range, whereas Pt/γAl₂O₃ performed better than WX-1 under low-temperature conditions. The Pt-supported catalyst could achieve SO₃ conversion of 66% and SO₂ yield of 57% at a gas temperature of 1025 K using the proposed integrated reactor design.

本研究开发了一套用于热化学制氢的硫酸分解剂的热力学模型。它与 1 MW 管式固体氧化物燃料电池 (SOFC) 堆集成在一起。通过该模型，我们评估了电力、热力和二氧化硫联合生产热化学制H ₂的可行性。集成反应器模型由三部分组成：i) SOFC 子模型，ii) 硫酸分解 (SAD) 子模型，以及 iii) 使用催化剂 Pt/γAl ₂ O ₃和 WX-1 的三氧化硫分解 (STD) 子模型。通过 SOFC 的极化和效率曲线以及 SAD 的夹点分析，在低压范围内评估了集成系统的效率。最高的 SOFC 效率和 SO₂生产在 1.25 bar 下实现，而 SO ₂生产的最低燃料消耗和热量需求在 3.0 bar 下实现。此外，WX-1 在高温范围内表现更好，而 Pt/γAl ₂ O ₃在低温条件下表现优于 WX-1。使用建议的集成反应器设计，Pt 负载的催化剂在 1025 K 的气体温度下可以实现66% 的SO ₃转化率和 57% 的SO ₂产率。