热化学碘硫循环制氢中硫酸分解器结构设计与模拟研究
摘要：摘要硫酸分解是影响热化学碘硫循环制氢效率的关键环节。通过数值模拟方法设计了一款满足1 m3/h制氢量要求的中试规模的刺刀式硫酸分解器。首先开展实验测定了Fe2O3催化剂的反应动力学参数,其中指前因子和活化能分别为1.439 × 107 s-1和125.63 kJ/mol。然后对三种结构形式的硫酸分解器进行模拟对比。结果表明,刺刀式硫酸分解器中半截面积内管形式比半直径形式具有更强的传热效果,可将分解器预热段长度缩短43.27%,达到相同分解率时催化剂用量减少23%。而结构三在半截面积内管形式的基础上向预热段填充SiC小球,进一步优化了预热段传热效果,预热段长度可缩短70.51%,并且SiC小球所引起的压降和能耗增加相对较小。对比发现,当预热段长度为870 mm、催化分解段长度为333 mm时,结构三表现出最佳的经济性能,此时SO3催化分解率达到73.73%,对应H2的理论产率为1.228 8 m3/h。当分解器外壁面加热温度降低到860 ℃时,SO3分解率降至60%,恰好对应H2的理论产率为1 m3/h。该研究可为中试规模硫酸分解器的设计提供参考。
Abstract:：The decomposition of sulfuric acid is a key step influencing the hydrogen production efficiency of the thermochemical iodine-sulfur cycle. This article designed a pilot-scale bayonet sulfuric acid decomposer that met a hydrogen yield of 1 m3/h via numerical simulation. Firstly, the reaction kinetic parameters of the Fe2O3 catalyst were experimentally determined, with the pre-exponential factor and activation energy being 1.439×107 s-1 and 125.63 kJ/mol, respectively. Then, a comparative simulation was conducted on the decomposers of three structural forms. The results showed that the "half-area" inner tube had a stronger heat transfer effect than the "half-diameter" inner tube in the decomposer, reducing the length of the preheating section by 43.27% and decreasing the catalyst usage by 23% to achieve the same decomposition rate. The third structure further optimized the heat transfer effect of the preheating section by filling SiC balls into the preheating section based on the "half-area" form, reducing the length of the preheating section by 70.51%. The increase in pressure drop and energy consumption caused by the SiC balls were marginal. Furthermore, the third structure had optimal cost-effective performance when the preheating and catalytic section lengths were respectively 870 mm and 333 mm, while the SO3 decomposition rate reached 73.73%, corresponding to a theoretical H2 yield of 1.228 8 m3/h. When the heating temperature of the decomposer's outer wall decreased to 860 °C, the SO3 decomposition rate dropped to 60%, exactly corresponding to a H2 yield of 1 m3/h. This study provides a reference for the design of a pilot-scale sulfuric acid decomposer.
中文标题：热化学碘硫循环制氢中硫酸分解器结构设计与模拟研究
英文标题：Structural Design and Numerical Investigation of the Sulfuric Acid Decomposer in the Thermochemical Iodine-Sulfur Cycle for Hydrogen Production
发表时间：2024-02-04
作者：
别亦然, 何勇, 李明阳, 翁武斌, 王智化
作者简介：
别亦然（2000-）,男,硕士研究生,主要从事热化学碘硫循环制氢技术研究。王智化（1977-）,男,博士,教授,主要从事污染物治理、激光燃烧诊断、新能源制氢方面的研究。
关键词：制氢,碘硫循环,硫酸分解器,数值模拟,结构设计,
Key words：hydrogen production,iodine-sulfur cycle,sulfuric acid decomposer,numerical simulation,structural design,
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