热化学碘硫循环制氢中硫酸分解器结构设计与模拟研究  

Structural Design and Numerical Investigation of the Sulfuric Acid Decomposer in the Thermochemical Iodine-Sulfur Cycle for Hydrogen Production

作　　者：别亦然 何勇[1] 李明阳[1,2] 翁武斌 王智化 BIE Yiran;HE Yong;LI Mingyang;WENG Wubin;WANG Zhihua(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;Dongfang Electric Co.Ltd.,Chengdu 611731,China)

机构地区：[1]浙江大学,能源高效清洁利用全国重点实验室,杭州310027 [2]东方电气股份有限公司,成都611731

出　　处：《新能源进展》2024年第3期249-259,共11页Advances in New and Renewable Energy

基　　金：中央高校基本科研业务费专项资金资助项目(2022ZFJH04)。

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 m^(3)/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Fe_(2)O_(3)催化剂的反应动力学参数,其中指前因子和活化能分别为1.439×10^(7)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SO_(3)催化分解率达到73.73%,对应H_(2)的理论产率为1.2288 m^(3)/h。当分解器外壁面加热温度降低到860℃时,SO_(3)分解率降至60%,恰好对应H2的理论产率为1 m^(3)/h。该研究可为中试规模硫酸分解器的设计提供参考。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 m^(3)/h via numerical simulation.Firstly,the reaction kinetic parameters of the Fe_(2)O_(3) catalyst were experimentally determined,with the pre-exponential factor and activation energy being 1.439×10^(7) 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 SO_(3) decomposition rate reached 73.73%,corresponding to a theoretical H_(2) yield of 1.2288 m^(3)/h.When the heating temperature of the decomposer's outer wall decreased to 860°C,the SO_(3) decomposition rate dropped to 60%,exactly corresponding to a H_(2) yield of 1 m^(3)/h.This study provides a reference for the design of a pilot-scale sulfuric acid decomposer.

关 键 词：制氢 碘硫循环 硫酸分解器 数值模拟 结构设计 

分 类 号：TK91[动力工程及工程热物理]