热化学碘硫循环制氢流程设计与模拟

王明华; 张东青; 应芝

doi:10.16513/j.2096-2185.DE.2207604

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分布式能源 ›› 2022, Vol. 7 ›› Issue (6) : 30-36. DOI: 10.16513/j.2096-2185.DE.2207604

学术研究

热化学碘硫循环制氢流程设计与模拟

王明华 ¹ ,
张东青 ¹ ,
应芝 ²

作者信息 +

Flowsheet Design and Simulation of Thermochemical Iodine-Sulfur Cycle for Hydrogen Production

Author information +

文章历史 +

摘要

在碳达峰、碳中和目标下，氢能是能源系统脱碳转型的重要载体，而热化学碘硫循环是实现大规模、高效、绿色制氢的技术之一。前期针对碘硫循环的流程设计中，Bunsen反应和HI分解反应均采用化学计量反应器，未考虑真实Bunsen反应动力学过程以及HI分解反应平衡转化率与温度的关联。基于此，该文设计产氢量100 m³/h的热化学碘硫循环制氢系统流程，建立Bunsen反应动力学自定义Fortran模块，采用吉布斯自由能最小化原则模拟HI分解反应，计算系统质量平衡和能量平衡，并完成灵敏度分析和热效率评估。研究结果表明：Bunsen反应进程在一定时间后基本达到平衡；H₂SO₄分解率的提升有利于降低整个系统能耗；提高分解温度对提升HI平衡分解率的作用不显著；考虑系统放热量的回收利用，获得系统的理想热效率可达57.4%。该研究可为大规模碘硫循环制氢系统优化与应用提供理论依据。

Abstract

Under the goal of carbon peaking and carbon neutrality, hydrogen energy is an important carrier for the decarbonization transformation of the energy system. Thermochemical iodine-sulfur cycle is one of the technologies to achieve large-scale, efficient and green hydrogen production. In the previous process design for iodide-sulfur cycle, stoichiometric reactors were employed for both Bunsen reaction and HI decomposition reaction, without considering the real Bunsen reaction kinetic process and the relationship between equilibrium conversion rate of HI decomposition reaction and temperature. In this paper, a thermochemical iodine-sulfur cycle for hydrogen production flowsheet with hydrogen production rate of 100 m³/h was developed. A user-defined Fortran module of Bunsen reaction kinetics was established, and HI decomposition reaction was calculated using Gibbs free energy minimization principle. The mass and energy balance of the system was calculated, and sensitivity analysis and thermal efficiency evaluation were conducted. Results show that the Bunsen reaction process basically reaches equilibrium after a certain time. The increase of H₂SO₄ decomposition rate is beneficial to reduce the overall energy consumption. The effect of increasing decomposition temperature on HI equilibrium decomposition rate is not significant. The ideal thermal efficiency of IS cycle reaches 57.4% considering the recycle of the heat released by the system. This study is expected to provide theoretical reference for the optimization and application of large-scale IS cycle for hydrogen production.

导出引用

王明华, 张东青, 应芝. 热化学碘硫循环制氢流程设计与模拟[J]. 分布式能源. 2022, 7(6): 30-36 https://doi.org/10.16513/j.2096-2185.DE.2207604

Minghua WANG, Dongqing ZHANG, Zhi YING. Flowsheet Design and Simulation of Thermochemical Iodine-Sulfur Cycle for Hydrogen Production[J]. Distributed Energy Resources. 2022, 7(6): 30-36 https://doi.org/10.16513/j.2096-2185.DE.2207604

中图分类号： TK22

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