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.
标题：热化学碘硫循环制氢流程设计与模拟
title:Flowsheet Design and Simulation of Thermochemical Iodine-Sulfur Cycle for Hydrogen Production
