硫碘循环制氢系统电解电渗析模块的模拟设计及关键参数对系统的影响

Simulation Design of Electro-Electrodialysis and Influence of the Key Parameters on the S-I Cycle Hydrogen Production System

硫碘循环制氢是一种以二氧化硫和碘为中间介质使得水分解的制氢方法,由本生(Bunsen)反应、H2SO4相和HIx相3个工段组成。HIx相工段需使用电解电渗析法(Electro-electrodialysis, EED)提纯HI溶液。基于Aspen Plus建立了硫碘循环制氢模拟模型,并将其与基于MATLAB的EED数学模型耦合运行,分析EED阴阳极入口不同的物流配比时EED的参数设置、氢气和循环物料摩尔流率的变化规律;确定了反应工段(BUN工段)产物和HI精馏塔塔底物流流入EED阴极的最佳比例范围分别为0.6~0.7和0.5~0.7。研究结果可指导硫碘循环制氢系统的设计和优化。

S-I cycle hydrogen production system is a hydrogen production method with SO2 and I2 as the intermediate to promote the decomposition of water into hydrogen and oxygen.It consists of three sections:Bunsen reaction section,H2SO4 phase section,and HIx phase section.In the HIx phase section,the electro-electrodialysis(EED)module is used to purify the HI solution.The hydrogen production simulation model is built in Aspen Plus.Besides,it is combined with the mathematical model of the EED module built on the basis of MATLAB.The parameters of EED,xCABUN xCABTMunder different stream allocated mole ratios to the inlet of cathode and anode(and),are analyzed and can be used to design an EED module.Based on this model,the variations of the mole flow rate of hydrogen and recycle xCABUN xCABTM xCABUNmaterial and some crucial parameters along with and are discussed.The optimal intervals of and xCABTM are 0.6—0.7 and 0.5—0.7,respectively.The results can be used to guide the design and optimization of the S-I hydrogen production system.