Abstract
The magnesium-iodine cycle, consisting of the redox reaction of iodine with magnesium oxide, the thermal decomposition of magnesium iodate, the hydrolysis of magnesium iodide and the thermal decomposition of hydrogen iodide, for thermochemical hydrogen production has been evaluated. The thermal efficiency of the process was calculated based on material and energy balances for three proposed flow-sheets. The three flow-sheets varied according to the method used (quenching, selective absorption of HI by magnesium oxide and the two-step chemical decomposition of HI by magnetite) to separate the products of hydrogen iodide decomposition. Values of 9–34% thermal efficiency were given as a function of the heat recovery of 65–85% for the quench method, 19–37% for the MgO method and 16–35% for the Fe 3O 4 method. In order to obtain more than 25–30% of the thermal efficiency, heat recovery must be more than 80%.
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