Keywords: efficiency, iodine, measurements, nuclear energy, nuclear power, sulphur, thermochemistry, hydrogen production, high temperature reactors, hydrogen energy, thermodynamics, cerium–chloride
The sulphur–iodine and other thermochemical process studies at CEA
The thermochemical sulphur–iodine process is studied by CEA with the objective of massive hydrogen production using the heat coming from a high temperature reactor. A two-fold programme was set up in 2000. The main part is devoted to the study of the basic process, including optimisation of a detailed flow-sheet, thermodynamics measurements and industrial plant evaluation. In parallel, an operating flow-sheet was set-up that gives the best efficiency possible today, i.e. 35%. An innovative programme was derived that should raise the efficiency up to 50%. In parallel, international collaborations are used to develop laboratory loops to get experience from materials and components. A Bunsen section is under construction in CEA/Marcoule to be coupled later on to a sulphuric acid decomposer and a HI distiller, built in the US by SNL and GA respectively. On the other hand, several cycles are presented with a first set of analysis: the hybrid sulphur cycle, the UT_3 cycle and cerium–chloride cycle.