Abstract
Ceramic evaporator of concentrated sulphuric acid of over 90% for thermo chemical Iodine-Sulphuric(IS) hydrogen and oxygen production plant coupled with 200MWt High Temperature Gas cooled reactor was designed. This IS plant of hydrogen was designed to product 25000 Nm3/h hydrogen ant 63MW heat energy is to be loaded to evaporator to produce 1950 kmol/h sulphuric vapor at 759K under 2MPa. However, this evaporator is exposed to sulphuric acid at high temperature and pressure and material choice for this design is very limited. From the erosion test result of refractory metals and ceramics under high temperature and pressure in concentrated sulphuric acid, SiC and Si3N4 exhibit good acid proof behavior. Therefore these ceramics was selected for he evaporator and R&D including large scale ceramic tube fabrication test and ceramic/ceramic bonding test has been carried out. This paper present recent R&D results of the ceramic evaporator.
