Abstract
Solar thermal reactor was studied for hydrogen production with a two step thermochemical cycle including T-R(Thermal Reduction)step and W-D(Water Decomposition) step. NiFe2O4 and Fe3O4 supported by monoclinic ZrO2 were used as a catalyst device and Ni powder was used for decreasing the T-R step reaction temperature. Maintaining a temperature level of about 1100℃ and 1400℃, for 2-step thermochemical reaction, is important for obtaining maximum performance of hydrogen production. The controller was designed for adjusting high temperature solar thermal energy heating the foam-device coated with nickel?ferrite powder. A PID temperature control system was designed based on 2-step thermochemical reaction experiment data (measured concentrated solar radiation and the temperature of foam device during experiment). The cycle repeated 5 times, ferrite conversion rate are 4.49∼29.97% and hydrogen production rate is 0.19∼1.54mmol/g-ferrite. A temperature controller was designed for increasing the number of reaction cycles related with the amount of produced hydrogen.
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