A Study on Pill Temperature Control method and Hydrogen Production with 2-step Thermochemical Cycle Using Dish Type Solar Thermal System

Title & Authors
A Study on Pill Temperature Control method and Hydrogen Production with 2-step Thermochemical Cycle Using Dish Type Solar Thermal System
Kim, Chul-Sook; Kim, Dong-Yeon; Cho, Ji-Hyun; Seo, Tae-Beom;

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 $\small{1100^{\circ}C}$ and $\small{1400^{\circ}C}$, 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 Pill 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.
Keywords
2-Step Thermochemical Reaction;Solar Thermal;Hydrogen Production;Proportional Integral Derivative Control;
Language
Korean
Cited by
References
1.
Korea Energy Economics Institute, Hydrogen Production Cost Estimation Research Report, KEEI, 2007. 12.

2.
Aldo Steinfeld, Solar the rmochemical production of hydrogen-a review, Solar Energy, Vol. 78, 2005, pp. 603-615.

3.
J. W. Kim, C. S. Park, G. J. Hwang, K. K. Bae, Thermochemical Cycles for Hydrogen Production from Water., J. of Energy Engineering, Vol. 15, No. 2, 2006, pp. 107-117.

4.
S. Moller et al., Solar thermal decomposition kinetics of ZnO in the temperature range 1950-2400K., Chem Eng. Sci, Vol. 56, 2001, pp. 4505-4515.

5.
Steinfeld A., Solar hydrogen-production via two-step water splitting thermochemical cycle based on Zn/ZnO redox reactions., Int. J. Hydrogen Energy , Vol. 27, 2002, pp. 611-619.

6.
Sibieude F. et al., High-temperature experiments with a solar furnace the decomposition of Fe3O4, Mn3O4, CdO, Int J. of Hydrogen Energy , Vol. 7, 1982, pp. 79-88.

7.
Nobuyuki Gokonetal., Thermochemical two-step water splitting cycles by monoclinic ZrO2-supported NiFe2O4 and Fe3O4 powders and ceramic foam devices, Solar Energy , Vol. 83, 2009, pp. 527-537.

8.
Patrice Charvin et al., Two-step water splitting thermochemical cycle based on iron oxide redox pair for solar hydrogen production, Energy , Vol. 32, 2007, pp. 1124-1133.

9.
S. Molleretal., The Development of a Solar Chemical Reactor for the Direct Thermal Dissociation of Zinc Oxide, Journal of Solar Energy Engineering, Vol. 123, 2001, pp. 83-90.

10.
Araki M., PID Control, Control Systems, Robotics, and Automotive, Vol. II, 2002, EOLSS