Characteristic Studies of Micron Zinc Particle Hydrolysis in a Fixed Bed Reactor

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Abstract

Zinc fuel is considered as a kind of promising energy sources for marine propeller. As one of the key steps for zinc marine energy power system, zinc hydrolysis process had been studied experimentally in a fixed bed reactor. In this study, we focus on the characteristics of micron zinc particle hydrolysis. The experimental results suggested that the steam inner diffusion is the controlling step of accumulative zinc particles hydrolysis reaction at a relative lower temperature and a relative higher water partial pressure. In other conditions, the chemical reaction kinetics was the controlling step. And two kinds of chemical reaction kinetics appeared in experiments: the surface reaction and the gas-gas reaction. The latter one occurs usually for larger zinc particles and high reaction temperature. Temperature seems to be one of the most important parameters for the dividing of different reaction mechanisms. Several parameters of the hydrolysis process including heating rate, water partial pressure, the particle size and temperature were also studied in this paper. Results show that the initial reaction temperature of zinc hydrolysis in fixed bed is about 410°C. And the initial reaction temperature increases as the heating rate increases and as the water partial pressure decreases. The total hydrogen yield increases as the heating rate decreases, as the water partial pressure increases, as the zinc particle size decreases, and as the reaction temperature increases. A hydrogen yield of more than 81.5% was obtained in the fixed bed experiments.

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  • 1. Committee on Technology for Future Naval Forces Commission on Physical Sciences Mathematics and Applications National Research Council.: Technology for the United States Navy and Marine Corps 2000-2035 Volumn 2 National academy press Washington D.C 1997.

  • 2. Steinfeld A. Kuhn P. Reller A. Palumbo R. Murray J. Tamaura Y.: Solar-processed metals as clean energy carriers and water-splitters. International Journal of Hydrogen Energy 1998.

  • 3. Weidenkaff A. Reller A.W. Wokaun A. Steinfeld A. : Thermogravimetric analysis of the ZnO/Zn water splitting cycle Thermochimica Acta 2000.

  • 4. Lv M. Zhou J.H. Zhou Z.J. Yang W.J. Liu J.Z. Cen K.F. : A novel system of near zero emission clean coal energy utilization based on Zn/ ZnO. Journal of Power Engineering 2008.

  • 5. Ernst F.O. Steinfeld A. Pratsinis S.E.: Hydrolysis rate of submicron Zn particles for solar H2 synthesis International Journal of Hydrogen Energy2009.

  • 6. Berman A. Epstein M.: The kinetics of hydrogen production in the oxidation of liquid zinc with water vapor. International Journal of Hydrogen Energy 2000.

  • 7. Wegner K. Ly H.C. Weiss R.J. Pratsinis S.E. Steinfeld A.: In situ formation and hydrolysis of Zn nanoparticles for H2 production by the 2-step ZnO/Zn water-splitting thermochemical cycle. International Journal of Hydrogen Energy 2006.

  • 8. Melchior T. Piatkowski N. Steinfeld A.: H2 production by steam-quenching of Zn vapor in a hot-wall aerosol flow reactor Chemical Engineering Science 2009.

  • 9. Vishnevetsky I. Epstein M.: Production of hydrogen from solar zinc in steam atmosphere International Journal of Hydrogen Energy 2007.

  • 10. Lv M. Zhou J.H. Yang W.J. Cen K.F.: Thermogravimetric analysis of the hydrolysis of zinc particles International Journal of Hydrogen energy 2010.

  • 11. Ma X. Zachariah M.R.: Size-resolved kinetics of Zn nanocrystal hydrolysis for hydrogen generation. International Journal of Hydrogen Energy 2010.

  • 12. Bhaduria B. Verma N.: A zinc nanoparticles-dispersed multi-scale web of carbonmicro-nanofibers for hydrogen production step of ZnO/Znwater splitting thermochemical cycle Chemical Engineering Research and Design2014.

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