Research On The Influence Of External Magnetic Field On The Electrolytic Efficiency Of Oxy-hydrogen Generator

Hydrogen is a clean energy because it does not generate greenhouse gases and other harmful gases in the combustion process. Therefore, hydrogen energy is considered to be a permanent solution to the fossil fuel crisis and the problem of global environmental and greenhouse effect simultaneously. Hydrogen production via electrolysis of water from alkaline aqueous electrolytes has become a well-established technology. However, because of the high energy consumption owning to the low electrolytic efficiency in most industrial electrolysers, the cost of hydrogen produced in such a way is high. This is a significant limiting factor for the use of this method on a large scale.This paper establishes the mathematical model of electrolytic efficiency and overpotential by analysing the relationship between the parameters of electrolyser and electrolytic efficiency, which can guide the direction of optimal design of electrolyser. This paper analyses the Lorentz force caused by the external magnetic field, which can cause the electrolyte to generate forced convection phenomenon, namely, magnetohydrodynamics effect, which can have an influence on the overpotential and electrolytic efficiency according to the established mathematical model.This paper establishes the MHD equation of the electrolyte in the presence of external magnet field and used the Fluent software to do the coupling analysis of electric field, magnetic field and flow field by establishing analytic model of electrolyte in the presence of external magnet field. The relationship between flow field and operating current, the flow field and the thickness of the magnet is obtained eventually.By building the experimental apparatus and designing the experimental scheme, this paper conducts experimental investigation of the electrolytic efficiency under different electrode spacing and electrolyte concentration and in the presence of magnet filed of different direction and magnet flux density.Finally, according to the conclusion of the research, a on-board oxy-hydrogen generator is designed and manufactured, which consists of electrolyser system, power system and control system. Two pieces of suitable magnet is installed in the proper position of the the electrolyser. The accomplished control system achieves real-time monitoring of the on-board control system, which can ensure the generator to operate safely and reliably.