Abstract
We have developed the stand for the practical hydrogen power engineering course. This stand consists of hydrogen-air fuel cell, electronic system control, control of functional parameters and hydrogen source based on metal hydride cylinder. The specially manufactured 40 W stack is used in the stand as a fuel cell consisting of 22 membraneelectrode assemblies (MEA). We have investigated the current-voltage characteristics of the stack. Hydrogen fluxes of more than 0.7 l/min are shown to be required for the efficient operation of the fuel cell used in the stand 30 W under a current load of 3 A. We have studied the distribution of the temperature of the stack outer surface at different load currents, and establish that the maximum temperature does not exceed 45 ºC at the operating working load used in the stand. The paper describes the station hydrogen refueling metal hydride cylinders in detail. The station allows one to refuel metal-hydride cylinders with different form factors and volumes from 50 ml to 15 l. The connecting elements of the station withstand pressure drops from 0.1 Pa up to 1.5 MPa. The hydrides of La0.9Се0.1Ni5 and La 0.8 Се 0.2 Ni 5 alloys are used as a source of hydrogen. We have studied the P–C dependences cycles of hydrogen absorption and desorption for La 0.9 Ce 0.1 Ni 5 and La 0.8 Ce 0.2 Ni 5 alloys utilizing in metal hydride cylinders at temperatures of 25 ºC and 45 ºC. The paper gives a description of hydrogen filling procedure of these cylinders in detail. The developed stand allows one in real time to measure and stabilize the temperature of the fuel cell for two sensors with the edge and in the center of the fuel cell; to control the temperature of the metal hydride cylinder; to measure voltage and current on the fuel cell, and current through a connected external load irrespective of the internal electronic load of the stand; to measure the hydrogen flow. This stand can be applied to demonstrate the work of alternative energy sources, as well as for the training of personnel working in the field of energy.
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