KINETICS OF OXIDATION OF ALUMINUM POWDER IN WATER IN AN IDEAL STIRRED REACTOR WITH A PORTION FEEDING OF THE REAGENT

O.N. Morozova, O.B. Kudryashova, A.A. Pavlenko
 DOI: 10.25699/SSSB.2021.36.2.013 Download PDF
Abstract: The paper considers the reaction of oxidation of finely dispersed aluminum powder with water in an ideal stirred reactor. Based on the previously obtained data on the macrokinetics of the reaction of the interaction of dispersed aluminum with water, the modes of portion feeding of the powder into the reactor are theoretically considered. Solving the problem of searching for the kinetic parameters of the reaction of dispersed aluminum with water is important in connection with the development of hydrogen sources for fuel cells. The problem of optimizing the modes of hydrogen generation in the aluminum-water reaction arises in connection with the fact that the dynamics of the interaction of highly dispersed aluminum with water are extreme with a sharp increase in hydrogen pressure and a sharp decline. On the other hand, technologies that use hydrogen as a fuel require a uniform supply of gas to the fuel cell. An ideal stirred reactor containing heated water (80 ° C) is considered, into which aluminum powder is fed at some time intervals (10–270 s). The degree of conversion of aluminum and the rate of formation of hydrogen as a function of time is determined. The calculations are based on the kinetic parameters of the Alex brand powder; it is believed that the mass of water significantly exceeds stoichiometric. The dynamics of the reaction are compared for the cases of a one-time loading of the powder into the reactor and portion feeding with different time intervals. It is shown that, with portion feeding, hydrogen is generated practically in a stationary mode, and no thermal explosion occurs as a result of an exothermic reaction. The found regularities of the course of the reaction can be used in the future to calculate the technical parameters of hydrogen generation systems.
Index terms: oxidation kinetics, ideal stirred reactor, aluminum powder, portion feed of the reagent, hydrogen generation.

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