Khovavko A. Development of thermophysics and technological essentials of hydrogen recirculation and regeneration at iron powders reduction

Thesis for a Candidate of Technical sciences degree on speciality 05.16.02 "Technical thermophysics and industry heat power engineering" - Gas Institute of National Academy of Sciences of Ukraine, Kyiv, 2007. The thesis is devoted to developing of energysave technology of carbonless iron powder obtaining by two-stages method of martite superconcentrate reducing by electrolytic hydrogen. Gas supplying original system of the furnaces is offered with application of recirculation branch. An experimental plant on kinetics reducing researches and methods of planning experiment are perfected. The field of process management optimum factors is determined on the base of reducing and annealing kinetics in combination with methods of planning experiment. Recirculation model of reducing process is represented. Optimum hydrodynamic mode in furnace is calculated from point of view of maximum mass exchange. Energysave effect for offered scheme is counted. Localization of furnace atmosphere is offered to prevent leakages of expensive hydrogen. Geometrical parameters of powder locks that allow to maintain necessary furnace pressure and to prevent powder oxidising are calculated.