With regard to energy mechanical engineering, it can be used in power equipment that requires a liquid metal heat medium. The mass transfer device includes a casing, and the casing includes a flow reaction chamber filled with a solid-phase granular oxidant, and a reaction chamber. With an electric heater positioned in The housing of the apparatus is provided with a spare solid-phase granular oxidant reservoir, which is made in the form of a cup located under the reaction chamber and having a bottom, and the cup is connected to the reaction chamber. The As a result, the operation period of the mass transfer device is extended. [Selection] Figure 1
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