FIELD: machine building.
SUBSTANCE: proposed apparatus comprises steam generator and steam heater to produce superheated steam and heat steam in heating chamber via circulation. Heated product F is processed by heated steam fed into said chamber. Proposed apparatus exploits the following stages: first heat treatment stage whereat said product F is subjected to heat treatment in feeding electric power to steam generator higher than that fed to steam heater, and second heat treatment stage whereat heated product F is subjected to heat treatment in feeding electric power to steam generator lower than that fed to steam heater. When product temperature exceeds fat melting zone but is lower than or equal to 100°C, said first stage changes over to second stage.
EFFECT: higher efficiency.
13 cl, 14 dwg, 1 tbl
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