METHOD OF FORMING THERMAL FIELD Russian patent published in 1999 - IPC

FIELD: methods of heating working surface of furnace by flow of hot gases. SUBSTANCE: method consists in surface heating of working space of furnace by supercharging through inlet hole and escape into exhaust box hole. Losses of power of heating device are taken into account, rate of flow of hot gases to exhaust box is checked, minimum temperature of exhaust gases is set; hot air in lower and upper parts of heating device is used; exhaust box is provided with rotary moistened filter with automatically changeable stage of protection; amount of thermal energy is reduced in proportion to time of holding hot flow and time of its circulation; time of emission of thermal flow into exhaust box is reduced due to increased area of heating; permissible excess of temperature of skin of heating device is set. EFFECT: saving of thermal energy.