Device and method for heating furnaces by means of radiant tubes

A furnace heating device, for the heat treatment of goods in a furnace chamber (16), comprising:

• at least one radiant tube (11), configured to heat the furnace chamber (16) and which can be heated using a burner (17), which can be operated in a first operating mode (F) with a flame and in a second operating mode (NF) with flameless oxidation,
• at least one control device (21), configured to control on and off states and an operating mode setting for the burner (17) of the radiant tube (11),
• wherein the at least one control device (21) is configured to fix the temperature (T) of the furnace chamber (16) to a setpoint temperature (Ts), which lies below a critical temperature (Tk), which must at least be present in a combustion chamber for flameless oxidation of the used fuel, but lies above a lower temperature (Tu), at which the burner (17) of the radiant tube (11) can be operated in a flameless manner,
• wherein the at least one control device (21) is designed to operate the burner (17) in the second operating mode (NF) at a temperature (T) of the furnace chamber (16) lying above the lower temperature (Tu) and below the critical temperature (Tk);
• wherein the control device (21) is designed to identify a warm start only if the temperature (T) of the furnace chamber (16) lies below the critical temperature limit (Tk), but above the lower temperature (Tu);
• wherein the control device (21) is designed to operate the burner (17) in the first operating mode (F) for a period of time (Δt) only in case of a warm start;
• wherein the period of time (Δt) is fixed.