High-temperature high-pressure air heating furnace

The invention discloses a high-temperature high-pressure air heating furnace which comprises a steel frame and is characterized in that a heating furnace main body and an adiabatic combustion furnace are arranged on the steel frame; a combustor is arranged below the adiabatic combustion furnace; a self-use air inlet is arranged at one side of the combustor; the upper part of the adiabatic combustion furnace is fixed with the heating furnace main body; the heating furnace main body is divided into a high-temperature section high-pressure air heater, a medium-temperature section high-pressure air heater and a low-temperature section high-pressure air heater from bottom to top; working medium sides of the three heaters are communicated through an air connection pipe; the smoke sides of heating surfaces of the three heaters are communicated through a connection flue; the upper end of the low-temperature section high-pressure air heater is connected with a tube-shell type self-use air pre-heater; a chimney is fixe