RADIANT TUBE BURNER

PROBLEM TO BE SOLVED: To prevent a short path of a fuel to homogenize the temperature distribution on a surface of a heat-resistant tube and reduce the unburned content of the fuel, in a radiant tube burner.SOLUTION: A radiant tube burner 1 comprises: a bottomed cylindrical heat-resistant tube 2 for forming a combustion zone R1 on a side of a closed end 2a and a vent area R2 on a side of an open end 2b; an inner burner 3 for feeding a fuel from the side of the vent area R2 to the inside of the combustion zone R1; a plurality of ventilation passages 8 formed in the vent area R2 and accommodating a heat reservoir 11 therein; and gas supply-exhaust means 5 for supplying an oxidizer gas from one ventilation passage 8 to the inside of the combustion zone R1 and for discharging the combustion gas produced in the combustion zone R1 from another ventilation passage 8. The inner burner 3 is arranged between one ventilation passage 8 and another ventilation passage 8 and arranged in a state to protrude toward a side of the combustion zone R1, and a fuel supply port 3a is arranged in the combustion zone R1.