| 摘要 |
PROBLEM TO BE SOLVED: To uniformly heat a material to be heated at a low cost by constituting a radiant tube for indirectly heating the material in an endless ring state by radiating from a surface of the tube, connecting a pair of burners at its separate positions, and alternately burning the burners. SOLUTION: A radiant tube 1 formed in an endless ring state is formed into an elliptical shape, and a pair of burners 2 (2a, 2b) are mounted at linearly symmetrical positions of the tube 1 via a connecting tubes 3a, 3b. The burners are alternately operated. When the burner 2a is burned, the burner 2b is in an exhausting state. Combustion gas from the burner 2a is guided to the tube 1 through the tube 3a, separated into clockwise and counterclockwise directions of two routes in the tube 1 from the tube 1 toward the burner 2b and distributed. Thereafter, the operating state is switched, the burner 2b is in a combustion state, the burner 2a is set to exhaust state, and the gas is distributed in a direction opposite to the above. |
